前段時間成功地重定向串口發送功能到系統printf函數上,
printf("《你的名字》: %s",Name);
用起來感覺真爽,但就是太佔資源了,於是就想用DMA方式發送數據,但又想要printf的便捷性,於是找到了下面這篇文章
雖然演示的是IAR上的代碼,但其實就是定義了一個可變參數的函數,把發送的數據整合到數組,再用DMA發送。稍微修改就可以放MDK上用了。
//main.c
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "stdio.h"
#include "VarData.h"
#include "stdarg.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define USART1_DR_Base 0x40013804
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
#define SENDBUFF_SIZE 10240
u8 SendBuff[SENDBUFF_SIZE];
vu8 RecvBuff[10];
vu8 recv_ptr;
u32 DMA1_4 = RESET;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void DMA_Configuration(u8 *uiSendBuf,u32 uiLength);
void USART1_Configuration(void);
void Delay(void);
int printf(const char *format ,... )
{
va_list arg;
int rv;
while(DMA1_4 == SET);
va_start(arg, format);
rv = vsprintf(SendBuff, format, arg);
va_end(arg);
DMA_Configuration(SendBuff,rv);
//開始一次DMA傳輸!
DMA_Cmd(DMA1_Channel4, ENABLE);
LEDRUN(LAMP_ON);
return rv;
}
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
u16 i;
#ifdef DEBUG
debug();
#endif
recv_ptr = 0;
RCC_Configuration();
GPIO_Configuration();
NVIC_Configuration();
USART1_Configuration();
for(i=0;i<SENDBUFF_SIZE;i++)
{
SendBuff[i] = i&0xff;
}
//printf("Initial success!\r\nWaiting for transmission...\r\n");
//發送去數據已經準備好,按下按鍵即開始傳輸
// while(GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_3));
// printf("Start DMA transmission!\r\n");
//這裏是開始DMA傳輸前的一些準備工作,將USART1模塊設置成DMA方式工作
USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
/* Enable DMA1 Channel4 */
DMA_Cmd(DMA1_Channel4, ENABLE);
printf("Initial success!\r\nWaiting for transmission %d ...\r\n",i);
//DMA傳輸結束後,自動關閉了DMA通道,而無需手動關閉
//下面的語句被註釋
//DMA_Cmd(DMA1_Channel4, DISABLE);
printf("\r\nDMA transmission successful!\r\n");
/* Infinite loop */
while (1)
{
printf("\r\nDMA transmission successful!successful,successful,successful\r\n");
}
}
/*******************************************************************************
* Function Name : Delay
* Description : 延時函數
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void Delay(void)
{
u32 i;
for(i=0;i<0xF0000;i++);
return;
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : 系統時鐘設置
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
//使能外部晶振
RCC_HSEConfig(RCC_HSE_ON);
//等待外部晶振穩定
HSEStartUpStatus = RCC_WaitForHSEStartUp();
//如果外部晶振啓動成功,則進行下一步操作
if(HSEStartUpStatus==SUCCESS)
{
//設置HCLK(AHB時鐘)=SYSCLK
RCC_HCLKConfig(RCC_SYSCLK_Div1);
//PCLK1(APB1) = HCLK/2
RCC_PCLK1Config(RCC_HCLK_Div2);
//PCLK2(APB2) = HCLK
RCC_PCLK2Config(RCC_HCLK_Div1);
//FLASH時序控制
//推薦值:SYSCLK = 0~24MHz Latency="0"
// SYSCLK = 24~48MHz Latency="1"
// SYSCLK = 48~72MHz Latency="2"
FLASH_SetLatency(FLASH_Latency_2);
//開啓FLASH預取指功能
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
//PLL設置 SYSCLK/1 * 9 = 8*1*9 = 72MHz
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
//啓動PLL
RCC_PLLCmd(ENABLE);
//等待PLL穩定
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
//系統時鐘SYSCLK來自PLL輸出
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
//切換時鐘後等待系統時鐘穩定
while(RCC_GetSYSCLKSource()!=0x08);
/*
//設置系統SYSCLK時鐘爲HSE輸入
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
//等待時鐘切換成功
while(RCC_GetSYSCLKSource() != 0x04);
*/
}
//下面是給各模塊開啓時鐘
//啓動GPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | \
RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD,\
ENABLE);
//啓動AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//啓動USART1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
//啓動DMA時鐘
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : GPIO設置
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/*板上LED控制*/
/* Configure PC.2 and PC.3 as output OD for LED
General purpose output Open-drain*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
//USART1_TX
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);
//USART1_RX
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : NVIC設置
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
// Set the Vector Table base location at 0x20000000
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
// Set the Vector Table base location at 0x08000000
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
//設置NVIC優先級分組爲Group2:0-3搶佔式優先級,0-3的響應式優先級
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
//串口接收中斷打開
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the DMA Channel 1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*******************************************************************************
* Function Name : USART1_Configuration
* Description : NUSART1設置
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USART1_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
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_Tx | USART_Mode_Rx;
USART_Init(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
}
void DMA_Configuration(u8 *uiSendBuf,u32 uiLength)
{
DMA_InitTypeDef DMA_InitStructure;
//DMA設置:
//設置DMA源:內存地址&串口數據寄存器地址
//方向:內存-->外設
//每次傳輸位:8bit
//傳輸大小DMA_BufferSize=SENDBUFF_SIZE
//地址自增模式:外設地址不增,內存地址自增1
//DMA模式:一次傳輸,非循環
//優先級:中
DMA_DeInit(DMA1_Channel4);
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)uiSendBuf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = uiLength;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
/* Enable Channel5 Transfer complete interrupt */
DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);
}
中斷:
/*******************************************************************************
* Function Name : DMA1_Channel4_IRQHandler
* Description : This function handles DMA1 Channel 4 interrupt request.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void DMA1_Channel4_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC4))
{
DMA_ClearITPendingBit(DMA1_IT_TC4);
LEDRUN(LAMP_OFF);
}
if(DMA_GetITStatus(DMA1_IT_HT4))
{
DMA_ClearITPendingBit(DMA1_IT_HT4);
}
if(DMA_GetITStatus(DMA1_IT_TE4))
{
DMA_ClearITPendingBit(DMA1_IT_TE4);
}
if(DMA_GetITStatus(DMA1_IT_GL4))
{
DMA_ClearITPendingBit(DMA1_IT_GL4);
}
}