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pigweed / third_party / github / zephyrproject-rtos / zephyr / 4540c833a8faaf5285d5620a7c29dc1dc7b560db / . / drivers / adc / adc_ads114s0x.c
blob: eeafd0d3aef39e9fb9f81cb3e04528077be66b8f [file] [log] [blame]
/*
* Copyright (c) 2023 SILA Embedded Solutions GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/adc.h>
#include <zephyr/drivers/adc/ads114s0x.h>
#include <zephyr/drivers/spi.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/logging/log.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/__assert.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/sys/util.h>
#define ADC_CONTEXT_USES_KERNEL_TIMER 1
#include "adc_context.h"
LOG_MODULE_REGISTER(ads114s0x, CONFIG_ADC_LOG_LEVEL);
#define ADS114S0X_CLK_FREQ_IN_KHZ 4096
#define ADS114S0X_RESET_LOW_TIME_IN_CLOCK_CYCLES 4
#define ADS114S0X_START_SYNC_PULSE_DURATION_IN_CLOCK_CYCLES 4
#define ADS114S0X_SETUP_TIME_IN_CLOCK_CYCLES 32
#define ADS114S0X_INPUT_SELECTION_AINCOM 12
#define ADS114S0X_RESOLUTION 16
#define ADS114S0X_REF_INTERNAL 2500
#define ADS114S0X_GPIO_MAX 3
#define ADS114S0X_POWER_ON_RESET_TIME_IN_US 2200
/* Not mentioned in the datasheet, but instead determined experimentally. */
#define ADS114S0X_RESET_DELAY_TIME_SAFETY_MARGIN_IN_US 1000
#define ADS114S0X_RESET_DELAY_TIME_IN_US \
(4096 * 1000 / ADS114S0X_CLK_FREQ_IN_KHZ + ADS114S0X_RESET_DELAY_TIME_SAFETY_MARGIN_IN_US)
#define ADS114S0X_RESET_LOW_TIME_IN_US \
(ADS114S0X_RESET_LOW_TIME_IN_CLOCK_CYCLES * 1000 / ADS114S0X_CLK_FREQ_IN_KHZ)
#define ADS114S0X_START_SYNC_PULSE_DURATION_IN_US \
(ADS114S0X_START_SYNC_PULSE_DURATION_IN_CLOCK_CYCLES * 1000 / ADS114S0X_CLK_FREQ_IN_KHZ)
#define ADS114S0X_SETUP_TIME_IN_US \
(ADS114S0X_SETUP_TIME_IN_CLOCK_CYCLES * 1000 / ADS114S0X_CLK_FREQ_IN_KHZ)
enum ads114s0x_command {
ADS114S0X_COMMAND_NOP = 0x00,
ADS114S0X_COMMAND_WAKEUP = 0x02,
ADS114S0X_COMMAND_POWERDOWN = 0x04,
ADS114S0X_COMMAND_RESET = 0x06,
ADS114S0X_COMMAND_START = 0x08,
ADS114S0X_COMMAND_STOP = 0x0A,
ADS114S0X_COMMAND_SYOCAL = 0x16,
ADS114S0X_COMMAND_SYGCAL = 0x17,
ADS114S0X_COMMAND_SFOCAL = 0x19,
ADS114S0X_COMMAND_RDATA = 0x12,
ADS114S0X_COMMAND_RREG = 0x20,
ADS114S0X_COMMAND_WREG = 0x40,
};
enum ads114s0x_register {
ADS114S0X_REGISTER_ID = 0x00,
ADS114S0X_REGISTER_STATUS = 0x01,
ADS114S0X_REGISTER_INPMUX = 0x02,
ADS114S0X_REGISTER_PGA = 0x03,
ADS114S0X_REGISTER_DATARATE = 0x04,
ADS114S0X_REGISTER_REF = 0x05,
ADS114S0X_REGISTER_IDACMAG = 0x06,
ADS114S0X_REGISTER_IDACMUX = 0x07,
ADS114S0X_REGISTER_VBIAS = 0x08,
ADS114S0X_REGISTER_SYS = 0x09,
ADS114S0X_REGISTER_OFCAL0 = 0x0B,
ADS114S0X_REGISTER_OFCAL1 = 0x0C,
ADS114S0X_REGISTER_FSCAL0 = 0x0E,
ADS114S0X_REGISTER_FSCAL1 = 0x0F,
ADS114S0X_REGISTER_GPIODAT = 0x10,
ADS114S0X_REGISTER_GPIOCON = 0x11,
};
#define ADS114S0X_REGISTER_GET_VALUE(value, pos, length) \
FIELD_GET(GENMASK(pos + length - 1, pos), value)
#define ADS114S0X_REGISTER_SET_VALUE(target, value, pos, length) \
target &= ~GENMASK(pos + length - 1, pos); \
target |= FIELD_PREP(GENMASK(pos + length - 1, pos), value)
#define ADS114S0X_REGISTER_ID_DEV_ID_LENGTH 3
#define ADS114S0X_REGISTER_ID_DEV_ID_POS 0
#define ADS114S0X_REGISTER_ID_DEV_ID_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_ID_DEV_ID_POS, \
ADS114S0X_REGISTER_ID_DEV_ID_LENGTH)
#define ADS114S0X_REGISTER_ID_DEV_ID_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_ID_DEV_ID_POS, \
ADS114S0X_REGISTER_ID_DEV_ID_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_POR_LENGTH 1
#define ADS114S0X_REGISTER_STATUS_FL_POR_POS 7
#define ADS114S0X_REGISTER_STATUS_FL_POR_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_STATUS_FL_POR_POS, \
ADS114S0X_REGISTER_STATUS_FL_POR_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_POR_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_STATUS_FL_POR_POS, \
ADS114S0X_REGISTER_STATUS_FL_POR_LENGTH)
#define ADS114S0X_REGISTER_STATUS_NOT_RDY_LENGTH 1
#define ADS114S0X_REGISTER_STATUS_NOT_RDY_POS 6
#define ADS114S0X_REGISTER_STATUS_NOT_RDY_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_STATUS_NOT_RDY_POS, \
ADS114S0X_REGISTER_STATUS_NOT_RDY_LENGTH)
#define ADS114S0X_REGISTER_STATUS_NOT_RDY_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_STATUS_NOT_RDY_POS, \
ADS114S0X_REGISTER_STATUS_NOT_RDY_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_P_RAILP_LENGTH 1
#define ADS114S0X_REGISTER_STATUS_FL_P_RAILP_POS 5
#define ADS114S0X_REGISTER_STATUS_FL_P_RAILP_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_STATUS_FL_P_RAILP_POS, \
ADS114S0X_REGISTER_STATUS_FL_P_RAILP_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_P_RAILP_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_STATUS_FL_P_RAILP_POS, \
ADS114S0X_REGISTER_STATUS_FL_P_RAILP_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_P_RAILN_LENGTH 1
#define ADS114S0X_REGISTER_STATUS_FL_P_RAILN_POS 4
#define ADS114S0X_REGISTER_STATUS_FL_P_RAILN_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_STATUS_FL_P_RAILN_POS, \
ADS114S0X_REGISTER_STATUS_FL_P_RAILN_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_P_RAILN_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_STATUS_FL_P_RAILN_POS, \
ADS114S0X_REGISTER_STATUS_FL_P_RAILN_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_N_RAILP_LENGTH 1
#define ADS114S0X_REGISTER_STATUS_FL_N_RAILP_POS 3
#define ADS114S0X_REGISTER_STATUS_FL_N_RAILP_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_STATUS_FL_N_RAILP_POS, \
ADS114S0X_REGISTER_STATUS_FL_N_RAILP_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_N_RAILP_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_STATUS_FL_N_RAILP_POS, \
