mirror of
https://github.com/EranMorkon/AMTS.git
synced 2023-12-28 16:48:38 +00:00
43 lines
748 B
C
43 lines
748 B
C
#include "ne555.h"
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volatile uint32_t *NE555STick, NE555STickCur;
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uint8_t old_state;
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void init_ne555(volatile uint32_t *SysTickCnt)
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
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GPIO_InitTypeDef gpio;
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GPIO_StructInit(&gpio);
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gpio.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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gpio.GPIO_Pin = GPIO_Pin_0;
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GPIO_Init(GPIOB, &gpio);
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NE555STick = SysTickCnt;
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return;
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}
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void run_ne555(float *freq)
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{
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uint8_t state;
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*freq = 0.0f;
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NE555STickCur = *NE555STick;
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while((*NE555STick - NE555STickCur) <= 1000)
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{
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state = GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_0);
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if (state != old_state)
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{
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(*freq)++;
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old_state = state;
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}
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}
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*freq /= 2;
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return;
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}
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void deinit_ne555(void)
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{
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return;
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}
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