mirror of
https://github.com/eddyem/STM8_samples.git
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86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/*
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* main.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 "stm8l.h"
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#include "interrupts.h"
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#include "led.h"
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#define DIGIT_PER 10
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unsigned long Global_time = 0L; // global time in ms
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int ADC_value = 0; // value of last ADC measurement
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U8 LED_delay = 1; // one digit emitting time
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int main() {
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unsigned long T_LED = 0L; // time of last digit update
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unsigned long T_time = 0L; // timer
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int i = -1200;
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// Configure clocking
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CLK_CKDIVR = 0; // F_HSI = 16MHz, f_CPU = 16MHz
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// Configure pins
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CFG_GCR |= 1; // disable SWIM
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LED_init();
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// Configure Timer1
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// prescaler = f_{in}/f_{tim1} - 1
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// set Timer1 to 1MHz: 1/1 - 1 = 15
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TIM1_PSCRH = 0;
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TIM1_PSCRL = 15; // LSB should be written last as it updates prescaler
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// auto-reload each 1ms: TIM_ARR = 1000 = 0x03E8
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TIM1_ARRH = 0x03;
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TIM1_ARRL = 0xE8;
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// interrupts: update
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TIM1_IER = TIM_IER_UIE;
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// auto-reload + interrupt on overflow + enable
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TIM1_CR1 = TIM_CR1_APRE | TIM_CR1_URS | TIM_CR1_CEN;
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// configure ADC
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// select PD2[AIN3] & enable interrupt for EOC
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ADC_CSR = 0x23;
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ADC_TDRL = 0x08; // disable Schmitt triger for AIN3
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// right alignment
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ADC_CR2 = 0x08; // don't forget: first read ADC_DRL!
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// f_{ADC} = f/18 & continuous non-buffered conversion & wake it up
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ADC_CR1 = 0x73;
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ADC_CR1 = 0x73; // turn on ADC (this needs second write operation)
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// enable all interrupts
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enableInterrupts();
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display_int(i++);
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show_next_digit(); // show zero
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// Loop
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do {
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if(((unsigned int)(Global_time - T_time) > DIGIT_PER) || (T_time > Global_time)){ // set next timer value
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T_time = Global_time;
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display_int(i++);
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if(i > 9999) i = -1200;
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// check ADC value to light up DPs proportionaly
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if(ADC_value > 819) display_DP_at_pos(0); // big value == 4 points
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if(ADC_value > 614) display_DP_at_pos(1); // less == 3 points
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if(ADC_value > 410) display_DP_at_pos(2); // little == 2 points
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if(ADC_value > 205) display_DP_at_pos(3); // more little == 1 point
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// values less than 206 == 0
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}
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if((U8)(Global_time - T_LED) > LED_delay){
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T_LED = Global_time;
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show_next_digit();
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}
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} while(1);
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}
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