ADS114S0X_REGISTER_STATUS_FL_N_RAILP_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_N_RAILN_LENGTH 1
#define ADS114S0X_REGISTER_STATUS_FL_N_RAILN_POS 2
#define ADS114S0X_REGISTER_STATUS_FL_N_RAILN_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_STATUS_FL_N_RAILN_POS, \
ADS114S0X_REGISTER_STATUS_FL_N_RAILN_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_N_RAILN_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_STATUS_FL_N_RAILN_POS, \
ADS114S0X_REGISTER_STATUS_FL_N_RAILN_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_REF_L1_LENGTH 1
#define ADS114S0X_REGISTER_STATUS_FL_REF_L1_POS 1
#define ADS114S0X_REGISTER_STATUS_FL_REF_L1_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_STATUS_FL_REF_L1_POS, \
ADS114S0X_REGISTER_STATUS_FL_REF_L1_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_REF_L1_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_STATUS_FL_REF_L1_POS, \
ADS114S0X_REGISTER_STATUS_FL_REF_L1_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_REF_L0_LENGTH 1
#define ADS114S0X_REGISTER_STATUS_FL_REF_L0_POS 0
#define ADS114S0X_REGISTER_STATUS_FL_REF_L0_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_STATUS_FL_REF_L0_POS, \
ADS114S0X_REGISTER_STATUS_FL_REF_L0_LENGTH)
#define ADS114S0X_REGISTER_STATUS_FL_REF_L0_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_STATUS_FL_REF_L0_POS, \
ADS114S0X_REGISTER_STATUS_FL_REF_L0_LENGTH)
#define ADS114S0X_REGISTER_INPMUX_MUXP_LENGTH 4
#define ADS114S0X_REGISTER_INPMUX_MUXP_POS 4
#define ADS114S0X_REGISTER_INPMUX_MUXP_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_INPMUX_MUXP_POS, \
ADS114S0X_REGISTER_INPMUX_MUXP_LENGTH)
#define ADS114S0X_REGISTER_INPMUX_MUXP_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_INPMUX_MUXP_POS, \
ADS114S0X_REGISTER_INPMUX_MUXP_LENGTH)
#define ADS114S0X_REGISTER_INPMUX_MUXN_LENGTH 4
#define ADS114S0X_REGISTER_INPMUX_MUXN_POS 0
#define ADS114S0X_REGISTER_INPMUX_MUXN_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_INPMUX_MUXN_POS, \
ADS114S0X_REGISTER_INPMUX_MUXN_LENGTH)
#define ADS114S0X_REGISTER_INPMUX_MUXN_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_INPMUX_MUXN_POS, \
ADS114S0X_REGISTER_INPMUX_MUXN_LENGTH)
#define ADS114S0X_REGISTER_PGA_DELAY_LENGTH 3
#define ADS114S0X_REGISTER_PGA_DELAY_POS 5
#define ADS114S0X_REGISTER_PGA_DELAY_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_PGA_DELAY_POS, \
ADS114S0X_REGISTER_PGA_DELAY_LENGTH)
#define ADS114S0X_REGISTER_PGA_DELAY_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_PGA_DELAY_POS, \
ADS114S0X_REGISTER_PGA_DELAY_LENGTH)
#define ADS114S0X_REGISTER_PGA_PGA_EN_LENGTH 2
#define ADS114S0X_REGISTER_PGA_PGA_EN_POS 3
#define ADS114S0X_REGISTER_PGA_PGA_EN_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_PGA_PGA_EN_POS, \
ADS114S0X_REGISTER_PGA_PGA_EN_LENGTH)
#define ADS114S0X_REGISTER_PGA_PGA_EN_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_PGA_PGA_EN_POS, \
ADS114S0X_REGISTER_PGA_PGA_EN_LENGTH)
#define ADS114S0X_REGISTER_PGA_GAIN_LENGTH 3
#define ADS114S0X_REGISTER_PGA_GAIN_POS 0
#define ADS114S0X_REGISTER_PGA_GAIN_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_PGA_GAIN_POS, \
ADS114S0X_REGISTER_PGA_GAIN_LENGTH)
#define ADS114S0X_REGISTER_PGA_GAIN_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_PGA_GAIN_POS, \
ADS114S0X_REGISTER_PGA_GAIN_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_G_CHOP_LENGTH 1
#define ADS114S0X_REGISTER_DATARATE_G_CHOP_POS 7
#define ADS114S0X_REGISTER_DATARATE_G_CHOP_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_DATARATE_G_CHOP_POS, \
ADS114S0X_REGISTER_DATARATE_G_CHOP_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_G_CHOP_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_DATARATE_G_CHOP_POS, \
ADS114S0X_REGISTER_DATARATE_G_CHOP_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_CLK_LENGTH 1
#define ADS114S0X_REGISTER_DATARATE_CLK_POS 6
#define ADS114S0X_REGISTER_DATARATE_CLK_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_DATARATE_CLK_POS, \
ADS114S0X_REGISTER_DATARATE_CLK_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_CLK_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_DATARATE_CLK_POS, \
ADS114S0X_REGISTER_DATARATE_CLK_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_MODE_LENGTH 1
#define ADS114S0X_REGISTER_DATARATE_MODE_POS 5
#define ADS114S0X_REGISTER_DATARATE_MODE_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_DATARATE_MODE_POS, \
ADS114S0X_REGISTER_DATARATE_MODE_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_MODE_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_DATARATE_MODE_POS, \
ADS114S0X_REGISTER_DATARATE_MODE_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_FILTER_LENGTH 1
#define ADS114S0X_REGISTER_DATARATE_FILTER_POS 4
#define ADS114S0X_REGISTER_DATARATE_FILTER_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_DATARATE_FILTER_POS, \
ADS114S0X_REGISTER_DATARATE_FILTER_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_FILTER_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_DATARATE_FILTER_POS, \
ADS114S0X_REGISTER_DATARATE_FILTER_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_DR_LENGTH 4
#define ADS114S0X_REGISTER_DATARATE_DR_POS 0
#define ADS114S0X_REGISTER_DATARATE_DR_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_DATARATE_DR_POS, \
ADS114S0X_REGISTER_DATARATE_DR_LENGTH)
#define ADS114S0X_REGISTER_DATARATE_DR_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_DATARATE_DR_POS, \
ADS114S0X_REGISTER_DATARATE_DR_LENGTH)
#define ADS114S0X_REGISTER_REF_FL_REF_EN_LENGTH 2
#define ADS114S0X_REGISTER_REF_FL_REF_EN_POS 6
