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   1 /*
   2  * Copyright © 2011 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 #ifndef _AO_ARCH_H_
  19 #define _AO_ARCH_H_
  20
  21 #include <avr/io.h>
  22 #include <avr/interrupt.h>
  23
  24 #ifdef AVR_DEMO
  25 #define TEENSY 1
  26 #endif
  27
  28 #if TEENSY
  29 #define F_CPU 16000000UL        // 16 MHz
  30 #else
  31 #define F_CPU  8000000UL        // 8 MHz
  32 #endif
  33
  34 /*
  35  * AVR definitions and code fragments for AltOS
  36  */
  37
  38 #define AO_STACK_SIZE   128
  39
  40 /* Various definitions to make GCC look more like SDCC */
  41
  42 #define ao_arch_naked_declare   __attribute__((naked))
  43 #define ao_arch_naked_define
  44 #define __pdata
  45 #define __data
  46 #define __xdata
  47 #define __code const
  48 #define __reentrant
  49 #define __critical
  50 #define __interrupt(n)
  51
  52 #define ao_arch_reboot()        /* XXX */
  53
  54 #define ao_arch_nop()           asm("nop")
  55
  56 #define ao_arch_interrupt(n)    /* nothing */
  57
  58 #undef putchar
  59 #undef getchar
  60 #define putchar(c)      ao_putchar(c)
  61 #define getchar         ao_getchar
  62
  63 extern void putchar(char c);
  64 extern char getchar(void);
  65
  66 extern int ao_serial_number;
  67
  68 #define ao_arch_init_stack(task, start) do {                    \
  69         uint8_t         *sp = task->stack + AO_STACK_SIZE - 1;  \
  70         uint16_t        a = (uint16_t) start;                   \
  71         int             i;                                      \
  72                                                                 \
  73         /* Return address */                                    \
  74         PUSH8(sp, a);                                           \
  75         PUSH8(sp, (a >> 8));                                    \
  76                                                                 \
  77         /* Clear register values */                             \
  78         i = 32;                                                 \
  79         while (i--)                                             \
  80                 PUSH8(sp, 0);                                   \
  81                                                                 \
  82         /* SREG with interrupts enabled */                      \
  83         PUSH8(sp, 0x80);                                        \
  84         task->sp = sp;                                          \
  85 } while (0);
  86
  87 #define ao_arch_save_context() do {                     \
  88         asm("push r31" "\n\t" "push r30"); \
  89         asm("push r29" "\n\t" "push r28" "\n\t" "push r27" "\n\t" "push r26" "\n\t" "push r25"); \
  90         asm("push r24" "\n\t" "push r23" "\n\t" "push r22" "\n\t" "push r21" "\n\t" "push r20"); \
  91         asm("push r19" "\n\t" "push r18" "\n\t" "push r17" "\n\t" "push r16" "\n\t" "push r15"); \
  92         asm("push r14" "\n\t" "push r13" "\n\t" "push r12" "\n\t" "push r11" "\n\t" "push r10"); \
  93         asm("push r9" "\n\t" "push r8" "\n\t" "push r7" "\n\t" "push r6" "\n\t" "push r5"); \
  94         asm("push r4" "\n\t" "push r3" "\n\t" "push r2" "\n\t" "push r1" "\n\t" "push r0"); \
  95         asm("in r0, __SREG__" "\n\t" "push r0"); \
  96         sei(); \
  97         } while (0)
  98
  99 #endif /* _AO_ARCH_H_ */