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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; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #ifndef _AO_ARCH_H_
  20 #define _AO_ARCH_H_
  21
  22 #include <stdio.h>
  23 #include <avr/io.h>
  24 #include <avr/interrupt.h>
  25 #include <avr/sleep.h>
  26
  27 #ifdef AVR_DEMO
  28 #define TEENSY 1
  29 #endif
  30
  31 #if TEENSY
  32 #define F_CPU 16000000UL        // 16 MHz
  33 #else
  34 #define F_CPU  8000000UL        // 8 MHz
  35 #endif
  36
  37 /*
  38  * AVR definitions and code fragments for AltOS
  39  */
  40
  41 #ifndef AO_STACK_SIZE
  42 #define AO_STACK_SIZE   116
  43 #endif
  44
  45 #define AO_PORT_TYPE    uint8_t
  46
  47 /* Various definitions to make GCC look more like SDCC */
  48
  49 #define ao_arch_naked_declare   __attribute__((naked))
  50 #define ao_arch_naked_define
  51 #define __interrupt(n)
  52 #define __at(n)
  53
  54 #define ao_arch_reboot()        /* XXX */
  55
  56 #define ao_arch_nop()           asm("nop")
  57
  58 #define ao_arch_interrupt(n)    /* nothing */
  59
  60 #undef putchar
  61 #undef getchar
  62 #define putchar(c)      ao_putchar(c)
  63 #define getchar         ao_getchar
  64
  65 extern void putchar(char c);
  66 extern char getchar(void);
  67 extern void ao_avr_stdio_init(void);
  68
  69 #define AO_ROMCONFIG_VERSION    2
  70
  71 #define AO_ROMCONFIG_SYMBOL(a) const
  72
  73 extern AO_ROMCONFIG_SYMBOL(0) uint16_t ao_serial_number;
  74
  75 #define AVR_PUSH8(stack, val)   (*((stack)--) = (val))
  76
  77 extern uint8_t  ao_cpu_sleep_disable;
  78
  79 #define ao_arch_task_globals    uint8_t ao_cpu_sleep_disable;
  80
  81 #define ao_arch_task_members\
  82         uint8_t *sp;                    /* saved stack pointer */
  83
  84 #define ao_arch_init_stack(task, start) do {                    \
  85         uint8_t         *sp = task->stack + AO_STACK_SIZE - 1;  \
  86         uint16_t        a = (uint16_t) start;                   \
  87         int             i;                                      \
  88                                                                 \
  89         /* Return address */                                    \
  90         AVR_PUSH8(sp, a);                                       \
  91         AVR_PUSH8(sp, (a >> 8));                                \
  92                                                                 \
  93         /* Clear register values */                             \
  94         i = 32;                                                 \
  95         while (i--)                                             \
  96                 AVR_PUSH8(sp, 0);                               \
  97                                                                 \
  98         /* SREG with interrupts enabled */                      \
  99         AVR_PUSH8(sp, 0x80);                                    \
 100         task->sp = sp;                                          \
 101 } while (0);
 102
 103 #define ao_arch_save_regs() do {                                        \
 104                 asm("push r31" "\n\t" "push r30");                      \
 105                 asm("push r29" "\n\t" "push r28" "\n\t" "push r27" "\n\t" "push r26" "\n\t" "push r25"); \
 106                 asm("push r24" "\n\t" "push r23" "\n\t" "push r22" "\n\t" "push r21" "\n\t" "push r20"); \
 107                 asm("push r19" "\n\t" "push r18" "\n\t" "push r17" "\n\t" "push r16" "\n\t" "push r15"); \
 108                 asm("push r14" "\n\t" "push r13" "\n\t" "push r12" "\n\t" "push r11" "\n\t" "push r10"); \
 109                 asm("push r9" "\n\t" "push r8" "\n\t" "push r7" "\n\t" "push r6" "\n\t" "push r5"); \
 110                 asm("push r4" "\n\t" "push r3" "\n\t" "push r2" "\n\t" "push r1" "\n\t" "push r0"); \
 111                 asm("in r0, __SREG__" "\n\t" "push r0");                \
 112         } while (0)
 113
 114 #define ao_arch_save_stack() do {                                       \
 115                 uint8_t sp_l, sp_h;                                     \
 116                 asm("in %0,__SP_L__" : "=&r" (sp_l) );                  \
 117                 asm("in %0,__SP_H__" : "=&r" (sp_h) );                  \
 118                 ao_cur_task->sp = (uint8_t *) ((uint16_t) sp_l | ((uint16_t) sp_h << 8)); \
 119         } while (0)
 120
 121 #define ao_arch_isr_stack()     /* nothing */
 122
 123 /* Idle the CPU (if possible) waiting for an interrupt. Enabling
 124  * interrupts and sleeping the CPU must be adjacent to eliminate race
 125  * conditions. In all cases, we execute a single nop with interrupts
 126  * enabled
 127  */
 128 #define ao_arch_wait_interrupt() do {           \
 129                 if (!ao_cpu_sleep_disable) {    \
 130                         sleep_enable();         \
 131                         sei();                  \
 132                         sleep_cpu();            \
 133                         sleep_disable();        \
 134                 } else {                        \
 135                         sei();                  \
 136                 }                               \
 137                 ao_arch_nop();                  \
 138                 cli();                          \
 139         } while (0)
 140
 141 #define ao_arch_restore_stack() do { \
 142                 uint8_t sp_l, sp_h;                                     \
 143                 sp_l = (uint16_t) ao_cur_task->sp;                      \
 144                 sp_h = ((uint16_t) ao_cur_task->sp) >> 8;               \
 145                 asm("out __SP_H__,%0" : : "r" (sp_h) );                 \
 146                 asm("out __SP_L__,%0" : : "r" (sp_l) );                 \
 147                 asm("pop r0"    "\n\t"                                  \
 148                     "out __SREG__, r0");                                \
 149                 asm("pop r0" "\n\t" "pop r1" "\n\t" "pop r2" "\n\t" "pop r3" "\n\t" "pop r4"); \
 150                 asm("pop r5" "\n\t" "pop r6" "\n\t" "pop r7" "\n\t" "pop r8" "\n\t" "pop r9"); \
 151                 asm("pop r10" "\n\t" "pop r11" "\n\t" "pop r12" "\n\t" "pop r13" "\n\t" "pop r14"); \
 152                 asm("pop r15" "\n\t" "pop r16" "\n\t" "pop r17" "\n\t" "pop r18" "\n\t" "pop r19"); \
 153                 asm("pop r20" "\n\t" "pop r21" "\n\t" "pop r22" "\n\t" "pop r23" "\n\t" "pop r24"); \
 154                 asm("pop r25" "\n\t" "pop r26" "\n\t" "pop r27" "\n\t" "pop r28" "\n\t" "pop r29"); \
 155                 asm("pop r30" "\n\t" "pop r31");                        \
 156                 asm("ret");                                             \
 157         } while(0)
 158
 159 #define ao_arch_critical(b) do { cli(); do { b } while (0); sei(); } while (0)
 160
 161 #define ao_arch_block_interrupts()      cli()
 162 #define ao_arch_release_interrupts()    sei()
 163
 164 #define AO_TELESCIENCE_NUM_ADC  12
 165
 166 #endif /* _AO_ARCH_H_ */
 167