restructuring

deprecated/F1/Jeep_generator/main.c

@@ -0,0 +1,122 @@
+/*
+ * main.c
+ *
+ * Copyright 2014 Edward V. Emelianov <eddy@sao.ru, 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include "main.h"
+#include "hardware_ini.h"
+#include "cdcacm.h"
+#include "timer.h"
+
+volatile uint32_t Timer = 0; // global timer (milliseconds)
+usbd_device *usbd_dev;
+void check_btns();
+
+int main(){
+    uint32_t Old_timer = 0;
+    // RCC clocking: 8MHz oscillator -> 72MHz system
+    rcc_clock_setup_in_hse_8mhz_out_72mhz();
+    GPIO_init();
+    usb_disconnect(); // turn off USB while initializing all
+    // USB
+    usbd_dev = USB_init();
+    // SysTick is a system timer with 1ms period
+    SysTick_init();
+    tim2_init(); // start transmission
+    usb_connect(); // turn on USB
+    while(1){
+        usbd_poll(usbd_dev);
+        if(usbdatalen){ // there's something in USB buffer
+            usbdatalen = parse_incoming_buf(usbdatabuf, usbdatalen);
+        }
+        check_btns();
+        if(Timer - Old_timer > 999){ // one-second cycle
+            Old_timer += 1000;
+        }else if(Timer < Old_timer){ // Timer overflow
+            Old_timer = 0;
+        }
+    }
+}
+
+// check buttons +/-
+void check_btns(){
+    static uint8_t oldstate[2] = {1,1}, done[2] = {0,0}; // old buttons state, event handler flag
+    uint8_t i;
+    const char ltr[2] = {'+', '-'};
+    const uint32_t pins[2] = {BTN_PLUS_PIN, BTN_MINUS_PIN};
+    static uint32_t Old_timer[2] = {0,0};
+    for(i = 0; i < 2; i++){
+        uint8_t new = gpio_get(BTNS_PORT, pins[i]) ? 1 : 0;
+        // whe check button state at 3ms after event; don't mind events for 50ms after first
+        uint32_t O = Old_timer[i];
+        if(!O){ // no previous pauses
+                // button was pressed or released just now or holded
+                if(new != oldstate[i] || !new){
+                    Old_timer[i] = Timer;
+                    oldstate[i] = new;
+                }
+        }else{ // noice or real event?
+            if(Timer - O < 3){ // less than 3ms from last event
+                if(new != oldstate[i]){ // noice or button released
+                    oldstate[i] = new;
+                    Old_timer[i] = 0;
+                }
+                continue;
+            }
+            // more than 50ms from last event
+            if(Timer - O > 50 || O > Timer){ // clear new events masking
+                oldstate[i] = new;
+                Old_timer[i] = 0;
+                done[i] = 0;
+            }else{
+                if(!new && !done[i]){ // button pressed: just now or hold
+                    usb_send(ltr[i]);
+                    newline();
+                    if(i) decrease_speed(); // "+"
+                    else increase_speed();
+                    done[i] = 1;
+                }
+            }
+        }
+    }
+}
+
+
+/**
+ * SysTick interrupt: increment global time & send data buffer through USB
+ */
+void sys_tick_handler(){
+    Timer++;
+    usbd_poll(usbd_dev);
+    usb_send_buffer();
+}
+
+// pause function, delay in ms
+void Delay(uint16_t _U_ time){
+    uint32_t waitto = Timer + time;
+    while(Timer < waitto);
+}
+
+/**
+ * print current time in milliseconds: 4 bytes for ovrvlow + 4 bytes for time
+ * with ' ' as delimeter
+ */
+void print_time(){
+    print_int(Timer);
+}