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| 1 | /* | |
| 2 | * Pajeci_stanice_2012.c | |
| 3 | * Processor: Atmel ATmega16 | |
| 4 | * Created: 6.6.2012 23:15:40 | |
| 5 | * Author: Luboš Fukan, Czech Republic | |
| 6 | */ | |
| 7 | ||
| 8 | #include <avr/io.h> | |
| 9 | #include <util/delay.h> | |
| 10 | #include <compat/deprecated.h> | |
| 11 | ||
| 12 | #define LCD | |
| 13 | #include "lcd_lib.h" | |
| 14 | char text[8]; | |
| 15 | ||
| 16 | void max6675_select() {
| |
| 17 | cbi(PORTB, 4); | |
| 18 | - | PORTA=0b11111110; |
| 18 | + | PORTA=0b11111110; //led diode indication instead of debugger :(( |
| 19 | } | |
| 20 | ||
| 21 | void max6675_deselect() {
| |
| 22 | - | sbi(PORTB, 4); |
| 22 | + | sbi(PORTB, 4); |
| 23 | - | PORTA=0b01111111; |
| 23 | + | PORTA=0b01111111; //led diode indication instead of debugger :(( |
| 24 | } | |
| 25 | ||
| 26 | uint8_t send_spi(uint8_t spi_data) | |
| 27 | {
| |
| 28 | SPDR = spi_data; | |
| 29 | while (!(SPSR & (1<<SPIF))); | |
| 30 | return SPDR; | |
| 31 | } | |
| 32 | ||
| 33 | void max6675_read_temp() | |
| 34 | {
| |
| 35 | /* Enable SPI, Master, set clock rate fck/16 */ | |
| 36 | SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0); | |
| 37 | ||
| 38 | short value = 0; | |
| 39 | float temp = 0; | |
| 40 | ||
| 41 | uint8_t highByte=0; | |
| 42 | uint8_t lowByte=0; | |
| 43 | ||
| 44 | max6675_select(); | |
| 45 | _delay_ms(1000); | |
| 46 | highByte = send_spi(0); | |
| 47 | lowByte = send_spi(0); | |
| 48 | max6675_deselect(); | |
| 49 | ||
| 50 | if (lowByte & (1<<2)) {
| |
| 51 | LCDGotoXY(0,0); | |
| 52 | sprintf(text,"TC NOT C"); | |
| 53 | LCDstring(text,8); | |
| 54 | LCDGotoXY(0,1); | |
| 55 | sprintf(text,"ONNECTED"); | |
| 56 | LCDstring(text,8); | |
| 57 | } else {
| |
| 58 | value = (highByte << 5 | lowByte>>3); | |
| 59 | temp = (value*0.25); | |
| 60 | // Multiply the value by 0.25 to get temp in ˚C | |
| 61 | LCDGotoXY(0,0); | |
| 62 | sprintf(text,"TC TEMP:"); | |
| 63 | LCDstring(text,8); | |
| 64 | LCDGotoXY(0,1); | |
| 65 | sprintf(text,"%0.8d", temp); | |
| 66 | LCDstring(text,8); | |
| 67 | } | |
| 68 | ||
| 69 | } | |
| 70 | ||
| 71 | int main(void) | |
| 72 | {
| |
| 73 | DDRA=0b11111111; | |
| 74 | ||
| 75 | LCDinit(); | |
| 76 | LCDclr(); | |
| 77 | ||
| 78 | LCDGotoXY(0,0); | |
| 79 | sprintf(text," MAX667"); | |
| 80 | LCDstring(text,8); | |
| 81 | LCDGotoXY(0,1); | |
| 82 | sprintf(text,"5 TEST "); | |
| 83 | LCDstring(text,8); | |
| 84 | ||
| 85 | while (1) | |
| 86 | {
| |
| 87 | max6675_read_temp(); | |
| 88 | _delay_ms(500); | |
| 89 | } | |
| 90 | } |
