/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Programme de DEMO sur la carte KItSTM32L476 IUT1
  ******************************************************************************
  * @author			: Manuel Alejandro Baez Ponce
  ******************************************************************************
  */


/* Includes ------------------------------------------------------------------*/
#include "stdio.h" 				//pour sprintf ?
#include "string.h"				//pour strlen
#include "stm32l4xx.h"			//qui inclus stm32l476xx.h avec les defs de registres

/*Prototypes fonctions de system_stm32l4xx.c*/
extern void SystemCoreClockUpdate(void);

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void init_GPIO(void);
void init_USART2(void);
void init_ADC1(void);
char read_USART2(void);
void write_USART2(char dato);
char read_ADC1(void);

int main(void) {
	SystemClock_Config();
	init_GPIO();
	// init_TIM();
	init_USART2();
	char saludo[] = "0123456789";
	char dato = 0;

	for (int i=0; saludo[i]!='\0'; i++){
		write_USART2(saludo[i]);
	}

	while (1) {
		dato = read_USART2();
		write_USART2(dato);
	}
}


/***************************************************/
/********FONCTIONS D'INIT**********/

void SystemClock_Config(void){
	RCC->CR &= 0x000000F1;
	while((RCC->CR & RCC_CR_MSIRDY) == 0);
	RCC->CR |= RCC_CR_MSIRGSEL;
	RCC->CR &= 0xFFFFFF7F;
	RCC->CR |= 0x70;

	RCC->CR &= ~RCC_CR_PLLON;
	while((RCC->CR & RCC_CR_PLLRDY) !=0 );
	RCC->PLLCFGR = (10<<8) | RCC_PLLCFGR_PLLSRC_MSI;
	RCC->CR |= RCC_CR_PLLON;
	RCC->PLLCFGR |= RCC_PLLCFGR_PLLREN;
	RCC->CFGR = RCC_CFGR_SW_PLL;

	SystemCoreClockUpdate();
}

void init_GPIO(void){
	RCC->AHB2ENR |= 0x00002001;
	RCC->APB1ENR1 |= RCC_APB1ENR1_USART2EN;
	RCC->CCIPR &= ~RCC_CCIPR_USART2SEL;
	GPIOA->MODER &= 0xFFFFFF0C;
	GPIOA->MODER |= 0x000000A3;
	GPIOA->AFR[0] &= 0xFFFF00FF;
	GPIOA->AFR[0] |= 0x00007700;
}

void init_USART2(void){ // Configuración del modulo UART2
	//USART1_IRQn
	USART2->CR1 &= ~USART_CR1_UE;
	USART2->CR1 &= 0xE3FF0A0C;
	USART2->CR1 |= 0x0000000C;
	USART2->CR2 &= 0xFF60008F;
	USART2->CR2 |= 0x00000000;
	USART2->CR3 &= 0xFE0F0800;
	USART2->CR3 |= 0x00000000;
	USART2->BRR &= 0x00000000;
	USART2->BRR |= 0x0000208D;
	USART2->CR1 |= USART_CR1_UE;
}

void init_ADC1(void){
	ADC1->CR &= ~ADC_CR_ADEN;
	ADC1->CR &= 0x9FFFFFC0;
	ADC1->CR |= 0x10000000;
	ADC1->CFGR &= 0xFC40A3CF;
	ADC1->CFGR |= 0x80002000;
	ADC1->CFGR2 &= 0xFFFFFFFF;
	ADC1->CFGR2 |= 0x00000000;
}

char read_USART2(void){
	while (!(USART2->ISR & USART_ISR_RXNE));
	char dato = (char)(USART2->RDR & 0x000000FF);
	return dato;
}

void write_USART2(char dato){
	while (!(USART2->ISR & USART_ISR_TXE));
	USART2->TDR = (int) dato;
}

char read_ADC1(void){

}