source: firmware/FSC/src/application.c@ 10108

Last change on this file since 10108 was 10108, checked in by lutz, 12 years ago
just a test
File size: 4.9 KB
Line 
1//-----------------------------------------------------------------------------
2
3#include "application.h"
4 #include <avr/wdt.h>
5
6//
7
8//-----------------------------------------------------------------------------
9
10volatile U08 app_reset_source;
11//-----------------------------------------------------------------------------
12
13void app_init(void)
14{
15 app_reset_source = MCUSR; // Save last reset source
16 MCUSR = 0x00; // Clear reset source for next reset cycle
17
18 // The watchdog timer is disabled by default ("startup.asm")
19#ifdef USE_WATCHDOG
20 WDTCSR = WDTOE | (1 << WDE); // Enable watchdog reset (~16ms)
21#endif
22
23#ifndef F_CPU
24#define F_CPU 8000000UL //cpu frequency
25#endif
26
27//#ifdef (F_CPU == 16000000UL)
28/*#else
29 #warning *** Compiling for _MCU_CLOCK_FREQUENCY_ Hz
30 #error *** Invalid clock selected! ***
31#endif*/
32 // Tell the user the operating frequency
33//#warning *** Compiling for DF_CPU Hz
34/*
35 // Set selected CPU clock
36#if (_MCU_CLOCK_FREQUENCY_ == 16000000)
37 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
38 CLKPR = 0; // Set clock prescaler to division by 1 (16MHz clock with 16MHz crystal)
39#elif (_MCU_CLOCK_FREQUENCY_ == 8000000)
40 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
41 CLKPR = 1; // Set clock prescaler to division by 2 (8MHz clock with 16MHz crystal)
42#elif (_MCU_CLOCK_FREQUENCY_ == 4000000)
43 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
44 CLKPR = 2; // Set clock prescaler to division by 4 (4MHz clock with 16MHz crystal)
45#elif (_MCU_CLOCK_FREQUENCY_ == 2000000)
46 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
47 CLKPR = 3; // Set clock prescaler to division by 8 (2MHz clock with 16MHz crystal)
48#elif (_MCU_CLOCK_FREQUENCY_ == 1000000)
49 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
50 CLKPR = 4; // Set clock prescaler to division by 16 (1MHz clock with 16MHz crystal)
51#else
52 #warning *** Compiling for _MCU_CLOCK_FREQUENCY_ Hz
53 #error *** Invalid clock selected! ***
54#endif
55
56 // Tell the user the operating frequency
57#warning *** Compiling for _MCU_CLOCK_FREQUENCY_ Hz
58
59*/
60
61/* (ATmega32 has no prescaler)
62 // Set selected CPU clock
63#if (F_CPU == 16000000)
64 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
65 CLKPR = 0; // Set clock prescaler to division by 1 (16MHz clock with 16MHz crystal)
66#elif (F_CPU == 8000000)
67 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
68 CLKPR = 1; // Set clock prescaler to division by 2 (8MHz clock with 16MHz crystal)
69#elif (F_CPU == 4000000)
70 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
71 CLKPR = 2; // Set clock prescaler to division by 4 (4MHz clock with 16MHz crystal)
72#elif (F_CPU == 2000000)
73 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
74 CLKPR = 3; // Set clock prescaler to division by 8 (2MHz clock with 16MHz crystal)
75#elif (F_CPU == 1000000)
76 CLKPR = CLKPCE; // Enable clock prescaler by writing 0x80 to CLKPR
77 CLKPR = 4; // Set clock prescaler to division by 16 (1MHz clock with 16MHz crystal)
78#else
79 #warning *** Compiling for F_CPU Hz
80 #error *** Invalid clock selected! ***
81#endif
82
83
84
85 // Tell the user the operating frequency
86#warning *** Compiling for F_CPU Hz
87
88
89 // Turn off unused modules for this application
90 PRR =
91 (
92#ifndef USE_TWI
93 TWEN // I2C module
94 #warning *** Module "TWI" not enabled!
95#endif
96
97 (ATmega32 Can't disable TIMER modules)
98#ifndef USE_TIMER2
99 | PRTIM2 // Timer2
100 #warning *** Module "TIMER2" not enabled!
101#endif
102#ifndef USE_TIMER1
103 | PRTIM1 // Timer1
104 #warning *** Module "TIMER1" not enabled!
105#endif
106#ifndef USE_TIMER0
107 | PRTIM0 // Timer0
108 #warning *** Module "TIMER0" not enabled!
109#endif
110
111#ifndef USE_USART0
112 | PRUSART0 // USART0
113 #warning *** Module "USART0" not enabled!
114#endif
115
116#ifndef USE_SPI
117 | SPE // SPI
118 #warning *** Module "SPI" not enabled!
119#endif
120
121#ifndef USE_ADC
122 | ADEN // ADC
123 #warning *** Module "ADC" not enabled!
124#endif
125 );
126
127#ifndef USE_ACO // Analog comparator
128 ACSR = ACME;
129 #warning *** Module "ACO" not enabled!
130#endif
131
132 PORTC |= PC6; // Enable pullup for PC6_RESET
133
134 // Initialize switches S1, S2 and S3
135 //S1_INIT(); // Set S1 pin to input
136 //S2_INIT(); // Set S2 pin to input
137 //S3_INIT(); // Set S3 pin to input
138*/
139}
140
141
142
143//-----------------------------------------------------------------------------
144
145void app_set_watchdog_prescaler(tWDT_PRESCALE wdt_prescale) // Set watchdog prescale
146{
147 U08 sreg_backup = SREG; // Copy status register to variable
148 U08 wdtcsr_value = WDE + wdt_prescale; // Set new prescale value to variable
149
150 cli(); // Disable interrups
151 wdt_reset(); // Reset watchdog
152
153 WDTCR |= (1 << WDTOE) | (1 << WDE); // Unlock register access, 4 cycles to store new value
154 WDTCR = wdtcsr_value; // Set new watchdog prescaler
155 SREG = sreg_backup; // Restore status register
156}
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