321 lines
8.3 KiB
C
321 lines
8.3 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 and LPC55xxx families.
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*
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* Note:
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* - The driver is implemented for only one device, multiple instances
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* will be implemented in the future.
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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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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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void (*irq_config_func)(struct device *dev);
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#endif
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};
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struct usart_mcux_lpc_data {
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_callback_user_data_t callback;
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void *cb_data;
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#endif
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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 void 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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}
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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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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static int usart_mcux_lpc_fifo_fill(struct device *dev, const u8_t *tx_data,
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int len)
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{
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const struct usart_mcux_lpc_config *config = dev->config->config_info;
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u8_t num_tx = 0U;
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while ((len - num_tx > 0) &&
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(USART_GetStatusFlags(config->base)
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& kUSART_TxFifoNotFullFlag)) {
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USART_WriteByte(config->base, tx_data[num_tx++]);
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}
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return num_tx;
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}
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static int usart_mcux_lpc_fifo_read(struct device *dev, u8_t *rx_data,
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const int len)
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{
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const struct usart_mcux_lpc_config *config = dev->config->config_info;
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u8_t num_rx = 0U;
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while ((len - num_rx > 0) &&
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(USART_GetStatusFlags(config->base)
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& kUSART_RxFifoNotEmptyFlag)) {
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rx_data[num_rx++] = USART_ReadByte(config->base);
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}
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return num_rx;
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}
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static void usart_mcux_lpc_irq_tx_enable(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 mask = kUSART_TxLevelInterruptEnable;
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USART_EnableInterrupts(config->base, mask);
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}
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static void usart_mcux_lpc_irq_tx_disable(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 mask = kUSART_TxLevelInterruptEnable;
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USART_DisableInterrupts(config->base, mask);
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}
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static int usart_mcux_lpc_irq_tx_complete(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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return (flags & kUSART_TxFifoEmptyFlag) != 0U;
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}
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static int usart_mcux_lpc_irq_tx_ready(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 mask = kUSART_TxLevelInterruptEnable;
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return (USART_GetEnabledInterrupts(config->base) & mask)
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&& usart_mcux_lpc_irq_tx_complete(dev);
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}
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static void usart_mcux_lpc_irq_rx_enable(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 mask = kUSART_RxLevelInterruptEnable;
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USART_EnableInterrupts(config->base, mask);
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}
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static void usart_mcux_lpc_irq_rx_disable(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 mask = kUSART_RxLevelInterruptEnable;
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USART_DisableInterrupts(config->base, mask);
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}
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static int usart_mcux_lpc_irq_rx_full(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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return (flags & kUSART_RxFifoNotEmptyFlag) != 0U;
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}
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static int usart_mcux_lpc_irq_rx_ready(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 mask = kUSART_RxLevelInterruptEnable;
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return (USART_GetEnabledInterrupts(config->base) & mask)
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&& usart_mcux_lpc_irq_rx_full(dev);
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}
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static void usart_mcux_lpc_irq_err_enable(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 mask = kStatus_USART_NoiseError |
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kStatus_USART_FramingError |
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kStatus_USART_ParityError;
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USART_EnableInterrupts(config->base, mask);
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}
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static void usart_mcux_lpc_irq_err_disable(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 mask = kStatus_USART_NoiseError |
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kStatus_USART_FramingError |
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kStatus_USART_ParityError;
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USART_DisableInterrupts(config->base, mask);
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}
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static int usart_mcux_lpc_irq_is_pending(struct device *dev)
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{
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return (usart_mcux_lpc_irq_tx_ready(dev)
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|| usart_mcux_lpc_irq_rx_ready(dev));
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}
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static int usart_mcux_lpc_irq_update(struct device *dev)
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{
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return 1;
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}
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static void usart_mcux_lpc_irq_callback_set(struct device *dev,
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uart_irq_callback_user_data_t cb,
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void *cb_data)
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{
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struct usart_mcux_lpc_data *data = dev->driver_data;
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data->callback = cb;
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data->cb_data = cb_data;
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}
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static void usart_mcux_lpc_isr(void *arg)
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{
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struct device *dev = arg;
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struct usart_mcux_lpc_data *data = dev->driver_data;
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if (data->callback) {
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data->callback(data->cb_data);
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}
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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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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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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config->irq_config_func(dev);
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#endif
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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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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.fifo_fill = usart_mcux_lpc_fifo_fill,
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.fifo_read = usart_mcux_lpc_fifo_read,
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.irq_tx_enable = usart_mcux_lpc_irq_tx_enable,
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.irq_tx_disable = usart_mcux_lpc_irq_tx_disable,
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.irq_tx_complete = usart_mcux_lpc_irq_tx_complete,
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.irq_tx_ready = usart_mcux_lpc_irq_tx_ready,
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.irq_rx_enable = usart_mcux_lpc_irq_rx_enable,
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.irq_rx_disable = usart_mcux_lpc_irq_rx_disable,
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.irq_rx_ready = usart_mcux_lpc_irq_rx_ready,
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.irq_err_enable = usart_mcux_lpc_irq_err_enable,
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.irq_err_disable = usart_mcux_lpc_irq_err_disable,
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.irq_is_pending = usart_mcux_lpc_irq_is_pending,
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.irq_update = usart_mcux_lpc_irq_update,
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.irq_callback_set = usart_mcux_lpc_irq_callback_set,
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#endif
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};
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#ifdef CONFIG_USART_MCUX_LPC_0
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void usart_mcux_lpc_config_func_0(struct device *dev);
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#endif
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static const struct usart_mcux_lpc_config usart_mcux_lpc_0_config = {
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.base = (USART_Type *)DT_USART_MCUX_LPC_0_BASE_ADDRESS,
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.clock_source = kCLOCK_Flexcomm0,
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.baud_rate = DT_USART_MCUX_LPC_0_BAUD_RATE,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = usart_mcux_lpc_config_func_0,
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#endif
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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, DT_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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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void usart_mcux_lpc_config_func_0(struct device *dev)
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{
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IRQ_CONNECT(DT_USART_MCUX_LPC_0_IRQ,
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DT_USART_MCUX_LPC_0_IRQ_PRI,
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usart_mcux_lpc_isr, DEVICE_GET(usart_0), 0);
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irq_enable(DT_USART_MCUX_LPC_0_IRQ);
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}
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#endif
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#endif /* CONFIG_USART_MCUX_LPC_0 */
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