Unistable shutter

F1:F103/shutter/UNISTABLE/main.c

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+/*
+ * This file is part of the shutter project.
+ * Copyright 2022 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 "hardware.h"
+#include "proto.h"
+#include "shutter.h"
+#include "usb.h"
+
+#define MAXSTRLEN    RBINSZ
+
+// eash ERRPERIOD ms show error message if shutter in error state
+#define ERRPERIOD   9999
+
+volatile uint32_t Tms = 0;
+
+void sys_tick_handler(void){
+    ++Tms;
+}
+
+int main(void){
+    char inbuff[MAXSTRLEN+1];
+    StartHSE();
+    SysTick_Config(72000);
+    USBPU_OFF();
+    flashstorage_init();
+    hw_setup();
+    USB_setup();
+    // close shutter and only after that turn on USB pullup
+    while(!close_shutter() && Tms < 1000) IWDG->KR = IWDG_REFRESH;
+    USBPU_ON();
+
+    uint32_t Terr = Tms + 2*ERRPERIOD;
+    while(1){
+        IWDG->KR = IWDG_REFRESH; // refresh watchdog
+        if(shutterstate == SHUTTER_ERROR && Tms - Terr > ERRPERIOD){
+            USB_sendstr("shutter=error\n");
+            Terr = Tms;
+        }
+        int l = USB_receivestr(inbuff, MAXSTRLEN);
+        if(l < 0) USB_sendstr("usb=error\n");
+        else if(l){
+            const char *ans = parse_cmd(inbuff);
+            if(ans) USB_sendstr(ans);
+        }
+        process_shutter();
+    }
+}