SPI

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Please pay attention to the simple, clearly-stated instructions for posting source code - look at this picture: www.danlhenry.com/.../keil_code.png

#include <stdio.h>
#include "stm32f0xx.h"
#include "stm32f0xx_gpio.h"
#include "stm32f0xx_it.h"
#include "stm32f0xx_rcc.h"

#include "stm32f0xx_usart.h"
#include "stm32f0xx_conf.h"
#include "stm32f0xx_adc.h"
#include "stm32f0xx_i2c.h"

#include "math.h"
#include "string.h"
#include "main.h"

#include "main.h"

void spiInit(void);

void spiInit()
{ SPI_InitTypeDef SPI_InitStructure; GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB ,ENABLE); RCC_APB2PeriphClockCmd (RCC_APB2Periph_SPI1, ENABLE);

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; SPI_InitStructure.SPI_Mode = SPI_Mode_Master; 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_Hard; SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;//32 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStructure.SPI_CRCPolynomial = 7;

///////////////////////////////////////////////////////////////////////////// // SPI1 Master initialization, SCK -> PA5, MOSI -> PA7 GPIO_StructInit (&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ; //PuPd_UP GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0); GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);

// MISO -> PA6 GPIO_StructInit (&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_0);

// CS or SS chip select -> PA4 GPIO_StructInit (&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ; GPIO_Init(GPIOA, &GPIO_InitStructure);

// SPI1 SPI_Init(SPI1, &SPI_InitStructure); SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF); SPI_SSOutputCmd(SPI1,ENABLE); SPI_Cmd(SPI1, ENABLE);

}

void ChipSelectLow()
{ GPIO_WriteBit(GPIOA, GPIO_Pin_4, Bit_RESET);
}

void ChipSelectHigh ()
{ GPIO_WriteBit(GPIOA, GPIO_Pin_4, Bit_SET);
}

uint8_t SPI1_send(uint8_t data){

SPI1->DR = data; // write data to be transmitted to the SPI data register while( !(SPI1->SR & SPI_I2S_FLAG_TXE) ); // wait until transmit complete while( !(SPI1->SR & SPI_I2S_FLAG_RXNE) ); // wait until receive complete while( SPI1->SR & SPI_I2S_FLAG_BSY ); // wait until SPI is not busy anymore return SPI1->DR; // return received data from SPI data register
}

int main()
{ while (1) { spiInit();

ChipSelectHigh (); ChipSelectLow (); SPI_SendData8(SPI1 , 0x55); while( !(SPI1->SR & SPI_I2S_FLAG_TXE) ); // wait until transmit complete while( !(SPI1->SR & SPI_I2S_FLAG_RXNE) ); // wait until receive complete while( SPI1->SR & SPI_I2S_FLAG_BSY ); // wait until SPI is not busy anymore ChipSelectHigh (); }

}