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/*
* File : usart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006-2013, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2016-08-30 Aubr.Cool the first version
*/
#include <stm32l0xx.h>
#include <rtdevice.h>
#include <board.h>
#include "usart.h"
/* USART1 */
#ifdef RT_USING_UART1
#define UART1_GPIO GPIOA
#endif
/* STM32 uart driver */
struct stm32_uart
{
USART_TypeDef* uart_device;
IRQn_Type irq;
};
typedef struct {
USART_TypeDef *Instance;
} stm32_hw_uart_def;
static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
UART_HandleTypeDef huart1;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
struct stm32_uart* uart;
uart = (struct stm32_uart *)serial->parent.user_data;
huart1.Instance = uart->uart_device;
huart1.Init.BaudRate = cfg->baud_rate;
switch(cfg->data_bits) {
case DATA_BITS_7:
if(!cfg->parity) {
huart1.Init.WordLength = UART_WORDLENGTH_7B;
} else {
huart1.Init.WordLength = UART_WORDLENGTH_8B;
}
break;
case DATA_BITS_8:
if(!cfg->parity) {
huart1.Init.WordLength = UART_WORDLENGTH_8B;
} else {
huart1.Init.WordLength = UART_WORDLENGTH_9B;
}
break;
case DATA_BITS_9:
if(!cfg->parity) {
huart1.Init.WordLength = UART_WORDLENGTH_9B;
} else {
return RT_EIO;
}
break;
default:
return RT_EIO;
}
switch(cfg->stop_bits) {
case STOP_BITS_1:
huart1.Init.StopBits = UART_STOPBITS_1;
break;
case STOP_BITS_2:
huart1.Init.StopBits = UART_STOPBITS_2;
break;
default:
return RT_EIO;
}
switch(cfg->parity) {
case PARITY_NONE:
huart1.Init.Parity = UART_PARITY_NONE;
break;
case PARITY_ODD:
huart1.Init.Parity = UART_PARITY_ODD;
break;
case PARITY_EVEN:
huart1.Init.Parity = UART_PARITY_EVEN;
break;
default:
return RT_EIO;
}
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
return RT_EIO;
}
return RT_EOK;
}
static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct stm32_uart* uart;
stm32_hw_uart_def huart1;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
huart1.Instance = uart->uart_device;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
__HAL_UART_DISABLE_IT((&huart1), UART_IT_RXNE);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
__HAL_UART_ENABLE_IT((&huart1), UART_IT_RXNE);
break;
}
return RT_EOK;
}
static int stm32_putc(struct rt_serial_device *serial, char c)
{
struct stm32_uart* uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
stm32_hw_uart_def huart1;
huart1.Instance = uart->uart_device;
if(serial->parent.open_flag & RT_DEVICE_FLAG_INT_TX) {
if(!(uart->uart_device->ISR & UART_FLAG_TXE)) {
__HAL_UART_ENABLE_IT((&huart1), UART_IT_TC);
return -1;
}
uart->uart_device->TDR = c;
__HAL_UART_ENABLE_IT((&huart1), UART_IT_TC);
} else {
while(!(uart->uart_device->ISR & UART_FLAG_TXE));
uart->uart_device->TDR = c;
}
return 1;
}
static int stm32_getc(struct rt_serial_device *serial)
{
int ch;
struct stm32_uart* uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
ch = -1;
if (uart->uart_device->ISR & UART_FLAG_RXNE)
{
ch = uart->uart_device->RDR & 0xff;
}
return ch;
}
static const struct rt_uart_ops stm32_uart_ops =
{
stm32_configure,
stm32_control,
stm32_putc,
stm32_getc,
};
#if defined(RT_USING_UART1)
/* UART1 device driver structure */
struct stm32_uart uart1 =
{
USART1,
USART1_IRQn,
};
struct rt_serial_device serial1;
void USART1_IRQHandler(void)
{
struct stm32_uart* uart;
uart = &uart1;
stm32_hw_uart_def huart1;
huart1.Instance = uart->uart_device;
/* enter interrupt */
rt_interrupt_enter();
if(__HAL_UART_GET_IT(&huart1, UART_IT_RXNE))// RXIRQ
{
rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_RX_IND);
}
if (__HAL_UART_GET_IT(&huart1, UART_IT_TC))
{
/* clear interrupt */
__HAL_UART_DISABLE_IT((&huart1), UART_IT_TC);
__HAL_UART_CLEAR_IT(&huart1, UART_CLEAR_TCF);
rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_TX_DONE);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART1 */
static void RCC_Configuration(void)
{
#ifdef RT_USING_UART1
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_USART1_CLK_ENABLE();
#endif /* RT_USING_UART1 */
}
static void GPIO_Configuration(void)
{
#ifdef RT_USING_UART1
{
rt_uint32_t mode;
mode = (UART1_GPIO_AF << 8) | GPIO_MODE_AF_PP;
stm32_pin_mode_early(UART1_GPIO_TX, mode);
stm32_pin_mode_early(UART1_GPIO_RX, mode);
}
#endif /* RT_USING_UART1 */
}
static void NVIC_Configuration(struct stm32_uart* uart)
{
HAL_NVIC_SetPriority(uart->irq, 0, 0);
UART_ENABLE_IRQ(uart->irq);
}
int rt_hw_usart_init(void)
{
struct stm32_uart* uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
RCC_Configuration();
GPIO_Configuration();
#ifdef RT_USING_UART1
uart = &uart1;
config.baud_rate = BAUD_RATE_115200;
serial1.ops = &stm32_uart_ops;
serial1.config = config;
NVIC_Configuration(&uart1);
/* register UART1 device */
rt_hw_serial_register(&serial1, "uart1",
RT_DEVICE_FLAG_RDWR |
RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX,
uart);
#endif /* RT_USING_UART1 */
return 0;
}
INIT_BOARD_EXPORT(rt_hw_usart_init);
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