STM32F407 USART +DMA共思路DMA通道,进行数据转发

发布时间：2024-11-21

/**

****************************************************************************** * @file IO_Toggle/main.c

* @author MCD Application Team

* @version V1.0.0

* @date 19-September-2011

* @brief Main program body

****************************************************************************** * @attention

*

* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS

* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE

* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY

* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING

* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE

* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.

*

* <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>

****************************************************************************** */

/* Includes ------------------------------------------------------------------*/

#include "stm32f4xx.h"

//串口1连接电脑的USB-TTL小板子，串口2连接MAX485

/* Private typedef -----------------------------------------------------------*/

#define TX_MODE 0

#define RX_MODE 1

unsigned long boundrate[7]={600,2400,4800,9600,19200,38400,57600};

/* Private variables ---------------------------------------------------------*/

__IO unsigned char uart_rx_tx_buf[2];

USART_InitTypeDef USART_InitStruct;

DMA_InitTypeDef DMA_InitStruct;

GPIO_InitTypeDef GPIO_InitStruct;

NVIC_InitTypeDef NVIC_InitStructure;

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/**

* @brief Main program

* @param None

* @retval None

*/

void uart_1_dma_init(void);

void uart_2_dma_init(void);

void Set485Mode(unsigned char flag);

void Set_1_rate(unsigned char rate_num);

void Set_2_rate(unsigned char rate_num);

void _485PinConfig(void);

int main(void)

{

uart_1_dma_init();

uart_2_dma_init();

Set485Mode(TX_MODE);

while(1);

}

void uart_1_dma_init(void)

{

/* Enable uart1, DMA2 and GPIO clocks ****************************************/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOB, ENABLE); //B6-TX, B7-RX;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

/***********************uart1 initial****************************************/ USART_http://ART_BaudRate=9600;

USART_http://ART_HardwareFlowControl=USART_HardwareFlowControl_None; USART_http://ART_Mode=USART_Mode_Rx |USART_Mode_Tx;

USART_http://ART_Parity=USART_Parity_No;

USART_http://ART_StopBits=USART_StopBits_1;

USART_http://ART_WordLength=USART_WordLength_8b;

USART_Init(USART1,&USART_InitStruct);

/***************GPIO**************************************************/ GPIO_PinAFConfig(GPIOB,GPIO_PinSource6,GPIO_AF_USART1);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource7,GPIO_AF_USART1);

GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;

GPIO_InitStruct.GPIO_Pin=GPIO_Pin_6 |GPIO_Pin_7;

GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_NOPULL;

GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOB,&GPIO_InitStruct);

/* DMA2 Stream0 channel0 configuration **************************************/ DMA_InitStruct.DMA_Channel = DMA_Channel_4;

DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&(USART1->DR));

DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)uart_rx_tx_buf;

DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;

DMA_InitStruct.DMA_BufferSize = 2;

DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;

DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;

DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;

DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;

DMA_InitStruct.DMA_Priority = DMA_Priority_High;

DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;

DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;

DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA2_Stream2, &DMA_InitStruct);

DMA_InitStruct.DMA_Channel = DMA_Channel_4;

DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&(USART1->DR));

DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)uart_rx_tx_buf;

DMA_InitStruct.DMA_DIR = DMA_DIR_MemoryToPeripheral;

DMA_InitStruct.DMA_BufferSize = 2;

DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;

DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;

DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;

DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;

DMA_InitStruct.DMA_Priority = DMA_Priority_High;

DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;

DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;

DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA2_Stream7, &DMA_InitStruct);

/**********************DMA interrupt************************/

DMA_ITConfig(DMA2_Stream7,DMA_IT_TC,ENABLE);

DMA_ITConfig(DMA2_Stream2,DMA_IT_TC,ENABLE);

NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream7_IRQn;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x00;

NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01;

NVIC_Init(&NVIC_InitStructure);

/**********************start*********************************/

DMA_Cmd(DMA2_Stream7, DISABLE); //不使能DMA对于USART1的发送功能 DMA_Cmd(DMA2_Stream2, ENABLE); //使能DMA对于USART1的接收功能 USART_DMACmd(USART1,USART_DMAReq_Rx |USART_DMAReq_Tx,ENABLE); USART_Cmd(USART1,ENABLE);

}

void uart_2_dma_init(void)

{

/* Enable uart1, DMA2 and GPIO clocks ****************************************/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1 | RCC_AHB1Periph_GPIOA, ENABLE); // A2-TX,A3-RX

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

/***********************uart1 initial****************************************/ USART_http://ART_BaudRate=9600;

USART_http://ART_HardwareFlowControl=USART_HardwareFlowControl_None; USART_http://ART_Mode=USART_Mode_Rx |USART_Mode_Tx;

USART_http://ART_Parity=USART_Parity_No;

USART_http://ART_StopBits=USART_StopBits_1;

USART_http://ART_WordLength=USART_WordLength_8b;

USART_Init(USART2,&USART_InitStruct);

/***************GPIO**************************************************/ GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;

GPIO_InitStruct.GPIO_Pin=GPIO_Pin_2 |GPIO_Pin_3;

GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_NOPULL;

GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStruct);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);

/* DMA2 Stream0 channel0 configuration **************************************/ DMA_InitStruct.DMA_Channel = DMA_Channel_4;

DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&(USART2->DR));

DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)uart_rx_tx_buf;

DMA_InitStruct.DMA_DIR = DMA_DIR_MemoryToPeripheral;

