| 1 | //-----------------------------------------------------------------------------
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| 2 |
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| 3 | #include "application.h"
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| 4 | #include <avr/wdt.h>
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| 5 |
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| 6 |
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| 7 | //-----------------------------------------------------------------------------
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| 8 |
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| 9 | volatile U08 app_reset_source;
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| 10 | //-----------------------------------------------------------------------------
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| 11 |
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| 12 | void app_init(void)
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| 13 | {
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| 14 | app_reset_source = MCUSR; // Save last reset source
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| 15 | MCUSR = 0x00; // Clear reset source for next reset cycle
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| 16 |
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| 17 |
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| 18 | // Dangerous here: I still do not know much about the watchdog.
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| 19 | // This code is still from Udo Juerss.
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| 20 |
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| 21 | // The watchdog timer is disabled by default ("startup.asm")
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| 22 | #ifdef USE_WATCHDOG
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| 23 | WDTCSR = WDTOE | (1 << WDE); // Enable watchdog reset (~16ms)
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| 24 | #endif
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| 25 |
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| 26 | // define PORTS
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| 27 | // USART
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| 28 | DDRD &= ~(1<<PD0); // PD0 = RXD is input
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| 29 | DDRD |= 1<<PD1; // PD1 = TXD is output
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| 30 |
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| 31 |
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| 32 | // SPARE OUT/-INPUTS
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| 33 | DDRB |= (1<<PB2) | (1<<PB3); // set Out1_spare & out2_spare as outputs
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| 34 | DDRA &= ~(1<<PA7); // set In1_spare as input
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| 35 | DDRC &= ~(1<<PC7); // set In2_spare as input
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| 36 | PORTA |= (1<<PA7); // swtich on pullup on In1_spare
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| 37 | PORTC |= (1<<PC7); // swtich on pullup on In2_spare
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| 38 |
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| 39 | // ATmega internal ADC input
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| 40 | DDRA &= ~(1<<PA6);
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| 41 |
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| 42 | // MUXER ADDRESS OUTs
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| 43 | DDRA |= 0x3F; // SA-pins -> output
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| 44 | DDRC |= 0x7F; // SB-pins -> output
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| 45 |
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| 46 | // SPI
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| 47 | // set all CS's: output
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| 48 | DDRB |= (1 << SPI_E_CS);
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| 49 | DDRD |= (1 << SPI_AD_CS) |(1 << SPI_M_CS) |(1 << SPI_A_CS);
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| 50 |
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| 51 | // set all Chips selects HIGH
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| 52 | PORTB |= (1 << SPI_E_CS);
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| 53 | PORTD |= (1 << SPI_AD_CS) |(1 << SPI_M_CS) |(1 << SPI_A_CS);
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| 54 |
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| 55 | // set MOSI and SCK: output & // set MISO: input
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| 56 | SPI_DDR |= (1 << SPI_MOSI);
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| 57 | SPI_DDR |= (1 << SPI_SCLK);
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| 58 | SPI_DDR &= ~(1 << SPI_MISO);
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| 59 |
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| 60 | // set MOSI, SCK: HIGH. MISO leave alone.
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| 61 | SPI_PRT |= (1 << SPI_MOSI);
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| 62 | SPI_PRT |= (1 << SPI_SCLK);
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| 63 | //SPI_PRT |= (1 << SPI_MISO);
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| 64 |
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| 65 | // ADC
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| 66 | DDRD &= ~(1<<PD6); // PD6 is AD_READY input
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| 67 | DDRD |= 1<<PD7; // PD7 is AD_RESET output
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| 68 |
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| 69 | // ACCELEROMETER
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| 70 | DDRD &= ~(1<<PD2); // PD2 is ACC_READY input
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| 71 |
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| 72 | //MAX6662 <--- not assembled
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| 73 | // DDRB &= ~(1<<PB0); // PB0 is over temperature alert input
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| 74 | // DDRB &= ~(1<<PB1); // PB1 is general temperature altert input
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| 75 | }
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| 76 |
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| 77 |
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| 78 |
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| 79 | //-----------------------------------------------------------------------------
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| 80 |
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| 81 | void app_set_watchdog_prescaler(tWDT_PRESCALE wdt_prescale) // Set watchdog prescale
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| 82 | {
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| 83 | U08 sreg_backup = SREG; // Copy status register to variable
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| 84 | U08 wdtcsr_value = WDE + wdt_prescale; // Set new prescale value to variable
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| 85 |
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| 86 | cli(); // Disable interrups
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| 87 | wdt_reset(); // Reset watchdog
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| 88 |
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| 89 | WDTCR |= (1 << WDTOE) | (1 << WDE); // Unlock register access, 4 cycles to store new value
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| 90 | WDTCR = wdtcsr_value; // Set new watchdog prescaler
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| 91 | SREG = sreg_backup; // Restore status register
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| 92 | }
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