#define ADS114S0X_REGISTER_REF_FL_REF_EN_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_REF_FL_REF_EN_POS, \
ADS114S0X_REGISTER_REF_FL_REF_EN_LENGTH)
#define ADS114S0X_REGISTER_REF_FL_REF_EN_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_REF_FL_REF_EN_POS, \
ADS114S0X_REGISTER_REF_FL_REF_EN_LENGTH)
#define ADS114S0X_REGISTER_REF_NOT_REFP_BUF_LENGTH 1
#define ADS114S0X_REGISTER_REF_NOT_REFP_BUF_POS 5
#define ADS114S0X_REGISTER_REF_NOT_REFP_BUF_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_REF_NOT_REFP_BUF_POS, \
ADS114S0X_REGISTER_REF_NOT_REFP_BUF_LENGTH)
#define ADS114S0X_REGISTER_REF_NOT_REFP_BUF_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_REF_NOT_REFP_BUF_POS, \
ADS114S0X_REGISTER_REF_NOT_REFP_BUF_LENGTH)
#define ADS114S0X_REGISTER_REF_NOT_REFN_BUF_LENGTH 1
#define ADS114S0X_REGISTER_REF_NOT_REFN_BUF_POS 4
#define ADS114S0X_REGISTER_REF_NOT_REFN_BUF_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_REF_NOT_REFN_BUF_POS, \
ADS114S0X_REGISTER_REF_NOT_REFN_BUF_LENGTH)
#define ADS114S0X_REGISTER_REF_NOT_REFN_BUF_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_REF_NOT_REFN_BUF_POS, \
ADS114S0X_REGISTER_REF_NOT_REFN_BUF_LENGTH)
#define ADS114S0X_REGISTER_REF_REFSEL_LENGTH 2
#define ADS114S0X_REGISTER_REF_REFSEL_POS 2
#define ADS114S0X_REGISTER_REF_REFSEL_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_REF_REFSEL_POS, \
ADS114S0X_REGISTER_REF_REFSEL_LENGTH)
#define ADS114S0X_REGISTER_REF_REFSEL_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_REF_REFSEL_POS, \
ADS114S0X_REGISTER_REF_REFSEL_LENGTH)
#define ADS114S0X_REGISTER_REF_REFCON_LENGTH 2
#define ADS114S0X_REGISTER_REF_REFCON_POS 0
#define ADS114S0X_REGISTER_REF_REFCON_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_REF_REFCON_POS, \
ADS114S0X_REGISTER_REF_REFCON_LENGTH)
#define ADS114S0X_REGISTER_REF_REFCON_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_REF_REFCON_POS, \
ADS114S0X_REGISTER_REF_REFCON_LENGTH)
#define ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_LENGTH 1
#define ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_POS 7
#define ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_POS, \
ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_LENGTH)
#define ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_POS, \
ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_LENGTH)
#define ADS114S0X_REGISTER_IDACMAG_PSW_LENGTH 1
#define ADS114S0X_REGISTER_IDACMAG_PSW_POS 6
#define ADS114S0X_REGISTER_IDACMAG_PSW_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_IDACMAG_PSW_POS, \
ADS114S0X_REGISTER_IDACMAG_PSW_LENGTH)
#define ADS114S0X_REGISTER_IDACMAG_PSW_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_IDACMAG_PSW_POS, \
ADS114S0X_REGISTER_IDACMAG_PSW_LENGTH)
#define ADS114S0X_REGISTER_IDACMAG_IMAG_LENGTH 4
#define ADS114S0X_REGISTER_IDACMAG_IMAG_POS 0
#define ADS114S0X_REGISTER_IDACMAG_IMAG_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_IDACMAG_IMAG_POS, \
ADS114S0X_REGISTER_IDACMAG_IMAG_LENGTH)
#define ADS114S0X_REGISTER_IDACMAG_IMAG_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_IDACMAG_IMAG_POS, \
ADS114S0X_REGISTER_IDACMAG_IMAG_LENGTH)
#define ADS114S0X_REGISTER_IDACMUX_I2MUX_LENGTH 4
#define ADS114S0X_REGISTER_IDACMUX_I2MUX_POS 4
#define ADS114S0X_REGISTER_IDACMUX_I2MUX_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_IDACMUX_I2MUX_POS, \
ADS114S0X_REGISTER_IDACMUX_I2MUX_LENGTH)
#define ADS114S0X_REGISTER_IDACMUX_I2MUX_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_IDACMUX_I2MUX_POS, \
ADS114S0X_REGISTER_IDACMUX_I2MUX_LENGTH)
#define ADS114S0X_REGISTER_IDACMUX_I1MUX_LENGTH 4
#define ADS114S0X_REGISTER_IDACMUX_I1MUX_POS 0
#define ADS114S0X_REGISTER_IDACMUX_I1MUX_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_IDACMUX_I1MUX_POS, \
ADS114S0X_REGISTER_IDACMUX_I1MUX_LENGTH)
#define ADS114S0X_REGISTER_IDACMUX_I1MUX_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_IDACMUX_I1MUX_POS, \
ADS114S0X_REGISTER_IDACMUX_I1MUX_LENGTH)
#define ADS114S0X_REGISTER_GPIODAT_DIR_LENGTH 4
#define ADS114S0X_REGISTER_GPIODAT_DIR_POS 4
#define ADS114S0X_REGISTER_GPIODAT_DIR_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_GPIODAT_DIR_POS, \
ADS114S0X_REGISTER_GPIODAT_DIR_LENGTH)
#define ADS114S0X_REGISTER_GPIODAT_DIR_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_GPIODAT_DIR_POS, \
ADS114S0X_REGISTER_GPIODAT_DIR_LENGTH)
#define ADS114S0X_REGISTER_GPIODAT_DAT_LENGTH 4
#define ADS114S0X_REGISTER_GPIODAT_DAT_POS 0
#define ADS114S0X_REGISTER_GPIODAT_DAT_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_GPIODAT_DAT_POS, \
ADS114S0X_REGISTER_GPIODAT_DAT_LENGTH)
#define ADS114S0X_REGISTER_GPIODAT_DAT_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_GPIODAT_DAT_POS, \
ADS114S0X_REGISTER_GPIODAT_DAT_LENGTH)
#define ADS114S0X_REGISTER_GPIOCON_CON_LENGTH 4
#define ADS114S0X_REGISTER_GPIOCON_CON_POS 0
#define ADS114S0X_REGISTER_GPIOCON_CON_GET(value) \
ADS114S0X_REGISTER_GET_VALUE(value, ADS114S0X_REGISTER_GPIOCON_CON_POS, \
ADS114S0X_REGISTER_GPIOCON_CON_LENGTH)
#define ADS114S0X_REGISTER_GPIOCON_CON_SET(target, value) \
ADS114S0X_REGISTER_SET_VALUE(target, value, ADS114S0X_REGISTER_GPIOCON_CON_POS, \
ADS114S0X_REGISTER_GPIOCON_CON_LENGTH)
/*
* - AIN0 as positive input
* - AIN1 as negative input
*/
#define ADS114S0X_REGISTER_INPMUX_SET_DEFAULTS(target) \
ADS114S0X_REGISTER_INPMUX_MUXP_SET(target, 0b0000); \
ADS114S0X_REGISTER_INPMUX_MUXN_SET(target, 0b0001)
/*
* - disable reference monitor
* - enable positive reference buffer
* - disable negative reference buffer
* - use internal reference
* - enable internal voltage reference
