206 lines
5.9 KiB
C
206 lines
5.9 KiB
C
/* ***************************************************************************************
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* Project: task1 - C:GPIO
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* File: task1.c
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*
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* Language: C
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*
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* Hardware: STefi Light v1.1
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* Processor: STM32G431KBT6U
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*
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* Author: Manuel Lederhofer
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* Datum: 10.09.2021
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*
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* Version: 2.1
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* History:
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* 10.09.2021 ML create project
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* 09.03.2022 ML port from STM32F042K6T6 to STM32G431KBT6U
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* 18.02.2025 TK changed projectname to "C: GPIO)
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*
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* Status: under development
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*
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* Description:
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* Blinks the red LED of STefi Light, currently.
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* This file contains the main routine and the initialization.
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*
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* Notes:
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* - MCU speed at startup is 16 MHz
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*
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* Todo:
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* - Change the example code to match the description and requirements
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* of the requested application in the lab exercise guide.
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*
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************************************************************************************** */
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/* ------------------------------------ INCLUDES -------------------------------------- */
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#include "stm32g431xx.h"
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#include "STefi-Light.h"
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/* ------------------------------------ DEFINES --------------------------------------- */
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#define LOOPS_PER_MS 1244 // NOP-loops for delay()
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#define WAITTIME 500
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#define FIRST_LED 0
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#define LAST_LED 3
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#define UP 1
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#define DOWN -1
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/* ------------------------------------ TYPE DEFINITIONS ------------------------------ */
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/* ------------------------------------ GLOBAL VARIABLES ------------------------------ */
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int state = 0;
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/* ------------------------------------ PRIVATE VARIABLES ----------------------------- */
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/* ------------------------------------ PROTOTYPES ------------------------------------ */
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static void GPIO_init(void);
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static void delay(const uint16_t ms);
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static void blink(const unint numLED);
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/* ------------------------------------ M A I N --------------------------------------- */
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int main(void)
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{
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/* --- initialization --- */
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__disable_irq(); // disable interrupts globally
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GPIO_init();
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__enable_irq(); // enable interrupts globally
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/* --- one time tasks --- */
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/* --- infinite processing loop --- */
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while (1)
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{
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/* ... add your code to implement the lab assignment ... */
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int direction;
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while(1){
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if(i == FIRST_LED){
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direction = UP;
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}
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else if(i == LAST_LED){
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direction = DOWN;
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}
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blink(i); //One full LED blink cylce
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if(direction == UP){
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i++;
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}
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else if(direction == DOWN){
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i--;
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}
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}
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switch (state) {
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case 0:
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GPIOA->ODR &= ~(1 << 0); // LED0 on
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GPIOA->ODR &= ~(1 << 1);
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GPIOA->ODR &= ~(1 << 2);
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GPIOA->ODR &= ~(1 << 3);
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state++;
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break;
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case 1:
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delay(WAITTIME); // wait
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state++;
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break;
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case 2:
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GPIOA->ODR |= (1 << 0); // LED0 off
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GPIOA->ODR |= (1 << 1);
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GPIOA->ODR |= (1 << 2);
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GPIOA->ODR |= (1 << 3);
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delay(WAITTIME); // wait
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state = 0;
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break;
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default:
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break;
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}
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}
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return 1;
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}
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/* ------------------------------------ GLOBAL FUNCTIONS ------------------------------ */
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/* ------------------------------------ PRIVATE FUNCTIONS ----------------------------- */
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/* ------------------------------------------------------------------------------------ *\
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* method: static void GPIO_init(void)
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*
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* Initializes GPIOs on STefi Light for pins with peripherals attached.
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*
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* requires: - nothing -
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* parameters: - none -
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* returns: - nothing -
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\* ------------------------------------------------------------------------------------ */
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static void GPIO_init(void)
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{
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/* enable port clocks */
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RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN; // LEDs: A
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int i = FIRST_LED;
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/* --- LEDs --- */
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GPIOA->ODR |= MASK_LED_ALL;
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GPIOA->MODER &= ~(3 << 0);
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GPIOA->MODER &= ~(3 << 2);
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GPIOA->MODER &= ~(3 << 4);
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GPIOA->MODER &= ~(3 << 6);
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GPIOA->MODER |= (1 << 0); // set LED pin to output
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GPIOA->MODER |= (1 << 2);
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GPIOA->MODER |= (1 << 4);
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GPIOA->MODER |= (1 << 6);
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}
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/* ------------------------------------------------------------------------------------ *\
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* method: static void delay(const uint16_t ms)
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*
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* Realizes a millisecond delay by very bad busy-wait.
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*
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* requires: - nothing -
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* parameters: ms - delay time in milliseconds
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* returns: - nothing -
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\* ------------------------------------------------------------------------------------ */
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static void delay(const uint16_t ms)
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{
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for (uint16_t i = 0; i < ms; ++i)
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{
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for (uint16_t j = 0; j < LOOPS_PER_MS; ++j)
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{
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__asm("NOP");
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}
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}
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}
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static void blink(const uint numLED)
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{
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switch (state) {
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case 0:
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GPIOA->ODR &= ~(1 << numLED); // LEDX on
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state++;
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break;
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case 1:
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delay(WAITTIME); // wait
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state++;
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break;
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case 2:
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GPIOA->ODR |= (1 << numLED); // LEDX off
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delay(WAITTIME); // wait
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state = default;
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break;
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default:
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break;
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}
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/* ************************************ E O F ***************************************** */
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