?? pwm.c
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/*----------------------------------------------------------------------------
QQ: 958664258
21IC用戶名:banhushui
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旺旺:半壺水電子
編譯器版本:MDK4.12
*---------------------------------------------------------------------------*/
#include <stm32f10x_lib.h> // STM32F10x Library Definitions
#include "STM32_Init.h" // STM32 Initialization
unsigned short Ccr = 0; // Capture , Compare value
int Dir = 1; // in- decrease CCR
/*------------------------------------------------------------------------------
Timer4 Update Interrupt Handler
*------------------------------------------------------------------------------*/
void TIM4_IRQHandler(void)
{
if (TIM4->SR & (1 << 0))
{
// UIF set?
// lower limit reached ? move up
//判斷占空比到最小
if (Ccr == 0)
Dir = 1;
// upper limit reached ? move down
//判斷占空比到最大
if (Ccr == 100)
Dir = -1;
Ccr = Ccr + Dir;
TIM4->CCR3 = Ccr; // change ccr
TIM4->CCR4 = 100 - Ccr; // change ccr
TIM4->SR &= ~(1 << 0); // clear UIF flag
}
} // end TIM4_IRQHandler
/*----------------------------------------------------------------------------
MAIN function
*----------------------------------------------------------------------------*/
int main(void)
{
stm32_Init(); // STM32 setup
while (1)
{
// Loop forever
;} // end while
} // end main
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