*/
#define ADS114S0X_REGISTER_REF_SET_DEFAULTS(target) \
ADS114S0X_REGISTER_REF_FL_REF_EN_SET(target, 0b00); \
ADS114S0X_REGISTER_REF_NOT_REFP_BUF_SET(target, 0b0); \
ADS114S0X_REGISTER_REF_NOT_REFN_BUF_SET(target, 0b1); \
ADS114S0X_REGISTER_REF_REFSEL_SET(target, 0b10); \
ADS114S0X_REGISTER_REF_REFCON_SET(target, 0b01)
/*
* - disable global chop
* - use internal oscillator
* - single shot conversion mode
* - low latency filter
* - 20 samples per second
*/
#define ADS114S0X_REGISTER_DATARATE_SET_DEFAULTS(target) \
ADS114S0X_REGISTER_DATARATE_G_CHOP_SET(target, 0b0); \
ADS114S0X_REGISTER_DATARATE_CLK_SET(target, 0b0); \
ADS114S0X_REGISTER_DATARATE_MODE_SET(target, 0b1); \
ADS114S0X_REGISTER_DATARATE_FILTER_SET(target, 0b1); \
ADS114S0X_REGISTER_DATARATE_DR_SET(target, 0b0100)
/*
* - delay of 14*t_mod
* - disable gain
* - gain 1
*/
#define ADS114S0X_REGISTER_PGA_SET_DEFAULTS(target) \
ADS114S0X_REGISTER_PGA_DELAY_SET(target, 0b000); \
ADS114S0X_REGISTER_PGA_PGA_EN_SET(target, 0b00); \
ADS114S0X_REGISTER_PGA_GAIN_SET(target, 0b000)
/*
* - disable PGA output rail flag
* - low-side power switch
* - IDAC off
*/
#define ADS114S0X_REGISTER_IDACMAG_SET_DEFAULTS(target) \
ADS114S0X_REGISTER_IDACMAG_FL_RAIL_EN_SET(target, 0b0); \
ADS114S0X_REGISTER_IDACMAG_PSW_SET(target, 0b0); \
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(target, 0b0000)
/*
* - disconnect IDAC1
* - disconnect IDAC2
*/
#define ADS114S0X_REGISTER_IDACMUX_SET_DEFAULTS(target) \
ADS114S0X_REGISTER_IDACMUX_I1MUX_SET(target, 0b1111); \
ADS114S0X_REGISTER_IDACMUX_I2MUX_SET(target, 0b1111)
struct ads114s0x_config {
struct spi_dt_spec bus;
#if CONFIG_ADC_ASYNC
k_thread_stack_t *stack;
#endif
const struct gpio_dt_spec gpio_reset;
const struct gpio_dt_spec gpio_data_ready;
const struct gpio_dt_spec gpio_start_sync;
int idac_current;
};
struct ads114s0x_data {
struct adc_context ctx;
#if CONFIG_ADC_ASYNC
struct k_thread thread;
#endif /* CONFIG_ADC_ASYNC */
struct gpio_callback callback_data_ready;
struct k_sem data_ready_signal;
struct k_sem acquire_signal;
int16_t *buffer;
int16_t *buffer_ptr;
#if CONFIG_ADC_ADS114S0X_GPIO
struct k_mutex gpio_lock;
uint8_t gpio_enabled; /* one bit per GPIO, 1 = enabled */
uint8_t gpio_direction; /* one bit per GPIO, 1 = input */
uint8_t gpio_value; /* one bit per GPIO, 1 = high */
#endif /* CONFIG_ADC_ADS114S0X_GPIO */
};
static void ads114s0x_data_ready_handler(const struct device *dev, struct gpio_callback *gpio_cb,
uint32_t pins)
{
ARG_UNUSED(dev);
ARG_UNUSED(pins);
struct ads114s0x_data *data =
CONTAINER_OF(gpio_cb, struct ads114s0x_data, callback_data_ready);
k_sem_give(&data->data_ready_signal);
}
static int ads114s0x_read_register(const struct spi_dt_spec *bus,
enum ads114s0x_register register_address, uint8_t *value)
{
uint8_t buffer_tx[3];
uint8_t buffer_rx[ARRAY_SIZE(buffer_tx)];
const struct spi_buf tx_buf[] = {{
.buf = buffer_tx,
.len = ARRAY_SIZE(buffer_tx),
}};
const struct spi_buf rx_buf[] = {{
.buf = buffer_rx,
.len = ARRAY_SIZE(buffer_rx),
}};
const struct spi_buf_set tx = {
.buffers = tx_buf,
.count = ARRAY_SIZE(tx_buf),
};
const struct spi_buf_set rx = {
.buffers = rx_buf,
.count = ARRAY_SIZE(rx_buf),
};
buffer_tx[0] = ((uint8_t)ADS114S0X_COMMAND_RREG) | ((uint8_t)register_address);
/* read one register */
buffer_tx[1] = 0x00;
int result = spi_transceive_dt(bus, &tx, &rx);
if (result != 0) {
LOG_ERR("spi_transceive failed with error %i", result);
return result;
}
*value = buffer_rx[2];
LOG_DBG("read from register 0x%02X value 0x%02X", register_address, *value);
return 0;
}
static int ads114s0x_write_register(const struct spi_dt_spec *bus,
enum ads114s0x_register register_address, uint8_t value)
{
uint8_t buffer_tx[3];
const struct spi_buf tx_buf[] = {{
.buf = buffer_tx,
.len = ARRAY_SIZE(buffer_tx),
}};
const struct spi_buf_set tx = {
.buffers = tx_buf,
.count = ARRAY_SIZE(tx_buf),
};
buffer_tx[0] = ((uint8_t)ADS114S0X_COMMAND_WREG) | ((uint8_t)register_address);
/* write one register */
buffer_tx[1] = 0x00;
buffer_tx[2] = value;
LOG_DBG("writing to register 0x%02X value 0x%02X", register_address, value);
int result = spi_write_dt(bus, &tx);
if (result != 0) {
LOG_ERR("spi_write failed with error %i", result);
return result;
}
return 0;
}
static int ads114s0x_write_multiple_registers(const struct spi_dt_spec *bus,
enum ads114s0x_register *register_addresses,
uint8_t *values, size_t count)
{
uint8_t buffer_tx[2];
const struct spi_buf tx_buf[] = {
{
.buf = buffer_tx,
.len = ARRAY_SIZE(buffer_tx),
},
{
.buf = values,
.len = count,
},
};
const struct spi_buf_set tx = {
.buffers = tx_buf,
.count = ARRAY_SIZE(tx_buf),
};
if (count == 0) {
LOG_WRN("ignoring the command to write 0 registers");
return -EINVAL;
}
buffer_tx[0] = ((uint8_t)ADS114S0X_COMMAND_WREG) | ((uint8_t)register_addresses[0]);
buffer_tx[1] = count - 1;
LOG_HEXDUMP_DBG(register_addresses, count, "writing to registers");
LOG_HEXDUMP_DBG(values, count, "values");
/* ensure that the register addresses are in the correct order */
for (size_t i = 1; i < count; ++i) {
__ASSERT(register_addresses[i - 1] + 1 == register_addresses[i],
"register addresses are not consecutive");
}
int result = spi_write_dt(bus, &tx);
if (result != 0) {
LOG_ERR("spi_write failed with error %i", result);
return result;
}
return 0;
}
static int ads114s0x_send_command(const struct spi_dt_spec *bus, enum ads114s0x_command command)
{
uint8_t buffer_tx[1];
const struct spi_buf tx_buf[] = {{
.buf = buffer_tx,
.len = ARRAY_SIZE(buffer_tx),
}};
const struct spi_buf_set tx = {
.buffers = tx_buf,
.count = ARRAY_SIZE(tx_buf),
};
buffer_tx[0] = (uint8_t)command;
