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標(biāo)題: DMA控制M2M，M2P [打印本頁(yè)]

作者: sane 時(shí)間: 2019-11-21 20:22
標(biāo)題: DMA控制M2M，M2P
DAM控制器
內(nèi)存到內(nèi)存空間
1、在flash中定義好要傳輸?shù)臄?shù)據(jù)，在SRAM中定義好用來(lái)接收f(shuō)lash數(shù)據(jù)的變量。
2、初始化DMA，主要配置DMA初始化結(jié)構(gòu)體。
3、編寫比較函數(shù)。
4、編寫main函數(shù)。
typedef struct
{
  uint32_t DMA_PeripheralBaseAddr; //外設(shè)地址數(shù)據(jù)目標(biāo)地址

  uint32_t DMA_MemoryBaseAddr;    /*存儲(chǔ)地址數(shù)據(jù)來(lái)源地址*/

  uint32_t DMA_DIR;             /*傳輸方向*/

  uint32_t DMA_BufferSize;       /*傳輸數(shù)目*/

  uint32_t DMA_PeripheralInc;    /*外設(shè)地址增量模式*/

  uint32_t DMA_MemoryInc;       /*存儲(chǔ)器地址增量模式*/

  uint32_t DMA_PeripheralDataSize; /*外設(shè)數(shù)據(jù)寬度*/

  uint32_t DMA_MemoryDataSize;    /*存儲(chǔ)器數(shù)據(jù)寬度*/

  uint32_t DMA_Mode;             /*模式選擇*/

  uint32_t DMA_Priority;          /*通道優(yōu)先級(jí)*/

  uint32_t DMA_M2M;             /*存儲(chǔ)器到存儲(chǔ)器模式*/
}DMA_InitTypeDef;
//DMA1_Channel6 初始化函數(shù)
//從FLASH傳送數(shù)據(jù)到SRAM
void DmaConfig(void)
{
DMA_InitTypeDef DMA_InitStruct;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)SRAM_SIZE;
DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)FLASH_SIZE;
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStruct.DMA_BufferSize = BUF_SIZE;
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Enable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
DMA_InitStruct.DMA_Priority = DMA_Priority_Medium;
DMA_InitStruct.DMA_M2M = DMA_M2M_Enable;

DMA_Init(DMA1_Channel6, &DMA_InitStruct);

DMA_ClearFlag(DMA1_FLAG_TC6);
DMA_Cmd(DMA1_Channel6, ENABLE);
}

//從flash發(fā)送數(shù)據(jù)到USART
void PTOM_DmaConfig(void)
{
DMA_InitTypeDef DMA_InitStruct;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)USART1_BASE_DR;
DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)SEND_USART;
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStruct.DMA_BufferSize = USART_BUF_SIZE;
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
DMA_InitStruct.DMA_Priority = DMA_Priority_Medium;
DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel4, &DMA_InitStruct);

DMA_ClearFlag(DMA1_FLAG_TC4);
DMA_Cmd(DMA1_Channel4, ENABLE);

}
//串口初始化，但不使能中斷
void Usart_Config(void)
{
  //GPIO端口設(shè)置
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA時(shí)鐘

//USART1_TX GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9

  //USART1_RX    GPIOA.10初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空輸入
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10

//USART 初始化設(shè)置

USART_InitStructure.USART_BaudRate = 115200;//串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字長(zhǎng)為8位數(shù)據(jù)格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一個(gè)停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//無(wú)奇偶校驗(yàn)位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無(wú)硬件數(shù)據(jù)流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收發(fā)模式

  USART_Init(USART1, &USART_InitStructure); //初始化串口1
  USART_Cmd(USART1, ENABLE);                   //使能串口1

}

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