| /* |
| * Copyright (c) 2017, Linaro Ltd |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT ti_msp432p4xx_uart |
| |
| /* See www.ti.com/lit/pdf/slau356f, Chapter 22, for MSP432P4XX UART info. */ |
| |
| /* include driverlib/gpio.h (from the msp432p4xx SDK) before Z's uart.h so |
| * that the definition of BIT is not overridden */ |
| #include <driverlib/gpio.h> |
| |
| #include <zephyr/drivers/uart.h> |
| |
| /* Driverlib includes */ |
| #include <driverlib/rom.h> |
| #include <driverlib/rom_map.h> |
| #include <driverlib/uart.h> |
| |
| struct uart_msp432p4xx_config { |
| unsigned long base; |
| }; |
| |
| struct uart_msp432p4xx_dev_data_t { |
| /* UART config structure */ |
| eUSCI_UART_Config uartConfig; |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| uart_irq_callback_user_data_t cb; /**< Callback function pointer */ |
| void *cb_data; /**< Callback function arg */ |
| #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ |
| }; |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static void uart_msp432p4xx_isr(const struct device *dev); |
| #endif |
| |
| static const struct uart_msp432p4xx_config uart_msp432p4xx_dev_cfg_0 = { |
| .base = DT_INST_REG_ADDR(0), |
| }; |
| |
| static struct uart_msp432p4xx_dev_data_t uart_msp432p4xx_dev_data_0 = { |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| .cb = NULL, |
| #endif |
| }; |
| |
| static int baudrate_set(eUSCI_UART_Config *config, uint32_t baudrate) |
| { |
| uint16_t prescalar; |
| uint8_t first_mod_reg, second_mod_reg; |
| |
| switch (baudrate) { |
| case 1200: |
| prescalar = 2500U; |
| first_mod_reg = 0U; |
| second_mod_reg = 0U; |
| break; |
| case 2400: |
| prescalar = 1250U; |
| first_mod_reg = 0U; |
| second_mod_reg = 0U; |
| break; |
| case 4800: |
| prescalar = 625U; |
| first_mod_reg = 0U; |
| second_mod_reg = 0U; |
| break; |
| case 9600: |
| prescalar = 312U; |
| first_mod_reg = 8U; |
| second_mod_reg = 0U; |
| break; |
| case 19200: |
| prescalar = 156U; |
| first_mod_reg = 4U; |
| second_mod_reg = 0U; |
| break; |
| case 38400: |
| prescalar = 78U; |
| first_mod_reg = 2U; |
| second_mod_reg = 0U; |
| break; |
| case 57600: |
| prescalar = 52U; |
| first_mod_reg = 1U; |
| second_mod_reg = 37U; |
| break; |
| case 115200: |
| prescalar = 26U; |
| first_mod_reg = 0U; |
| second_mod_reg = 111U; |
| break; |
| case 230400: |
| prescalar = 13U; |
| first_mod_reg = 0U; |
| second_mod_reg = 37U; |
| break; |
| case 460800: |
| prescalar = 6U; |
| first_mod_reg = 8U; |
| second_mod_reg = 32U; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| config->clockPrescalar = prescalar; |
| config->firstModReg = first_mod_reg; |
| config->secondModReg = second_mod_reg; |
| |
| return 0; |
| } |
| |
| static int uart_msp432p4xx_init(const struct device *dev) |
| { |
| int err; |
| const struct uart_msp432p4xx_config *config = dev->config; |
| eUSCI_UART_Config UartConfig; |
| |
| /* Select P1.2 and P1.3 in UART mode */ |
| MAP_GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1, |
| (GPIO_PIN2 | GPIO_PIN3), GPIO_PRIMARY_MODULE_FUNCTION); |
| |
| UartConfig.selectClockSource = EUSCI_A_UART_CLOCKSOURCE_SMCLK; |
| UartConfig.parity = EUSCI_A_UART_NO_PARITY; |
| UartConfig.msborLsbFirst = EUSCI_A_UART_LSB_FIRST; |
| UartConfig.numberofStopBits = EUSCI_A_UART_ONE_STOP_BIT; |