LOG_DBG("sending command 0x%02X", command);
int result = spi_write_dt(bus, &tx);
if (result != 0) {
LOG_ERR("spi_write failed with error %i", result);
return result;
}
return 0;
}
static int ads114s0x_channel_setup(const struct device *dev,
const struct adc_channel_cfg *channel_cfg)
{
const struct ads114s0x_config *config = dev->config;
uint8_t input_mux = 0;
uint8_t reference_control = 0;
uint8_t data_rate = 0;
uint8_t gain = 0;
uint8_t idac_magnitude = 0;
uint8_t idac_mux = 0;
uint8_t pin_selections[4];
size_t pin_selections_size;
int result;
enum ads114s0x_register register_addresses[6];
uint8_t values[ARRAY_SIZE(register_addresses)];
ADS114S0X_REGISTER_INPMUX_SET_DEFAULTS(gain);
ADS114S0X_REGISTER_REF_SET_DEFAULTS(reference_control);
ADS114S0X_REGISTER_DATARATE_SET_DEFAULTS(data_rate);
ADS114S0X_REGISTER_PGA_SET_DEFAULTS(gain);
ADS114S0X_REGISTER_IDACMAG_SET_DEFAULTS(idac_magnitude);
ADS114S0X_REGISTER_IDACMUX_SET_DEFAULTS(idac_mux);
if (channel_cfg->channel_id != 0) {
LOG_ERR("only one channel is supported");
return -EINVAL;
}
switch (channel_cfg->reference) {
case ADC_REF_INTERNAL:
/* disable negative reference buffer */
ADS114S0X_REGISTER_REF_NOT_REFN_BUF_SET(reference_control, 0b1);
/* disable positive reference buffer */
ADS114S0X_REGISTER_REF_NOT_REFP_BUF_SET(reference_control, 0b1);
/* use internal reference */
ADS114S0X_REGISTER_REF_REFSEL_SET(reference_control, 0b10);
break;
case ADC_REF_EXTERNAL0:
/* enable negative reference buffer */
ADS114S0X_REGISTER_REF_NOT_REFN_BUF_SET(reference_control, 0b0);
/* enable positive reference buffer */
ADS114S0X_REGISTER_REF_NOT_REFP_BUF_SET(reference_control, 0b0);
/* use external reference 0*/
ADS114S0X_REGISTER_REF_REFSEL_SET(reference_control, 0b00);
break;
case ADC_REF_EXTERNAL1:
/* enable negative reference buffer */
ADS114S0X_REGISTER_REF_NOT_REFN_BUF_SET(reference_control, 0b0);
/* enable positive reference buffer */
ADS114S0X_REGISTER_REF_NOT_REFP_BUF_SET(reference_control, 0b0);
/* use external reference 0*/
ADS114S0X_REGISTER_REF_REFSEL_SET(reference_control, 0b01);
break;
default:
LOG_ERR("reference %i is not supported", channel_cfg->reference);
return -EINVAL;
}
if (channel_cfg->differential) {
if (channel_cfg->input_positive >= ADS114S0X_INPUT_SELECTION_AINCOM) {
LOG_ERR("positive channel input %i is invalid",
channel_cfg->input_positive);
return -EINVAL;
}
if (channel_cfg->input_negative >= ADS114S0X_INPUT_SELECTION_AINCOM) {
LOG_ERR("negative channel input %i is invalid",
channel_cfg->input_negative);
return -EINVAL;
}
if (channel_cfg->input_positive == channel_cfg->input_negative) {
LOG_ERR("negative and positive channel inputs must be different");
return -EINVAL;
}
ADS114S0X_REGISTER_INPMUX_MUXP_SET(input_mux, channel_cfg->input_positive);
ADS114S0X_REGISTER_INPMUX_MUXN_SET(input_mux, channel_cfg->input_negative);
pin_selections[0] = channel_cfg->input_positive;
pin_selections[1] = channel_cfg->input_negative;
} else {
if (channel_cfg->input_positive >= ADS114S0X_INPUT_SELECTION_AINCOM) {
LOG_ERR("channel input %i is invalid", channel_cfg->input_positive);
return -EINVAL;
}
ADS114S0X_REGISTER_INPMUX_MUXP_SET(input_mux, channel_cfg->input_positive);
ADS114S0X_REGISTER_INPMUX_MUXN_SET(input_mux, ADS114S0X_INPUT_SELECTION_AINCOM);
pin_selections[0] = channel_cfg->input_positive;
pin_selections[1] = ADS114S0X_INPUT_SELECTION_AINCOM;
}
switch (channel_cfg->gain) {
case ADC_GAIN_1:
/* set gain value */
ADS114S0X_REGISTER_PGA_GAIN_SET(gain, 0b000);
break;
case ADC_GAIN_2:
ADS114S0X_REGISTER_PGA_GAIN_SET(gain, 0b001);
break;
case ADC_GAIN_4:
ADS114S0X_REGISTER_PGA_GAIN_SET(gain, 0b010);
break;
case ADC_GAIN_8:
ADS114S0X_REGISTER_PGA_GAIN_SET(gain, 0b011);
break;
case ADC_GAIN_16:
ADS114S0X_REGISTER_PGA_GAIN_SET(gain, 0b100);
break;
case ADC_GAIN_32:
ADS114S0X_REGISTER_PGA_GAIN_SET(gain, 0b101);
break;
case ADC_GAIN_64:
ADS114S0X_REGISTER_PGA_GAIN_SET(gain, 0b110);
break;
case ADC_GAIN_128:
ADS114S0X_REGISTER_PGA_GAIN_SET(gain, 0b111);
break;
default:
LOG_ERR("gain value %i not supported", channel_cfg->gain);
return -EINVAL;
}
if (channel_cfg->gain != ADC_GAIN_1) {
/* enable gain */
ADS114S0X_REGISTER_PGA_PGA_EN_SET(gain, 0b01);
}
switch (config->idac_current) {
case 0:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b0000);
break;
case 10:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b0001);
break;
case 50:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b0010);
break;
case 100:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b0011);
break;
case 250:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b0100);
break;
case 500:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b0101);
break;
case 750:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b0110);
break;
case 1000:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b0111);
break;
case 1500:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b1000);
break;
case 2000:
ADS114S0X_REGISTER_IDACMAG_IMAG_SET(idac_magnitude, 0b1001);
break;
default:
LOG_ERR("IDAC magnitude %i not supported", config->idac_current);
return -EINVAL;
}
if (channel_cfg->current_source_pin_set) {
if (channel_cfg->current_source_pin[0] > 0b1111) {
LOG_ERR("invalid selection %i for I1MUX",
channel_cfg->current_source_pin[0]);
return -EINVAL;
}
if (channel_cfg->current_source_pin[1] > 0b1111) {
LOG_ERR("invalid selection %i for I2MUX",
channel_cfg->current_source_pin[1]);
return -EINVAL;
}
ADS114S0X_REGISTER_IDACMUX_I1MUX_SET(idac_mux, channel_cfg->current_source_pin[0]);
ADS114S0X_REGISTER_IDACMUX_I2MUX_SET(idac_mux, channel_cfg->current_source_pin[1]);
