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https://github.com/eddyem/STM8_samples.git
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101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/*
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* blinky.c
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*
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* Copyright 2014 Edward V. Emelianoff <eddy@sao.ru>
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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 "ports_definition.h"
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#include "interrupts.h"
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#include "uart.h"
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#include "si7005.h"
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volatile unsigned long Global_time = 0L; // global time in ms
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U16 paused_val = 500; // interval between LED flashing
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int main() {
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unsigned long T = 0L, siT = 0L;
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U8 rb;
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CFG_GCR |= 1; // disable SWIM
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// Configure clocking
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CLK_CKDIVR = 0; // F_HSI = 16MHz, f_CPU = 16MHz
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// Timer 4 (8 bit) used as system tick timer
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// prescaler == 128 (2^7), Tfreq = 125kHz
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// period = 1ms, so ARR = 125
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TIM4_PSCR = 7;
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TIM4_ARR = 125;
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// interrupts: update
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TIM4_IER = TIM_IER_UIE;
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// auto-reload + interrupt on overflow + enable
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TIM4_CR1 = TIM_CR1_APRE | TIM_CR1_URS | TIM_CR1_CEN;
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// PC2 - PP output (on-board LED)
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PORT(LED_PORT, DDR) |= LED_PIN;
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PORT(LED_PORT, CR1) |= LED_PIN;
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uart_init();
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si7005_setup();
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// enable all interrupts
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enableInterrupts();
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// Loop
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do{
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if((Global_time - T > paused_val) || (T > Global_time)){
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T = Global_time;
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PORT(LED_PORT, ODR) ^= LED_PIN; // blink on-board LED
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}
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if(UART_read_byte(&rb)){ // buffer isn't empty
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switch(rb){
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case 'h': // help
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uart_write("\nPROTO:\n+/-\tLED period\n"
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"I\tread Si7005 device id\n"
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"T\tread themperature\n"
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"H\tread humidity\n"
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//"O\tread OPT"
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);
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break;
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case '+':
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paused_val += 100;
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if(paused_val > 10000)
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paused_val = 500; // but not more than 10s
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break;
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case '-':
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paused_val -= 100;
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if(paused_val < 500) // but not less than 0.5s
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paused_val = 500;
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break;
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case 'I':
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si7005_read_ID();
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break;
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case 'T':
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si7005_read_T();
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break;
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case 'H':
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si7005_read_H();
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break;
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}
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}
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if(Global_time != siT){
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siT = Global_time;
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si7005_process();
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}
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}while(1);
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}
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