Posted on May 17, 2011 at 13:08Hello all!
I have a buffer SPI1_Buffer_Tx[] that I want transfer in SPI1 by using DMA and then transfer it into an external device. Buffer SPI1_Buffer_Rx[] receive data using DMA. SPI work in full-duplex mode.
But i can only do the transfer when i active the DMA_Cmd in the first time (DMA and SPI do it automtically). I like transfer data one more times, but no circular. I like trigger transfer by software.
void DMA1_Channel2_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC2))
{
DMA_ClearITPendingBit(DMA1_IT_TC2);
GPIO_SetBits(GPIO_CS, GPIO_Pin_CS);
}
}
void SPI1_DMA1_Init (void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); // Enable SPI1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // Enable GPIO clocks
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); // DMA
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); // Configure SPI1 pins: SCK, MISO and MOSI
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_CS;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIO_CS, &GPIO_InitStructure); // Configure I/O for Chip select
GPIO_SetBits(GPIO_CS, GPIO_Pin_CS);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure); // SPI1 configuration
DMA_DeInit(DMA1_Channel2); // DMA1 Channel2 configuration
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)SPI1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SPI1_Buffer_Rx;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = SPI1_BufferSize;
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_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);
DMA_DeInit(DMA1_Channel3); // DMA1 Channel3 configuration
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)SPI1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SPI1_Buffer_Tx;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
DMA_Init(DMA1_Channel3, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel2, DMA_IT_TC, ENABLE); // Enable Channel2 Transfer complete interrupt
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); // Configure none bit for preemption priority
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 10;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure); // Enable the DMA1 Channel 2 Interrupt
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE); // Enable SPI1 DMA Tx request
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE); // Enable SPI1 DMA Rx request
SPI_Cmd(SPI1, ENABLE); // Enable SPI1
GPIO_ResetBits(GPIO_CS, GPIO_Pin_CS);
DMA_Cmd(DMA1_Channel2, ENABLE); // Enable DMA1 channel2
DMA_Cmd(DMA1_Channel3, ENABLE); // Enable DMA1 channel3
}
void SPI_Send_Packet ()
{
\\ ???
}
What must by written in ''SPI_Send_Packet()'' function for send SPI1_Buffer_Tx[] buffer?
Can me anybody help, please?
Thanks
