#include <stm32f10x.h>
#define _BV(n) (1 << (n))
uint8_t n = 0; uint8_t seg8[] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90};
void delay(void) { uint32_t i; for (i = 0; i < 20000; i++); }
void SerIn(uint8_t data) { uint8_t i; for (i = 0; i < 8; i++) { GPIOC->BRR = _BV(15); if (data & 0x80) GPIOA->BSRR = _BV(0); else GPIOA->BRR = _BV(0); GPIOC->BSRR = _BV(15); data <<= 1; } }
void ParOut(void) { GPIOC->BRR = _BV(14); GPIOC->BSRR = _BV(14); }
void seg_scan(uint8_t i) { while (i--) { SerIn(seg8[n % 100 / 10]); SerIn(_BV(7)); ParOut(); delay(); SerIn(seg8[n % 10]); SerIn(_BV(6)); ParOut(); delay(); SerIn(seg8[TIM1->CNT % 10000 / 1000]); SerIn(_BV(1)); ParOut(); delay(); SerIn(seg8[TIM1->CNT % 1000 / 100]); SerIn(_BV(0)); ParOut(); delay(); } }
int main(void) { RCC->APB2ENR = _BV(2) | _BV(4) | _BV(11); // 開啟PA、PC和TIM1時鐘, 不需要開啟AFIO的時鐘 GPIOA->CRH = 0x0000008b; // PA9設為輸入, PA8設為復用50MHz推輓輸出 GPIOA->CRL = 0x00000003; // PA0設為50MHz推輓輸出 GPIOC->CRH = 0x33000000; // PC14~15設為50MHz推輓輸出 GPIOA->BSRR = _BV(9); // PA9輸入帶上拉, 即懸空時輸入高電平
TIM1->ARR = 5099; TIM1->PSC = 65535; TIM1->CCR1 = 2000; // 輸出比較值 TIM1->CCMR1 = 0xf160; // CC2S=01(IC2=>TI2, 通道2設為輸入), IC2F=1111(硬件消抖), OC1M=110(通道1選PWM模式1) TIM1->BDTR = 0x8000; // MOE=1(允許通道輸出) TIM1->CCER = 0x21; // CC2P=1(TI2下降沿觸發), CC1E=1(開通道1輸出) TIM1->SMCR = 0x66; // TS=110(設置TRGI為TI2(PA9)), SMS=110(trigger mode) // 開中斷 NVIC->ISER[0] = _BV(25) | _BV(26); TIM1->DIER = 0x61; // TIE=1, COMIE=1, UIE=1 // 刷新寄存器 TIM1->CR1 = 0x0c; // OPM=1, URS=1 TIM1->EGR = 0x01; // UG=1 TIM1->CR1 &= ~_BV(2); // URS=0 //TIM1->EGR = 0x20; // COMG=1, 軟件觸發COM事件, 數碼管最高位變為5 while (1) { seg_scan(1); } }
void TIM1_UP_IRQHandler(void) { TIM1->SR &= ~_BV(0); // UIF=0 n = 0; }
void TIM1_TRG_COM_IRQHandler(void) { if (TIM1->SR & _BV(5)) { TIM1->SR &= ~_BV(5); // COMIF=0 n = 50 + n % 10; } else if (TIM1->SR & _BV(6)) { TIM1->SR &= ~_BV(6); // TIF=0 n = n - n % 10 + 6; } }
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