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   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   1024
  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                 uint32_t        a = (uint32_t) start;                   \
  71                 int             i;                                      \
  72                                                                         \
  73                 /* APSR */                                              \
  74                 ARM_PUSH32(sp, 0);                                      \
  75                                                                         \
  76                 /* PRIMASK with interrupts enabled */                   \
  77                 ARM_PUSH32(sp, 0);                                      \
  78                                                                         \
  79                 /* Return address (goes into LR) */                     \
  80                 ARM_PUSH32(sp, a);                                      \
  81                                                                         \
  82                 /* Clear register values r0-r12 */                      \
  83                 i = 13;                                                 \
  84                 while (i--)                                             \
  85                         ARM_PUSH32(sp, 0);                              \
  86                                                                         \
  87                 task->sp = sp;                                          \
  88 } while (0);
  89
  90 #define ao_arch_save_regs()     do {                                    \
  91                 uint32_t        apsr;                                   \
  92                 uint32_t        primask;                                \
  93                                                                         \
  94                 /* Save APSR */                                         \
  95                 asm("mrs %0,apsr" : "=&r" (apsr));                      \
  96                 asm("push {%0}" : : "r" (apsr));                        \
  97                                                                         \
  98                 /* Save PRIMASK */                                      \
  99                 asm("mrs %0,primask" : "=&r" (primask));                \
 100                 asm("push {%0}" : : "r" (primask));                     \
 101                                                                         \
 102                 /* Save general registers */                            \
 103                 asm("push {r0-r12,lr}\n");                              \
 104         } while (0)
 105
 106 #define ao_arch_save_stack() do {                                       \
 107                 uint32_t        *sp;                                    \
 108                 asm("mov %0,sp" : "=&r" (sp) );                         \
 109                 ao_cur_task->sp = (sp);                                 \
 110                 if ((uint8_t *) sp < ao_cur_task->stack)                \
 111                         ao_panic (AO_PANIC_STACK);                      \
 112         } while (0)
 113
 114 #define ao_arch_isr_stack()     /* nothing */
 115
 116 #define ao_arch_cpu_idle() do {                 \
 117                 asm("wfi");                     \
 118         } while (0)
 119
 120 #define ao_arch_restore_stack() do { \
 121                 uint32_t        sp;                                     \
 122                 uint32_t        primask;                                \
 123                 uint32_t        apsr;                                   \
 124                 sp = (uint32_t) ao_cur_task->sp;                        \
 125                                                                         \
 126                 /* Switch stacks */                                     \
 127                 asm("mov sp, %0" : : "r" (sp) );                        \
 128                                                                         \
 129                 /* Restore general registers */                         \
 130                 asm("pop {r0-r12,lr}\n");                               \
 131                                                                         \
 132                 /* Restore PRIMASK */                                   \
 133                 asm("pop {%0}" : "=&r" (primask) );                     \
 134                 asm("msr primask,%0" : : "r" (primask) );               \
 135                                                                         \
 136                 /* Restore APSR */                                      \
 137                 asm("pop {%0}" : "=&r" (apsr) );                        \
 138                 asm("msr apsr,%0" : : "r" (apsr) );                     \
 139                                                                         \
 140                 /* Return to calling function */                        \
 141                 asm("bx lr");                                           \
 142         } while(0)
 143
 144 #define ao_arch_critical(b) do { cli(); do { b } while (0); sei(); } while (0)
 145
 146 #define AO_ARM_NUM_ADC  12
 147
 148 struct ao_adc {
 149         uint16_t        tick;                   /* tick when the sample was read */
 150         uint16_t        adc[AO_ARM_NUM_ADC];    /* samples */
 151 };
 152
 153 /*
 154  * For now, we're running at a weird frequency
 155  */
 156 #define STM_APB1        (16000000 * 6 / 4)
 157
 158 void ao_lcd_stm_init(void);
 159
 160 void ao_lcd_font_init(void);
 161
 162 void ao_lcd_font_string(char *s);
 163
 164 #endif /* _AO_ARCH_H_ */
 165