DMA_InitStruct.DMA_BufferSize = 2;

DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;

DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;

DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;

DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;

DMA_InitStruct.DMA_Priority = DMA_Priority_High;

DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;

DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;

DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA1_Stream6, &DMA_InitStruct);

DMA_InitStruct.DMA_Channel = DMA_Channel_4;

DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&(USART2->DR));

DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)uart_rx_tx_buf;

DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;

DMA_InitStruct.DMA_BufferSize = 2;

DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;

DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;

DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;

DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;

DMA_InitStruct.DMA_Priority = DMA_Priority_High;

DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;

DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;

DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA1_Stream5, &DMA_InitStruct);

/**********************DMA interrupt************************/

DMA_ITConfig(DMA1_Stream5,DMA_IT_TC,ENABLE);

DMA_ITConfig(DMA1_Stream6,DMA_IT_TC,ENABLE);

NVIC_InitStructure.NVIC_IRQChannel=DMA1_Stream5_IRQn;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x00;

NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel=DMA1_Stream6_IRQn;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01;

NVIC_Init(&NVIC_InitStructure);

/**********************start*********************************/

DMA_Cmd(DMA1_Stream5, ENABLE); //使能USART2的串口接收DMA

DMA_Cmd(DMA1_Stream6, DISABLE); //不使能USART2的串口发送DMA

USART_DMACmd(USART2,USART_DMAReq_Rx |USART_DMAReq_Tx,ENABLE); USART_Cmd(USART2,ENABLE);

}

void DMA2_Stream2_IRQHandler(void) //串口1接收到了数据。即：电脑发数据了 {

if(DMA_GetITStatus(DMA2_Stream2,DMA_IT_TCIF2)==SET)

{

DMA_ClearFlag(DMA2_Stream2,DMA_FLAG_TCIF2);

if(uart_rx_tx_buf[0]=='C')

{

Set_1_rate(uart_rx_tx_buf[1]);

}

DMA_Cmd(DMA1_Stream6, ENABLE); //使能USART2的串口发送DMA

}

}

void DMA2_Stream7_IRQHandler(void)

{

if(DMA_GetITStatus(DMA2_Stream7,DMA_IT_TCIF7)==SET) //串口1发送完数据

{

DMA_ClearFlag(DMA2_Stream7,DMA_FLAG_TCIF7);

DMA_Cmd(DMA2_Stream7, DISABLE); //不使能DMA对于USART1的发送功能

}

}

void DMA1_Stream5_IRQHandler(void) //串口2接收数据完成,即：8051向串口2发送数据

{

if(DMA_GetITStatus(DMA1_Stream5,DMA_IT_TCIF5)==SET)

{

DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);

DMA_Cmd(DMA2_Stream7, ENABLE); //使能DMA对于USART1的发送功能

}

}

void DMA1_Stream6_IRQHandler(void) //串口2发送数据完成,即：发送到8051 {

if(DMA_GetITStatus(DMA1_Stream6,DMA_IT_TCIF6)==SET)

{

DMA_ClearFlag(DMA1_Stream6,DMA_FLAG_TCIF6);

if(uart_rx_tx_buf[0]=='C')

{

Set_2_rate(uart_rx_tx_buf[1]);

}

else if(uart_rx_tx_buf[0]=='R' &&uart_rx_tx_buf[1]=='D')

{

Set485Mode(RX_MODE);

}

DMA_Cmd(DMA1_Stream6, DISABLE); //关闭USART2的串口发送DMA

}

}

void Set_1_rate(unsigned char rate_num)

{

USART_http://ART_BaudRate=boundrate[rate_num];

USART_http://ART_HardwareFlowControl=USART_HardwareFlowControl_None; USART_http://ART_Mode=USART_Mode_Rx |USART_Mode_Tx;

USART_http://ART_Parity=USART_Parity_No;

USART_http://ART_StopBits=USART_StopBits_1;

USART_http://ART_WordLength=USART_WordLength_8b;

USART_Init(USART1,&USART_InitStruct);

}

void Set_2_rate(unsigned char rate_num)

{

USART_http://ART_BaudRate=boundrate[rate_num];

USART_http://ART_HardwareFlowControl=USART_HardwareFlowControl_None; USART_http://ART_Mode=USART_Mode_Rx |USART_Mode_Tx;

USART_http://ART_Parity=USART_Parity_No;

USART_http://ART_StopBits=USART_StopBits_1;

USART_http://ART_WordLength=USART_WordLength_8b;

USART_Init(USART2,&USART_InitStruct);

}

void Set485Mode(unsigned char flag)

{

if(flag==RX_MODE)

GPIO_ResetBits(GPIOC,GPIO_Pin_1);

else if(flag==TX_MODE)

GPIO_SetBits(GPIOC,GPIO_Pin_1);

}

void _485PinConfig(void) //PC1作为485控制引脚

{

GPIO_InitStruct.GPIO_Mode=GPIO_Mode_OUT;

GPIO_InitStruct.GPIO_Pin=GPIO_Pin_1;

GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_NOPULL;

GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOC,&GPIO_InitStruct);

}

#ifdef USE_FULL_ASSERT

/**

* @brief Reports the name of the source file and the source line number

* where the assert_param error has occurred.

* @param file: pointer to the source file name

* @param line: assert_param error line source number

* @retval None

*/

void assert_failed(uint8_t* file, uint32_t line)

{

/* User can add his own implementation to report the file name and line number,

ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

while (1)

{}

}

#endif

/**

* @}

*/

/**

* @}

*/

/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/

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