用STM32驱动LTR303

以下是使用STM32驱动LTR303的示例代码。此代码使用STM32 HAL库来与LTR303进行通信。请注意，该代码仅供参考，您需要根据您的具体硬件和应用程序进行适当的修改和调整。

#include "stm32f4xx_hal.h"
#include "stdio.h"

#define LTR303_ADDR 0x29

I2C_HandleTypeDef hi2c;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);

int main(void)
{
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    MX_I2C1_Init();

    uint8_t writeBuf[2];
    uint8_t readBuf[2];
    uint16_t light;

    // 初始化LTR303
    writeBuf[0] = 0x01;
    writeBuf[1] = 0x10;
    HAL_I2C_Master_Transmit(&hi2c, LTR303_ADDR << 1, writeBuf, 2, 1000);

    writeBuf[0] = 0x03;
    writeBuf[1] = 0x02;
    HAL_I2C_Master_Transmit(&hi2c, LTR303_ADDR << 1, writeBuf, 2, 1000);

    // 读取LTR303数据
    writeBuf[0] = 0x88;
    HAL_I2C_Master_Transmit(&hi2c, LTR303_ADDR << 1, writeBuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c, LTR303_ADDR << 1, readBuf, 2, 1000);

    light = (readBuf[1] << 8) | readBuf[0];
    printf("Light: %u\n", light);

    while (1);
}

void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct;
    RCC_ClkInitTypeDef RCC_ClkInitStruct;

    __HAL_RCC_PWR_CLK_ENABLE();
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLM = 25;
    RCC_OscInitStruct.PLL.PLLN = 336;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    RCC_OscInitStruct.PLL.PLLQ = 7;
    HAL_RCC_OscConfig(&RCC_OscInitStruct);

    RCC_ClkInitStruct.ClockType = 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_DIV4;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
}

static void MX_I2C1_Init(void)
{
    hi2c.Instance = I2C1;
    hi2c.Init.ClockSpeed = 100000;
    hi2c.Init.DutyCycle = I2C_DUTYCYCLE_2;
    hi2c.Init.OwnAddress1 = 0;
    hi2c.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
    hi2c.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
    hi2c.Init.OwnAddress2 = 0;
    hi2c.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
    hi2c.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
    if (HAL_I2C_Init(&hi2c) != HAL_OK)
    {
        _Error_Handler(__FILE__, __LINE__);
    }
}

static void MX_GPIO_Init(void)
{
    __HAL_RCC_GPIOB_CLK_ENABLE();
    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}

此示例代码使用STM32F4系列微控制器，并在I2C1总线上连接LTR303传感器。在此示例中，我们使用STM32 HAL库中的函数进行I2C通信。代码初始化I2C总线和LTR303传感器，并从LTR303读取数据。注意，您需要根据您的硬件和应用程序进行适当的修改和调整。