用DMA1控制USART1发送数据，通道1能发送成功，通道4反而不能

代码狗的成长

彻底凌乱，大概没人遇过这种诡异的问题吧==!

[mw_shl_code=c,true] #include "stm32f10x.h" #include "stm32f10x_conf.h" #include "misc.h" #include "usart.h" #include "sys.h" GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; vu8 USARTOutVal[5]="hello"; void DMA_Configuration(void); void RCC_Configuration(void); void GPIO_Configuration(void); int main(void) { RCC_Configuration(); GPIO_Configuration(); DMA_Configuration(); delay_init(); uart_init(115200); while(1); } void GPIO_Configuration(void) { GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; 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); } void RCC_Configuration(void) { SystemInit(); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB , ENABLE); } void USART_Config(USART_TypeDef* USARTx) { 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(USARTx, &USART_InitStructure); USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE); USART_ITConfig(USARTx, USART_IT_TXE, ENABLE); USART1->CR3=1<<7; USART_Cmd(USARTx, ENABLE); } void DMA_Configuration(void) { DMA_InitTypeDef DMA_InitStructure; /* Enable DMA clock */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); /* DMA channel1 configuration ----------------------------------------------*/ //使能DMA DMA_DeInit(DMA1_Channel1); //DMA通道1的地址 DMA_InitStructure.DMA_PeripheralBaseAddr = 0x40013804; DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&USARTOutVal; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = 5; //传送内存大小，100个16位 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //传送内存地址递增 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //循环 DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel1, &DMA_InitStructure); //使能DMA通道1 DMA_Cmd(DMA1_Channel1, ENABLE); } [/mw_shl_code]

正点原子

设置问题吧，参考下我们的代码。