Posted on December 10, 2014 at 19:15I have configured my STM32F407 Discovery Board as slave with a STM8S00. The data sent by Master on MOSI is totally different from that which that my slave is receiving I have observed that data on the Digital Oscilloscope. Setting in the master is as follows: CPHA=1 CPOL=1 Master sends at Negative edge and samples at positive edge. SPI Clock is 4 MHz. It is also sending back different data that sent by a STM32F407 master.
Here is the code of main file:
#include ''stm32f4_discovery.h''
int i=0, IT_St=0;
int Rx_Buf[1000];
void SPI_TR(void);;
void n_Tick(int tk);
void n_Tick(int tk)
{
while(tk--)
{
}
}
void SPI_TR(void)
{
GPIO_InitTypeDef GPIO_SPI;
SPI_InitTypeDef My_SPI;
NVIC_InitTypeDef nvic;
EXTI_InitTypeDef itr;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
//PA4=NSS PA5=SCK PA6=MISO PA7=MOSI
GPIO_SPI.GPIO_Pin=GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_SPI.GPIO_Mode=GPIO_Mode_AF;
GPIO_SPI.GPIO_PuPd=GPIO_PuPd_NOPULL;
GPIO_SPI.GPIO_OType=GPIO_OType_PP ;
GPIO_SPI.GPIO_Speed=GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_SPI);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
nvic.NVIC_IRQChannel=SPI1_IRQn;
nvic.NVIC_IRQChannelCmd = ENABLE;
nvic.NVIC_IRQChannelPreemptionPriority= 0;
NVIC_Init(&nvic);
My_SPI.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
My_SPI.SPI_Mode = SPI_Mode_Slave;
My_SPI.SPI_DataSize = SPI_DataSize_8b;
My_SPI.SPI_CPOL = SPI_CPOL_High;
My_SPI.SPI_CPHA = SPI_CPHA_2Edge;
My_SPI.SPI_NSS = SPI_NSS_Hard; // Configure it make high to low transition
//My_SPI.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_16;
My_SPI.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI1, &My_SPI);
SPI_Cmd(SPI1, ENABLE);
}
void SPI1_IRQHandler()
{
Rx_Buf[i]=SPI_I2S_ReceiveData(SPI1);
//i=SPI_I2S_ReceiveData(SPI1);
SPI_I2S_ClearFlag(SPI1, SPI_I2S_FLAG_RXNE);
SPI_I2S_ClearITPendingBit(SPI1, SPI_I2S_IT_RXNE);
SPI_I2S_SendData(SPI1, FIFO_STATUS_RX_FULL);
i++;
if(i>=1000)
i=0;
}
int main(void)
{
SPI_TR();
while(1)
{
}
}