pin_selections[2] = channel_cfg->current_source_pin[0];
pin_selections[3] = channel_cfg->current_source_pin[1];
pin_selections_size = 4;
} else {
pin_selections_size = 2;
}
for (size_t i = 0; i < pin_selections_size; ++i) {
if (pin_selections[i] > ADS114S0X_INPUT_SELECTION_AINCOM) {
continue;
}
for (size_t j = i + 1; j < pin_selections_size; ++j) {
if (pin_selections[j] > ADS114S0X_INPUT_SELECTION_AINCOM) {
continue;
}
if (pin_selections[i] == pin_selections[j]) {
LOG_ERR("pins for inputs and current sources must be different");
return -EINVAL;
}
}
}
register_addresses[0] = ADS114S0X_REGISTER_INPMUX;
register_addresses[1] = ADS114S0X_REGISTER_PGA;
register_addresses[2] = ADS114S0X_REGISTER_DATARATE;
register_addresses[3] = ADS114S0X_REGISTER_REF;
register_addresses[4] = ADS114S0X_REGISTER_IDACMAG;
register_addresses[5] = ADS114S0X_REGISTER_IDACMUX;
BUILD_ASSERT(ARRAY_SIZE(register_addresses) == 6);
values[0] = input_mux;
values[1] = gain;
values[2] = data_rate;
values[3] = reference_control;
values[4] = idac_magnitude;
values[5] = idac_mux;
BUILD_ASSERT(ARRAY_SIZE(values) == 6);
result = ads114s0x_write_multiple_registers(&config->bus, register_addresses, values,
ARRAY_SIZE(values));
if (result != 0) {
LOG_ERR("unable to configure registers");
return result;
}
return 0;
}
static int ads114s0x_validate_buffer_size(const struct adc_sequence *sequence)
{
size_t needed = sizeof(int16_t);
if (sequence->options) {
needed *= (1 + sequence->options->extra_samplings);
}
if (sequence->buffer_size < needed) {
return -ENOMEM;
}
return 0;
}
static int ads114s0x_validate_sequence(const struct device *dev,
const struct adc_sequence *sequence)
{
if (sequence->resolution != ADS114S0X_RESOLUTION) {
LOG_ERR("invalid resolution");
return -EINVAL;
}
if (sequence->channels != BIT(0)) {
LOG_ERR("invalid channel");
return -EINVAL;
}
if (sequence->oversampling) {
LOG_ERR("oversampling is not supported");
return -EINVAL;
}
return ads114s0x_validate_buffer_size(sequence);
}
static void adc_context_update_buffer_pointer(struct adc_context *ctx, bool repeat_sampling)
{
struct ads114s0x_data *data = CONTAINER_OF(ctx, struct ads114s0x_data, ctx);
if (repeat_sampling) {
data->buffer = data->buffer_ptr;
}
}
static void adc_context_start_sampling(struct adc_context *ctx)
{
struct ads114s0x_data *data = CONTAINER_OF(ctx, struct ads114s0x_data, ctx);
data->buffer_ptr = data->buffer;
k_sem_give(&data->acquire_signal);
}
static int ads114s0x_adc_start_read(const struct device *dev, const struct adc_sequence *sequence,
bool wait)
{
int result;
struct ads114s0x_data *data = dev->data;
result = ads114s0x_validate_sequence(dev, sequence);
if (result != 0) {
LOG_ERR("sequence validation failed");
return result;
}
data->buffer = sequence->buffer;
adc_context_start_read(&data->ctx, sequence);
if (wait) {
result = adc_context_wait_for_completion(&data->ctx);
}
return result;
}
static int ads114s0x_send_start_read(const struct device *dev)
{
const struct ads114s0x_config *config = dev->config;
int result;
if (config->gpio_start_sync.port == 0) {
result = ads114s0x_send_command(&config->bus, ADS114S0X_COMMAND_START);
if (result != 0) {
LOG_ERR("unable to send START/SYNC command");
return result;
}
} else {
result = gpio_pin_set_dt(&config->gpio_start_sync, 1);
if (result != 0) {
LOG_ERR("unable to start ADC operation");
return result;
}
k_sleep(K_USEC(ADS114S0X_START_SYNC_PULSE_DURATION_IN_US +
ADS114S0X_SETUP_TIME_IN_US));
result = gpio_pin_set_dt(&config->gpio_start_sync, 0);
if (result != 0) {
LOG_ERR("unable to start ADC operation");
return result;
}
}
return 0;
}
static int ads114s0x_wait_data_ready(const struct device *dev)
{
struct ads114s0x_data *data = dev->data;
return k_sem_take(&data->data_ready_signal, K_FOREVER);
}
static int ads114s0x_read_sample(const struct device *dev, uint16_t *buffer)
{
const struct ads114s0x_config *config = dev->config;
uint8_t buffer_tx[3];
uint8_t buffer_rx[ARRAY_SIZE(buffer_tx)];
const struct spi_buf tx_buf[] = {{
.buf = buffer_tx,
.len = ARRAY_SIZE(buffer_tx),
}};
const struct spi_buf rx_buf[] = {{
.buf = buffer_rx,
.len = ARRAY_SIZE(buffer_rx),
}};
const struct spi_buf_set tx = {
.buffers = tx_buf,
.count = ARRAY_SIZE(tx_buf),
};
const struct spi_buf_set rx = {
.buffers = rx_buf,
.count = ARRAY_SIZE(rx_buf),
};
buffer_tx[0] = (uint8_t)ADS114S0X_COMMAND_RDATA;
int result = spi_transceive_dt(&config->bus, &tx, &rx);
if (result != 0) {
LOG_ERR("spi_transceive failed with error %i", result);
return result;
}
*buffer = sys_get_be16(buffer_rx + 1);
return 0;
}
static int ads114s0x_adc_perform_read(const struct device *dev)
{
int result;
struct ads114s0x_data *data = dev->data;
k_sem_take(&data->acquire_signal, K_FOREVER);
result = ads114s0x_send_start_read(dev);
if (result != 0) {
LOG_ERR("unable to start ADC conversion");
adc_context_complete(&data->ctx, result);
return result;
}
result = ads114s0x_wait_data_ready(dev);
if (result != 0) {
LOG_ERR("waiting for data to be ready failed");
adc_context_complete(&data->ctx, result);
return result;
}
result = ads114s0x_read_sample(dev, data->buffer);
if (result != 0) {
LOG_ERR("reading sample failed");
adc_context_complete(&data->ctx, result);
return result;
}
data->buffer++;
adc_context_on_sampling_done(&data->ctx, dev);
return result;
}
#if CONFIG_ADC_ASYNC
static int ads114s0x_adc_read_async(const struct device *dev, const struct adc_sequence *sequence,
struct k_poll_signal *async)
{
int result;
struct ads114s0x_data *data = dev->data;
adc_context_lock(&data->ctx, true, async);
result = ads114s0x_adc_start_read(dev, sequence, true);
adc_context_release(&data->ctx, result);
