STM32 Microcontrollers

// Blink LED on PA5 using HAL
#include "stm32f4xx_hal.h"

int main(void) {
    HAL_Init();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    GPIO_InitStruct.Pin = GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    
    while(1) {
        HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
        HAL_Delay(500);
    }
}

// ADC with DMA Example
void ADC_DMA_Init() {
    // Configure ADC
    hadc1.Instance = ADC1;
    hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
    hadc1.Init.Resolution = ADC_RESOLUTION_12B;
    HAL_ADC_Init(&hadc1);
    
    // Configure DMA
    hdma_adc1.Instance = DMA2_Stream0;
    hdma_adc1.Init.Channel = DMA_CHANNEL_0;
    hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
    HAL_DMA_Init(&hdma_adc1);
    
    // Link DMA to ADC
    __HAL_LINKDMA(&hadc1, DMA_Handle, hdma_adc1);
    
    // Start ADC with DMA
    HAL_ADC_Start_DMA(&hadc1, (uint32_t*)adc_buffer, ADC_BUF_LEN);
}

// PWM Output on TIM1 Channel 1
void PWM_Init() {
    TIM_HandleTypeDef htim1;
    TIM_OC_InitTypeDef sConfigOC = {0};
    
    htim1.Instance = TIM1;
    htim1.Init.Prescaler = 84-1; // 1MHz clock
    htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim1.Init.Period = 1000-1;  // 1kHz PWM
    HAL_TIM_PWM_Init(&htim1);
    
    sConfigOC.OCMode = TIM_OCMODE_PWM1;
    sConfigOC.Pulse = 500;       // 50% duty
    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1);
    
    HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);
}

// Simple FreeRTOS Example
void Task1(void *pvParameters) {
    while(1) {
        HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
        vTaskDelay(500 / portTICK_PERIOD_MS);
    }
}

void Task2(void *pvParameters) {
    while(1) {
        // Process sensor data
        vTaskDelay(100 / portTICK_PERIOD_MS);
    }
}

int main(void) {
    HAL_Init();
    SystemClock_Config();
    
    xTaskCreate(Task1, "LED_Task", 128, NULL, 1, NULL);
    xTaskCreate(Task2, "Sensor_Task", 256, NULL, 2, NULL);
    
    vTaskStartScheduler();
    
    while(1);
}