mirror of
https://github.com/eddyem/STM8_samples.git
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390 lines
10 KiB
C
390 lines
10 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 "ports_definition.h"
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#include "interrupts.h"
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#include "main.h"
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/*
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* 0 0000
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* 1 0001
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* 2 0010
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* 3 0011
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* 4 0100
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* 5 0101
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* 6 0110
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* 7 0111
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* 8 1000
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* 9 1001
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* a 1010
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* b 1011
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* c 1100
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* d 1101
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* e 1110
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* f 1111
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*/
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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 U16 ADC_value = 0; // value of last ADC measurement
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volatile U16 Pulse_length = 11; // length of ultrasonic echo pulse
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U8 US_flag = 0;// 0 - conversion in progress; 1 - conversion error; 2 - conversion done; 3 - overflow
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U8 UART_rx[UART_BUF_LEN]; // cycle buffer for received data
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U8 UART_rx_start_i = 0; // started index of received data (from which reading starts)
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U8 UART_rx_cur_i = 0; // index of current first byte in rx array (to which data will be written)
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// ATTENTION! to change global variable in PROGRAM memory, it should be CONST!!!
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//const U8 UART_devNUM = THIS_DEVICE_NUM; // device number, master sais it
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/**
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* Send one byte through UART
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* @param byte - data to send
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*/
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void UART_send_byte(U8 byte){
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UART2_DR = byte;
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while(!(UART2_SR & UART_SR_TC));
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}
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void uart_write(char *str){
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while(*str){
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UART2_DR = *str++;
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while(!(UART2_SR & UART_SR_TC));
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}
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}
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/**
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* Read one byte from Rx buffer
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* @param byte - where to store readed data
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* @return 1 in case of non-empty buffer
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*/
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U8 UART_read_byte(U8 *byte){
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if(UART_rx_start_i == UART_rx_cur_i) // buffer is empty
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return 0;
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*byte = UART_rx[UART_rx_start_i++];
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check_UART_pointer(UART_rx_start_i);
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return 1;
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}
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void printUint(U8 *val, U8 len){
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unsigned long Number = 0;
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U8 i = len;
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char ch;
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U8 decimal_buff[12]; // max len of U32 == 10 + \n + \0
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if(len > 4 || len == 3 || len == 0) return;
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for(i = 0; i < 12; i++)
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decimal_buff[i] = 0;
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decimal_buff[10] = '\n';
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ch = 9;
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switch(len){
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case 1:
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Number = *((U8*)val);
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break;
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case 2:
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Number = *((U16*)val);
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break;
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case 4:
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Number = *((unsigned long*)val);
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break;
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}
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do{
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i = Number % 10L;
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decimal_buff[ch--] = i + '0';
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Number /= 10L;
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}while(Number && ch > -1);
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uart_write((char*)&decimal_buff[ch+1]);
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}
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/*
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U8 U8toHEX(U8 val){
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val &= 0x0f;
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if(val < 10) val += '0';
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else val += 'a' - 10;
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return val;
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}
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void printUintHEX(U8 *val, U8 len){
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U8 i, V;
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uart_write("0x");
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for(i = 0; i < len; i++){
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V = *val++;
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UART_send_byte(U8toHEX(V>>4)); // MSB
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UART_send_byte(U8toHEX(V)); // LSB
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}
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UART_send_byte('\n');
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}*/
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U8 readInt(int *val){
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unsigned long T = Global_time;
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unsigned long R = 0;
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int readed;
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U8 sign = 0, rb, ret = 0, bad = 0;
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do{
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if(!UART_read_byte(&rb)) continue;
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if(rb == '-' && R == 0){ // negative number
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sign = 1;
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continue;
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}
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if(rb < '0' || rb > '9') break; // number ends with any non-digit symbol that will be omitted
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ret = 1; // there's at least one digit
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R = R * 10L + rb - '0';
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if(R > 0x7fff){ // bad value
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R = 0;
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bad = 0;
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}
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}while(Global_time - T < 10000); // wait no longer than 10s
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if(bad || !ret) return 0;
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readed = (int) R;
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if(sign) readed *= -1;
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*val = readed;
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return 1;
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}
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void error_msg(char *msg){
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uart_write("\nERROR: ");
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uart_write(msg);
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UART_send_byte('\n');
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}
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/**
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* Change variable stored in program memory
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* !!! You can change only const values (non-constants are initializes on program start)
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* @param addr - variable address
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* @param new value
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* @return 0 in case of error
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*/
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U8 change_progmem_value(U8 *addr, U8 val){
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// unlock memory
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FLASH_PUKR = EEPROM_KEY2;
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FLASH_PUKR = EEPROM_KEY1;
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// check bit PUL=1 in FLASH_IAPSR
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if(!FLASH_IAPSR & 0x02)
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return 0;
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*addr = val;
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// clear PUL to lock write
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FLASH_IAPSR &= ~0x02;
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return 1;
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}
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/*
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U8 change_eeprom_value(U8 *addr, U8 val){
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// unlock memory
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FLASH_DUKR = EEPROM_KEY1;
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FLASH_DUKR = EEPROM_KEY2;
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// check bit DUL=1 in FLASH_IAPSR
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if(!FLASH_IAPSR & 0x08)
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return 0;
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*addr = val;
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// clear DUL to lock write
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FLASH_IAPSR &= ~0x08;
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return 1;
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}
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*/
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/**
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* Start measurements by ultrasonic distance meter
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* @param
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* @return
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*/
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void US_start(){
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U8 i;
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TIM1_CNTRH = 0; TIM1_CNTRL = 0;
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TIM1_CCR2H = 0; TIM1_CCR2L = 0;
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US_flag = 0;
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// post initial pulse
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PORT(US_OUT_PORT, ODR) |= US_OUT_PIN;
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for(i = 0; i < 160; i++) nop(); // wait at least for 10us
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PORT(US_OUT_PORT, ODR) &= ~US_OUT_PIN;
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// Enable the captures by writing the CC1E and CC2E bits to 1 in the TIM1_CCER1 register.
