#include "Libraries/stm32l1xx_nucleo/stm32l1xx_nucleo.h"

#define clockmask 1<<5;
#define datamask 1<<7;
#define max7219load 1<<8;
#define Chip_Load   GPIOA->BSRRH |= max7219load;  //%10000000; CS=0
#define Chip_UnLoad GPIOA->BSRRL |= max7219load;  //%01111111; CS=1

void configInterruptionPB0(void);
void configInterruptionUserButton(void);
void EXTI0_IRQHandler(void);
void EXTI15_10_IRQHandler(void);
void temporisation(uint16_t t);
void SendData(uint8_t data);
static void SPI_write(uint8_t add, uint8_t data);

uint16_t cpt = 0;
uint16_t nombre = 4532;
uint8_t m,c,d,u;

int main(){

  /* Réglage de l'horloge sur le périphérique GPIOB et GPIOA*/
  RCC->AHBENR |= RCC_AHBPeriph_GPIOA;
  RCC->AHBENR |= RCC_AHBPeriph_GPIOB;
  /* Configuration du bits PB0, en tant qu'entrée et des bits PA0 à PA15 en tant que sortie */
  GPIOA->MODER |= 0x55555555;
  GPIOB->MODER |= 0x00000000;
 /* Configuration de GPIOA et GPIOB en mode Push/Pull */
  GPIOA->OTYPER |= 0x00000000;
  GPIOB->OTYPER |= 0x00000000;
  /* Configuration de GPIOA et GPIOB en haute vitesse */
  GPIOA->OSPEEDR |= 0xFFFFFFFF;
  GPIOB->OSPEEDR |= 0xFFFFFFFF;

  /* Utilisation de 4 digits sur les 8 */
  SPI_write(0x0B,0x03); //Scan Limit (0x0B) = 0x03;
  /* Réglage de l'intensité d'affichage */
  SPI_write(0x0A,0x0F); //Intensity (0x0A) = 0x0F;  intensité maximale, voir consommation
  /* Activation du décodage */
  SPI_write(0x09,0xDF); //Decode Mode (0x09) = 0xDF; Décodage pour Digit 0-3
  /* Écriture des valeurs des digits 0 à 3 */
  //SPI_write(0x01,0x01); //Digit 0 (0x01) = 0x00;
  //SPI_write(0x02,0x01); //Digit 1 (0x02) = 0x01;
  //SPI_write(0x03,0x01); //Digit 2 (0x03) = 0x02;
  //SPI_write(0x04,0x01); //Digit 3 (0x04) = 0x03;
  /* Allumage de l'affichage*/
  //SPI_write(0x0C,0x01); //Shutdown (0x0C)= 0x01;

  //configInterruptionPB0();
  configInterruptionUserButton();

  while(1){

    m = nombre/1000;
    nombre%= 1000;
    c = nombre/100;
    nombre%= 100;
    d = nombre/10;
    nombre%= 10;
    u = nombre;

    SPI_write(0x01,m);
    SPI_write(0x02,c);
    SPI_write(0x03,d);
    SPI_write(0x04,u);
    SPI_write(0x0C,0x01);
  }

 }

 void SendData(uint8_t data)
{
uint8_t LOOP, FLAG;
    GPIOA->BSRRH |= clockmask;//SH_CLK = 0;
 for (LOOP=0; LOOP<8; LOOP++){
    GPIOA->BSRRH |= 1<<5;//SH_CLK = 0;
    FLAG=data&0x80;//because max7219 need MSb first !!
    if(FLAG==0){ GPIOA->BSRRH |= datamask;}// data=0
    else       { GPIOA->BSRRL |= datamask;}// data=1
    data <<= 1;
    GPIOA->BSRRL |= clockmask;//SH_CLK = 1;
    //delay();
    }
 }

 static void SPI_write(uint8_t add, uint8_t data)
{
  Chip_UnLoad;//1
  Chip_Load;//0
  SendData(add);
  SendData(data);
  Chip_UnLoad;//1
}

 /* Configuration d'une interruption sur la pin PB0 */
 void configInterruptionPB0(void)
{
  NVIC->ISER[0] |= (1<<6);
  RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
  SYSCFG->EXTICR[0] |= SYSCFG_EXTICR1_EXTI0_PB;
  EXTI->FTSR |= EXTI_FTSR_TR0;
  EXTI->IMR |= EXTI_IMR_MR0;
}

/* Configuration d'une interruption sur le bouton USER PC_13 */
 void configInterruptionUserButton(void)
{
  NVIC->ISER[1] |= (1<<8);
  RCC -> APB2ENR |= RCC_APB2ENR_SYSCFGEN;
  SYSCFG->EXTICR[3] |=SYSCFG_EXTICR4_EXTI13_PC;
  EXTI->FTSR |= EXTI_FTSR_TR13;
  EXTI->IMR |= EXTI_IMR_MR13;
}

/* Routine d'interruption pour le bouton USER PC_13 */
void  EXTI15_10_IRQHandler(void)
{
  EXTI->PR |= EXTI_PR_PR13;
  cpt++;
}

/* Routine d'interruption pour PB0 */
void EXTI0_IRQHandler(void)
{
  EXTI->PR |= EXTI_PR_PR0;
  cpt++;
}

/* Temporisation de t instructions */
void temporisation(uint16_t t)
{
  uint16_t i;
  for(i=0;i<t;i++)
  {
  }
}