| /* |
| * Copyright (c) 2017, NXP |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** @file |
| * @brief USART driver for LPC54XXX and LPC55xxx families. |
| * |
| * Note: |
| * - The driver is implemented for only one device, multiple instances |
| * will be implemented in the future. |
| */ |
| |
| #include <errno.h> |
| #include <device.h> |
| #include <drivers/uart.h> |
| #include <fsl_usart.h> |
| #include <fsl_clock.h> |
| #include <soc.h> |
| #include <fsl_device_registers.h> |
| |
| struct usart_mcux_lpc_config { |
| USART_Type *base; |
| u32_t clock_source; |
| u32_t baud_rate; |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| void (*irq_config_func)(struct device *dev); |
| #endif |
| }; |
| |
| struct usart_mcux_lpc_data { |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| uart_irq_callback_user_data_t callback; |
| void *cb_data; |
| #endif |
| }; |
| |
| static int usart_mcux_lpc_poll_in(struct device *dev, unsigned char *c) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t flags = USART_GetStatusFlags(config->base); |
| int ret = -1; |
| |
| if (flags & kUSART_RxFifoFullFlag) { |
| *c = USART_ReadByte(config->base); |
| ret = 0; |
| } |
| |
| return ret; |
| } |
| |
| static void usart_mcux_lpc_poll_out(struct device *dev, |
| unsigned char c) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| |
| /* Wait until space is available in TX FIFO */ |
| while (!(USART_GetStatusFlags(config->base) & kUSART_TxFifoEmptyFlag)) { |
| } |
| |
| USART_WriteByte(config->base, c); |
| } |
| |
| static int usart_mcux_lpc_err_check(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t flags = USART_GetStatusFlags(config->base); |
| int err = 0; |
| |
| if (flags & kStatus_USART_RxRingBufferOverrun) { |
| err |= UART_ERROR_OVERRUN; |
| } |
| |
| if (flags & kStatus_USART_ParityError) { |
| err |= UART_ERROR_PARITY; |
| } |
| |
| if (flags & kStatus_USART_FramingError) { |
| err |= UART_ERROR_FRAMING; |
| } |
| |
| USART_ClearStatusFlags(config->base, |
| kStatus_USART_RxRingBufferOverrun | |
| kStatus_USART_ParityError | |
| kStatus_USART_FramingError); |
| |
| return err; |
| } |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static int usart_mcux_lpc_fifo_fill(struct device *dev, const u8_t *tx_data, |
| int len) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u8_t num_tx = 0U; |
| |
| while ((len - num_tx > 0) && |
| (USART_GetStatusFlags(config->base) |
| & kUSART_TxFifoNotFullFlag)) { |
| |
| USART_WriteByte(config->base, tx_data[num_tx++]); |
| } |
| |
| return num_tx; |
| } |
| |
| static int usart_mcux_lpc_fifo_read(struct device *dev, u8_t *rx_data, |
| const int len) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u8_t num_rx = 0U; |
| |
| while ((len - num_rx > 0) && |
| (USART_GetStatusFlags(config->base) |
| & kUSART_RxFifoNotEmptyFlag)) { |
| |
| rx_data[num_rx++] = USART_ReadByte(config->base); |
| } |
| |
| return num_rx; |
| } |
| |
| static void usart_mcux_lpc_irq_tx_enable(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t mask = kUSART_TxLevelInterruptEnable; |
| |
| USART_EnableInterrupts(config->base, mask); |
| } |
| |
| static void usart_mcux_lpc_irq_tx_disable(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t mask = kUSART_TxLevelInterruptEnable; |
| |
| USART_DisableInterrupts(config->base, mask); |
| } |
| |
| static int usart_mcux_lpc_irq_tx_complete(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t flags = USART_GetStatusFlags(config->base); |
| |
| return (flags & kUSART_TxFifoEmptyFlag) != 0U; |
| } |
| |
| static int usart_mcux_lpc_irq_tx_ready(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t mask = kUSART_TxLevelInterruptEnable; |
| |
| return (USART_GetEnabledInterrupts(config->base) & mask) |
| && usart_mcux_lpc_irq_tx_complete(dev); |
| } |
| |
| static void usart_mcux_lpc_irq_rx_enable(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t mask = kUSART_RxLevelInterruptEnable; |
| |
| USART_EnableInterrupts(config->base, mask); |
| } |
| |
| static void usart_mcux_lpc_irq_rx_disable(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t mask = kUSART_RxLevelInterruptEnable; |
| |
| USART_DisableInterrupts(config->base, mask); |
| } |
| |
| static int usart_mcux_lpc_irq_rx_full(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t flags = USART_GetStatusFlags(config->base); |
| |
