/*
**
**                           Main.c
**
**
**********************************************************************/
/*
   Last committed:     $Revision: 00 $
   Last changed by:    $Author: $
   Last changed date:  $Date:  $
   ID:                 $Id:  $

**********************************************************************/
#include "stm32f30x_conf.h"
#include "30021_io.h"
void init_SPI3(){



    // Enable Clocks
    RCC->AHBENR  |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOCEN;    // Enable Clock for GPIO Banks A and B
    RCC->APB1ENR |= RCC_APB1ENR_SPI3EN;                 // Enable Clock for SPI2

    // Connect pins to SPI2
    GPIOC->AFR[1] &= ~(GPIO_AFRH_AFRH2); // Clear alternate function for PC10
    GPIOC->AFR[1] |= (6 << 4*2); // Set alternate 5 function for PC10 - SCLK
    GPIOC->AFR[1] &= ~(GPIO_AFRH_AFRH3); // Clear alternate function for PC11
    GPIOC->AFR[1] |= (6 << 4*3);
    GPIOC->AFR[1] &= ~(GPIO_AFRH_AFRH4); // Clear alternate function for PC12
    GPIOC->AFR[1] |= (6 << 4*4);
    GPIOA->AFR[1] &= ~(GPIO_AFRH_AFRH7); // Clear alternate function for PA15
    GPIOA->AFR[1] |= (6 << 4*7);

    // Configure pins PB13 and PB15 for 10 MHz alternate function
    GPIOC->OSPEEDR &= ~ (GPIO_OSPEEDER_OSPEEDR10  | GPIO_OSPEEDER_OSPEEDR11 | GPIO_OSPEEDER_OSPEEDR12);  // Clear speed register
    GPIOC->OSPEEDR |=  (GPIO_OSPEEDER_OSPEEDR10_0 | GPIO_OSPEEDER_OSPEEDR11_0 | GPIO_OSPEEDER_OSPEEDR12_0);    // set speed register (0x01 - 10 MHz, 0x02 - 2 MHz, 0x03 - 50 MHz)
    GPIOC->OTYPER  &= ~ (GPIO_OTYPER_OT_10 | GPIO_OTYPER_OT_11 | GPIO_OTYPER_OT_12);        // Clear output type register
    GPIOC->MODER   &= ~ (GPIO_MODER_MODER10 | GPIO_MODER_MODER11 | GPIO_MODER_MODER12);// Clear mode register
    GPIOC->MODER   |=  ((GPIO_MODER_MODER10_1) | (GPIO_MODER_MODER11_1) | (GPIO_MODER_MODER12_1));    // Set mode register (0x00 - Input, 0x01 - Output, 0x02 - Alternate Function, 0x03 - Analog in/out)
    GPIOC->PUPDR   &= ~((GPIO_PUPDR_PUPDR10) | (GPIO_PUPDR_PUPDR11) | (GPIO_PUPDR_PUPDR12));    // Clear push/pull register
    GPIOC->PUPDR   |=  ((GPIO_PUPDR_PUPDR10_1) | (GPIO_PUPDR_PUPDR11_1) | (GPIO_PUPDR_PUPDR12_1));

    GPIOA->OSPEEDR &= ~ (GPIO_OSPEEDER_OSPEEDR15);
    GPIOA->OSPEEDR |= (GPIO_OSPEEDER_OSPEEDR15_0);
    GPIOA->OTYPER  &= ~ (GPIO_OTYPER_OT_15);
    GPIOA->MODER   &= ~ (GPIO_MODER_MODER15);
    GPIOA->MODER   |=  (GPIO_MODER_MODER15_0);
    GPIOA->PUPDR   &= ~(GPIO_PUPDR_PUPDR15);
    GPIOA->PUPDR   |=  (GPIO_PUPDR_PUPDR15_1);



    GPIOA->ODR |=  GPIO_ODR_15; // CS = 1

    // Configure SPI3
    SPI3->CR1 &= 0x3040; // Clear CR1 Register
    SPI3->CR1 |= 0x0000; // Configure direction (0x0000 - 2 Lines Full Duplex, 0x0400 - 2 Lines RX Only, 0x8000 - 1 Line RX, 0xC000 - 1 Line TX)
    SPI3->CR1 |= 0x0104; // Configure mode (0x0000 - Slave, 0x0104 - Master)
    SPI3->CR1 |= 0x0002; // Configure clock polarity (0x0000 - Low, 0x0002 - High)
    SPI3->CR1 |= 0x0001; // Configure clock phase (0x0000 - 1 Edge, 0x0001 - 2 Edge)
    SPI3->CR1 |= 0x0200; // Configure chip select (0x0000 - Hardware based, 0x0200 - Software based)
    SPI3->CR1 |= 0x0028; // Set Baud Rate Prescaler (0x0000 - 2, 0x0008 - 4, 0x0018 - 8, 0x0020 - 16, 0x0028 - 32, 0x0028 - 64, 0x0030 - 128, 0x0038 - 128)
    SPI3->CR1 |= 0x0000; // Set Bit Order (0x0000 - MSB First, 0x0080 - LSB First)

    SPI3->CR2 &= ~0x0F00; // Clear CR2 Register
    SPI3->CR2 |= 0x0700; // Set Number of Bits (0x0300 - 4, 0x0400 - 5, 0x0500 - 6, ...);
    SPI3->I2SCFGR &= ~0x0800; // Disable I2S

    SPI3->CR2 &= ~0x1000;
    SPI3->CR2 |= 0x1000; // Configure RXFIFO return at (0x0000 - Half-full (16 bits), 0x1000 - Quarter-full (8 bits))
    SPI3->CR1 |= SPI_CR1_SPE; // Enable SPI3


}

void spi3_transmit_byte(uint8_t data) {
    //GPIOA->ODR &= ~GPIO_ODR_15; // CS = 0 - Start Transmission
    while(SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_TXE) != SET) { }
    SPI3->DR = data;
    while(SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_TXE) != SET) { }
    while(SPI3->SR & SPI_SR_BSY);
    //for (int i=0;i<10000;i++);
    //GPIOA->ODR |=  GPIO_ODR_15; // CS = 1 - End Transmission
}

int main(void){
    init_usb_uart(115200);
    init_SPI3();
  //  init_spi_lcd();
    while(1){

        printf("Hello world!\n");
        for (int i=0;i<100000;i++){
        }
GPIOA->ODR &= ~ GPIO_ODR_15;
spi3_transmit_byte(0b00110100);
GPIOA->ODR |= GPIO_ODR_15;
 //lcd_transmit_byte('G');
  }
}