mirror of
https://github.com/eddyem/STM8_samples.git
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145 lines
3.7 KiB
C
145 lines
3.7 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 "onewire.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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volatile U8 waitforread = 0;
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// show received scrtchpad
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void show_received_data(){
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char i;
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// uart_write("show_received_data()\n");
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for(i = 8; i > -1; i--){
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if(i < 8) UART_send_byte(',');
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printUHEX(ow_data_array[i]);
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}
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ow_process_resdata = NULL;
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uart_write("\nTemp: ");
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print_long(gettemp());
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uart_write("dergC\n");
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}
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// ask to read N bytes after temper request
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void send_read_seq(){
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// uart_write("send_read_seq()\n");
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onewire_receive_bytes(9);
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ow_process_resdata = show_received_data;
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}
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void wait_reading(){
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// uart_write("wait_reading()\n");
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waitforread = 1;
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ow_process_resdata = NULL;
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}
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int main() {
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unsigned long T = 0L;
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// int Ival;
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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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onewire_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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if(!OW_CONVERSION_DONE) uart_write("conversion in process\n");
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}
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process_onewire();
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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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case 'H':
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uart_write("\nPROTO:\n+/-\tLED period\nS/s\tset/get Mspeed\n"
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"r: reset 1-wire\n"
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"w: read temper\n");
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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 'r':
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if(!onewire_reset()) uart_write("not ");
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uart_write("found 1-wire devices (echo len: ");
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print_long((long)onewire_gotlen);
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uart_write(")\n");
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break;
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case 'w':
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if(!onewire_reset()){
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uart_write("no devices found!");
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break;
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}
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ow_data_array[0] = OW_CONVERT_T;
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ow_data_array[1] = OW_SKIP_ROM;
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ow_process_resdata = wait_reading;
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onewire_send_bytes(2);
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break;
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}
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}
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if(waitforread){
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if(OW_CONVERSION_DONE){
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if(onewire_reset()){
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waitforread = 0;
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ow_process_resdata = send_read_seq;
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ow_data_array[0] = OW_READ_SCRATCHPAD;
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ow_data_array[1] = OW_SKIP_ROM;
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onewire_send_bytes(2);
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}else uart_write("error reseting!");
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}
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}
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}while(1);
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}
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