| return (flags & kUSART_RxFifoNotEmptyFlag) != 0U; |
| } |
| |
| static int usart_mcux_lpc_irq_rx_ready(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t mask = kUSART_RxLevelInterruptEnable; |
| |
| return (USART_GetEnabledInterrupts(config->base) & mask) |
| && usart_mcux_lpc_irq_rx_full(dev); |
| } |
| |
| static void usart_mcux_lpc_irq_err_enable(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t mask = kStatus_USART_NoiseError | |
| kStatus_USART_FramingError | |
| kStatus_USART_ParityError; |
| |
| USART_EnableInterrupts(config->base, mask); |
| } |
| |
| static void usart_mcux_lpc_irq_err_disable(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| u32_t mask = kStatus_USART_NoiseError | |
| kStatus_USART_FramingError | |
| kStatus_USART_ParityError; |
| |
| USART_DisableInterrupts(config->base, mask); |
| } |
| |
| static int usart_mcux_lpc_irq_is_pending(struct device *dev) |
| { |
| return (usart_mcux_lpc_irq_tx_ready(dev) |
| || usart_mcux_lpc_irq_rx_ready(dev)); |
| } |
| |
| static int usart_mcux_lpc_irq_update(struct device *dev) |
| { |
| return 1; |
| } |
| |
| static void usart_mcux_lpc_irq_callback_set(struct device *dev, |
| uart_irq_callback_user_data_t cb, |
| void *cb_data) |
| { |
| struct usart_mcux_lpc_data *data = dev->driver_data; |
| |
| data->callback = cb; |
| data->cb_data = cb_data; |
| } |
| |
| static void usart_mcux_lpc_isr(void *arg) |
| { |
| struct device *dev = arg; |
| struct usart_mcux_lpc_data *data = dev->driver_data; |
| |
| if (data->callback) { |
| data->callback(data->cb_data); |
| } |
| } |
| #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ |
| |
| |
| static int usart_mcux_lpc_init(struct device *dev) |
| { |
| const struct usart_mcux_lpc_config *config = dev->config->config_info; |
| usart_config_t usart_config; |
| u32_t clock_freq; |
| |
| clock_freq = CLOCK_GetFlexCommClkFreq(config->clock_source); |
| |
| USART_GetDefaultConfig(&usart_config); |
| usart_config.enableTx = true; |
| usart_config.enableRx = true; |
| usart_config.baudRate_Bps = config->baud_rate; |
| |
| USART_Init(config->base, &usart_config, clock_freq); |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| config->irq_config_func(dev); |
| #endif |
| |
| return 0; |
| } |
| |
| static const struct uart_driver_api usart_mcux_lpc_driver_api = { |
| .poll_in = usart_mcux_lpc_poll_in, |
| .poll_out = usart_mcux_lpc_poll_out, |
| .err_check = usart_mcux_lpc_err_check, |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| .fifo_fill = usart_mcux_lpc_fifo_fill, |
| .fifo_read = usart_mcux_lpc_fifo_read, |
| .irq_tx_enable = usart_mcux_lpc_irq_tx_enable, |
| .irq_tx_disable = usart_mcux_lpc_irq_tx_disable, |
| .irq_tx_complete = usart_mcux_lpc_irq_tx_complete, |
| .irq_tx_ready = usart_mcux_lpc_irq_tx_ready, |
| .irq_rx_enable = usart_mcux_lpc_irq_rx_enable, |
| .irq_rx_disable = usart_mcux_lpc_irq_rx_disable, |
| .irq_rx_ready = usart_mcux_lpc_irq_rx_ready, |
| .irq_err_enable = usart_mcux_lpc_irq_err_enable, |
| .irq_err_disable = usart_mcux_lpc_irq_err_disable, |
| .irq_is_pending = usart_mcux_lpc_irq_is_pending, |
| .irq_update = usart_mcux_lpc_irq_update, |
| .irq_callback_set = usart_mcux_lpc_irq_callback_set, |
| #endif |
| }; |
| |
| #ifdef CONFIG_USART_MCUX_LPC_0 |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static void usart_mcux_lpc_config_func_0(struct device *dev); |
| #endif |
| |
| static const struct usart_mcux_lpc_config usart_mcux_lpc_0_config = { |
| .base = (USART_Type *)DT_USART_MCUX_LPC_0_BASE_ADDRESS, |
| .clock_source = 0, |
| .baud_rate = DT_USART_MCUX_LPC_0_BAUD_RATE, |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| .irq_config_func = usart_mcux_lpc_config_func_0, |
| #endif |
| }; |
| |
| static struct usart_mcux_lpc_data usart_mcux_lpc_0_data; |
| |
| DEVICE_AND_API_INIT(usart_0, DT_USART_MCUX_LPC_0_NAME, |
| &usart_mcux_lpc_init, |
| &usart_mcux_lpc_0_data, &usart_mcux_lpc_0_config, |
| PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, |
| &usart_mcux_lpc_driver_api); |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static void usart_mcux_lpc_config_func_0(struct device *dev) |
| { |
| IRQ_CONNECT(DT_USART_MCUX_LPC_0_IRQ, |
| DT_USART_MCUX_LPC_0_IRQ_PRI, |
| usart_mcux_lpc_isr, DEVICE_GET(usart_0), 0); |
| |
| irq_enable(DT_USART_MCUX_LPC_0_IRQ); |
| } |
| #endif |
| |
| #endif /* CONFIG_USART_MCUX_LPC_0 */ |