stm32f407串口dma发送数组的代码,数组大小为4个,int adcvalue[4];
时间: 2024-02-03 09:12:09 浏览: 72
以下是基于HAL库的示例代码:
```c
// 定义数组
int adcvalue[4];
// 定义DMA发送缓冲区
uint8_t dma_buffer[16];
// 初始化串口、DMA和GPIO等
// 将数组内容复制到DMA缓冲区
for (int i = 0; i < 4; i++) {
dma_buffer[i*4] = (adcvalue[i] >> 24) & 0xFF;
dma_buffer[i*4+1] = (adcvalue[i] >> 16) & 0xFF;
dma_buffer[i*4+2] = (adcvalue[i] >> 8) & 0xFF;
dma_buffer[i*4+3] = adcvalue[i] & 0xFF;
}
// 启动DMA发送
HAL_UART_Transmit_DMA(&huart1, dma_buffer, sizeof(dma_buffer));
```
上述代码中,我们首先定义了一个名为`adcvalue`的数组,大小为4个`int`类型元素。接着,我们定义了一个DMA发送缓冲区`dma_buffer`,大小为16个字节(即4个`int`类型元素)。在将数组内容复制到DMA缓冲区时,我们通过位运算将每个`int`类型元素拆分成4个`uint8_t`类型的字节,并依次存放到DMA缓冲区中。最后,我们使用`HAL_UART_Transmit_DMA`函数启动DMA发送过程。
相关问题
请问stm32如何通过串口dma发送数组数据的内容代码
您好,关于您的问题,以下是一个参考代码示例:
```c
#include "stm32f4xx.h"
#define BUFFER_SIZE 256
uint8_t buffer[BUFFER_SIZE];
void init_uart() {
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
GPIO_InitTypeDef gpio_init;
gpio_init.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
gpio_init.GPIO_Mode = GPIO_Mode_AF;
gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
gpio_init.GPIO_OType = GPIO_OType_PP;
gpio_init.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &gpio_init);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_USART3);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_USART3);
USART_InitTypeDef usart_init;
usart_init.USART_BaudRate = 9600;
usart_init.USART_WordLength = USART_WordLength_8b;
usart_init.USART_StopBits = USART_StopBits_1;
usart_init.USART_Parity = USART_Parity_No;
usart_init.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
usart_init.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_Init(USART3, &usart_init);
USART_Cmd(USART3, ENABLE);
}
void init_dma() {
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_InitTypeDef dma_init;
dma_init.DMA_Channel = DMA_Channel_4;
dma_init.DMA_PeripheralBaseAddr = (uint32_t)&USART3->DR;
dma_init.DMA_Memory0BaseAddr = (uint32_t)buffer;
dma_init.DMA_DIR = DMA_DIR_MemoryToPeripheral;
dma_init.DMA_BufferSize = BUFFER_SIZE;
dma_init.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
dma_init.DMA_MemoryInc = DMA_MemoryInc_Enable;
dma_init.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
dma_init.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
dma_init.DMA_Mode = DMA_Mode_Normal;
dma_init.DMA_Priority = DMA_Priority_High;
dma_init.DMA_FIFOMode = DMA_FIFOMode_Disable;
dma_init.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_Init(DMA1_Stream3, &dma_init);
USART_DMACmd(USART3, USART_DMAReq_Tx, ENABLE);
}
int main() {
init_uart();
init_dma();
// Fill buffer with data
for (int i = 0; i < BUFFER_SIZE; i++) {
buffer[i] = (uint8_t)i;
}
// Start DMA transfer
DMA_Cmd(DMA1_Stream3, ENABLE);
// Wait for transfer to complete
while (DMA_GetFlagStatus(DMA1_Stream3, DMA_FLAG_TCIF3) == RESET);
return 0;
}
```
这个示例演示了如何通过 DMA 发送一个数组的数据。在初始化中,串口初始化了 USART3,DMA 初始化了 DMA1_Stream3。在主函数中,首先填充缓冲区,然后启动 DMA 传输。最后,它等待传输完成。根据您的需要进行调整后,您可以在自己的代码中使用此示例作为起点。希望它对您有帮助!
stm32串口通过dma发送数组的代码
好的,下面是在STM32上使用DMA发送数组的代码:
```c
#include "stm32f4xx.h"
#define BUFFER_SIZE 10
uint32_t tx_buffer[BUFFER_SIZE] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A};
int main(void)
{
// 初始化GPIO和USART
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
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_Tx;
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
// 初始化DMA
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)tx_buffer;
DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &USART2->DR;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream6, &DMA_InitStructure);
// 等待USART就绪
while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
// 启动DMA传输
DMA_Cmd(DMA1_Stream6, ENABLE);
// 等待传输完成
while(DMA_GetFlagStatus(DMA1_Stream6, DMA_FLAG_TCIF6) == RESET);
// 关闭DMA传输
DMA_Cmd(DMA1_Stream6, DISABLE);
while(1);
}
```
该代码演示了使用DMA在STM32上发送一个10个元素的数组。DMA使用了通道4,将内存中的数组直接复制到USART的数据寄存器中进行发送。程序等待USART就绪之后启动DMA传输,等待传输完成之后关闭DMA传输。请注意,以上代码仅用于演示DMA如何用于发送数组,实际使用时应该根据具体需求进行修改。
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