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This commit is contained in:
Andreas Mieke 2018-03-18 23:43:59 +01:00
parent 4093cd295f
commit dc99dcf6e8
41 changed files with 1775 additions and 19 deletions
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42
Mieke/SW/MT/ne555.c Normal file
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#include "ne555.h"
volatile uint32_t *NE555STick, NE555STickCur;
uint8_t old_state;
void init_ne555(volatile uint32_t *SysTickCnt)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitTypeDef gpio;
GPIO_StructInit(&gpio);
gpio.GPIO_Mode = GPIO_Mode_IN_FLOATING;
gpio.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOB, &gpio);
NE555STick = SysTickCnt;
return;
}
void run_ne555(float *freq)
{
uint8_t state;
*freq = 0.0f;
NE555STickCur = *NE555STick;
while((*NE555STick - NE555STickCur) <= 1000)
{
state = GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_0);
if (state != old_state)
{
(*freq)++;
old_state = state;
}
}
*freq /= 2;
return;
}
void deinit_ne555(void)
{
return;
}