DMA+USART STM32F030无反应,配置哪里出问题呢?

cl17726 · 发表于 2014-8-23 14:34:13

写了个很简单的测试程序.

[mw_shl_code=c,true]#include "stm32f0xx.h" #define GPIO_AF_USART1 GPIO_AF_1 const uint32_t SRC_Const_Buffer[32] = { 0x01020304, 0x05060708, 0x090A0B0C, 0x0D0E0F10, 0x11121314, 0x15161718, 0x191A1B1C, 0x1D1E1F20, 0x21222324, 0x25262728, 0x292A2B2C, 0x2D2E2F30, 0x31323334, 0x35363738, 0x393A3B3C, 0x3D3E3F40, 0x41424344, 0x45464748, 0x494A4B4C, 0x4D4E4F50, 0x51525354, 0x55565758, 0x595A5B5C, 0x5D5E5F60, 0x61626364, 0x65666768, 0x696A6B6C, 0x6D6E6F70, 0x71727374, 0x75767778, 0x797A7B7C, 0x7D7E7F80 }; void USART1_Test() { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; DMA_InitTypeDef DMA_InitStructure; //打开时钟 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //GPIO复用 GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART1); GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART1); //串口IO初始化公共部分 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //TX IO 初始化 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); //RX IO 初始化 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_Init(GPIOA, &GPIO_InitStructure); //配置串口 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_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART1, &USART_InitStructure); //初始化串口 USART_Cmd(USART1, ENABLE); //配置DMA,TDR寄存器填写. DMA_DeInit(DMA1_Channel2); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART1->TDR); //外设寄存器地址 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SRC_Const_Buffer;//待发送缓冲区 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//外设作为目标地址 DMA_InitStructure.DMA_BufferSize = 32;//传输大小 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址不变 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//源地址递增 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//每次发送都是Byte DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//字节 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//单次传输 DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//中等优先级 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//不是内存到内存传输 DMA_Init(DMA1_Channel4, &DMA_InitStructure);//初始化 //使能DMA USART传输 USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); DMA_Cmd(DMA1_Channel2, ENABLE); } int main(void) { USART1_Test(); for(;;) { } } [/mw_shl_code]

串口配置是没错的,用USART_SendData试过,但是加上DMA不知道如何配置,反正现在没法送数据出来.程序简化成这样了,有注释,求助大家帮忙看看.