SPI_Driver.c

#include "stm32f10x.h"
#include "GPIO_Driver.h"
#include "SPI_drive.h"
#include "delay.h"

void spi_write(char data)
{
        uint8_t dumby_read = 0;

        dumby_read = (uint8_t) SPI1->DR; //this is neccessary to prevent OVR errors

        SPI1->DR = data;

        while( SPI1->SR != 0x0002 )
        {
            dumby_read = (uint8_t) SPI1->DR;
        }

}


uint8_t spi_read()
{
    return (uint8_t) SPI1->DR;
}

void spi_init_master()
{
    //enable clocks for SPI1, PORTA, and Alternate Function IO
    RCC->APB2ENR |= RCC_APB2ENR_SPI1EN | RCC_APB2ENR_IOPAEN | RCC_APB2ENR_AFIOEN;

    //configure the MOSI pin
    GPIO_TYPE MOSI;
    MOSI.port = PORTA;
    MOSI.pin = 7;
    MOSI.mode = OUTPUT;
    MOSI.mode_type = OUTPUT_ALT_FUNCTION;
    MOSI.speed = SPEED_10MHZ;

    //configure the MISO pin
    GPIO_TYPE MISO;
    MISO.port = PORTA;
    MISO.pin = 6;
    MISO.mode = INPUT;
    MISO.mode_type = INPUT_PU_PD;

    //configure the SCK pin
    GPIO_TYPE SCK;
    SCK.port = PORTA;
    SCK.pin = 5;
    SCK.mode = OUTPUT;
    SCK.mode_type = OUTPUT_ALT_FUNCTION;
    SCK.speed = SPEED_10MHZ;

    //initialize all of the pins

    init_gpio(MOSI);
    init_gpio(MISO);
    init_gpio(SCK);

    //confiure SPI1 for master
    SPI1->CR1 |= SPI_CR1_SSM | SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0 | SPI_CR1_MSTR;
    SPI1->CR2 |= SPI_CR2_SSOE;

    //enable SPI
    SPI1->CR1 |= SPI_CR1_SPE;

}