spi1 send data error in slave mode

[hirxen]

Posted on July 25, 2013 at 17:03

Hi,

I am using STM32F051R8T6 through spi interface to communicate with ADF7 STM32 works in slave mode and ADF7021 works in master mode . ADF7021 provide the continually clock. But the data output from PA6 was inconsistent with what I really send . When I send 00010100 ,the output is 000 When I send 1001001001, the output is 1010 It has puzzled me for two weeks. Here are parts of my code , may someone can give me a hand 🙂 GPIO configuation :

/*Configure SPI1 pins: PA4<-->NSS, PA5<-->SCK, PA6<-->MISO, PA7<-->MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); 
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0); 
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_0);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);

SPI communication format:

void SPI1S_Configuration(void)
{ 
SPI_InitTypeDef SPI_InitStructure;
SPI_Cmd(SPI2, DISABLE);
SPI_StructInit( (SPI_InitTypeDef *)&SPI_InitStructure);
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_1Edge; 
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; 
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4; 
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; 
SPI_InitStructure.SPI_CRCPolynomial = 7; 
SPI_Init(SPI1, &SPI_InitStructure);
SPI_NSSInternalSoftwareConfig(SPI1, SPI_NSSInternalSoft_Reset);
SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF); 
SPI_CalculateCRC(SPI1, DISABLE);
SPI_Cmd(SPI1, ENABLE);
}

SPI1 interrupt deal：

void SPI1_IRQHandler(void)
{
if( SPI_I2S_GetITStatus(SPI1, SPI_I2S_IT_TXE) == SET )
{ 
SPI_SendData8(SPI1, spi1_tx_buffer[spi1_tx_count]);
spi1_tx_count++;
}
if( SPI_I2S_GetITStatus(SPI1, SPI_I2S_IT_RXNE) == SET ) 
{ 
spi1_rx_buffer[spi1_rx_count] = SPI_ReceiveData8(SPI1);
spi1_rx_count++;
}
}