| UartConfig.uartMode = EUSCI_A_UART_MODE; |
| UartConfig.overSampling = EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION; |
| |
| /* Baud rate settings calculated for 48MHz */ |
| err = baudrate_set(&UartConfig, DT_INST_PROP(0, current_speed)); |
| if (err) { |
| return err; |
| } |
| /* Configure UART Module */ |
| MAP_UART_initModule(config->base, &UartConfig); |
| |
| /* Enable UART module */ |
| MAP_UART_enableModule(config->base); |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| IRQ_CONNECT(DT_INST_IRQN(0), |
| DT_INST_IRQ(0, priority), |
| uart_msp432p4xx_isr, DEVICE_DT_INST_GET(0), |
| 0); |
| irq_enable(DT_INST_IRQN(0)); |
| |
| #endif |
| return 0; |
| } |
| |
| static int uart_msp432p4xx_poll_in(const struct device *dev, unsigned char *c) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| |
| *c = MAP_UART_receiveData(config->base); |
| |
| return 0; |
| } |
| |
| static void uart_msp432p4xx_poll_out(const struct device *dev, |
| unsigned char c) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| |
| MAP_UART_transmitData(config->base, c); |
| } |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static int uart_msp432p4xx_fifo_fill(const struct device *dev, |
| const uint8_t *tx_data, int size) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| unsigned int num_tx = 0U; |
| |
| while ((size - num_tx) > 0) { |
| MAP_UART_transmitData(config->base, tx_data[num_tx]); |
| if (MAP_UART_getInterruptStatus(config->base, |
| EUSCI_A_UART_TRANSMIT_COMPLETE_INTERRUPT_FLAG)) { |
| num_tx++; |
| } else { |
| break; |
| } |
| } |
| |
| return (int)num_tx; |
| } |
| |
| static int uart_msp432p4xx_fifo_read(const struct device *dev, |
| uint8_t *rx_data, |
| const int size) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| unsigned int num_rx = 0U; |
| |
| while (((size - num_rx) > 0) && |
| MAP_UART_getInterruptStatus( |
| config->base, EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG)) { |
| |
| rx_data[num_rx++] = MAP_UART_receiveData(config->base); |
| } |
| |
| return num_rx; |
| } |
| |
| static void uart_msp432p4xx_irq_tx_enable(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| |
| MAP_UART_enableInterrupt(config->base, EUSCI_A_UART_TRANSMIT_INTERRUPT); |
| } |
| |
| static void uart_msp432p4xx_irq_tx_disable(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| |
| MAP_UART_disableInterrupt(config->base, |
| EUSCI_A_UART_TRANSMIT_INTERRUPT); |
| } |
| |
| static int uart_msp432p4xx_irq_tx_ready(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| unsigned int int_status; |
| |
| int_status = MAP_UART_getInterruptStatus( |
| config->base, EUSCI_A_UART_TRANSMIT_INTERRUPT_FLAG); |
| |
| return (int_status & EUSCI_A_IE_TXIE); |
| } |
| |
| static void uart_msp432p4xx_irq_rx_enable(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| |
| MAP_UART_enableInterrupt(config->base, EUSCI_A_UART_RECEIVE_INTERRUPT); |
| } |
| |
| static void uart_msp432p4xx_irq_rx_disable(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| |
| MAP_UART_disableInterrupt(config->base, EUSCI_A_UART_RECEIVE_INTERRUPT); |
| } |
| |
| static int uart_msp432p4xx_irq_tx_complete(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| |
| return MAP_UART_getInterruptStatus( |