return result;
}
static int ads114s0x_read(const struct device *dev, const struct adc_sequence *sequence)
{
int result;
struct ads114s0x_data *data = dev->data;
adc_context_lock(&data->ctx, false, NULL);
result = ads114s0x_adc_start_read(dev, sequence, true);
adc_context_release(&data->ctx, result);
return result;
}
#else
static int ads114s0x_read(const struct device *dev, const struct adc_sequence *sequence)
{
int result;
struct ads114s0x_data *data = dev->data;
adc_context_lock(&data->ctx, false, NULL);
result = ads114s0x_adc_start_read(dev, sequence, false);
while (result == 0 && k_sem_take(&data->ctx.sync, K_NO_WAIT) != 0) {
result = ads114s0x_adc_perform_read(dev);
}
adc_context_release(&data->ctx, result);
return result;
}
#endif
#if CONFIG_ADC_ASYNC
static void ads114s0x_acquisition_thread(struct device *dev)
{
while (true) {
ads114s0x_adc_perform_read(dev);
}
}
#endif
#ifdef CONFIG_ADC_ADS114S0X_GPIO
static int ads114s0x_gpio_write_config(const struct device *dev)
{
struct ads114s0x_data *data = dev->data;
const struct ads114s0x_config *config = dev->config;
uint8_t register_addresses[2];
uint8_t register_values[ARRAY_SIZE(register_addresses)];
uint8_t gpio_dat = 0;
uint8_t gpio_con = 0;
ADS114S0X_REGISTER_GPIOCON_CON_SET(gpio_con, data->gpio_enabled);
ADS114S0X_REGISTER_GPIODAT_DAT_SET(gpio_dat, data->gpio_value);
ADS114S0X_REGISTER_GPIODAT_DIR_SET(gpio_dat, data->gpio_direction);
register_values[0] = gpio_dat;
register_values[1] = gpio_con;
register_addresses[0] = ADS114S0X_REGISTER_GPIODAT;
register_addresses[1] = ADS114S0X_REGISTER_GPIOCON;
return ads114s0x_write_multiple_registers(&config->bus, register_addresses, register_values,
ARRAY_SIZE(register_values));
}
static int ads114s0x_gpio_write_value(const struct device *dev)
{
struct ads114s0x_data *data = dev->data;
const struct ads114s0x_config *config = dev->config;
uint8_t gpio_dat = 0;
ADS114S0X_REGISTER_GPIODAT_DAT_SET(gpio_dat, data->gpio_value);
ADS114S0X_REGISTER_GPIODAT_DIR_SET(gpio_dat, data->gpio_direction);
return ads114s0x_write_register(&config->bus, ADS114S0X_REGISTER_GPIODAT, gpio_dat);
}
int ads114s0x_gpio_set_output(const struct device *dev, uint8_t pin, bool initial_value)
{
struct ads114s0x_data *data = dev->data;
int result = 0;
if (pin > ADS114S0X_GPIO_MAX) {
LOG_ERR("invalid pin %i", pin);
return -EINVAL;
}
k_mutex_lock(&data->gpio_lock, K_FOREVER);
data->gpio_enabled |= BIT(pin);
data->gpio_direction &= ~BIT(pin);
if (initial_value) {
data->gpio_value |= BIT(pin);
} else {
data->gpio_value &= ~BIT(pin);
}
result = ads114s0x_gpio_write_config(dev);
k_mutex_unlock(&data->gpio_lock);
return result;
}
int ads114s0x_gpio_set_input(const struct device *dev, uint8_t pin)
{
struct ads114s0x_data *data = dev->data;
int result = 0;
if (pin > ADS114S0X_GPIO_MAX) {
LOG_ERR("invalid pin %i", pin);
return -EINVAL;
}
k_mutex_lock(&data->gpio_lock, K_FOREVER);
data->gpio_enabled |= BIT(pin);
data->gpio_direction |= BIT(pin);
data->gpio_value &= ~BIT(pin);
result = ads114s0x_gpio_write_config(dev);
k_mutex_unlock(&data->gpio_lock);
return result;
}
int ads114s0x_gpio_deconfigure(const struct device *dev, uint8_t pin)
{
struct ads114s0x_data *data = dev->data;
int result = 0;
if (pin > ADS114S0X_GPIO_MAX) {
LOG_ERR("invalid pin %i", pin);
return -EINVAL;
}
k_mutex_lock(&data->gpio_lock, K_FOREVER);
data->gpio_enabled &= ~BIT(pin);
data->gpio_direction |= BIT(pin);
data->gpio_value &= ~BIT(pin);
result = ads114s0x_gpio_write_config(dev);
k_mutex_unlock(&data->gpio_lock);
return result;
}
int ads114s0x_gpio_set_pin_value(const struct device *dev, uint8_t pin, bool value)
{
struct ads114s0x_data *data = dev->data;
int result = 0;
if (pin > ADS114S0X_GPIO_MAX) {
LOG_ERR("invalid pin %i", pin);
return -EINVAL;
}
k_mutex_lock(&data->gpio_lock, K_FOREVER);
if ((BIT(pin) & data->gpio_enabled) == 0) {
LOG_ERR("gpio pin %i not configured", pin);
result = -EINVAL;
} else if ((BIT(pin) & data->gpio_direction) != 0) {
LOG_ERR("gpio pin %i not configured as output", pin);
result = -EINVAL;
} else {
data->gpio_value |= BIT(pin);
result = ads114s0x_gpio_write_value(dev);
}
k_mutex_unlock(&data->gpio_lock);
return result;
}
int ads114s0x_gpio_get_pin_value(const struct device *dev, uint8_t pin, bool *value)
{
struct ads114s0x_data *data = dev->data;
const struct ads114s0x_config *config = dev->config;
int result = 0;
uint8_t gpio_dat;
if (pin > ADS114S0X_GPIO_MAX) {
LOG_ERR("invalid pin %i", pin);
return -EINVAL;
}
k_mutex_lock(&data->gpio_lock, K_FOREVER);
if ((BIT(pin) & data->gpio_enabled) == 0) {
LOG_ERR("gpio pin %i not configured", pin);
result = -EINVAL;
} else if ((BIT(pin) & data->gpio_direction) == 0) {
LOG_ERR("gpio pin %i not configured as input", pin);
result = -EINVAL;
} else {
result = ads114s0x_read_register(&config->bus, ADS114S0X_REGISTER_GPIODAT,
&gpio_dat);
data->gpio_value = ADS114S0X_REGISTER_GPIODAT_DAT_GET(gpio_dat);
*value = (BIT(pin) & data->gpio_value) != 0;
}
k_mutex_unlock(&data->gpio_lock);
return result;
}
int ads114s0x_gpio_port_get_raw(const struct device *dev, gpio_port_value_t *value)
{
struct ads114s0x_data *data = dev->data;
const struct ads114s0x_config *config = dev->config;
int result = 0;
uint8_t gpio_dat;
k_mutex_lock(&data->gpio_lock, K_FOREVER);
result = ads114s0x_read_register(&config->bus, ADS114S0X_REGISTER_GPIODAT, &gpio_dat);
data->gpio_value = ADS114S0X_REGISTER_GPIODAT_DAT_GET(gpio_dat);
*value = data->gpio_value;
k_mutex_unlock(&data->gpio_lock);
return result;
}
int ads114s0x_gpio_port_set_masked_raw(const struct device *dev, gpio_port_pins_t mask,
gpio_port_value_t value)
{
