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STM32F303VC : SPI1 (Master) SPI2 (Slave)
Hello Everyone,
I am trying to establish communication between SPI1 and SPI2 on the STM32F303 Discovery board.
I have configured SPI1 as Master and SPI2 as Slave. I am receiving 0xFF when a Receive interrupt is fired in SPI2.
SPI1 Master module is configured so:
/**
* PA4 - NSS PB12 - NSS
* PA5 - SCK PB13 - SCK
* PA6 - MISO PB15 - M0SI
* PA7 - MOSI PB14 - MISO
*/
__HAL_RCC_SPI1_CLK_ENABLE();
LL_SPI_InitTypeDef SPI1InitStruct;
SPI1InitStruct.BaudRate = LL_SPI_BAUDRATEPRESCALER_DIV4;
SPI1InitStruct.ClockPhase = LL_SPI_PHASE_2EDGE;
SPI1InitStruct.ClockPolarity = LL_SPI_POLARITY_HIGH;
SPI1InitStruct.CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE;
SPI1InitStruct.DataWidth = LL_SPI_DATAWIDTH_8BIT;
SPI1InitStruct.TransferDirection = LL_SPI_FULL_DUPLEX;
SPI1InitStruct.BitOrder = LL_SPI_MSB_FIRST;
SPI1InitStruct.Mode = LL_SPI_MODE_MASTER;
SPI1InitStruct.NSS = LL_SPI_NSS_HARD_OUTPUT;
LL_SPI_Init(SPI1, &SPI1InitStruct);
LL_SPI_Enable(SPI1);SPI1 GPIO is configured so:
/** MASTER SLAVE
* ********** **********
* PA4 - NSS PB12 - NSS
* PA5 - SCK PB13 - SCK
* PA6 - MISO PB15 - M0SI
* PA7 - MOSI PB14 - MISO
*/
if (RESET == __HAL_RCC_GPIOA_IS_CLK_ENABLED())
{
__HAL_RCC_GPIOA_CLK_ENABLE();
}
LL_GPIO_InitTypeDef gpioSPIInitStr;
gpioSPIInitStr.Alternate = LL_GPIO_AF_5;
gpioSPIInitStr.Pin = LL_GPIO_PIN_5 | LL_GPIO_PIN_7;
gpioSPIInitStr.Mode = LL_GPIO_MODE_ALTERNATE;
gpioSPIInitStr.Speed = LL_GPIO_SPEED_FREQ_HIGH;
gpioSPIInitStr.Pull = LL_GPIO_PULL_UP;
gpioSPIInitStr.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
LL_GPIO_Init(GPIOA, &gpioSPIInitStr);
/* Pin A6 (MISO) must be configured as as input pull-up*/
LL_GPIO_StructInit(&gpioSPIInitStr);
gpioSPIInitStr.Pin = LL_GPIO_PIN_6;
gpioSPIInitStr.Mode = LL_GPIO_MODE_INPUT; //LL_GPIO_MODE_ALTERNATE;
gpioSPIInitStr.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
LL_GPIO_Init(GPIOA, &gpioSPIInitStr);
/*NSS Pin Config */
LL_GPIO_InitTypeDef SPI_SSPIN_Struct;
SPI_SSPIN_Struct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
SPI_SSPIN_Struct.Pin = LL_GPIO_PIN_4;
SPI_SSPIN_Struct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
LL_GPIO_Init(GPIOA, &SPI_SSPIN_Struct);
LL_GPIO_SetOutputPin(GPIOA, LL_GPIO_PIN_4);SPI2 Slave module is configured so:
/** MASTER SLAVE
* ********** **********
* PA4 - NSS PB12 - NSS
* PA5 - SCK PB13 - SCK
* PA6 - MISO PB15 - M0SI
* PA7 - MOSI PB14 - MISO
*/
__HAL_RCC_SPI2_CLK_ENABLE();
LL_SPI_InitTypeDef SPI_SlaveInitStruct;
SPI_SlaveInitStruct.BaudRate = LL_SPI_BAUDRATEPRESCALER_DIV4;
SPI_SlaveInitStruct.ClockPhase = LL_SPI_PHASE_2EDGE;
