mirror of
https://github.com/eddyem/STM8_samples.git
synced 2025-12-06 10:45:12 +03:00
113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
/*
|
|
* blinky.c
|
|
*
|
|
* Copyright 2014 Edward V. Emelianoff <eddy@sao.ru>
|
|
*
|
|
* 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 "ports_definition.h"
|
|
#include "interrupts.h"
|
|
#include "uart.h"
|
|
#include "spi.h"
|
|
|
|
volatile unsigned long Global_time = 0L; // global time in ms
|
|
U16 paused_val = 500; // interval between LED flashing
|
|
|
|
int main() {
|
|
unsigned long T = 0L;
|
|
U8 rb, waitfor = 0;
|
|
U8 *outbuf = "Hello, world";
|
|
U8 inbuf[13] = {0};
|
|
U8 inoutbuf[] = {'G','o','o','d','b','y','e',0};
|
|
CFG_GCR |= 1; // disable SWIM
|
|
// Configure clocking
|
|
CLK_CKDIVR = 0; // F_HSI = 16MHz, f_CPU = 16MHz
|
|
// Timer 4 (8 bit) used as system tick timer
|
|
// prescaler == 128 (2^7), Tfreq = 125kHz
|
|
// period = 1ms, so ARR = 125
|
|
TIM4_PSCR = 7;
|
|
TIM4_ARR = 125;
|
|
// interrupts: update
|
|
TIM4_IER = TIM_IER_UIE;
|
|
// auto-reload + interrupt on overflow + enable
|
|
TIM4_CR1 = TIM_CR1_APRE | TIM_CR1_URS | TIM_CR1_CEN;
|
|
|
|
// PC2 - PP output (on-board LED)
|
|
PORT(LED_PORT, DDR) |= LED_PIN;
|
|
PORT(LED_PORT, CR1) |= LED_PIN;
|
|
|
|
uart_init();
|
|
spi_init();
|
|
|
|
// enable all interrupts
|
|
enableInterrupts();
|
|
|
|
// Loop
|
|
do{
|
|
if((Global_time - T > paused_val) || (T > Global_time)){
|
|
T = Global_time;
|
|
PORT(LED_PORT, ODR) ^= LED_PIN; // blink on-board LED
|
|
}
|
|
if(waitfor && spi_buf_sent()){
|
|
if(waitfor == 1)
|
|
uart_write(inbuf);
|
|
else
|
|
uart_write(inoutbuf);
|
|
waitfor = 0;
|
|
}
|
|
if(UART_read_byte(&rb)){ // buffer isn't empty
|
|
switch(rb){
|
|
case 'h': // help
|
|
case 'H':
|
|
UART_send_byte(rb);
|
|
uart_write("\nPROTO:\n+/-\tLED period\n"
|
|
);
|
|
break;
|
|
case '+':
|
|
UART_send_byte(rb);
|
|
paused_val += 100;
|
|
if(paused_val > 10000)
|
|
paused_val = 500; // but not more than 10s
|
|
break;
|
|
case '-':
|
|
UART_send_byte(rb);
|
|
paused_val -= 100;
|
|
if(paused_val < 500) // but not less than 0.5s
|
|
paused_val = 500;
|
|
break;
|
|
case 's':
|
|
spi_init();
|
|
break;
|
|
case 'b':
|
|
printUHEX(SPI_SR);
|
|
break;
|
|
case '1':
|
|
spi_send_buffer(outbuf, 12, inbuf);
|
|
waitfor = 1;
|
|
break;
|
|
case '2':
|
|
spi_send_buffer(inoutbuf, 7, inoutbuf);
|
|
waitfor = 2;
|
|
break;
|
|
default:
|
|
UART_send_byte(spi_send_byte(rb)); // send received byte to SPI & write ans to UART
|
|
}
|
|
}
|
|
}while(1);
|
|
}
|
|
|
|
|