nano 3.15使用串口DMA接收配置时报错的原因？

发布于 2023-08-13 16:52:34 浏览：342 订阅该版

使用stm32f103ze，移植完成nano的3.1.5版本。在增加uart2的dma接收配置时，出现问题，代码图下
```c
#include "drive_uart.h"

#define LEN_UART2_RECV_BUFF		100

UART_HandleTypeDef UART2_Handler; //UART2句柄
DMA_HandleTypeDef UART2RxDMA_Handler;

unsigned char g_uart2_buff[LEN_UART2_RECV_BUFF]={0};
unsigned char hdma_usart2_rx=0;

void uart2_init_console(u32 bound)
{
		//UART 初始化设置
	UART2_Handler.Instance=USART2;					    //USART2
	UART2_Handler.Init.BaudRate=bound;				    //波特率
	UART2_Handler.Init.WordLength=UART_WORDLENGTH_8B;   //字长为8位数据格式
	UART2_Handler.Init.StopBits=UART_STOPBITS_1;	    //一个停止位
	UART2_Handler.Init.Parity=UART_PARITY_NONE;		    //无奇偶校验位
	UART2_Handler.Init.HwFlowCtl=UART_HWCONTROL_NONE;   //无硬件流控
	UART2_Handler.Init.Mode=UART_MODE_TX_RX;		    
	HAL_UART_Init(&UART2_Handler);					    
}

void dma_usart2_rx_config()
{
	__HAL_RCC_DMA1_CLK_ENABLE();
	
	UART2RxDMA_Handler.Instance 								= DMA1_Channel6;
	UART2RxDMA_Handler.Init.Direction						= DMA_PERIPH_TO_MEMORY;	//外设到内存
	UART2RxDMA_Handler.Init.PeriphInc						= DMA_PINC_DISABLE;
	UART2RxDMA_Handler.Init.MemInc							= DMA_MINC_ENABLE;
	UART2RxDMA_Handler.Init.PeriphDataAlignment	= DMA_PDATAALIGN_BYTE;
	UART2RxDMA_Handler.Init.MemDataAlignment		= DMA_MDATAALIGN_BYTE;
	UART2RxDMA_Handler.Init.Mode								= DMA_CIRCULAR;
	UART2RxDMA_Handler.Init.Priority=DMA_PRIORITY_MEDIUM; 
	
	HAL_DMA_DeInit(&UART2RxDMA_Handler);
	HAL_DMA_Init(&UART2RxDMA_Handler);
	
	__HAL_LINKDMA(&UART2_Handler, hdmatx, UART2RxDMA_Handler);
	
	HAL_UART_Receive_DMA(&UART2_Handler, g_uart2_buff, LEN_UART2_RECV_BUFF);
}

unsigned char buffer_data_num_index()
{
	return (LEN_UART2_RECV_BUFF - __HAL_DMA_GET_COUNTER(&UART2RxDMA_Handler));
}

void dma_usart2_init()
{
	uart2_init_console(115200);
	dma_usart2_rx_config();
}

```

其中 dma_usart2_init 在 main 函数中调用。当在 dma_usart2_rx_config 函数中增加 HAL_UART_Receive_DMA 时，程序启动时会报错，信息如下

```
 \ | /
- RT -     Thread Operating System
 / | \     3.1.5 build Aug 13 2023
 2006 - 2020 Copyright by rt-thread team
psr: 0x01000000
r00: 0x08001f5f
r01: 0x00000000
r02: 0x00000064
r03: 0x00001000
r04: 0x20000208
r05: 0x00000064
r06: 0xdeadbeef
r07: 0xdeadb
 \ | /
- RT -     Thread Operating System
 / | \     3.1.5 build Aug 13 2023
 2006 - 2020 Copyright by rt-thread team
psr: 0x01000000
r00: 0x08001f5f
r01: 0x00000000
r02: 0x00000064
r03: 0x00001000
r04: 0x20000208
r05: 0x00000064
r06: 0xdeadbeef
r07: 0xdeadbeef
r08: 0xdeadbeef
r09: 0xdeadbeef
r10: 0xdeadbeef
r11: 0xdeadbeef
r12: 0x00000008
 lr: 0x0800279f
 pc: 0x08001942
hard fault on thread: main

thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
tshell    21  ready   0x00000040 0x00000400    06%   0x0000000a 000
tidle     31  ready   0x00000044 0x00000100    26%   0x00000020 000
main      10  ready   0x00000044 0x00000400    23%   0x00000013 000
bus fault:
SCB_CFSR_BFSR:0x04 IMPRECISERR 
```
现在不清楚什么原因，希望大家能解惑一下。