127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/*
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* Copyright (c) 2017, NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/** @file
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* @brief USART driver for LPC54XXX family
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*
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* Note:
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* - Only basic USART features sufficient to support printf functionality
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* are currently implemented.
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* - The driver works only in polling mode, interrupt mode is not implemented.
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*/
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#include <errno.h>
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#include <device.h>
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#include <uart.h>
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#include <fsl_usart.h>
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#include <fsl_clock.h>
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#include <soc.h>
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#include <fsl_device_registers.h>
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struct usart_mcux_lpc_config {
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USART_Type *base;
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clock_name_t clock_source;
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u32_t baud_rate;
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};
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struct usart_mcux_lpc_data {
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/* put irq call back instance when required */
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};
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static int usart_mcux_lpc_poll_in(struct device *dev, unsigned char *c)
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{
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const struct usart_mcux_lpc_config *config = dev->config->config_info;
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u32_t flags = USART_GetStatusFlags(config->base);
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int ret = -1;
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if (flags & kUSART_RxFifoFullFlag) {
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*c = USART_ReadByte(config->base);
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ret = 0;
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}
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return ret;
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}
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static unsigned char usart_mcux_lpc_poll_out(struct device *dev,
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unsigned char c)
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{
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const struct usart_mcux_lpc_config *config = dev->config->config_info;
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/* Wait until space is available in TX FIFO */
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while (!(USART_GetStatusFlags(config->base) & kUSART_TxFifoEmptyFlag))
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;
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USART_WriteByte(config->base, c);
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return c;
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}
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static int usart_mcux_lpc_err_check(struct device *dev)
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{
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const struct usart_mcux_lpc_config *config = dev->config->config_info;
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u32_t flags = USART_GetStatusFlags(config->base);
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int err = 0;
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if (flags & kStatus_USART_RxRingBufferOverrun) {
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err |= UART_ERROR_OVERRUN;
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}
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if (flags & kStatus_USART_ParityError) {
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err |= UART_ERROR_PARITY;
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}
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if (flags & kStatus_USART_FramingError) {
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err |= UART_ERROR_FRAMING;
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}
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USART_ClearStatusFlags(config->base,
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kStatus_USART_RxRingBufferOverrun |
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kStatus_USART_ParityError |
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kStatus_USART_FramingError);
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return err;
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}
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static int usart_mcux_lpc_init(struct device *dev)
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{
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const struct usart_mcux_lpc_config *config = dev->config->config_info;
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usart_config_t usart_config;
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u32_t clock_freq;
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clock_freq = CLOCK_GetFreq(config->clock_source);
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USART_GetDefaultConfig(&usart_config);
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usart_config.enableTx = true;
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usart_config.enableRx = true;
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usart_config.baudRate_Bps = config->baud_rate;
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USART_Init(config->base, &usart_config, clock_freq);
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return 0;
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}
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static const struct uart_driver_api usart_mcux_lpc_driver_api = {
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.poll_in = usart_mcux_lpc_poll_in,
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.poll_out = usart_mcux_lpc_poll_out,
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.err_check = usart_mcux_lpc_err_check,
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};
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#ifdef CONFIG_USART_MCUX_LPC_0
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static const struct usart_mcux_lpc_config usart_mcux_lpc_0_config = {
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.base = (USART_Type *)CONFIG_USART_MCUX_LPC_0_BASE_ADDRESS,
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.clock_source = kCLOCK_Flexcomm0,
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.baud_rate = CONFIG_USART_MCUX_LPC_0_BAUD_RATE,
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};
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static struct usart_mcux_lpc_data usart_mcux_lpc_0_data;
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DEVICE_AND_API_INIT(usart_0, CONFIG_USART_MCUX_LPC_0_NAME,
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&usart_mcux_lpc_init,
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&usart_mcux_lpc_0_data, &usart_mcux_lpc_0_config,
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PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&usart_mcux_lpc_driver_api);
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#endif /* CONFIG_USART_MCUX_LPC_0 */
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