/**
 ******************************************************************************
 * @file           : main.c
 * @author         : Auto-generated by STM32CubeIDE
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2026 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */

#include <stdint.h>
#include "stm32f103xb.h"

void display(int num);
void delay_ms(uint16_t t);

int main(void)
{
	// Enable GPIOA clock
	RCC->APB2ENR |= 1UL << 2;

	// Set PA0-PA6 as 2MHz push-pull output
	GPIOA->CRL &= (0xF0000000); // Clear fields
	GPIOA->CRL |= 0x02222222; // MODEn = 10 (2MHz Output)

	// PA<6:0> = 1
	GPIOA->ODR |= 0x0000007F;

	// Loop
	int n = 0;
	while ( 1 )
	{
		display(n++);
		if(n > 9) n = 0;
		delay_ms(1000);
	}
}




void display(int num)
{
	GPIOA->ODR &= ~0x0000007F;
	switch(num)
	{
		case 0: GPIOA->ODR |= 0b1000000; break;
		case 1: GPIOA->ODR |= 0b1111001; break;
		case 2: GPIOA->ODR |= 0b0100100; break;
		case 3: GPIOA->ODR |= 0b0110000; break;
		case 4: GPIOA->ODR |= 0b0011001; break;
		case 5: GPIOA->ODR |= 0b0010010; break;
		case 6: GPIOA->ODR |= 0b0000010; break;
		case 7: GPIOA->ODR |= 0b1111000; break;
		case 8: GPIOA->ODR |= 0b0000000; break;
		case 9: GPIOA->ODR |= 0b0010000; break;
		default: GPIOA->ODR |= 0b1111111; break;
	}
}

void delay_ms(uint16_t t) {
	volatile unsigned long l = 0;
	for(uint16_t i = 0; i < t; i++)
	{
		for(l = 0; l < 800; l++);
	}
}