mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 10:45:11 +03:00
91 lines
2.2 KiB
C
91 lines
2.2 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 "timgpio.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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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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timgpio_init();
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usb_connect(); // turn on USB
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int oldusblen = 0;
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while(1){
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usbd_poll(usbd_dev);
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if(usbdatalen != oldusblen){ // there's something in USB buffer
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parse_incoming_buf(usbdatabuf, &usbdatalen);
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oldusblen = usbdatalen;
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}
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if(transfer_complete){
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P("transfered\n");
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transfer_complete = 0;
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}
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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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/**
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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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