Problem with SPI

[j3lda]

Posted on March 20, 2013 at 15:29

Hello, I´m using STM32F303 and I´m trying to communicate via SPI (simplex SPI1-SPI2 using interrupts). It couldn´t be easier but it doesn´t work and I can´t find mistake. I connect PB3 (SPI1_SCK) with PB13(SPI2_SCK) and PB5(SPI1_MOSI) with PB14(SPI2_MISO) but it doesn´t generate interrupts. Here is my code. Thanks a lot for your help.

/* Private variables ---------------------------------------------------------*/ NVIC_InitTypeDef      NVIC_InitStructure; GPIO_InitTypeDef      GPIO_InitStructure; __IO uint32_t TimDelay = 0; uint8_t SPI_MASTER_Buffer_Tx[]={1}; uint8_t ReceivedData; /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*/ void SPI_Ini(void); int main(void) {     SPI_Ini();     /* GPIOE Periph clock enable */    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE, ENABLE);         /* Configure PE.9 (LED) */    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 ;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_Init(GPIOE, &GPIO_InitStructure);          while(1){              /* Send SPI_MASTER data */        SPI_SendData8(SPI1, SPI_MASTER_Buffer_Tx[0]);                 if(ReceivedData!=0)GPIOE->BSRR = 0x200; // LED on                 for(TimDelay=0; TimDelay < 100000; TimDelay++);            } } void SPI_Ini(void) {          SPI_InitTypeDef  SPI_InitStructure;          /* Enable GPIOB for SCK, MISO, MOSI GPIO clocks */    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);          /* Enable the SPI1 periph */    RCC_APB1PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);          /* Enable the SPI2 periph */    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);       /*----------------------Inicialization SPI master------------------------------------*/          /* SPI1 SCK pin configuration: AF PP output 50MHz  */    GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_5);  // PB3: SPI1 SCK    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;            // alternate mode    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    // 50MHz    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;         // push pull output    //GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;    GPIO_Init(GPIOB, &GPIO_InitStructure);          /* SPI1  MOSI pin configuration: AF PP output 50MHz */     GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_5); // PB5: SPI1 MOSI     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;                 // alternate mode     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;         // 50MHz     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;              // push pull output     //GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;     GPIO_Init(GPIOB, &GPIO_InitStructure);   /* SPI1 configuration -------------------------------------------------------*/   SPI_I2S_DeInit(SPI1);   SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;   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_2;   SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;   SPI_InitStructure.SPI_CRCPolynomial = 7;   SPI_InitStructure.SPI_Mode = SPI_Mode_Master;   SPI_Init(SPI1, &SPI_InitStructure);          /*----------------------Inicialization SPI slave------------------------------------*/       /* SPI2 SCK pin configuration: input mode 50MHz */     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;             // input mode     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    // 50MHz     //GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;     GPIO_Init(GPIOB, &GPIO_InitStructure);          /* SPI2 MISO pin configuration: AF PP output 50MHz */     GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_5); // PB14: SPI2 MISO     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;            // alternative mode     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    // 50MHz     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;         // push pull output     //GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;     GPIO_Init(GPIOB, &GPIO_InitStructure);          /* SPI2 configuration -------------------------------------------------------*/     SPI_I2S_DeInit(SPI2);     SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;     SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;     SPI_Init(SPI2, &SPI_InitStructure);          /* Enable the Rx buffer not empty interrupt */     SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, ENABLE);          /* Configure the SPI interrupt priority */    NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQn;    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;    NVIC_Init(&NVIC_InitStructure);          /* Enable the SPI peripheral */    SPI_Cmd(SPI2, ENABLE);          /* Enable the SPI peripheral */    SPI_Cmd(SPI1, ENABLE);   } void SPI2_IRQHandler(void) {     /* SPI in Slave Receiver mode--------------------------------------- */    if (SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_RXNE) == SET)   {         ReceivedData = SPI_ReceiveData8(SPI2);   } }  

[Tesla DeLorean]

Posted on March 20, 2013 at 16:49

A Master MOSI (output) needs to go to a Slave MOSI (input)

You should wait for TXE before sending data. Config clock and data output with a scope. RCC_APB1PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); // APB2!!

[j3lda]

Posted on March 20, 2013 at 18:01

Thanks Clive. I would never have found mistake APB1->APB2. I fix code according your ideas. It is sending data now, but still not receiving (SPI2 handler is not called).

