基于Stm32写一个用TCS3200颜色传感器白平衡的代码

你好，以下是基于Stm32写一个用TCS3200颜色传感器白平衡的代码的参考：

#include "stm32f10x.h"

#define S0_PIN  GPIO_Pin_3
#define S0_PORT GPIOB
#define S1_PIN  GPIO_Pin_4
#define S1_PORT GPIOB
#define S2_PIN  GPIO_Pin_5
#define S2_PORT GPIOB
#define S3_PIN  GPIO_Pin_6
#define S3_PORT GPIOB
#define OUT_PIN GPIO_Pin_7
#define OUT_PORT GPIOB

void delay_us(uint32_t nus)
{
    uint32_t ticks = nus * (SystemCoreClock / 1000000);
    while(ticks--);
}

uint16_t read_color(uint8_t color)
{
    GPIO_WriteBit(S2_PORT, S2_PIN, (color >> 1) & 0x01);
    GPIO_WriteBit(S3_PORT, S3_PIN, color & 0x01);
    delay_us(10);
    return TIM_GetCapture1(TIM3);
}

int main(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_StructInit(&GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Pin = S0_PIN | S1_PIN | S2_PIN | S3_PIN;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    TIM_ICInitTypeDef TIM_ICInitStructure;
    TIM_ICStructInit(&TIM_ICInitStructure);
    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    TIM_ICInitStructure.TIM_ICFilter = 0x0F;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM_ICInit(TIM3, &TIM_ICInitStructure);

    GPIO_ResetBits(S0_PORT, S0_PIN | S1_PIN);
    GPIO_SetBits(S2_PORT, S2_PIN | S3_PIN);

    while(1)
    {
        uint16_t red = read_color(0x00);
        uint16_t green = read_color(0x01);
        uint16_t blue = read_color(0x02);

        // Calculate white balance coefficients
        uint16_t red_coef = (blue << 8) / red;
        uint16_t green_coef = (blue << 8) / green;
        uint16_t blue_coef = 0xFF;

        // Set white balance coefficients
        TIM_SetCompare1(TIM3, red_coef);
        delay_us(10);
        TIM_SetCompare1(TIM3, green_coef);
        delay_us(10);
        TIM_SetCompare1(TIM3, blue