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rt-thread/bsp/stm32f20x/Drivers/usart.c

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/*
* File : usart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2009, 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
* 2009-01-05 Bernard the first version
* 2010-03-29 Bernard remove interrupt Tx and DMA Rx mode
*/
#include "usart.h"
#include <serial.h>
#include <stm32f2xx.h>
#include <stm32f2xx_dma.h>
/*
* Use UART1 as console output and finsh input
* interrupt Rx and poll Tx (stream mode)
*
* Use UART2 with interrupt Rx and poll Tx
* Use UART3 with DMA Tx and interrupt Rx -- DMA channel 2
*
* USART DMA setting on STM32
* USART1 Tx --> DMA Channel 4
* USART1 Rx --> DMA Channel 5
* USART2 Tx --> DMA Channel 7
* USART2 Rx --> DMA Channel 6
* USART3 Tx --> DMA Channel 2
* USART3 Rx --> DMA Channel 3
*/
#ifdef RT_USING_UART1
struct stm32_serial_int_rx uart1_int_rx;
struct stm32_serial_device uart1 =
{
USART1,
&uart1_int_rx,
RT_NULL
};
struct rt_device uart1_device;
#endif
#ifdef RT_USING_UART6
struct stm32_serial_int_rx uart6_int_rx;
struct stm32_serial_device uart6 =
{
USART6,
&uart6_int_rx,
RT_NULL
};
struct rt_device uart6_device;
#endif
#ifdef RT_USING_UART2
struct stm32_serial_int_rx uart2_int_rx;
struct stm32_serial_device uart2 =
{
USART2,
&uart2_int_rx,
RT_NULL
};
struct rt_device uart2_device;
#endif
#ifdef RT_USING_UART3
struct stm32_serial_int_rx uart3_int_rx;
struct stm32_serial_dma_tx uart3_dma_tx;
struct stm32_serial_device uart3 =
{
USART3,
&uart3_int_rx,
&uart3_dma_tx
};
struct rt_device uart3_device;
#endif
#define USART1_DR_Base 0x40013804
#define USART2_DR_Base 0x40004404
#define USART3_DR_Base 0x40004804
/* USART1_REMAP = 0 */
#define UART1_GPIO_TX GPIO_Pin_9
#define UART1_GPIO_RX GPIO_Pin_10
#define UART1_GPIO GPIOA
#define RCC_APBPeriph_UART1 RCC_APB2Periph_USART1
#define UART1_TX_DMA DMA1_Channel4
#define UART1_RX_DMA DMA1_Channel5
#if defined(STM32F10X_LD) || defined(STM32F10X_MD) || defined(STM32F10X_CL)
#define UART2_GPIO_TX GPIO_Pin_5
#define UART2_GPIO_RX GPIO_Pin_6
#define UART2_GPIO GPIOD
#define RCC_APBPeriph_UART2 RCC_APB1Periph_USART2
#else /* for STM32F10X_HD */
/* USART2_REMAP = 0 */
#define UART2_GPIO_TX GPIO_Pin_2
#define UART2_GPIO_RX GPIO_Pin_3
#define UART2_GPIO GPIOA
#define RCC_APBPeriph_UART2 RCC_APB1Periph_USART2
#define UART2_TX_DMA DMA1_Channel7
#define UART2_RX_DMA DMA1_Channel6
#endif
/* USART3_REMAP[1:0] = 00 */
#define UART3_GPIO_RX GPIO_Pin_11
#define UART3_GPIO_TX GPIO_Pin_10
#define UART3_GPIO GPIOB
#define RCC_APBPeriph_UART3 RCC_APB1Periph_USART3
#define UART3_TX_DMA DMA1_Channel2
#define UART3_RX_DMA DMA1_Channel3
/* USART6_REMAP = 0 */
#define UART6_GPIO_TX GPIO_Pin_6
#define UART6_GPIO_RX GPIO_Pin_7
#define UART6_GPIO GPIOC
#define RCC_APBPeriph_UART6 RCC_APB2Periph_USART6
//#define UART1_TX_DMA DMA1_Channel?
//#define UART1_RX_DMA DMA1_Channel?
static void RCC_Configuration(void)
{
#ifdef RT_USING_UART1
/* Enable USART1 and GPIOA clocks */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
#endif
#ifdef RT_USING_UART6
/* Enable USART6 and GPIOC clocks */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6, ENABLE);
#endif
}
static void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
#ifdef RT_USING_UART1
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_9|GPIO_Pin_10;
GPIO_Init(GPIOA,&GPIO_InitStruct);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
#endif
#ifdef RT_USING_UART6
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Pin=UART6_GPIO_TX|UART6_GPIO_RX;
GPIO_Init(UART6_GPIO,&GPIO_InitStruct);
GPIO_PinAFConfig(UART6_GPIO, GPIO_PinSource6, GPIO_AF_USART6);
GPIO_PinAFConfig(UART6_GPIO, GPIO_PinSource7, GPIO_AF_USART6);
#endif
}
static void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef RT_USING_UART1
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif
#ifdef RT_USING_UART6
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif
}
/*
* Init all related hardware in here
* rt_hw_serial_init() will register all supported USART device
*/
void rt_hw_usart_init()
{
USART_InitTypeDef USART_InitStructure;
RCC_Configuration();
GPIO_Configuration();
NVIC_Configuration();
/* uart init */
#ifdef RT_USING_UART1
USART_DeInit(USART1);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
/* register uart1 */
rt_hw_serial_register(&uart1_device, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart1);
/* enable interrupt */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
/* Enable USART1 */
USART_Cmd(USART1, ENABLE);
USART_ClearFlag(USART1,USART_FLAG_TXE);
#endif
/* uart init */
#ifdef RT_USING_UART6
USART_DeInit(USART6);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART6, &USART_InitStructure);
/* register uart1 */
rt_hw_serial_register(&uart6_device, "uart6",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart6);
/* enable interrupt */
USART_ITConfig(USART6, USART_IT_RXNE, ENABLE);
/* Enable USART6 */
USART_Cmd(USART6, ENABLE);
USART_ClearFlag(USART6,USART_FLAG_TXE);
#endif
}
#ifdef RT_USING_UART1
void USART1_IRQHandler()
{
/* enter interrupt */
rt_interrupt_enter();
rt_hw_serial_isr(&uart1_device);
/* leave interrupt */
rt_interrupt_leave();
}
#endif
#ifdef RT_USING_UART6
void USART6_IRQHandler()
{
/* enter interrupt */
rt_interrupt_enter();
rt_hw_serial_isr(&uart6_device);
/* leave interrupt */
rt_interrupt_leave();
}
#endif
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