| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <zephyr.h> |
| |
| #include <misc/printk.h> |
| |
| #include <device.h> |
| #include <i2c.h> |
| |
| #define STTS751_I2C_ADDR 0x39 |
| #define TEMP_VAL_HIGH_REG_ADDR 0x00 |
| |
| static void read_temperature(struct device *dev) |
| { |
| uint8_t data; |
| |
| data = TEMP_VAL_HIGH_REG_ADDR; |
| if (i2c_write(dev, &data, sizeof(data), STTS751_I2C_ADDR) != 0) { |
| printk("Error on i2c_write()\n"); |
| return; |
| } |
| |
| data = 0; |
| if (i2c_read(dev, &data, sizeof(data), STTS751_I2C_ADDR) != 0) { |
| printk("Error on i2c_read()\n"); |
| return; |
| } |
| |
| printk("Temperature read successfully: %d C\n", data); |
| } |
| |
| static void read_temperature_by_transfer(struct device *dev) |
| { |
| struct i2c_msg msg[2]; |
| uint8_t write_data = TEMP_VAL_HIGH_REG_ADDR; |
| uint8_t read_data = 0; |
| |
| msg[0].flags = I2C_MSG_WRITE | I2C_MSG_RESTART; |
| msg[0].buf = &write_data; |
| msg[0].len = sizeof(write_data); |
| |
| msg[1].flags = I2C_MSG_READ | I2C_MSG_STOP; |
| msg[1].buf = &read_data; |
| msg[1].len = sizeof(read_data); |
| |
| if (i2c_transfer(dev, msg, 2, STTS751_I2C_ADDR) != 0) { |
| printk("Error on i2c_transfer()\n"); |
| return; |
| } |
| |
| printk("Temperature read successfully: %d C\n", read_data); |
| } |
| |
| void main(void) |
| { |
| union dev_config cfg; |
| struct device *dev; |
| |
| printk("Start read temp. sensor app\n"); |
| |
| cfg.raw = 0; |
| cfg.bits.use_10_bit_addr = 0; |
| cfg.bits.speed = I2C_SPEED_STANDARD; |
| cfg.bits.is_master_device = 1; |
| |
| dev = device_get_binding("I2C_0"); |
| if (!dev) { |
| printk("I2C: Device not found.\n"); |
| return; |
| } |
| |
| if (i2c_configure(dev, cfg.raw) != 0) { |
| printk("Error on i2c_configure()\n"); |
| return; |
| } |
| |
| read_temperature(dev); |
| read_temperature_by_transfer(dev); |
| } |