Are you sure that I would use MOSI instead of MISO in slave? For example in reference manual for STM32F10x and this application note (page 5): 

http://read.pudn.com/downloads106/sourcecode/embed/437624/stm32/STM32F%20Documents/Application%20Note/STM32F10xxx%20SPI%20application%20examples.pdf

is written that in simplex mode should be connected MOSI (master) with MISO (slave). I thing that mistake should be in setting pull ups/down, I don´t undertad where use PU or PD or no PUPD. Thank you for answer. int main(void) {     SPI_Ini();       /* Enable SPI_MASTER TXE interrupt */       SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE, ENABLE);//**********************************************             /* Enable the Rx buffer not empty interrupt */       SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, ENABLE);              /* Enable the SPI peripheral */        SPI_Cmd(SPI2, ENABLE);             /* Enable the SPI peripheral */        SPI_Cmd(SPI1, ENABLE);             while(1){  } } void SPI_Ini(void) {          SPI_InitTypeDef  SPI_InitStructure;        /* Enable GPIOB for SCK, MISO, MOSI GPIO clocks */   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);         /* Enable the SPI1 periph */   RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);         /* Enable the SPI2 periph */   RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);       /*--------+-------------Inicializace SPI master------------------------------------*/          /* SPI1 SCK pin configuration: AF PP output 50MHz  */   GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_5); // PB3: SPI1 SCK   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;         // alternate mode   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    // 50MHz   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;       // push pull output   //GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;//???????????????????????????????   GPIO_Init(GPIOB, &GPIO_InitStructure);          /* SPI1  MOSI pin configuration: AF PP output 50MHz */   GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_5); // PB5: SPI1 MOSI   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;         // alternate mode   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    // 50MHz   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;       // push pull output   //GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;//??????????????????????????????   GPIO_Init(GPIOB, &GPIO_InitStructure);   /* SPI1 configuration -------------------------------------------------------*/   SPI_I2S_DeInit(SPI1);   SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;   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_2;   SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;   SPI_InitStructure.SPI_CRCPolynomial = 7;   SPI_InitStructure.SPI_Mode = SPI_Mode_Master;   SPI_Init(SPI1, &SPI_InitStructure);         /*--------+-------------Inicialization SPI slave------------------------------------*/     /* SPI2 SCK pin configuration: input mode 50MHz */   //GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_5);   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;  // input mode   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    // 50MHz   //GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;//??????????????????????????   GPIO_Init(GPIOB, &GPIO_InitStructure);         /* SPI2 MOSI pin configuration: input 50MHz */   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;              // PB15: SPI2 MOSI   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;         // alternative mode   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    // 50MHz   //GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;       // push pull output   //GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;//??????????????????????????????   GPIO_Init(GPIOB, &GPIO_InitStructure);          /* SPI2 configuration -------------------------------------------------------*/   SPI_I2S_DeInit(SPI2);   SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;    SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;   SPI_Init(SPI2, &SPI_InitStructure);         /* Configure the Priority Group to 1 bit */                   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);         /* Configure the SPI interrupt priority */   NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   NVIC_Init(&NVIC_InitStructure);          /* Configure the SPI interrupt priority */   NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQn;   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   NVIC_Init(&NVIC_InitStructure);   } void SPI2_IRQHandler(void)//***********************************never called {     /* SPI in Slave Receiver mode--------------------------------------- */     if (SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_RXNE) == SET)     {         ReceivedData = SPI_ReceiveData8(SPI2);     } } void SPI1_IRQHandler(void) {       if (SPI_I2S_GetITStatus(SPI1, SPI_I2S_IT_TXE) != RESET)   {         SPI_SendData8(SPI1, SPI_MASTER_Buffer_Tx[TxIdx++]);                  if (TxIdx == 4)        {           SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE, DISABLE);         }     } }

[Tesla DeLorean]

Posted on March 20, 2013 at 18:07

Not sure how the 1 wire settings impact things, MOSI (Master Out, Slave In) are common in the 2 wire modes. What does the manual say?

[j3lda]

Posted on March 20, 2013 at 18:14

SPIx_MOSI | Simplex bidirectional data wire/ slave  | Not used. Can be used as a GPIO

SPIx_MISO | Simplex bidirectional data wire/ slave  | (point to point) AF push-pull

[Tesla DeLorean]

Posted on March 20, 2013 at 18:24

Do you see any data on the wire with a scope?

The pull-up is irrelevant in PP (Push-Pull) mode, the pin is driven actively in both directions when in output mode. In input mode it's also not going to make any difference when it's connected to a PP driver.

[j3lda]

Posted on March 22, 2013 at 15:53

Yes, data looks fine on Scope. But when I simulate SCK (I give 3V on SCK_slave) it works....

I am lost :( But clock signal is sinus.... and I think that it should be square.... But I have SCK pins directly connected by wire...