mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 10:45:11 +03:00
123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
/*
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* main.c
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*
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* Copyright 2014 Edward V. Emelianov <eddy@sao.ru, 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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "main.h"
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#include "hardware_ini.h"
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#include "cdcacm.h"
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#include "timer.h"
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volatile uint32_t Timer = 0; // global timer (milliseconds)
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usbd_device *usbd_dev;
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void check_btns();
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int main(){
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uint32_t Old_timer = 0;
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// RCC clocking: 8MHz oscillator -> 72MHz system
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rcc_clock_setup_in_hse_8mhz_out_72mhz();
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GPIO_init();
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usb_disconnect(); // turn off USB while initializing all
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// USB
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usbd_dev = USB_init();
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// SysTick is a system timer with 1ms period
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SysTick_init();
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tim2_init(); // start transmission
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usb_connect(); // turn on USB
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while(1){
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usbd_poll(usbd_dev);
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if(usbdatalen){ // there's something in USB buffer
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usbdatalen = parce_incoming_buf(usbdatabuf, usbdatalen);
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}
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check_btns();
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if(Timer - Old_timer > 999){ // one-second cycle
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Old_timer += 1000;
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}else if(Timer < Old_timer){ // Timer overflow
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Old_timer = 0;
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}
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}
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}
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// check buttons +/-
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void check_btns(){
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static uint8_t oldstate[2] = {1,1}, done[2] = {0,0}; // old buttons state, event handler flag
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uint8_t i;
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const char ltr[2] = {'+', '-'};
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const uint32_t pins[2] = {BTN_PLUS_PIN, BTN_MINUS_PIN};
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static uint32_t Old_timer[2] = {0,0};
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for(i = 0; i < 2; i++){
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uint8_t new = gpio_get(BTNS_PORT, pins[i]) ? 1 : 0;
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// whe check button state at 3ms after event; don't mind events for 50ms after first
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uint32_t O = Old_timer[i];
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if(!O){ // no previous pauses
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// button was pressed or released just now or holded
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if(new != oldstate[i] || !new){
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Old_timer[i] = Timer;
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oldstate[i] = new;
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}
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}else{ // noice or real event?
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if(Timer - O < 3){ // less than 3ms from last event
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if(new != oldstate[i]){ // noice or button released
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oldstate[i] = new;
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Old_timer[i] = 0;
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}
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continue;
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}
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// more than 50ms from last event
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if(Timer - O > 50 || O > Timer){ // clear new events masking
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oldstate[i] = new;
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Old_timer[i] = 0;
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done[i] = 0;
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}else{
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if(!new && !done[i]){ // button pressed: just now or hold
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usb_send(ltr[i]);
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newline();
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if(i) decrease_speed(); // "+"
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else increase_speed();
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done[i] = 1;
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}
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}
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}
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}
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}
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/**
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* SysTick interrupt: increment global time & send data buffer through USB
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*/
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void sys_tick_handler(){
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Timer++;
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usbd_poll(usbd_dev);
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usb_send_buffer();
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}
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// pause function, delay in ms
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void Delay(uint16_t _U_ time){
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uint32_t waitto = Timer + time;
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while(Timer < waitto);
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}
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/**
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* print current time in milliseconds: 4 bytes for ovrvlow + 4 bytes for time
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* with ' ' as delimeter
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*/
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void print_time(){
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print_int(Timer);
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}
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