[Help] SPI DMA STM32F4

[kakaducsy]

Posted on October 24, 2016 at 06:52

hi,

I am communicating with the handle of the ps2 using spi dma stm32f4,but encountered a few problems While I do not use dma it works fine i use

void
PS2_Send_Recive(unsigned 
char
commands[], unsigned 
char
data[], 
int
length)
{
int
i = 0;
//set CS pin low to select PS2
GPIO_ResetBits(GPIOA, GPIO_Pin_4); 
//CS ON
delay_us(15); 
//15us delay before sending commands
for
(i = 0; i < length; i = i + 1)
{
while
(SPI_I2S_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET){}
SPI_I2S_SendData(SPI1, commands[i]);
//delay_us(20);
while
(SPI_I2S_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET){}
data[i] = SPI_I2S_ReceiveData(SPI1);
delay_us(20); 
//15us delay before sending next command
}
//set CS pin high to deselect PS2
GPIO_SetBits(GPIOA, GPIO_Pin_4); 
//CS OFF
}

in main

int
main(
void
)
{
PeriphClk_config();
GPIO_config();
Timer3_config();
SPI_config();
while
(1)
{
PS2_Send_Recive(PS2_InitialPoll, Data, 9);
}

with

unsigned 
char
PS2_InitialPoll[9] = {0x01, 0x42, 0x00, 0x00, 0x00,0x00, 0x00, 0x00,0x00};
unsigned 
char
Data[9] = {0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00};

i see Data on stmstudio : when send (0x01 is 255); (0x42--115); (0x00--90) ; (0x00--255)..... it correct but when i use DMA i setup

void
DMA_SPI()
{
//TX
DMA_Init_SPI.DMA_Channel = DMA_Channel_3;
DMA_Init_SPI.DMA_PeripheralBaseAddr = (uint32_t)&(SPI1->DR);
DMA_Init_SPI.DMA_Memory0BaseAddr = (uint32_t)SPI_Out;
DMA_Init_SPI.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_Init_SPI.DMA_BufferSize = 9;
DMA_Init_SPI.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_Init_SPI.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_Init_SPI.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_Init_SPI.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_Init_SPI.DMA_Mode = DMA_Mode_Normal;
DMA_Init_SPI.DMA_Priority = DMA_Priority_Medium;
DMA_Init_SPI.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_Init_SPI.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
DMA_Init_SPI.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_Init_SPI.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream3, &DMA_Init_SPI);
NVIC_EnableIRQ(DMA2_Stream3_IRQn);
DMA_ITConfig(DMA2_Stream3, DMA_IT_TC, ENABLE);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
//RX
DMA_Init_SPI.DMA_Channel = DMA_Channel_3;
DMA_Init_SPI.DMA_PeripheralBaseAddr = (uint32_t)&(SPI1->DR);
DMA_Init_SPI.DMA_Memory0BaseAddr = (uint32_t)SPI_In;
DMA_Init_SPI.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_Init_SPI.DMA_BufferSize = 9;
DMA_Init_SPI.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_Init_SPI.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_Init_SPI.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_Init_SPI.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_Init_SPI.DMA_Mode = DMA_Mode_Normal;
DMA_Init_SPI.DMA_Priority = DMA_Priority_Medium;
DMA_Init_SPI.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_Init_SPI.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
DMA_Init_SPI.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_Init_SPI.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_Init_SPI);
NVIC_EnableIRQ(DMA2_Stream0_IRQn);
DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
}
void
StartSPI(uint8_t number)
{
DMA_SetCurrDataCounter(DMA2_Stream0,number);
DMA_SetCurrDataCounter(DMA2_Stream3,number);
SPI_work=1;
GPIO_ResetBits(GPIOA, GPIO_Pin_4); 
DMA_Cmd(DMA2_Stream0,ENABLE);
DMA_Cmd(DMA2_Stream3,ENABLE);
}
void
SPIwait(
void
)
{
while
(SPI_work){}
}
void
SetSPI_Out(uint8_t Adr,uint8_t Data)
{
if
(Adr<9)
{
SPI_Out[Adr]=Data;
}
}
uint8_t GetSPI_In(uint8_t Adr)
{
return
SPI_In[Adr];
}
//RX
void
DMA2_Stream0_IRQHandler(
void
)
{
if
(DMA_GetITStatus(DMA2_Stream0, DMA_IT_TCIF0) == SET)
{
DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_TCIF0);
GPIO_SetBits(GPIOA, GPIO_Pin_4); 
SPI_work=0;
i++;
}
}
//-----------------------------------------------------------------
//TX
void
DMA2_Stream3_IRQHandler(
void
)
{
if
(DMA_GetITStatus(DMA2_Stream3, DMA_IT_TCIF3) == SET)
{
DMA_ClearITPendingBit(DMA2_Stream3, DMA_IT_TCIF3);
j++;
}
}

in main

int
main(
void
)
{
PeriphClk_config();
GPIO_config();
Timer3_config();
SPI_config();
DMA_SPI();
SetSPI_Out(0,0x01);
SetSPI_Out(1,0x42);
SetSPI_Out(2,0x00);
SetSPI_Out(3,0x00);
SetSPI_Out(4,0x00);
SetSPI_Out(5,0x00);
SetSPI_Out(6,0x00);
SetSPI_Out(7,0x00);
SetSPI_Out(8,0x00);
StartSPI(9);
SPIwait();
while
(1)
{
GPIOD->ODR = GPIOD->ODR | GPIO_Pin_13;
}

data read is SPI_In on stmstudio is all value 255 and on board

GPIO_Pin_13 not ON,i thinkcursor standing SPIwait() andcan not access while(1)

#clive1 #system-account

[Nesrine M_O]

Posted on November 02, 2016 at 10:39

Hi duc_sy.nguyen,

I recommend you to have a look to this example under the STM32F4 standard peripherals library it may be helpful:STM32F4xx_DSP_StdPeriph_Lib_V1.7.1\Project\STM32F4xx_StdPeriph_Examples\SPI\SPI_TwoBoards\SPI_DataExchangeDMA-Syrine-