module1-2(hal).c

#include "stm32f4xx_hal.h"

void SysTick_Handler(void);
void MX_GPIO_Init(void);
void MX_SPI1_Init(void);
void Error_Handler(void);
void SystemClock_Config(void);

SPI_HandleTypeDef hspi1;
GPIO_InitTypeDef GPIO_InitStruct;

int main() {
    MX_GPIO_Init();
    MX_SPI1_Init();
    /* Configure the SysTick to generate an interrupt every millisecond */
    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq() / 1000);
    uint8_t switch_word;  // Word to be transmitted
    while (1) {
        switch_word = 0xAA;  // Set up word to be transmitted
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);  // Select Slave device (CS low)
        HAL_SPI_Transmit(&hspi1, &switch_word, 1, 1000);  // Send switch_word
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);  // Deselect Slave device (CS high)
        HAL_Delay(500);  // Delay 500 ms

        switch_word = 0x55;  // Set up word to be transmitted
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);  // Select Slave device (CS low)
        HAL_SPI_Transmit(&hspi1, &switch_word, 1, 1000);  // Send switch_word
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);  // Deselect Slave device (CS high)
        HAL_Delay(500);  // Delay 500 ms
    }
}

volatile uint32_t msTicks = 0;   /* Counts 1ms timeTicks */

void SysTick_Handler(void) {
  HAL_IncTick();   /* Increment HAL tick count */
  msTicks++;       /* Increment the msTicks variable */
}

void MX_GPIO_Init(void) {
    /* GPIO Ports Clock Enable */
    __HAL_RCC_GPIOB_CLK_ENABLE();

    /*Configure GPIO pins : PC13 */
    GPIO_InitStruct.Pin = GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    __HAL_RCC_GPIOA_CLK_ENABLE();  // Enable the clock for GPIOA

    GPIO_InitTypeDef GPIO_InitStruct = {0};
    GPIO_InitStruct.Pin = GPIO_PIN_5 | GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);  // Set CS high (idle state)
}

void MX_SPI1_Init(void) {
    __HAL_RCC_SPI1_CLK_ENABLE();  // Enable the SPI1 clock

    hspi1.Instance = SPI1;
    hspi1.Init.Mode = SPI_MODE_MASTER;
    hspi1.Init.Direction = SPI_DIRECTION_2LINES;
    hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
    hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
    hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
    hspi1.Init.NSS = SPI_NSS_SOFT;
    hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;  // Adjust as needed
    hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
    hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
    hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
    hspi1.Init.CRCPolynomial = 7;

    if (HAL_SPI_Init(&hspi1) != HAL_OK) {
        // Initialization Error
        Error_Handler();
    }
}

void Error_Handler(void) {
    while (1) {
    }
}

/* Configure the system clock to 84 MHz */
void SystemClock_Config(void) {
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    /* Configure the main internal regulator output voltage */
    __HAL_RCC_PWR_CLK_ENABLE();
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);

    /* Initializes the RCC Oscillators according to the specified parameters */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
    RCC_OscInitStruct.PLL.PLLM = 16;
    RCC_OscInitStruct.PLL.PLLN = 336;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
    RCC_OscInitStruct.PLL.PLLQ = 7;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
        Error_Handler();
    }

    /* Initializes the CPU, AHB and APB busses clocks */
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK |
                                    RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
        Error_Handler();
    }
}