官方例程只有发送是用dma的，接收不是。
我自己写了一个，但是会卡住
void Spi1_InitSlave()
{
printf("Spi1_InitSlave\r\n");
GPIO_InitTypeDef GPIO_InitStructure={0};
SPI_InitTypeDef SPI_InitStructure={0};
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE );
//cs
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure );
//clk
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure );
//miso
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //MISO
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure );
//mosi
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure );
SPI_SSOutputCmd(SPI1, ENABLE );
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure );
SPI_Cmd(SPI1, ENABLE );
// //PC4:LCD_DC
// //PC5:LCD_RESET
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
// GPIO_Init(GPIOC, &GPIO_InitStructure);
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
// GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void DMA_Tx_Init(DMA_Channel_TypeDef *DMA_CHx, u32 ppadr, u32 memadr, u16 bufsize)
{
DMA_InitTypeDef DMA_InitStructure = {0};
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
DMA_DeInit(DMA_CHx);
DMA_InitStructure.DMA_PeripheralBaseAddr = ppadr;
DMA_InitStructure.DMA_MemoryBaseAddr = memadr;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = bufsize;
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_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA_CHx, &DMA_InitStructure);
DMA_ClearFlag(DMA1_FLAG_TC5);
}
void DMA_Rx_Init( DMA_Channel_TypeDef* DMA_CHx, u32 ppadr, u32 memadr, u16 bufsize )
{
DMA_InitTypeDef DMA_InitStructure={0};
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );
DMA_DeInit(DMA_CHx);
DMA_InitStructure.DMA_PeripheralBaseAddr = ppadr;
DMA_InitStructure.DMA_MemoryBaseAddr = memadr;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = bufsize;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init( DMA_CHx, &DMA_InitStructure );
// DMA_ITConfig(DMA_CHx, DMA_IT_TC, ENABLE);
}
void TestSpi()
{
u8 TxData[32];
u8 RxData[32];
for (u8 i = 0;i<32; i ++)
TxData[i] = 0xC0+i;
Spi1_InitSlave();
printf("TestSpi\r\n");
while (1)
{
DMA_Tx_Init( DMA1_Channel3, (u32)&SPI1->DATAR, (u32)TxData, 32);
DMA_Rx_Init( DMA1_Channel2, (u32)&SPI1->DATAR, (u32)RxData, 32);
DMA_Cmd( DMA1_Channel3, ENABLE );
DMA_Cmd( DMA1_Channel2, ENABLE );
printf("wait TC2&TC3\r\n");
// while (DMA_GetITStatus(DMA1_IT_TC2) == RESET) ;
while( (!DMA_GetFlagStatus(DMA1_FLAG_TC2)) && (!DMA_GetFlagStatus(DMA1_FLAG_TC3)) ); <---这里卡住了
printf("wait BSY\r\n");
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY)) ;
Dump_HexLine(RxData, 32);
Delay_Ms(500);
}
}
