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/*
* Copyright © 2011 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#ifndef _AO_ARCH_H_
#define _AO_ARCH_H_
#include <avr/io.h>
#include <avr/interrupt.h>
#ifdef AVR_DEMO
#define TEENSY 1
#endif
#if TEENSY
#define F_CPU 16000000UL // 16 MHz
#else
#define F_CPU 8000000UL // 8 MHz
#endif
/*
* AVR definitions and code fragments for AltOS
*/
#define AO_STACK_SIZE 128
/* Various definitions to make GCC look more like SDCC */
#define ao_arch_naked_declare __attribute__((naked))
#define ao_arch_naked_define
#define __pdata
#define __data
#define __xdata
#define __code const
#define __reentrant
#define __critical
#define __interrupt(n)
#define ao_arch_reboot() /* XXX */
#define ao_arch_nop() asm("nop")
#define ao_arch_interrupt(n) /* nothing */
#undef putchar
#undef getchar
#define putchar(c) ao_putchar(c)
#define getchar ao_getchar
extern void putchar(char c);
extern char getchar(void);
extern int ao_serial_number;
#define ao_arch_init_stack(task, start) do { \
uint8_t *sp = task->stack + AO_STACK_SIZE - 1; \
uint16_t a = (uint16_t) start; \
int i; \
\
/* Return address */ \
PUSH8(sp, a); \
PUSH8(sp, (a >> 8)); \
\
/* Clear register values */ \
i = 32; \
while (i--) \
PUSH8(sp, 0); \
\
/* SREG with interrupts enabled */ \
PUSH8(sp, 0x80); \
task->sp = sp; \
} while (0);
#define ao_arch_save_context() do { \
asm("push r31" "\n\t" "push r30"); \
asm("push r29" "\n\t" "push r28" "\n\t" "push r27" "\n\t" "push r26" "\n\t" "push r25"); \
asm("push r24" "\n\t" "push r23" "\n\t" "push r22" "\n\t" "push r21" "\n\t" "push r20"); \
asm("push r19" "\n\t" "push r18" "\n\t" "push r17" "\n\t" "push r16" "\n\t" "push r15"); \
asm("push r14" "\n\t" "push r13" "\n\t" "push r12" "\n\t" "push r11" "\n\t" "push r10"); \
asm("push r9" "\n\t" "push r8" "\n\t" "push r7" "\n\t" "push r6" "\n\t" "push r5"); \
asm("push r4" "\n\t" "push r3" "\n\t" "push r2" "\n\t" "push r1" "\n\t" "push r0"); \
asm("in r0, __SREG__" "\n\t" "push r0"); \
sei(); \
} while (0)
#endif /* _AO_ARCH_H_ */
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