mirror of
https://github.com/eddyem/stm32samples.git
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114 lines
3.9 KiB
C
114 lines
3.9 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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TRUE_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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PB10 (pullup in) - CCD or button input (depends on settings)
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PB11 (alternate: TIM2_CH4) - PWM output for shutter feeding
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PB12 (pullup in) - hall (or reed switch) sensor input (opened/closed shutter detector)
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PB13 (PP out) - USB pullup (active low)
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PA3 (ADC in) - shutter voltage (approx 1/12 U)
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PA9 (reserved) - USART1 Tx
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PA10 (reserved) - USART1 Rx
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PA11,12 - USB
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PA13,14 - SWD
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*/
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TRUE_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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GPIOA->CRL = CRL(3, CNF_ANALOG | MODE_INPUT);
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GPIOB->CRH = CRH(10, CNF_PUDINPUT | MODE_INPUT) | CRH(12, CNF_PUDINPUT | MODE_INPUT) |
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CRH(13, CNF_PPOUTPUT | MODE_NORMAL);
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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->ODR = (1<<10) | (1<<11); // PB10 & PB12 pullup
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}
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// TIM2_CH4 (36MHz) as PWM @ 65kHz
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TRUE_INLINE void pwm_setup(){
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// remap TIM2_CH4 to PB11
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AFIO->MAPR = (AFIO->MAPR & ~AFIO_MAPR_TIM2_REMAP) |
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AFIO_MAPR_TIM2_REMAP_PARTIALREMAP2;
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GPIOB->CRH |= CRH(11, CNF_AFPP | MODE_NORMAL);
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RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
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// 36 MHz / 100 / 65kHz = 5 ==> 7.2MHz with PWMfreq = 72kHz
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TIM2->PSC = 4;
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TIM2->ARR = 99;
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TIM2->CCR4 = 0; // turned off at start
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// mode1: active->inactive; CCR4 preload enable
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TIM2->CCMR2 = TIM_CCMR2_OC4M_2 | TIM_CCMR2_OC4M_1 | TIM_CCMR2_OC4PE;
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// enable PWM output
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TIM2->CCER = TIM_CCER_CC4E;
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// turn on and generate update event to refresh preloaded buffers
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TIM2->CR1 = TIM_CR1_CEN;
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TIM2->EGR = TIM_EGR_UG;
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}
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// set PWM to 0..100%, return 0 if `percent`>100
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int set_pwm(uint32_t percent){
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if(percent > 100) return 0;
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TIM2->CCR4 = percent;
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return 1;
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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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pwm_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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