Unistable shutter

2026-02-28 11:54:30 +03:00 · 2024-10-07 14:29:27 +03:00
parent 1633c668e9
commit 6b87f1e1f2
46 changed files with 11205 additions and 11567 deletions
--- a/F1:F103/shutter/UNISTABLE/hardware.c
+++ b/F1:F103/shutter/UNISTABLE/hardware.c
@@ -0,0 +1,113 @@
+/*
+ * This file is part of the shutter project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "adc.h"
+#include "flash.h"
+#include "hardware.h"
+
+TRUE_INLINE void iwdg_setup(){
+    uint32_t tmout = 16000000;
+    /* Enable the peripheral clock RTC */
+    /* (1) Enable the LSI (40kHz) */
+    /* (2) Wait while it is not ready */
+    RCC->CSR |= RCC_CSR_LSION; /* (1) */
+    while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
+    /* Configure IWDG */
+    /* (1) Activate IWDG (not needed if done in option bytes) */
+    /* (2) Enable write access to IWDG registers */
+    /* (3) Set prescaler by 64 (1.6ms for each tick) */
+    /* (4) Set reload value to have a rollover each 2s */
+    /* (5) Check if flags are reset */
+    /* (6) Refresh counter */
+    IWDG->KR = IWDG_START; /* (1) */
+    IWDG->KR = IWDG_WRITE_ACCESS; /* (2) */
+    IWDG->PR = IWDG_PR_PR_1; /* (3) */
+    IWDG->RLR = 1250; /* (4) */
+    tmout = 16000000;
+    while(IWDG->SR){if(--tmout == 0) break;} /* (5) */
+    IWDG->KR = IWDG_REFRESH; /* (6) */
+}
+
+/*
+Pinout:
+PB10 (pullup in) - CCD or button input (depends on settings)
+PB11 (alternate: TIM2_CH4) - PWM output for shutter feeding
+PB12 (pullup in) - hall (or reed switch) sensor input (opened/closed shutter detector)
+PB13 (PP out) - USB pullup (active low)
+
+PA3 (ADC in) - shutter voltage (approx 1/12 U)
+PA9 (reserved) - USART1 Tx
+PA10 (reserved) - USART1 Rx
+PA11,12 - USB
+PA13,14 - SWD
+*/
+
+TRUE_INLINE void gpio_setup(){
+    // Enable clocks to the GPIO subsystems, turn on AFIO clocking to disable SWD/JTAG
+    RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_AFIOEN;
+    __DSB();
+    // turn off SWJ/JTAG
+//    AFIO->MAPR = AFIO_MAPR_SWJ_CFG_DISABLE;
+    // AFIO->MAPR = AFIO_MAPR_SWJ_CFG_JTAGDISABLE; // for PA15
+    GPIOA->CRL = CRL(3, CNF_ANALOG | MODE_INPUT);
+    GPIOB->CRH = CRH(10, CNF_PUDINPUT | MODE_INPUT) | CRH(12, CNF_PUDINPUT | MODE_INPUT) |
+                 CRH(13, CNF_PPOUTPUT | MODE_NORMAL);
+    // if ccdactive==0 - shutter is closed when no output signals
+    //GPIOB->ODR = ((the_conf.hallactive) ? 0: 1) | ((the_conf.ccdactive) ? 0 : 1<<11);
+    GPIOB->ODR = (1<<10) | (1<<11); // PB10 & PB12 pullup
+}
+
+// TIM2_CH4 (36MHz) as PWM @ 65kHz
+TRUE_INLINE void pwm_setup(){
+    // remap TIM2_CH4 to PB11
+    AFIO->MAPR = (AFIO->MAPR & ~AFIO_MAPR_TIM2_REMAP) |
+                 AFIO_MAPR_TIM2_REMAP_PARTIALREMAP2;
+    GPIOB->CRH |= CRH(11, CNF_AFPP | MODE_NORMAL);
+    RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
+    // 36 MHz / 100 / 65kHz = 5 ==> 7.2MHz with PWMfreq = 72kHz
+    TIM2->PSC = 4;
+    TIM2->ARR = 99;
+    TIM2->CCR4 = 0; // turned off at start
+    // mode1: active->inactive; CCR4 preload enable
+    TIM2->CCMR2 = TIM_CCMR2_OC4M_2 | TIM_CCMR2_OC4M_1 | TIM_CCMR2_OC4PE;
+    // enable PWM output
+    TIM2->CCER = TIM_CCER_CC4E;
+    // turn on and generate update event to refresh preloaded buffers
+    TIM2->CR1 = TIM_CR1_CEN;
+    TIM2->EGR = TIM_EGR_UG;
+}
+
+// set PWM to 0..100%, return 0 if `percent`>100
+int set_pwm(uint32_t percent){
+    if(percent > 100) return 0;
+    TIM2->CCR4 = percent;
+    return 1;
+}
+
+void hw_setup(){
+    iwdg_setup();
+    gpio_setup();
+    adc_setup();
+    pwm_setup();
+}
+
+uint32_t getShutterVoltage(){
+    uint32_t val = getADCvoltage(CHSHTR);
+    val *= the_conf.shtrVmul;
+    return val / the_conf.shtrVdiv;
+}