AVS úkol 3/1

/* Includes ------------------------------------------------------------------*/
#include <stdio.h>
#include "stm32_eval.h"
#include "serial_driver.h"
#include "string.h"
#include "myUSART.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
volatile int16_t lastPos;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

void initEncoder() {
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

    GPIO_InitTypeDef gpioInitStruct;
    GPIO_StructInit(&gpioInitStruct);
    gpioInitStruct.GPIO_Mode = GPIO_Mode_AF;
    gpioInitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
    gpioInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    gpioInitStruct.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13;
    GPIO_Init(GPIOD, &gpioInitStruct);

    GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_TIM4);

    TIM_EncoderInterfaceConfig(TIM4, TIM_EncoderMode_TI1, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);

    TIM_Cmd(TIM4, ENABLE);
}

void initResetButton() {
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
    GPIO_InitTypeDef gpioInitStruct;
    GPIO_StructInit(&gpioInitStruct);
    gpioInitStruct.GPIO_Mode = GPIO_Mode_IN;
    gpioInitStruct.GPIO_PuPd = GPIO_PuPd_UP;
    gpioInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    gpioInitStruct.GPIO_Pin = GPIO_Pin_14;
    GPIO_Init(GPIOC, &gpioInitStruct);
}

void SysTick_Handler() {
        char szBuf[10];
        int16_t newPos;

        if (GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_14) == 0) {
            TIM_SetCounter(TIM4, 0);
        }

        newPos = (int16_t)TIM_GetCounter(TIM4);
        if (newPos != lastPos) {
            lastPos = newPos;
            sprintf(szBuf, "%d\r\n", newPos);
            putString(szBuf);
        }
}

/**
 * Main program.
 * @return Nothing.
 */
int main(void) {
    initUSART();
    initEncoder();
    initResetButton();
    SysTick_Config(SystemCoreClock / 100);

    putString("Init complete.\r\n");
    for (;;);
}