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TIM1_CCER1 |= 0x11;
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TIM1_CR1 = TIM_CR1_CEN; // turn on timer
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}
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/**
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* Check ultrasonic flag value and send message
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* @param
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* @return
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*/
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void US_check(){
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unsigned long L;
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if(!US_flag) return;
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if(US_flag == 1){ // error - write message
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error_msg("measurement overcapture");
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}else if(US_flag == 3){ // overflow
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error_msg("TIM1 overflow");
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}else{ // all OK - write measured length
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Pulse_length = ((U16)TIM1_CCR2H << 8) | TIM1_CCR2L;
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printUint((U8*)&Pulse_length,2);
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// sound velocity == 340m/s in normal conditions
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// So distance = pulse * 1e-6(us) * 340 / 2
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// in millimeters this is equal of pulse*170/1000
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L = ((unsigned long) Pulse_length) * 170L;
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L /= 1000L;
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uart_write("Distance (mm): ");
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printUint((U8*)&L, 4);
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}
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US_flag = 0;
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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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// unsigned long ul;
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// U16 u16;
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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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// Configure Timer1 for measurement of US pulse width:
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// main frequency: 1MHz
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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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// 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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TIM1_IER = TIM_IER_CC2IE | TIM_IER_CC1IE | TIM_IER_UIE;// enable interrupt on CC2 & overflow
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// 1. Select the active input capture or trigger input for TIM1_CCR1 by writing the CC1S bits
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// to 01 in the TIM1_CCMR1 register (TI1FP1 selected).
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// IC1F = 0 - no filter
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// IC1PSC = 0 - no prescaler
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// TIM1_CCMR1: IC1F[3:0] | IC1PSC[1:0] | CC1S[1:0]
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TIM1_CCMR1 = 1;
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// 3. Select the active input for TIM1_CCR2 by writing the CC2S bits to 10 in the
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// TIM1_CCMR2 register (TI1FP2 selected).
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TIM1_CCMR2 = 2;
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// 2. Select the active polarity for TI1FP1 (used for both capture and counter clear in
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// TIMx_CCR1) by writing the CC1P bit to 0 (TI1FP1 active on rising edge).
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// 4. Select the active polarity for TI1FP2 (used for capture in TIM1_CCR2) by writing the
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// CC2P bit to 1 (TI1FP2 active on falling edge).
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// TIM1_CCER1: CC2NP | CC2NE | CC2P | CC2E | CC1NP | CC1NE | CC1P | CC1E
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TIM1_CCER1 = 0x20;
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// 5. Select the valid trigger input by writing the TS bits to 101 in the
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// TIM1_SMCR register (TI1FP1 selected).
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// 6. Configure the clock/trigger controller in reset mode by writing the
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// SMS bits to 100 in the TIM1_SMCR register
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// TIM1_SMCR: MSM | TS[2:0] | (reserved) | SMS[2:0]
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TIM1_SMCR = 0x54;
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//TIM1_CR1 = 0;
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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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// Configure pins
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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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// PD5 - UART2_TX -- pseudo open-drain output; don't forget an pullup resistor!
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PORT(UART_PORT, DDR) |= UART_TX_PIN;
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PORT(UART_PORT, ODR) &= ~UART_TX_PIN; // turn off N push-down
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//PORT(UART_PORT, CR1) |= UART_TX_PIN;
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// Ultrasonic
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// out, PP
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PORT(US_OUT_PORT, DDR) |= US_OUT_PIN;
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PORT(US_OUT_PORT, CR1) |= US_OUT_PIN;
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//
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// Configure UART
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// 9 bit, no parity, 1 stop (UART_CR3 = 0 - reset value)
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// 57600 on 16MHz: BRR1=0x11, BRR2=0x06
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UART2_BRR1 = 0x11; UART2_BRR2 = 0x06;
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UART2_CR1 = UART_CR1_M; // M = 1 -- 9bits
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UART2_CR2 = UART_CR2_TEN | UART_CR2_REN | UART_CR2_RIEN; // Allow RX, generate ints on rx
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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(US_flag) US_check(); // end of measurement with ultrasonic?
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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"
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"+/-\tLED period\n"
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"A\tprint ADC value\n"
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"D\tmeasure distance by US\n"
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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 < 100) // but not less than 0.1s
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paused_val = 500;
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break;
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case 'A':
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// ul = ADC_value * 3300L;
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// u16 = (U16)(ul >> 10); // 0..3300 - U in mv
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// printUint((U8*)&u16,2);
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printUint((U8*)&ADC_value,2);
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break;
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case 'D':
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US_start();
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break;
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/* case 'N':
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if(readInt(&Ival) && Ival > 0 && Ival < 256)
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if(!change_progmem_value(&UART_devNUM, (unsigned int) Ival))
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error_msg("can't change val");
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break;
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*/
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default:
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break;
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}
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}
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}while(1);
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}
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