mirror of
https://github.com/eddyem/STM8_samples.git
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125 lines
3.9 KiB
C
125 lines
3.9 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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#include "zacwire.h"
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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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U8 dp_err_pos = 0;
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U8 curbit = 0;
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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 PD3[TIM2_CH2] as input for zacwire
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PD_CR1 |= GPIO_PIN3; // weak pullup
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CCR |= 0x28; // make shure that we are on level 3
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EXTI_CR1 = 0x80; // PDIS = 10 - falling edge
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// PA2 is output for zacwire powering
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PA_DDR |= GPIO_PIN2; // output
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PA_CR1 |= GPIO_PIN2; // push-pull
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// Configure Timer1
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// prescaler = f_{in}/f_{tim1} - 1
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// set Timer1 to 1MHz: 16/1 - 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 Timer2:
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// capture/compare channel
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// channel CC1 (0->1) stores low pulse length,
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// channel CC2 (1->0) stores time period between two consequent zero-transitions
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//TIM2_IER = TIM_IER_CC2IE;// |TIM_IER_UIE ;
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//TIM2_CCER1 = 0x30; // CC2: enable, capture on 1->0; CC1: disable
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// TIM2 frequency == 16MHz / 2^TIM2_PSCR
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// main frequency: 1MHz
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// TIM2_PSCR = 15;
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/*
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TIM2_PSCR = 1; // 8MHz
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TIM2_CCMR2 = 1;
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TIM2_CCER1 = 0x10; // CC2: enable, capture on 0->1
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TIM2_IER = TIM_IER_CC2IE;
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*/
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/*
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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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*/
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// enable all interrupts
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enableInterrupts();
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set_display_buf("----"); // on init show ----
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show_next_digit();
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// Loop
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do {
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if(((unsigned int)(Global_time - T_time) > 1000) || (T_time > Global_time)){ // once per 3 seconds we start measurement
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T_time = Global_time;
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if(ZW_data_ready){ // measurement is ready - display results
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ZW_data_ready = 0;
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display_int(Temperature_value); // fill display buffer with current temperature
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display_DP_at_pos(2); // we always show DP here
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/*display_int((int)ZW_bits[curbit++]);
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if(curbit == 20){
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curbit = 0;
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ZW_data_ready = 0;
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}
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display_DP_at_pos(dp_err_pos++); // turn off old DP
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if(dp_err_pos > 3)
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dp_err_pos = 0;*/
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}//else
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if(!temp_measurement){ // there's no active measurements
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ZW_on();
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}else{ // error: no sensor
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ZW_off();
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set_display_buf("E 0");
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display_DP_at_pos(dp_err_pos++); // turn off old DP
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if(dp_err_pos > 3)
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dp_err_pos = 0;
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}
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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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