| /* |
| * Copyright (c) 2017, NXP |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** @file |
| * @brief USART driver for LPC54XXX family |
| * |
| * Note: |
| * - Only basic USART features sufficient to support printf functionality |
| * are currently implemented. |
| * - The driver works only in polling mode, interrupt mode is not implemented. |
| */ |
| |
| #include <errno.h> |
| #include <device.h> |
| #include <uart.h> |
| #include <fsl_lpc_usart.h> |
| #include <fsl_clock.h> |
| #include <soc.h> |
| #include <fsl_device_registers.h> |
| |
| struct usart_mcux_lpc_config { |
| USART_Type *base; |
| clock_name_t clock_source; |
| u32_t baud_rate; |
| }; |
| |
| struct usart_mcux_lpc_data { |
| /* put irq call back instance when required */ |
| }; |
| |
| 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 unsigned char 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); |
| |
| return 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; |
| } |
| |
| 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_GetFreq(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); |
| |
| 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_USART_MCUX_LPC_0 |
| static const struct usart_mcux_lpc_config usart_mcux_lpc_0_config = { |
| .base = (USART_Type *)CONFIG_USART_MCUX_LPC_0_BASE_ADDRESS, |
| .clock_source = kCLOCK_Flexcomm0, |
| .baud_rate = CONFIG_USART_MCUX_LPC_0_BAUD_RATE, |
| }; |
| |
| static struct usart_mcux_lpc_data usart_mcux_lpc_0_data; |
| |
| DEVICE_AND_API_INIT(usart_0, CONFIG_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); |
| #endif /* CONFIG_USART_MCUX_LPC_0 */ |