基于STM32F103使用8路灰度的源程序库函数版本

以下是基于STM32F103使用8路灰度的源程序库函数版本示例代码：

#include "stm32f10x.h"

#define LEDS_PORT   GPIOB
#define LEDS_PIN    GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10

void TIM2_PWM_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    //开启GPIOB和TIM2时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    //PB0、PB1、PB5、PB6、PB7、PB8、PB9、PB10设置为复用推挽输出模式
    GPIO_InitStructure.GPIO_Pin = LEDS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LEDS_PORT, &GPIO_InitStructure);

    //设置TIM2的时基参数
    TIM_TimeBaseStructure.TIM_Period = 1000 - 1; //PWM周期为1ms
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1; //时钟预分频为72
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    //设置TIM2通道1~8的PWM参数
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC1Init(TIM2, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC2Init(TIM2, &TIM_OCInitStructure);
    TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC3Init(TIM2, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC4Init(TIM2, &TIM_OCInitStructure);
    TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC1Init(TIM2, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC2Init(TIM2, &TIM_OCInitStructure);
    TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC3Init(TIM2, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC4Init(TIM2, &TIM_OCInitStructure);
    TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);

    //使能TIM2
    TIM_Cmd(TIM2, ENABLE);
}

int main(void)
{
    uint16_t duty[8] = {0, 100, 200, 300, 400, 500, 600, 700};
    uint8_t i;

    TIM2_PWM_Init();

    while(1)
    {
        //循环调整PWM占空比，实现灰度控制
        for(i = 0; i < 8; i++)
        {
            TIM_SetCompare1(TIM2, duty[(0+i)%8]);
            TIM_SetCompare2(TIM2, duty[(1+i)%8]);
            TIM_SetCompare3(TIM2, duty[(2+i)%8]);
            TIM_SetCompare4(TIM2, duty[(3+i)%8]);
            TIM_SetCompare1(TIM2, duty[(4+i)%8]);
            TIM_SetCompare2(TIM2, duty[(5+i)%8]);
            TIM_SetCompare3(TIM2, duty[(6+i)%8]);
            TIM_SetCompare4(TIM2, duty[(7+i)%8]);
            Delay(10);
        }
    }
}

//简单的延时函数
void Delay(uint32_t count)
{
    for(uint32_t i = 0; i < count; i++);
}

该程序和前一个程序的主要区别在于使用了STM32F10x标准库函数，例如`GPIO_Init`、`TIM_TimeBaseInit`、`TIM_OCInit`等函数。这些函数可以更加方便地进行GPIO和TIM的初始化和配置，使程序更加简洁易懂。

需要注意的是，为了使用标准库函数，需要在工程的文件夹中添加`stm32f10x.h`和`stm32f10x_tim.h`头文件，并在工程属性中的C/C++编译器选项中添加`-DUSE_STDPERIPH_DRIVER`宏定义。