struct ads114s0x_data *data = dev->data;
int result = 0;
k_mutex_lock(&data->gpio_lock, K_FOREVER);
data->gpio_value = ((data->gpio_value & ~mask) | (mask & value)) & data->gpio_enabled &
~data->gpio_direction;
result = ads114s0x_gpio_write_value(dev);
k_mutex_unlock(&data->gpio_lock);
return result;
}
int ads114s0x_gpio_port_toggle_bits(const struct device *dev, gpio_port_pins_t pins)
{
struct ads114s0x_data *data = dev->data;
int result = 0;
k_mutex_lock(&data->gpio_lock, K_FOREVER);
data->gpio_value = (data->gpio_value ^ pins) & data->gpio_enabled & ~data->gpio_direction;
result = ads114s0x_gpio_write_value(dev);
k_mutex_unlock(&data->gpio_lock);
return result;
}
#endif /* CONFIG_ADC_ADS114S0X_GPIO */
static int ads114s0x_init(const struct device *dev)
{
uint8_t status = 0;
uint8_t reference_control = 0;
uint8_t reference_control_read;
int result;
const struct ads114s0x_config *config = dev->config;
struct ads114s0x_data *data = dev->data;
adc_context_init(&data->ctx);
k_sem_init(&data->data_ready_signal, 0, 1);
k_sem_init(&data->acquire_signal, 0, 1);
#ifdef CONFIG_ADC_ADS114S0X_GPIO
k_mutex_init(&data->gpio_lock);
#endif /* CONFIG_ADC_ADS114S0X_GPIO */
if (!spi_is_ready_dt(&config->bus)) {
LOG_ERR("SPI device is not ready");
return -ENODEV;
}
if (config->gpio_reset.port != NULL) {
result = gpio_pin_configure_dt(&config->gpio_reset, GPIO_OUTPUT_ACTIVE);
if (result != 0) {
LOG_ERR("failed to initialize GPIO for reset");
return result;
}
}
if (config->gpio_start_sync.port != NULL) {
result = gpio_pin_configure_dt(&config->gpio_start_sync, GPIO_OUTPUT_INACTIVE);
if (result != 0) {
LOG_ERR("failed to initialize GPIO for start/sync");
return result;
}
}
result = gpio_pin_configure_dt(&config->gpio_data_ready, GPIO_INPUT);
if (result != 0) {
LOG_ERR("failed to initialize GPIO for data ready");
return result;
}
result = gpio_pin_interrupt_configure_dt(&config->gpio_data_ready, GPIO_INT_EDGE_TO_ACTIVE);
if (result != 0) {
LOG_ERR("failed to configure data ready interrupt");
return -EIO;
}
gpio_init_callback(&data->callback_data_ready, ads114s0x_data_ready_handler,
BIT(config->gpio_data_ready.pin));
result = gpio_add_callback(config->gpio_data_ready.port, &data->callback_data_ready);
if (result != 0) {
LOG_ERR("failed to add data ready callback");
return -EIO;
}
#if CONFIG_ADC_ASYNC
const k_tid_t tid = k_thread_create(
&data->thread, config->stack, CONFIG_ADC_ADS114S0X_ACQUISITION_THREAD_STACK_SIZE,
(k_thread_entry_t)ads114s0x_acquisition_thread, (void *)dev, NULL, NULL,
CONFIG_ADC_ADS114S0X_ASYNC_THREAD_INIT_PRIO, 0, K_NO_WAIT);
k_thread_name_set(tid, "adc_ads114s0x");
#endif
k_busy_wait(ADS114S0X_POWER_ON_RESET_TIME_IN_US);
if (config->gpio_reset.port == NULL) {
result = ads114s0x_send_command(&config->bus, ADS114S0X_COMMAND_RESET);
if (result != 0) {
LOG_ERR("unable to send RESET command");
return result;
}
} else {
k_busy_wait(ADS114S0X_RESET_LOW_TIME_IN_US);
gpio_pin_set_dt(&config->gpio_reset, 0);
}
k_busy_wait(ADS114S0X_RESET_DELAY_TIME_IN_US);
result = ads114s0x_read_register(&config->bus, ADS114S0X_REGISTER_STATUS, &status);
if (result != 0) {
LOG_ERR("unable to read status register");
return result;
}
if (ADS114S0X_REGISTER_STATUS_NOT_RDY_GET(status) == 0x01) {
LOG_ERR("ADS114 is not yet ready");
return -EBUSY;
}
/*
* Activate internal voltage reference during initialization to
* avoid the necessary setup time for it to settle later on.
*/
ADS114S0X_REGISTER_REF_SET_DEFAULTS(reference_control);
result = ads114s0x_write_register(&config->bus, ADS114S0X_REGISTER_REF, reference_control);
if (result != 0) {
LOG_ERR("unable to set default reference control values");
return result;
}
/*
* Ensure that the internal voltage reference is active.
*/
result = ads114s0x_read_register(&config->bus, ADS114S0X_REGISTER_REF,
&reference_control_read);
if (result != 0) {
LOG_ERR("unable to read reference control values");
return result;
}
if (reference_control != reference_control_read) {
LOG_ERR("reference control register is incorrect: 0x%02X", reference_control_read);
return -EIO;
}
#ifdef CONFIG_ADC_ADS114S0X_GPIO
data->gpio_enabled = 0x00;
data->gpio_direction = 0x0F;
data->gpio_value = 0x00;
result = ads114s0x_gpio_write_config(dev);
if (result != 0) {
LOG_ERR("unable to configure defaults for GPIOs");
return result;
}
#endif
adc_context_unlock_unconditionally(&data->ctx);
return result;
}
static const struct adc_driver_api api = {
.channel_setup = ads114s0x_channel_setup,
.read = ads114s0x_read,
.ref_internal = ADS114S0X_REF_INTERNAL,
#ifdef CONFIG_ADC_ASYNC
.read_async = ads114s0x_adc_read_async,
#endif
};
BUILD_ASSERT(CONFIG_ADC_INIT_PRIORITY > CONFIG_SPI_INIT_PRIORITY,
"CONFIG_ADC_INIT_PRIORITY must be higher than CONFIG_SPI_INIT_PRIORITY");
#define DT_DRV_COMPAT ti_ads114s08
#define ADC_ADS114S0X_INST_DEFINE(n) \
IF_ENABLED( \
CONFIG_ADC_ASYNC, \
(static K_KERNEL_STACK_DEFINE( \
thread_stack_##n, CONFIG_ADC_ADS114S0X_ACQUISITION_THREAD_STACK_SIZE);)) \
static const struct ads114s0x_config config_##n = { \
.bus = SPI_DT_SPEC_INST_GET( \
n, SPI_OP_MODE_MASTER | SPI_MODE_CPHA | SPI_WORD_SET(8), 0), \
IF_ENABLED(CONFIG_ADC_ASYNC, (.stack = thread_stack_##n,)) \
.gpio_reset = GPIO_DT_SPEC_INST_GET_OR(n, reset_gpios, {0}), \
.gpio_data_ready = GPIO_DT_SPEC_INST_GET(n, drdy_gpios), \
.gpio_start_sync = GPIO_DT_SPEC_INST_GET_OR(n, start_sync_gpios, {0}), \
.idac_current = DT_INST_PROP(n, idac_current), \
}; \
static struct ads114s0x_data data_##n; \
DEVICE_DT_INST_DEFINE(n, ads114s0x_init, NULL, &data_##n, &config_##n, POST_KERNEL, \
CONFIG_ADC_INIT_PRIORITY, &api);
DT_INST_FOREACH_STATUS_OKAY(ADC_ADS114S0X_INST_DEFINE);