git.gag.com Git - fw/altos/blob - src/stm/ao_arch.h

   1 /*
   2  * Copyright © 2012 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 <stm32l.h>
  23
  24 /*
  25  * STM32L definitions and code fragments for AltOS
  26  */
  27
  28 #define AO_STACK_SIZE   256
  29
  30 /* Various definitions to make GCC look more like SDCC */
  31
  32 #define ao_arch_naked_declare   __attribute__((naked))
  33 #define ao_arch_naked_define
  34 #define __pdata
  35 #define __data
  36 #define __xdata
  37 #define __code const
  38 #define __reentrant
  39 #define __critical
  40 #define __interrupt(n)
  41 #define __at(n)
  42
  43 #define ao_arch_reboot()        /* XXX */
  44
  45 #define ao_arch_nop()           asm("nop")
  46
  47 #define ao_arch_interrupt(n)    /* nothing */
  48
  49 #undef putchar
  50 #undef getchar
  51 #define putchar(c)      ao_putchar(c)
  52 #define getchar         ao_getchar
  53
  54 extern void putchar(char c);
  55 extern char getchar(void);
  56 extern void ao_avr_stdio_init(void);
  57
  58 extern const uint16_t ao_serial_number;
  59
  60 #define ARM_PUSH32(stack, val)  (*(--(stack)) = (val))
  61
  62 #define ao_arch_task_members\
  63         uint32_t *sp;                   /* saved stack pointer */
  64
  65 #define cli()   asm("cpsid i")
  66 #define sei()   asm("cpsie i")
  67
  68 #define ao_arch_init_stack(task, start) do {                            \
  69                 uint32_t        *sp = (uint32_t *) (task->stack + AO_STACK_SIZE); \
  70                 uint16_t        a = (uint16_t) start;                   \
  71                 int             i;                                      \
  72                                                                         \
  73                 /* Return address */                                    \
  74                 ARM_PUSH32(sp, a);                                      \
  75                                                                         \
  76                 /* Invalid link register */                             \
  77                 ARM_PUSH32(sp, 0xffffffff);                             \
  78                                                                         \
  79                 /* Clear register values  */                            \
  80                 i = 13;                                                 \
  81                 while (i--)                                             \
  82                         ARM_PUSH32(sp, 0);                              \
  83                                                                         \
  84                 /* PSR with interrupts enabled */                       \
  85                 ARM_PUSH32(sp, 0x01000000);                             \
  86                 task->sp = sp;                                          \
  87 } while (0);
  88
  89 #define ao_arch_save_regs() do {                                        \
  90                 asm("push {r0-r12,lr}\n");                              \
  91                 cli();                                                  \
  92                 asm("mrs r0,psr" "\n\t" "push {r0}");                   \
  93                 sei();                                                  \
  94         } while (0)
  95
  96 #define ao_arch_save_stack() do {                                       \
  97                 uint32_t        sp;                                     \
  98                 asm("mov %0,sp" : "=&r" (sp) );                         \
  99                 ao_cur_task->sp = (uint32_t *) (sp);                    \
 100         } while (0)
 101
 102 #define ao_arch_isr_stack()     /* nothing */
 103
 104 #define ao_arch_cpu_idle() do {                 \
 105                 asm("wfi");                     \
 106         } while (0)
 107
 108 #define ao_arch_restore_stack() do { \
 109                 uint32_t        sp;                                     \
 110                 sp = (uint32_t) ao_cur_task->sp;                        \
 111                 cli();                                                  \
 112                 asm("mov sp, %0" : : "r" (sp) );                        \
 113                 asm("pop {r0}" "\n\t" "msr psr,r0");                    \
 114                 asm("pop {r0-r12,lr}\n");                               \
 115                 asm("bx lr");                                           \
 116         } while(0)
 117
 118 #define ao_arch_critical(b) do { cli(); do { b } while (0); sei(); } while (0)
 119
 120 #define AO_ARM_NUM_ADC  12
 121
 122 struct ao_adc {
 123         uint16_t        tick;                   /* tick when the sample was read */
 124         uint16_t        adc[AO_ARM_NUM_ADC];    /* samples */
 125 };
 126
 127 /*
 128  * For now, we're running at a weird frequency
 129  */
 130 #define STM_APB1        (16000000 * 6 / 4)
 131
 132 #endif /* _AO_ARCH_H_ */
 133