| config->base, EUSCI_A_UART_TRANSMIT_COMPLETE_INTERRUPT_FLAG); |
| } |
| |
| static int uart_msp432p4xx_irq_rx_ready(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| unsigned int int_status; |
| |
| int_status = MAP_UART_getInterruptStatus( |
| config->base, EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG); |
| |
| return (int_status & EUSCI_A_IE_RXIE); |
| } |
| |
| static void uart_msp432p4xx_irq_err_enable(const struct device *dev) |
| { |
| /* Not yet used in zephyr */ |
| } |
| |
| static void uart_msp432p4xx_irq_err_disable(const struct device *dev) |
| { |
| /* Not yet used in zephyr */ |
| } |
| |
| static int uart_msp432p4xx_irq_is_pending(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| unsigned int int_status; |
| |
| int_status = MAP_UART_getEnabledInterruptStatus(config->base); |
| |
| return (int_status & (EUSCI_A_IE_TXIE | EUSCI_A_IE_RXIE)); |
| } |
| |
| static int uart_msp432p4xx_irq_update(const struct device *dev) |
| { |
| return 1; |
| } |
| |
| static void uart_msp432p4xx_irq_callback_set(const struct device *dev, |
| uart_irq_callback_user_data_t cb, |
| void *cb_data) |
| { |
| struct uart_msp432p4xx_dev_data_t * const dev_data = dev->data; |
| |
| dev_data->cb = cb; |
| dev_data->cb_data = cb_data; |
| } |
| |
| /** |
| * @brief Interrupt service routine. |
| * |
| * This simply calls the callback function, if one exists. |
| * |
| * @param arg Argument to ISR. |
| */ |
| static void uart_msp432p4xx_isr(const struct device *dev) |
| { |
| const struct uart_msp432p4xx_config *config = dev->config; |
| struct uart_msp432p4xx_dev_data_t * const dev_data = dev->data; |
| unsigned int int_status; |
| |
| int_status = MAP_UART_getEnabledInterruptStatus(config->base); |
| |
| if (dev_data->cb) { |
| dev_data->cb(dev, dev_data->cb_data); |
| } |
| /* |
| * Clear interrupts only after cb called, as Zephyr UART clients expect |
| * to check interrupt status during the callback. |
| */ |
| MAP_UART_disableInterrupt(config->base, int_status); |
| } |
| #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ |
| |
| static const struct uart_driver_api uart_msp432p4xx_driver_api = { |
| .poll_in = uart_msp432p4xx_poll_in, |
| .poll_out = uart_msp432p4xx_poll_out, |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| .fifo_fill = uart_msp432p4xx_fifo_fill, |
| .fifo_read = uart_msp432p4xx_fifo_read, |
| .irq_tx_enable = uart_msp432p4xx_irq_tx_enable, |
| .irq_tx_disable = uart_msp432p4xx_irq_tx_disable, |
| .irq_tx_ready = uart_msp432p4xx_irq_tx_ready, |
| .irq_rx_enable = uart_msp432p4xx_irq_rx_enable, |
| .irq_rx_disable = uart_msp432p4xx_irq_rx_disable, |
| .irq_tx_complete = uart_msp432p4xx_irq_tx_complete, |
| .irq_rx_ready = uart_msp432p4xx_irq_rx_ready, |
| .irq_err_enable = uart_msp432p4xx_irq_err_enable, |
| .irq_err_disable = uart_msp432p4xx_irq_err_disable, |
| .irq_is_pending = uart_msp432p4xx_irq_is_pending, |
| .irq_update = uart_msp432p4xx_irq_update, |
| .irq_callback_set = uart_msp432p4xx_irq_callback_set, |
| #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ |
| }; |
| |
| DEVICE_DT_INST_DEFINE(0, |
| uart_msp432p4xx_init, NULL, |
| &uart_msp432p4xx_dev_data_0, |
| &uart_msp432p4xx_dev_cfg_0, |
| PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY, |
| (void *)&uart_msp432p4xx_driver_api); |