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cloudbase.mooo.com Git - z180-stamp.git/blob - avr/main.c
7 #include <util/delay.h>
8 #include <avr/interrupt.h>
16 #include "con-utils.h"
22 #define udelay(n) _delay_us(n)
26 /*--------------------------------------------------------------------------*/
29 __attribute__ ((naked
)) __attribute__ ((section (".init3")))
30 void preset_ram (void)
32 for (uint8_t *p
= RAMSTART
; p
<= (uint8_t *) RAMEND
; p
++)
37 static const FLASH
char * const FLASH rreasons
[] = {
46 void print_reset_reason(void)
48 uint8_t r
= mcusr
& 0x1f;
49 const FLASH
char * const FLASH
*p
= rreasons
;
51 printf_P(PSTR("### Reset reason(s): %s"), r
? "" : "none");
52 for ( ; r
; p
++, r
>>= 1) {
59 printf_P(PSTR(".\n"));
66 Stat
|= S_MSG_PENDING
;
72 /* save and clear reset reason(s) */
73 /* TODO: move to init section? */
81 /* Disable JTAG Interface regardless of the JTAGEN fuse setting. */
85 /* Disable peripherals. Enable individually in respective init function. */
87 _BV(PRTIM2
) | _BV(PRTIM0
) | _BV(PRTIM1
) |
88 _BV(PRSPI
) | _BV(PRUSART0
) | _BV(PRADC
);
90 PRR1
= _BV(PRTIM5
) | _BV(PRTIM4
) | _BV(PRTIM3
) |
91 _BV(PRUSART3
) | _BV(PRUSART2
) | _BV(PRUSART1
);
94 /* disable analog comparator */
103 PRR1
&= ~_BV(PRTIM3
);
104 OCR3A
= F_CPU
/ 1000 - 1; /* Timer3: 1000Hz interval (OC3A) */
105 TCCR3B
= (0b01<<WGM32
)|(0b001<<CS30
); /* CTC Mode, Prescaler 1 */
106 TIMSK3
= _BV(OCIE3A
); /* Enable TC2.oca interrupt */
108 /* INT5 falling edge */
109 EICRB
= (EICRB
& ~(0b11 << ISC50
)) | 0b10 << ISC50
;
115 int reset_reason_is_power_on(void)
117 return (mcusr
& _BV(PORF
)) != 0;
120 /*--------------------------------------------------------------------------*/
122 /* Stored value of bootdelay, used by autoboot_command() */
123 static int stored_bootdelay
;
126 /***************************************************************************
127 * Watch for 'delay' seconds for autoboot stop.
128 * returns: 0 - no key, allow autoboot
132 static int abortboot(int bootdelay
)
138 printf_P(PSTR("Hit any key to stop autoboot: %2d "), bootdelay
);
140 #if defined CONFIG_ZERO_BOOTDELAY_CHECK
142 * Check if key already pressed
143 * Don't check if bootdelay < 0
145 if (bootdelay
>= 0) {
146 if (tstc()) { /* we got a key press */
147 (void) my_getchar(); /* consume input */
148 my_puts_P(PSTR("\b\b\b 0"));
149 abort
= 1; /* don't auto boot */
154 while ((bootdelay
> 0) && (!abort
)) {
159 if (tstc()) { /* we got a key press */
160 abort
= 1; /* don't auto boot */
161 bootdelay
= 0; /* no more delay */
165 } while (!abort
&& get_timer(ts
) < 1000);
167 printf_P(PSTR("\b\b\b%2d "), bootdelay
);
176 const char *bootdelay_process(void)
181 bootdelay
= (int) getenv_ulong(PSTR(ENV_BOOTDELAY
), 10, CONFIG_BOOTDELAY
);
184 debug("### main_loop entered: bootdelay=%d\n\n", bootdelay
);
187 s
= getenv(PSTR(ENV_BOOTCMD
));
188 stored_bootdelay
= bootdelay
;
193 void autoboot_command(const char *s
)
195 debug("### main_loop: bootcmd=\"%s\"\n", s
? s
: PSTR("<UNDEFINED>"));
198 if (stored_bootdelay
!= -1 && s
&& !abortboot(stored_bootdelay
)) {
199 run_command_list(s
, -1);
209 s
= bootdelay_process();
222 if (reset_reason_is_power_on())
223 _delay_ms(CONFIG_PWRON_DELAY
);
225 serial_setup(getenv_ulong(PSTR(ENV_BAUDRATE
), 10, CONFIG_BAUDRATE
));
229 debug("\n=========================< (RE)START DEBUG >=========================\n");
230 print_reset_reason();
234 unsigned long i_speed
= getenv_ulong(PSTR("i2c_clock"), 10, CONFIG_SYS_I2C_CLOCK
);
235 debug("### Setting I2C clock Frequency to %lu Hz.\n", i_speed
);
238 i2c_init(CONFIG_SYS_I2C_CLOCK
);
241 printf_P(PSTR("\nATMEGA1281+Z8S180 Stamp Monitor\n\n"));