SPI_SlaveInitStruct.ClockPolarity = LL_SPI_POLARITY_HIGH;
SPI_SlaveInitStruct.CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE;
SPI_SlaveInitStruct.DataWidth = LL_SPI_DATAWIDTH_8BIT;
SPI_SlaveInitStruct.TransferDirection = LL_SPI_FULL_DUPLEX;
SPI_SlaveInitStruct.BitOrder = LL_SPI_MSB_FIRST;
SPI_SlaveInitStruct.Mode = LL_SPI_MODE_SLAVE;
SPI_SlaveInitStruct.NSS = LL_SPI_NSS_HARD_INPUT;
LL_SPI_Init(SPI2, &SPI_SlaveInitStruct);
LL_SPI_Enable(SPI2);
LL_I2S_EnableIT_RXNE(SPI2);
HAL_NVIC_SetPriority(SPI2_IRQn, 0 , 0 );
HAL_NVIC_EnableIRQ(SPI2_IRQn);Slave GPIO is configured so:
/** MASTER SLAVE
* ********** **********
* PA4 - NSS PB12 - NSS
* PA5 - SCK PB13 - SCK
* PA6 - MISO PB15 - M0SI
* PA7 - MOSI PB14 - MISO
*/
if (RESET == __HAL_RCC_GPIOB_IS_CLK_ENABLED())
{
__HAL_RCC_GPIOB_CLK_ENABLE();
}
LL_GPIO_InitTypeDef gpioSPIInitStr;
gpioSPIInitStr.Alternate = LL_GPIO_AF_5;
gpioSPIInitStr.Pin = LL_GPIO_PIN_13 | LL_GPIO_PIN_15;
gpioSPIInitStr.Mode = LL_GPIO_MODE_ALTERNATE;
gpioSPIInitStr.Speed = LL_GPIO_SPEED_FREQ_HIGH;
gpioSPIInitStr.Pull = LL_GPIO_PULL_UP;
gpioSPIInitStr.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
LL_GPIO_Init(GPIOB, &gpioSPIInitStr);
gpioSPIInitStr.Alternate = LL_GPIO_AF_5;
gpioSPIInitStr.Pin = LL_GPIO_PIN_14;
gpioSPIInitStr.Mode = LL_GPIO_MODE_ALTERNATE;
gpioSPIInitStr.Speed = LL_GPIO_SPEED_FREQ_HIGH;
gpioSPIInitStr.Pull = LL_GPIO_PULL_UP;
gpioSPIInitStr.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
LL_GPIO_Init(GPIOB, &gpioSPIInitStr);
gpioSPIInitStr.Alternate = LL_GPIO_AF_5;
gpioSPIInitStr.Pin = LL_GPIO_PIN_12; //NSS
gpioSPIInitStr.Mode = LL_GPIO_MODE_INPUT;
gpioSPIInitStr.Pull = LL_GPIO_PULL_NO;
gpioSPIInitStr.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
LL_GPIO_Init(GPIOB, &gpioSPIInitStr);This is what i do forever in main function:
SPI_Master_Tx_Data(0xA5);
Delay_us(100);
SPI_Master_Tx_Data(0xCF);
Delay_us(100);The Interrupt handler looks very rudimentary at the moment, i am reading 0xFF in the SPI2 Data Register when i debug everytime while i expect 0xA5 and 0xCF:
void SPI2_IRQHandler( void ) {
uint8_t irq_var1= 0 ;
irq_var1 = SPI2->DR;
}Transmit function from master looks so:
SPI_MASTER_CHIP_SEL_LOW();
while (!LL_SPI_IsActiveFlag_TXE(SPI1))
; // wait while not empty
LL_SPI_TransmitData8(SPI1, TXData); //send data.
while (LL_SPI_IsActiveFlag_BSY(SPI1))
; // wait until the bus is no longer busy
SPI_MASTER_CHIP_SEL_HIGH(); // slave deselect (high)This is what i see on the Oscilloscope. Also the Slave signal looks very strange.
Can someone please point out or give helpful tips why this is not working as expected?
