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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 <stdio.h>
  22 #include <avr/io.h>
  23 #include <avr/interrupt.h>
  24 #include <avr/sleep.h>
  25
  26 #ifdef AVR_DEMO
  27 #define TEENSY 1
  28 #endif
  29
  30 #if TEENSY
  31 #define F_CPU 16000000UL        // 16 MHz
  32 #else
  33 #define F_CPU  8000000UL        // 8 MHz
  34 #endif
  35
  36 /*
  37  * AVR definitions and code fragments for AltOS
  38  */
  39
  40 #ifndef AO_STACK_SIZE
  41 #define AO_STACK_SIZE   116
  42 #endif
  43
  44 #define AO_PORT_TYPE    uint8_t
  45
  46 /* Various definitions to make GCC look more like SDCC */
  47
  48 #define ao_arch_naked_declare   __attribute__((naked))
  49 #define ao_arch_naked_define
  50 #define __pdata
  51 #define __data
  52 #define __xdata
  53 #define __code const
  54 #define __reentrant
  55 #define __critical
  56 #define __interrupt(n)
  57 #define __at(n)
  58
  59 #define ao_arch_reboot()        /* XXX */
  60
  61 #define ao_arch_nop()           asm("nop")
  62
  63 #define ao_arch_interrupt(n)    /* nothing */
  64
  65 #undef putchar
  66 #undef getchar
  67 #define putchar(c)      ao_putchar(c)
  68 #define getchar         ao_getchar
  69
  70 extern void putchar(char c);
  71 extern char getchar(void);
  72 extern void ao_avr_stdio_init(void);
  73
  74 #define AO_ROMCONFIG_VERSION    2
  75
  76 #define AO_ROMCONFIG_SYMBOL(a) const
  77
  78 extern AO_ROMCONFIG_SYMBOL(0) uint16_t ao_serial_number;
  79
  80 #define AVR_PUSH8(stack, val)   (*((stack)--) = (val))
  81
  82 extern uint8_t  ao_cpu_sleep_disable;
  83
  84 #define ao_arch_task_globals    uint8_t ao_cpu_sleep_disable;
  85
  86 #define ao_arch_task_members\
  87         uint8_t *sp;                    /* saved stack pointer */
  88
  89 #define ao_arch_init_stack(task, start) do {                    \
  90         uint8_t         *sp = task->stack + AO_STACK_SIZE - 1;  \
  91         uint16_t        a = (uint16_t) start;                   \
  92         int             i;                                      \
  93                                                                 \
  94         /* Return address */                                    \
  95         AVR_PUSH8(sp, a);                                       \
  96         AVR_PUSH8(sp, (a >> 8));                                \
  97                                                                 \
  98         /* Clear register values */                             \
  99         i = 32;                                                 \
 100         while (i--)                                             \
 101                 AVR_PUSH8(sp, 0);                               \
 102                                                                 \
 103         /* SREG with interrupts enabled */                      \
 104         AVR_PUSH8(sp, 0x80);                                    \
 105         task->sp = sp;                                          \
 106 } while (0);
 107
 108 #define ao_arch_save_regs() do {                                        \
 109                 asm("push r31" "\n\t" "push r30");                      \
 110                 asm("push r29" "\n\t" "push r28" "\n\t" "push r27" "\n\t" "push r26" "\n\t" "push r25"); \
 111                 asm("push r24" "\n\t" "push r23" "\n\t" "push r22" "\n\t" "push r21" "\n\t" "push r20"); \
 112                 asm("push r19" "\n\t" "push r18" "\n\t" "push r17" "\n\t" "push r16" "\n\t" "push r15"); \
 113                 asm("push r14" "\n\t" "push r13" "\n\t" "push r12" "\n\t" "push r11" "\n\t" "push r10"); \
 114                 asm("push r9" "\n\t" "push r8" "\n\t" "push r7" "\n\t" "push r6" "\n\t" "push r5"); \
 115                 asm("push r4" "\n\t" "push r3" "\n\t" "push r2" "\n\t" "push r1" "\n\t" "push r0"); \
 116                 asm("in r0, __SREG__" "\n\t" "push r0");                \
 117         } while (0)
 118
 119 #define ao_arch_save_stack() do {                                       \
 120                 uint8_t sp_l, sp_h;                                     \
 121                 asm("in %0,__SP_L__" : "=&r" (sp_l) );                  \
 122                 asm("in %0,__SP_H__" : "=&r" (sp_h) );                  \
 123                 ao_cur_task->sp = (uint8_t *) ((uint16_t) sp_l | ((uint16_t) sp_h << 8)); \
 124         } while (0)
 125
 126 #define ao_arch_isr_stack()     /* nothing */
 127
 128 /* Idle the CPU (if possible) waiting for an interrupt. Enabling
 129  * interrupts and sleeping the CPU must be adjacent to eliminate race
 130  * conditions. In all cases, we execute a single nop with interrupts
 131  * enabled
 132  */
 133 #define ao_arch_wait_interrupt() do {           \
 134                 if (!ao_cpu_sleep_disable) {    \
 135                         sleep_enable();         \
 136                         sei();                  \
 137                         sleep_cpu();            \
 138                         sleep_disable();        \
 139                 } else {                        \
 140                         sei();                  \
 141                 }                               \
 142                 ao_arch_nop();                  \
 143                 cli();                          \
 144         } while (0)
 145
 146 #define ao_arch_restore_stack() do { \
 147                 uint8_t sp_l, sp_h;                                     \
 148                 sp_l = (uint16_t) ao_cur_task->sp;                      \
 149                 sp_h = ((uint16_t) ao_cur_task->sp) >> 8;               \
 150                 asm("out __SP_H__,%0" : : "r" (sp_h) );                 \
 151                 asm("out __SP_L__,%0" : : "r" (sp_l) );                 \
 152                 asm("pop r0"    "\n\t"                                  \
 153                     "out __SREG__, r0");                                \
 154                 asm("pop r0" "\n\t" "pop r1" "\n\t" "pop r2" "\n\t" "pop r3" "\n\t" "pop r4"); \
 155                 asm("pop r5" "\n\t" "pop r6" "\n\t" "pop r7" "\n\t" "pop r8" "\n\t" "pop r9"); \
 156                 asm("pop r10" "\n\t" "pop r11" "\n\t" "pop r12" "\n\t" "pop r13" "\n\t" "pop r14"); \
 157                 asm("pop r15" "\n\t" "pop r16" "\n\t" "pop r17" "\n\t" "pop r18" "\n\t" "pop r19"); \
 158                 asm("pop r20" "\n\t" "pop r21" "\n\t" "pop r22" "\n\t" "pop r23" "\n\t" "pop r24"); \
 159                 asm("pop r25" "\n\t" "pop r26" "\n\t" "pop r27" "\n\t" "pop r28" "\n\t" "pop r29"); \
 160                 asm("pop r30" "\n\t" "pop r31");                        \
 161                 asm("ret");                                             \
 162         } while(0)
 163
 164 #define ao_arch_critical(b) do { cli(); do { b } while (0); sei(); } while (0)
 165
 166 #define ao_arch_block_interrupts()      cli()
 167 #define ao_arch_release_interrupts()    sei()
 168
 169 #define AO_TELESCIENCE_NUM_ADC  12
 170
 171 #endif /* _AO_ARCH_H_ */
 172