/* ***************************************************************************************
#   Project:    task3 - C: Timer & Interrupts
#   File:       task3.s
#
#   Language:   C
#
#   Hardware:   STefi Light v1.1
#   Processor:  STM32G431KBT6U
#
#   Author:     Manuel Lederhofer
#   Datum:      31.10.2014
#
#   Version:    6.1
#   History:
#       31.10.2014  ML  create file
#       27.09.2018  ML  edit comments, extend vector table
#       18.12.2018  ML  port from MKL05Z32VLC4 to STM32L476RG
#       27.02.2019  ML  move section of exception handlers to bottom of file,
#                           change ASM pseudo commands from .space to .org
#       25.09.2019  ML  minor changes for a better code and comment understanding
#       04.09.2020  HL  port from STM32L476RG to STM32F411xE
#       21.09.2020  ML  tidy up, comments and formatting
#       29.09.2021  ML  port from STM32F411xE to STM32F042K6T6
#       09.03.2022  ML  port from STM32F042K6T6 to STM32G431KBT6U
#       17.02.2025  TK  move ASM:Interrupts to task2, replace with C:Timer & Interrupts
#       24.06.2025  TK  remove "... put your code here ...", remove Systick

#
#   Status:     working
#
#   Description:
#       See the description and requirements of the requested application
#       in the lab exercise guide.
#
#   Notes:
#       - MCU speed at startup is 16 MHz
#
#   ToDo:
#       - Change the example code to match the description and requirements
#          of the requested application in the lab exercise guide.
#
#
#   Measurements:
#       Timers used         :
#       Current with WFI    :
#       Current without WFI :
#
 ************************************************************************************** */

/* ------------------------------------ INCLUDES -------------------------------------- */
#include "stm32g431xx.h"
#include "STefi-Light.h"


/* ------------------------------------ DEFINES --------------------------------------- */
/* ------------------------------------ TYPE DEFINITIONS ------------------------------ */
/* ------------------------------------ GLOBAL VARIABLES ------------------------------ */
/* ------------------------------------ PRIVATE VARIABLES ----------------------------- */


/* ------------------------------------ PROTOTYPES ------------------------------------ */
static void GPIO_init(void);


/* ------------------------------------ M A I N --------------------------------------- */
int main(void)
{
    /* --- initialization --- */
    __disable_irq();        // disable interrupts globally

    GPIO_init();

    __enable_irq();         // enable interrupts globally


    /* --- one time tasks --- */


    /* --- infinite processing loop --- */
    while (1)
    {
        GPIOA->ODR ^= (1 << 0);    // toggle LED0

        __WFI();
    }

    return 1;
}


/* ------------------------------------ GLOBAL FUNCTIONS ------------------------------ */


/* ------------------------------------ PRIVATE FUNCTIONS ----------------------------- */

/* ------------------------------------------------------------------------------------ *\
 * method:  static void GPIO_init(void)
 *
 * Initializes GPIOs on STefi Light for pins with peripherals attached.
 *
 * requires:    - nothing -
 * parameters:  - none -
 * returns:     - nothing -
\* ------------------------------------------------------------------------------------ */
static void GPIO_init(void)
{
    /* enable port clocks */
    RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN;    // LEDs: A


    /* --- LEDs --- */
    GPIOA->ODR |= (1 << 0);
    GPIOA->MODER &= ~(3 << 0);
    GPIOA->MODER |= (1 << 0);               // set LED pin to output


    /* --- buttons --- */

    /* init */




    /* interrupt config for Buttons */


}


/* ------------------------------------------------------------------------------------ *\
 * method:  static void SysTick_init(void)
 *
 * At system startup SysTick runs with 1 MHz down to 0.
 *
 * Register names differ in datasheets.
 *  ST / CMSIS:         ARM:
 *  - SysTick->CALIB    - STK_CALIB
 *  - SysTick->CTRL     - STK_CSR
 *  - SysTick->LOAD     - STK_RVR
 *  - SysTick->VAL      - STK_CVR
 *
 * requires:    - nothing -
 * parameters:  - none -
 * returns:     - nothing -
 \* ------------------------------------------------------------------------------------ */



/* ************************************ E O F ***************************************** */