大佬們，我做了一個步進電機驅動程式，本來脈沖端子（F1的PB4引腳輸出PWM波）接好之后能轉了，我就再接方向端子（PC7輸出高低電平控制），結果就是沒反應，這里面的delay引數也改了幾個就是沒反應，一直轉。后來我就把setbits resetbits去掉發現電機能正常停止、轉動是可以的，不知道會是什么問題。為什么我加上改變電平的兩條陳述句連delay都不管用的呀...照理說就算setbit和resetbite不管用延時函式肯定也能起作用的啊。 接線是PUL+接5V PUL- 接PB4 DIR+接5V DIR- 接PC7
////下面是PWM 和引腳的初始化和設定部分
#include "PWM_OUT.h"
void TIM3_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOB, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE); //關掉ＪＴＡＧ，會用到PB4，不關驅動不了電機
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; / /PWM輸出腳
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //高低電平輸出腳
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void TIM3_PWM_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
u16 CCR1_Val = 250; //占空比50%
/* ----------------------------------------------------------------------
TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:
TIM3CLK = 72 MHz, Prescaler = 0x0, TIM3 counter clock = 72 MHz
TIM3 ARR Register = 999 => TIM3 Frequency = TIM3 counter clock/(ARR + 1)
TIM3 Frequency = 72 KHz.
TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50%
TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5%
TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25%
TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5%
----------------------------------------------------------------------- */
TIM_TimeBaseStructure.TIM_Prescaler = 17;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_Cmd(TIM3, ENABLE);
}
//////下面是main函式
int main(void)
{
LED_GPIO_Config();
TIM3_GPIO_Config();
TIM3_PWM_Init();
while(1)
{
TIM_Cmd(TIM3,DISABLE);
GPIO_ResetBits(GPIOC, GPIO_Pin_7);
Delay(0xFFFF);
TIM_Cmd(TIM3, ENABLE);
Delay(0xFFFFFFF);
TIM_Cmd(TIM3,DISABLE);
GPIO_SetBits(GPIOC, GPIO_Pin_7);
Delay(0xFFFF);
TIM_Cmd(TIM3,ENABLE);
Delay(0xFFFFFFF);
}
}
uj5u.com熱心網友回復：
PWM只用了通道1 ，其他的2 3 4 我就刪掉了轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/91456.html
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