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/*
* File : drv_usart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2015, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2015-08-01 xiaonong the first version for stm32f7xx
*/
#include "stm32f7xx.h"
#include "drv_usart.h"
#include "board.h"
#include <rtdevice.h>
/* Definition for USART1 clock resources */
#define USART1_CLK_ENABLE() __USART1_CLK_ENABLE()
#define USART1_RX_GPIO_CLK_ENABLE() __GPIOB_CLK_ENABLE()
#define USART1_TX_GPIO_CLK_ENABLE() __GPIOA_CLK_ENABLE()
#define USART1_FORCE_RESET() __USART1_FORCE_RESET()
#define USART1_RELEASE_RESET() __USART1_RELEASE_RESET()
/* Definition for USARTx Pins */
#define USART1_TX_PIN GPIO_PIN_9
#define USART1_TX_GPIO_PORT GPIOA
#define USART1_TX_AF GPIO_AF7_USART1
#define USART1_RX_PIN GPIO_PIN_7
#define USART1_RX_GPIO_PORT GPIOB
#define USART1_RX_AF GPIO_AF7_USART1
/* STM32 uart driver */
struct stm32_uart
{
UART_HandleTypeDef UartHandle;
IRQn_Type irq;
};
static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct stm32_uart *uart;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
uart->UartHandle.Init.BaudRate = cfg->baud_rate;
uart->UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
uart->UartHandle.Init.Mode = UART_MODE_TX_RX;
uart->UartHandle.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
switch (cfg->data_bits)
{
case DATA_BITS_7:
uart->UartHandle.Init.WordLength = UART_WORDLENGTH_7B;
break;
case DATA_BITS_8:
uart->UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
break;
case DATA_BITS_9:
uart->UartHandle.Init.WordLength = UART_WORDLENGTH_9B;
break;
default:
uart->UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
break;
}
switch (cfg->stop_bits)
{
case STOP_BITS_1:
uart->UartHandle.Init.StopBits = UART_STOPBITS_1;
break;
case STOP_BITS_2:
uart->UartHandle.Init.StopBits = UART_STOPBITS_2;
break;
default:
uart->UartHandle.Init.StopBits = UART_STOPBITS_1;
break;
}
switch (cfg->parity)
{
case PARITY_NONE:
uart->UartHandle.Init.Parity = UART_PARITY_NONE;
break;
case PARITY_ODD:
uart->UartHandle.Init.Parity = UART_PARITY_ODD;
break;
case PARITY_EVEN:
uart->UartHandle.Init.Parity = UART_PARITY_EVEN;
break;
default:
uart->UartHandle.Init.Parity = UART_PARITY_NONE;
break;
}
if (HAL_UART_DeInit(&uart->UartHandle) != HAL_OK)
{
return RT_ERROR;
}
if (HAL_UART_Init(&uart->UartHandle) != HAL_OK)
{
return RT_ERROR;
}
return RT_EOK;
}
static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct stm32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
UART_DISABLE_IRQ(uart->irq);
/* disable interrupt */
__HAL_UART_DISABLE_IT(&uart->UartHandle, UART_IT_RXNE);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
UART_ENABLE_IRQ(uart->irq);
/* enable interrupt */
__HAL_UART_ENABLE_IT(&uart->UartHandle, 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;
while (!(uart->UartHandle.Instance->ISR & UART_FLAG_TXE));
uart->UartHandle.Instance->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->UartHandle.Instance->ISR & UART_FLAG_RXNE)
{
ch = uart->UartHandle.Instance->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 */
static struct stm32_uart uart1;
struct rt_serial_device serial1;
void USART1_IRQHandler(void)
{
struct stm32_uart *uart;
uart = &uart1;
/* enter interrupt */
rt_interrupt_enter();
/* UART in mode Receiver ---------------------------------------------------*/
if ((__HAL_UART_GET_IT(&uart->UartHandle, UART_IT_RXNE) != RESET) && (__HAL_UART_GET_IT_SOURCE(&uart->UartHandle, UART_IT_RXNE) != RESET))
{
rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_RX_IND);
/* Clear RXNE interrupt flag */
__HAL_UART_SEND_REQ(&uart->UartHandle, UART_RXDATA_FLUSH_REQUEST);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART1 */
/**
* @brief UART MSP Initialization
* This function configures the hardware resources used in this example:
* - Peripheral's clock enable
* - Peripheral's GPIO Configuration
* - NVIC configuration for UART interrupt request enable
* @param huart: UART handle pointer
* @retval None
*/
void HAL_UART_MspInit(UART_HandleTypeDef *huart)
{
GPIO_InitTypeDef GPIO_InitStruct;
if (huart->Instance == USART1)
{
/* Enable GPIO TX/RX clock */
USART1_TX_GPIO_CLK_ENABLE();
USART1_RX_GPIO_CLK_ENABLE();
/* Enable USARTx clock */
USART1_CLK_ENABLE();
/* UART TX GPIO pin configuration */
GPIO_InitStruct.Pin = USART1_TX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = USART1_TX_AF;
HAL_GPIO_Init(USART1_TX_GPIO_PORT, &GPIO_InitStruct);
/* UART RX GPIO pin configuration */
GPIO_InitStruct.Pin = USART1_RX_PIN;
GPIO_InitStruct.Alternate = USART1_RX_AF;
HAL_GPIO_Init(USART1_RX_GPIO_PORT, &GPIO_InitStruct);
/* NVIC for USART */
HAL_NVIC_SetPriority(USART1_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(USART1_IRQn);
}
}
/**
* @brief UART MSP De-Initialization
* This function frees the hardware resources used in this example:
* - Disable the Peripheral's clock
* - Revert GPIO and NVIC configuration to their default state
* @param huart: UART handle pointer
* @retval None
*/
void HAL_UART_MspDeInit(UART_HandleTypeDef *huart)
{
if (huart->Instance == USART1)
{
/* Reset peripherals */
USART1_FORCE_RESET();
USART1_RELEASE_RESET();
/* Disable peripherals and GPIO Clocks */
/* Configure UART Tx as alternate function */
HAL_GPIO_DeInit(USART1_TX_GPIO_PORT, USART1_TX_PIN);
/* Configure UART Rx as alternate function */
HAL_GPIO_DeInit(USART1_RX_GPIO_PORT, USART1_RX_PIN);
/* Disable the NVIC for UART */
HAL_NVIC_DisableIRQ(USART1_IRQn);
}
}
int stm32_hw_usart_init(void)
{
struct stm32_uart *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef RT_USING_UART1
uart = &uart1;
uart->UartHandle.Instance = USART1;
serial1.ops = &stm32_uart_ops;
serial1.config = config;
/* register UART1 device */
rt_hw_serial_register(&serial1, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
#endif /* RT_USING_UART1 */
return 0;
}
INIT_BOARD_EXPORT(stm32_hw_usart_init);
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