85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/*
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* Copyright (c) 2020 Linumiz
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* Author: Parthiban Nallathambi <parthiban@linumiz.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT infineon_xmc4xxx_uart
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#include <xmc_gpio.h>
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#include <xmc_uart.h>
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#include <zephyr/drivers/uart.h>
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struct uart_xmc4xx_config {
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XMC_USIC_CH_t *uart;
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};
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struct uart_xmc4xxx_data {
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XMC_UART_CH_CONFIG_t config;
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};
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static int uart_xmc4xxx_poll_in(const struct device *dev, unsigned char *c)
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{
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const struct uart_xmc4xx_config *config = dev->config;
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if (!XMC_USIC_CH_GetReceiveBufferStatus(config->uart)) {
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return -1;
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}
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*c = (unsigned char)XMC_UART_CH_GetReceivedData(config->uart);
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return 0;
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}
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static void uart_xmc4xxx_poll_out(const struct device *dev, unsigned char c)
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{
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const struct uart_xmc4xx_config *config = dev->config;
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XMC_UART_CH_Transmit(config->uart, c);
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}
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static int uart_xmc4xxx_init(const struct device *dev)
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{
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const struct uart_xmc4xx_config *config = dev->config;
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struct uart_xmc4xxx_data *data = dev->data;
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data->config.data_bits = 8U;
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data->config.stop_bits = 1U;
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/* configure PIN 0.0 and 0.1 as UART */
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XMC_UART_CH_Init(config->uart, &(data->config));
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XMC_GPIO_SetMode(P0_0, XMC_GPIO_MODE_INPUT_TRISTATE);
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XMC_UART_CH_SetInputSource(config->uart, XMC_UART_CH_INPUT_RXD,
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USIC1_C1_DX0_P0_0);
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XMC_UART_CH_Start(config->uart);
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XMC_GPIO_SetMode(P0_1,
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XMC_GPIO_MODE_OUTPUT_PUSH_PULL | P0_1_AF_U1C1_DOUT0);
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return 0;
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}
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static const struct uart_driver_api uart_xmc4xxx_driver_api = {
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.poll_in = uart_xmc4xxx_poll_in,
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.poll_out = uart_xmc4xxx_poll_out,
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};
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#define XMC4XXX_INIT(index) \
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static struct uart_xmc4xxx_data xmc4xxx_data_##index = { \
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.config.baudrate = DT_INST_PROP(index, current_speed) \
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}; \
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\
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static const struct uart_xmc4xx_config xmc4xxx_config_##index = { \
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.uart = (XMC_USIC_CH_t *)DT_INST_REG_ADDR(index), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(index, &uart_xmc4xxx_init, \
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NULL, \
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&xmc4xxx_data_##index, \
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&xmc4xxx_config_##index, PRE_KERNEL_1, \
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CONFIG_SERIAL_INIT_PRIORITY, \
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&uart_xmc4xxx_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(XMC4XXX_INIT)
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