Developing the SPI driver

Create a copy of your previous project in your IDE and rename this copied project to SPI. Next, create a new file named spi.c in the Src folder and another file named spi.h in the Inc folder. Populate your spi.c file with the following code:

#include "spi.h" 
#define SPI1EN            (1U<<12)
#define GPIOAEN            (1U<<0)
#define SR_TXE            (1U<<1)
#define SR_RXNE            (1U<<0)
#define SR_BSY            (1U<<7)
void spi_gpio_init(void)
{
    /*Enable clock access to GPIOA*/
    RCC->AHB1ENR |= GPIOAEN;
    /*Set PA5,PA6,PA7 mode to alternate...