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comparison testavr.c @ 47:13a68734348b

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Add watchdog timer.
author darius@Inchoate
date Mon, 20 Oct 2008 22:22:15 +1030
parents 5898fba6593c
children cb184206344d
comparison
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46:fb272cb82bcb 47:13a68734348b
32 #include <stdio.h> 32 #include <stdio.h>
33 #include <string.h> 33 #include <string.h>
34 #include <ctype.h> 34 #include <ctype.h>
35 #include <stdlib.h> 35 #include <stdlib.h>
36 #include <util/delay.h> 36 #include <util/delay.h>
37 #include <avr/wdt.h>
37 38
38 #include "cons.h" 39 #include "cons.h"
39 #include "1wire.h" 40 #include "1wire.h"
40 #ifdef WITHUSB 41 #ifdef WITHUSB
41 #include "usb.h" 42 #include "usb.h"
42 #endif 43 #endif
43 #include "tempctrl.h" 44 #include "tempctrl.h"
44 45
46 /*
47 * Mirror of the MCUCSR register, taken early during startup.
48 */
49 uint8_t mcucsr __attribute__((section(".noinit")));
50
45 void process_cmd(void); 51 void process_cmd(void);
52
53 /*
54 * Read out and reset MCUCSR early during startup.
55 */
56 void handle_mcucsr(void)
57 __attribute__((section(".init3")))
58 __attribute__((naked));
59 void handle_mcucsr(void) {
60 mcucsr = MCUCSR;
61 MCUCSR = 0;
62 }
46 63
47 int 64 int
48 main(void) { 65 main(void) {
49 /* Disable interrupts while we frob stuff */ 66 /* Disable interrupts while we frob stuff */
50 cli(); 67 cli();
82 cons_init(); 99 cons_init();
83 100
84 printf_P(PSTR("\r\n\r\n===============\r\n" 101 printf_P(PSTR("\r\n\r\n===============\r\n"
85 "Inited!\r\n\r\n")); 102 "Inited!\r\n\r\n"));
86 103
104 if ((mcucsr & _BV(PORF)) == _BV(PORF))
105 printf_P(PSTR("Power on reset\r\n"));
106
107 if ((mcucsr & _BV(EXTRF)) == _BV(EXTRF))
108 printf_P(PSTR("External reset\r\n"));
109
110 if ((mcucsr & _BV(BORF)) == _BV(BORF))
111 printf_P(PSTR("Brown-out reset\r\n"));
112
113 if ((mcucsr & _BV(WDRF)) == _BV(WDRF))
114 printf_P(PSTR("Watchdog reset\r\n"));
115
116 if ((mcucsr & _BV(JTRF)) == _BV(JTRF))
117 printf_P(PSTR("JTAG reset\r\n"));
118
87 tempctrl_init(); 119 tempctrl_init();
88 120
89 /* Ready to go! */ 121 /* Ready to go! */
90 sei(); 122 sei();
91 123
92 #if 0 124 /*
93 DDRA = 0xff; 125 * Enable the watchdog with the largest prescaler. Will cause a
94 DDRC = 0xff; 126 * watchdog reset after approximately 2 s @ Vcc = 5 V
95 while (1) { 127 *
96 printf_P(PSTR("1\r\n")); 128 * Gets reset in the loop below and in the tempctrl.c timer IRQ
97 PORTA = 0xff; 129 */
98 printf_P(PSTR("2\r\n")); 130 wdt_enable(WDTO_2S);
99 PORTC = 0x00; 131
100 printf_P(PSTR("3\r\n"));
101 _delay_us(1);
102 printf_P(PSTR("4\r\n"));
103 PORTA = 0x80;
104 printf_P(PSTR("5\r\n"));
105 PORTC = 0xff;
106 printf_P(PSTR("6\r\n"));
107 }
108 #endif
109
110 #ifdef WITHUSB 132 #ifdef WITHUSB
111 printf_P(PSTR("Calling usb_init\r\n")); 133 printf_P(PSTR("Calling usb_init\r\n"));
112 usb_init(); 134 usb_init();
113 printf_P(PSTR("done\r\n")); 135 printf_P(PSTR("done\r\n"));
114 _delay_us(1000); 136 _delay_us(1000);
116 printf_P(PSTR("> ")); 138 printf_P(PSTR("> "));
117 cmd.state = 0; 139 cmd.state = 0;
118 140
119 /* Wait for user input or an "interrupt" */ 141 /* Wait for user input or an "interrupt" */
120 while (1) { 142 while (1) {
143 wdt_reset();
144
121 tempctrl_update(); 145 tempctrl_update();
122 146
123 if (cmd.state == 255) { 147 if (cmd.state == 255) {
124 process_cmd(); 148 process_cmd();
125 printf_P(PSTR("> ")); 149 printf_P(PSTR("> "));