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| #include "stm32f4xx.h"
#include <stm32f4xx_rcc.h>
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_dma.h"
#include "stm32f4xx_usart.h"
#include <stm32f4xx_dac.h>
unsigned char buffer[129];
uint8_t Recieve_buf[256];
uint8_t Recieve_W=0, Recieve_R=0, Recieve_C=0;
void USART3_Init(void){
GPIO_InitTypeDef GPIOC_10_11_InitStructure;
USART_InitTypeDef USART3_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);
GPIOC_10_11_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIOC_10_11_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIOC_10_11_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIOC_10_11_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIOC_10_11_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIOC_10_11_InitStructure);
//USART Init
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
USART3_InitStructure.USART_BaudRate = 9600;
USART3_InitStructure.USART_WordLength = USART_WordLength_8b;
USART3_InitStructure.USART_StopBits = USART_StopBits_1;
USART3_InitStructure.USART_Parity = USART_Parity_No;
USART3_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART3_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART3, &USART3_InitStructure);
USART_Cmd(USART3, ENABLE);
}
void DMAStream3_Channel4_Init(void){
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_InitTypeDef DMA_InitStruct;
DMA_StructInit(&DMA_InitStruct);
DMA_InitStruct.DMA_Channel = DMA_Channel_4;
DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&(USART3->DR);
DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)&Recieve_buf;
DMA_InitStruct.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStruct.DMA_BufferSize = 129;
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_Medium;
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_Stream3, &DMA_InitStruct);
}
void USART2_IRQHandler(void){
if (USART_GetITStatus(USART2, USART_IT_RXNE) == SET)
{
USART_ClearITPendingBit(USART2, USART_IT_RXNE);
Recieve_buf[Recieve_W] = USART_ReceiveData(USART2);
Recieve_W++;
Recieve_C++;
}
//}
}
void USART2_init(void) {
GPIO_InitTypeDef GPIO_Init_USART;
USART_InitTypeDef USART_InitUser;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_Init_USART.GPIO_Pin=GPIO_Pin_5|GPIO_Pin_6;
GPIO_Init_USART.GPIO_Mode=GPIO_Mode_AF;
GPIO_Init_USART.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init_USART.GPIO_OType=GPIO_OType_PP;
GPIO_Init_USART.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_Init(GPIOD, &GPIO_Init_USART);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource5,GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource6,GPIO_AF_USART2);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 , ENABLE);
USART_InitUser.USART_BaudRate=9600;
USART_InitUser.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitUser.USART_Mode=USART_Mode_Rx|USART_Mode_Tx ;
USART_InitUser.USART_Parity=USART_Parity_No;
USART_InitUser.USART_StopBits=USART_StopBits_1 ;
USART_InitUser.USART_WordLength=USART_WordLength_8b ;
USART_Init(USART2, &USART_InitUser);
NVIC_EnableIRQ(USART2_IRQn);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_Cmd(USART2, ENABLE);
}
int main(void)
{
USART3_Init();
DMAStream3_Channel4_Init();
while(1){
if( GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)==1) {
USART_DMACmd(USART3, USART_DMAReq_Tx, ENABLE);
DMA_Cmd(DMA1_Stream3, ENABLE);
}
}
} |
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