mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 18:55:13 +03:00
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
|
|
* main.c
|
|
*
|
|
* Copyright 2015 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 "ocm.h"
|
|
#include "usbkeybrd.h"
|
|
|
|
volatile uint32_t Timer = 0; // global timer (milliseconds)
|
|
|
|
/*
|
|
* SysTick used for system timer with period of 1ms
|
|
*/
|
|
void SysTick_init(){
|
|
systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8); // Systyck: 72/8=9MHz
|
|
systick_set_reload(8999); // 9000 pulses: 1kHz
|
|
systick_interrupt_enable();
|
|
systick_counter_enable();
|
|
}
|
|
|
|
int main(void){
|
|
uint32_t oldT = 0;
|
|
|
|
rcc_clock_setup_in_hsi_out_48mhz();
|
|
SysTick_init();
|
|
/*
|
|
// if PC11 connected to usb 1.5kOhm pull-up through transistor
|
|
rcc_periph_clock_enable(RCC_GPIOC);
|
|
gpio_set(GPIOC, GPIO11);
|
|
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
|
|
GPIO_CNF_OUTPUT_PUSHPULL, GPIO11);
|
|
*/
|
|
usbkeybrd_setup();
|
|
/*
|
|
int i;
|
|
for (i = 0; i < 0x80000; i++)
|
|
__asm__("nop");
|
|
gpio_clear(GPIOC, GPIO11);
|
|
*/
|
|
uint32_t seconds_ctr = 0;
|
|
while (1){
|
|
poll_usbkeybrd();
|
|
if(Timer - oldT > 999 || oldT > Timer){
|
|
print_int(seconds_ctr++);
|
|
newline();
|
|
oldT = Timer;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* SysTick interrupt: increment global time & send data buffer through USB
|
|
*/
|
|
void sys_tick_handler(){
|
|
Timer++;
|
|
process_usbkbrd();
|
|
}
|