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F103 and F072 SPI communication

Question asked by ionut.fasola on Jan 3, 2017
Latest reply on Jan 3, 2017 by Khouloud G

I am trying to communicate with a device (a radio module which has inside STM32F103 MCU ) with my STM32f072B disco board using SPI 

I can program the radio module almost as a standard STM32 MCU the only difference is that I don't have access to all pins.

Disco board is set as master, the RF module is a slave.

Both devices run at 16MHz; SPI prescaler is 256, 8bit data size, H polarity, 2edge phase, soft management of nss

I managed so far to output the clock signal but I don't have nothing on the MOSI line, allthough I'm sending data

I am not fully cleared about how the pins must be configured

The program for disco board:

 

#include "stm32f0xx.h"

#define u8 uint8_t
#define u16 uint16_t
typedef uint32_t u32;
typedef signed short s8;

void spi1_config(void);
void delay(uint32_t t);

#define NSS_Port GPIOA
#define NSS_Pin GPIO_Pin_4

/* Private macro -------------------------------------------------------------*/
#define NSS_hi() NSS_Port->BSRR = NSS_Pin
#define NSS_lo() NSS_Port->BRR = NSS_Pin
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/
u8 t=0;
extern u8 h;
extern u8 y;
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
spi1_config();

NSS_hi();
while(1)
{
delay(100);
NSS_lo();
delay(150);

SPI_SendData8(SPI1,0xab);
delay(200);
NSS_hi();
}
}

void spi1_config(void)//master
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
SPI_InitTypeDef SPI_InitStructure;

/* Enable the SPI periph */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

/* Enable SCK, MOSI, MISO and NSS GPIO clocks */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA , ENABLE);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;

/* SPI SCK MOSI MISO pins configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* SPI NSS pin configuration as GPIO Pin */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_0);

/* SPI configuration -------------------------------------------------------*/
SPI_I2S_DeInit(SPI1);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_InitStructure.SPI_Mode=SPI_Mode_Master;

SPI_Init(SPI1, &SPI_InitStructure);

/* Initialize the FIFO threshold */
SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF);

SPI_NSSPulseModeCmd(SPI2,DISABLE);
SPI_SSOutputCmd(SPI2,DISABLE);

/* Enable the Rx buffer not empty interrupt */
SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, ENABLE);

/* Configure the SPI interrupt priority */
NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = !ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* Enable the SPI peripheral */
SPI_Cmd(SPI1, ENABLE);
}

void delay(uint32_t t)
{
for(;t!=0;t--)
{
asm("nop");
}
}

 

I can't see anything moving on the MOSI pin; only the SCK and NSS

 

Here is the code for the STM32F103 MCU

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#include "stm32f10x.h"

GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

u16 t=0;
int main(void)
{
//GPIOA,GPIOB,GPIOC, USART1,SPI1 Periph clock enable
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_USART1|RCC_APB2Periph_SPI1, ENABLE);
// USART2, I2C1, CAN1 Periph clock enable
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB1Periph_I2C1|RCC_APB1Periph_CAN1|RCC_APB1Periph_TIM2,ENABLE);

spi1_config();
while (1)
{
asm("nop");
}

}

void spi1_config(void)//slave
{
//3. Configurare SPI1...............................................................
//Configure SPI1 pins: SCK, MISO and MOSI ----------

//Configure SCK, MOSI and NSS pins as floating inputs
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7|GPIO_Pin_4;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);

// Configure MISO (slave out) pin as AF Push pull
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//SPI1 configuration ----------
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_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

//Disable SPI1 CRC calculation
SPI_CalculateCRC(SPI1, DISABLE);

NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = !ENABLE;
NVIC_Init(&NVIC_InitStructure);

SPI_I2S_ITConfig(SPI1,SPI_I2S_IT_RXNE,ENABLE);

//Enable SPI1
SPI_Cmd(SPI1, ENABLE);
}

void delay(uint32_t t)
{

for(; t != 0; t--){};
}

Outcomes