mirror of
https://github.com/eddyem/stm32samples.git
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93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/*
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* This file is part of the shutter project.
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* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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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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*
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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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*
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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 <http://www.gnu.org/licenses/>.
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*/
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#include "adc.h"
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#include "flash.h"
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#include "hardware.h"
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static inline void iwdg_setup(){
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uint32_t tmout = 16000000;
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/* Enable the peripheral clock RTC */
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/* (1) Enable the LSI (40kHz) */
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/* (2) Wait while it is not ready */
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RCC->CSR |= RCC_CSR_LSION; /* (1) */
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while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
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/* Configure IWDG */
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/* (1) Activate IWDG (not needed if done in option bytes) */
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/* (2) Enable write access to IWDG registers */
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/* (3) Set prescaler by 64 (1.6ms for each tick) */
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/* (4) Set reload value to have a rollover each 2s */
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/* (5) Check if flags are reset */
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/* (6) Refresh counter */
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IWDG->KR = IWDG_START; /* (1) */
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IWDG->KR = IWDG_WRITE_ACCESS; /* (2) */
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IWDG->PR = IWDG_PR_PR_1; /* (3) */
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IWDG->RLR = 1250; /* (4) */
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tmout = 16000000;
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while(IWDG->SR){if(--tmout == 0) break;} /* (5) */
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IWDG->KR = IWDG_REFRESH; /* (6) */
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}
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/*
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Pinout:
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PB0 (pullup in) - hall (or reed switch) sensor input (active low) - opened shutter detector
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PB11 (pullup in) - CCD or button input: open at low signal, close at high
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PA3 (ADC in) - shutter voltage (approx 1/12 U)
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PA5 (PP out) - TLE5205 IN2
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PA6 (PP out) - TLE5205 IN1
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PA7 (pullup in) - TLE5205 FB
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PA10 (PP out) - USB pullup (active low)
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PA11,12 - USB
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PA13,14 - SWD
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*/
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static inline void gpio_setup(){
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// Enable clocks to the GPIO subsystems, turn on AFIO clocking to disable SWD/JTAG
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RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_AFIOEN;
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__DSB();
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// turn off SWJ/JTAG
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// AFIO->MAPR = AFIO_MAPR_SWJ_CFG_DISABLE;
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// AFIO->MAPR = AFIO_MAPR_SWJ_CFG_JTAGDISABLE; // for PA15
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// TLE5205 in OFF state
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// ADC (PA3), OD out (PA5,6), PU in (PA7)
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GPIOA->ODR = 1 << 7;
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SHTROFF();
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GPIOA->CRL = CRL(3, CNF_ANALOG | MODE_INPUT) | CRL(5, CNF_PPOUTPUT|MODE_SLOW) | CRL(6, CNF_PPOUTPUT|MODE_SLOW) |
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CRL(7, CNF_PUDINPUT | MODE_INPUT);
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// USB pullup (PA10) - pushpull output
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GPIOA->CRH = CRH(8, CNF_PPOUTPUT | MODE_SLOW) | CRH(10, CNF_PPOUTPUT | MODE_SLOW);
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// hall/ccd: pulled up or down depending on settings
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// if ccdactive==0 - shutter is closed when no output signals
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GPIOB->ODR = ((the_conf.hallactive) ? 0: 1) | ((the_conf.ccdactive) ? 0 : 1<<11);
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GPIOB->CRL = CRL(0, CNF_PUDINPUT | MODE_INPUT);
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GPIOB->CRH = CRH(11, CNF_PUDINPUT | MODE_INPUT);
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}
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void hw_setup(){
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iwdg_setup();
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gpio_setup();
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adc_setup();
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}
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uint32_t getShutterVoltage(){
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uint32_t val = getADCvoltage(CHSHTR);
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val *= the_conf.shtrVmul;
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return val / the_conf.shtrVdiv;
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}
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