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67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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Manufacturing tests for the new cortex minimal system
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Copyright (C) 2018 Andreas Mieke
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#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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// Enable GPIOb clock
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
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// Create gpio struct and fill it with default values
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GPIO_InitTypeDef gpio;
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GPIO_StructInit(&gpio);
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// Set PB0 to input floating
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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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// Run for one second
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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 the state changes low -> high or high -> low increment freq and save state
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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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// Divide freq by two to get the frequency
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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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