关于stm32 的问题 其实就是程序的问题

就是说，你的函数声明写在了调用之后。这句话是说，你在51行调用了该函数，但是函数的定义却在159行。程序误把你的函数定义当做函数调用了，而把函数调用当做了函数声明。

解决方案：

1、在调用函数之前先声明；

2、将函数定义在调用之前。

void PWM_Init()

{

unsigned short CCR1_Val = 5000;

unsigned short CCR2_Val = 5000;

GPIO_InitTypeDef GPIO_InitStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);

GPIO_InitStructureGPIO_Pin = BSP_GPIOC_PWM1|BSP_GPIOC_PWM2; // PC6,PC7输出

GPIO_InitStructureGPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructureGPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOC, &GPIO_InitStructure);

/ -----------------------------------------------------------------------

TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:

TIM3CLK = 36 MHz, Prescaler = 0x0, TIM3 counter clock = 36 MHz

TIM3 ARR Register = 999 => TIM3 Frequency = TIM3 counter clock/(ARR + 1)

TIM3 Frequency = 36 KHz

TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR) 100 = 50%

TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR) 100 = 375%

TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR) 100 = 25%

TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR) 100 = 125%

----------------------------------------------------------------------- /

/ Time base configuration /

TIM_DeInit(TIM3);

TIM_TimeBaseStructureTIM_Period = 10000; // 200Hz

TIM_TimeBaseStructureTIM_Prescaler = 35; //36M/(35+1)=1MHz

TIM_TimeBaseStructureTIM_ClockDivision = 0;

TIM_TimeBaseStructureTIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/ PWM1 Mode configuration: Channel1 /

TIM_OCInitStructureTIM_OCMode = TIM_OCMode_PWM1;

TIM_OCInitStructureTIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructureTIM_Pulse = CCR1_Val; //50%占空比

TIM_OCInitStructureTIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC1Init(TIM3, &TIM_OCInitStructure);

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

/ PWM1 Mode configuration: Channel2 /

TIM_OCInitStructureTIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructureTIM_Pulse = CCR2_Val;

TIM_OC2Init(TIM3, &TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM3, ENABLE);

/ TIM3 enable counter /

TIM_Cmd(TIM3, ENABLE);

}

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