DAM控制器
內存到內存空間
1、在flash中定義好要傳輸的數據，在SRAM中定義好用來接收flash數據的變量。
2、初始化DMA，主要配置DMA初始化結構體。
3、編寫比較函數。
4、編寫main函數。
typedef struct
{
uint32_t DMA_PeripheralBaseAddr; //外設地址 數據目標地址
uint32_t DMA_MemoryBaseAddr; /*存儲地址 數據來源地址*/
uint32_t DMA_DIR; /*傳輸方向*/
uint32_t DMA_BufferSize; /*傳輸數目*/
uint32_t DMA_PeripheralInc; /*外設地址增量模式*/
uint32_t DMA_MemoryInc; /*存儲器地址增量模式*/
uint32_t DMA_PeripheralDataSize; /*外設數據寬度*/
uint32_t DMA_MemoryDataSize; /*存儲器數據寬度*/
uint32_t DMA_Mode; /*模式選擇*/
uint32_t DMA_Priority; /*通道優先級*/
uint32_t DMA_M2M; /*存儲器到存儲器模式*/
}DMA_InitTypeDef;
//DMA1_Channel6 初始化函數
//從FLASH傳送數據到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發送數據到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端口設置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA時鐘
//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 初始化設置
USART_InitStructure.USART_BaudRate = 115200;//串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字長為8位數據格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一個停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//無奇偶校驗位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無硬件數據流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收發模式
USART_Init(USART1, &USART_InitStructure); //初始化串口1
USART_Cmd(USART1, ENABLE); //使能串口1
}
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