stm32DMA数据传输实验
单片机源程序如下:
- /* Includes ------------------------------------------------------------------*/
- #include "stm32f10x.h"
- #include "LCD.h"
- /* Private functions ---------------------------------------------------------*/
- u8 buffer[100];
- void GPIO_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE, ENABLE);
- //USART的TX和RX管脚
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOA , &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- //LED灯
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9 ;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- }
- void USART_Config(void)
- {
- USART_InitTypeDef USART_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
- //配置USART状态
- USART_InitStructure.USART_BaudRate = 9600;
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
- USART_InitStructure.USART_StopBits = USART_StopBits_1;
- USART_InitStructure.USART_Parity = USART_Parity_No;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
- USART_InitStructure.USART_HardwareFlowControl =
- USART_HardwareFlowControl_None;
- USART_Init(USART1 , &USART_InitStructure);
- USART_Cmd(USART1 , ENABLE);
- }
- void DMA_Config(void)
- {
- DMA_InitTypeDef DMA_InitStruct;
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
- DMA_InitStruct.DMA_PeripheralBaseAddr=0x40013804;
- DMA_InitStruct.DMA_MemoryBaseAddr =(u32)buffer;
- DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralDST;
- DMA_InitStruct.DMA_BufferSize = 100;
- 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_Normal;
- DMA_InitStruct.DMA_Priority = DMA_Priority_VeryHigh;
- DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;
- DMA_Init(DMA1_Channel4, &DMA_InitStruct);
- }
- void putData(u8 ch)
- {
- USART_SendData(USART1,ch);
- while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET);
- }
- void Delay(unsigned k)
- {
- unsigned j;
- for(j=0;j<=k;j++);
- }
- void Led1(void)
- {
- GPIO_ResetBits(GPIOC, GPIO_Pin_6);
- Delay(0xfffff);
- GPIO_SetBits(GPIOC, GPIO_Pin_6);
- }
- void Led4(void)
- {
- GPIO_SetBits(GPIOC, GPIO_Pin_9);
- Delay(0xfffff);
- GPIO_ResetBits(GPIOC, GPIO_Pin_9);
- }
- int main(void)
- {
- unsigned i,j=0;
- unsigned char TxBuf1[100] = " welcome to yubing's home!";
- #ifdef DEBUG
- debug();
- #endif
- SystemInit();
- lcd_init ();
- GPIO_Config();
- USART_Config();
- DMA_Config();
- lcd_clear ();
- lcd_putCustomChar();
- lcd_print("is a pig");
- for(i=0;i<=100;i++)
- {
- buffer[j]=TxBuf1[i];
- j++;
- }
- USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);
- DMA_Cmd(DMA1_Channel4, ENABLE);
- while(DMA_GetFlagStatus(DMA1_FLAG_TC4)==RESET)
- {
- Led4();
- }
- while(1)
- {
- }
- }
- /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
所有资料51hei提供下载:
project8_DMA.7z
(174.72 KB, 下载次数: 8)
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