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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 #define AO_LED_TYPE     uint16_t
  31
  32 /* Various definitions to make GCC look more like SDCC */
  33
  34 #define ao_arch_naked_declare   __attribute__((naked))
  35 #define ao_arch_naked_define
  36 #define __pdata
  37 #define __data
  38 #define __xdata
  39 #define __code const
  40 #define __reentrant
  41 #define __critical
  42 #define __interrupt(n)
  43 #define __at(n)
  44
  45 #define ao_arch_reboot()        /* XXX */
  46
  47 #define ao_arch_nop()           asm("nop")
  48
  49 #define ao_arch_interrupt(n)    /* nothing */
  50
  51 #undef putchar
  52 #undef getchar
  53 #define putchar(c)      ao_putchar(c)
  54 #define getchar         ao_getchar
  55
  56 extern void putchar(char c);
  57 extern char getchar(void);
  58 extern void ao_avr_stdio_init(void);
  59
  60 extern const uint16_t ao_serial_number;
  61
  62 #define ARM_PUSH32(stack, val)  (*(--(stack)) = (val))
  63
  64 #define ao_arch_task_members\
  65         uint32_t *sp;                   /* saved stack pointer */
  66
  67 #define cli()   asm("cpsid i")
  68 #define sei()   asm("cpsie i")
  69
  70 #define ao_arch_init_stack(task, start) do {                            \
  71                 uint32_t        *sp = (uint32_t *) (task->stack + AO_STACK_SIZE); \
  72                 uint32_t        a = (uint32_t) start;                   \
  73                 int             i;                                      \
  74                                                                         \
  75                 /* APSR */                                              \
  76                 ARM_PUSH32(sp, 0);                                      \
  77                                                                         \
  78                 /* PRIMASK with interrupts enabled */                   \
  79                 ARM_PUSH32(sp, 0);                                      \
  80                                                                         \
  81                 /* Return address (goes into LR) */                     \
  82                 ARM_PUSH32(sp, a);                                      \
  83                                                                         \
  84                 /* Clear register values r0-r12 */                      \
  85                 i = 13;                                                 \
  86                 while (i--)                                             \
  87                         ARM_PUSH32(sp, 0);                              \
  88                                                                         \
  89                 task->sp = sp;                                          \
  90 } while (0);
  91
  92 #define ao_arch_save_regs()     do {                                    \
  93                 uint32_t        apsr;                                   \
  94                 uint32_t        primask;                                \
  95                                                                         \
  96                 /* Save APSR */                                         \
  97                 asm("mrs %0,apsr" : "=&r" (apsr));                      \
  98                 asm("push {%0}" : : "r" (apsr));                        \
  99                                                                         \
 100                 /* Save PRIMASK */                                      \
 101                 asm("mrs %0,primask" : "=&r" (primask));                \
 102                 asm("push {%0}" : : "r" (primask));                     \
 103                                                                         \
 104                 /* Save general registers */                            \
 105                 asm("push {r0-r12,lr}\n");                              \
 106         } while (0)
 107
 108 #define ao_arch_save_stack() do {                                       \
 109                 uint32_t        *sp;                                    \
 110                 asm("mov %0,sp" : "=&r" (sp) );                         \
 111                 ao_cur_task->sp = (sp);                                 \
 112                 if ((uint8_t *) sp < ao_cur_task->stack)                \
 113                         ao_panic (AO_PANIC_STACK);                      \
 114         } while (0)
 115
 116 #define ao_arch_isr_stack()     /* nothing */
 117
 118 #define ao_arch_cpu_idle() do {                 \
 119                 asm("wfi");                     \
 120         } while (0)
 121
 122 #define ao_arch_restore_stack() do { \
 123                 uint32_t        sp;                                     \
 124                 uint32_t        primask;                                \
 125                 uint32_t        apsr;                                   \
 126                 sp = (uint32_t) ao_cur_task->sp;                        \
 127                                                                         \
 128                 /* Switch stacks */                                     \
 129                 asm("mov sp, %0" : : "r" (sp) );                        \
 130                                                                         \
 131                 /* Restore general registers */                         \
 132                 asm("pop {r0-r12,lr}\n");                               \
 133                                                                         \
 134                 /* Restore PRIMASK */                                   \
 135                 asm("pop {%0}" : "=&r" (primask) );                     \
 136                 asm("msr primask,%0" : : "r" (primask) );               \
 137                                                                         \
 138                 /* Restore APSR */                                      \
 139                 asm("pop {%0}" : "=&r" (apsr) );                        \
 140                 asm("msr apsr,%0" : : "r" (apsr) );                     \
 141                                                                         \
 142                 /* Return to calling function */                        \
 143                 asm("bx lr");                                           \
 144         } while(0)
 145
 146 #define ao_arch_critical(b) do { cli(); do { b } while (0); sei(); } while (0)
 147
 148 /*
 149  * For now, we're running at a weird frequency
 150  */
 151 #define STM_APB1        (16000000 * 6 / 4)
 152
 153 void ao_lcd_stm_init(void);
 154
 155 void ao_lcd_font_init(void);
 156
 157 void ao_lcd_font_string(char *s);
 158
 159 #define USE_SERIAL_STDIN        (USE_SERIAL_1_STDIN + USE_SERIAL_2_STDIN + USE_SERIAL_3_STDIN)
 160
 161 char
 162 ao_serial1_getchar(void);
 163
 164 void
 165 ao_serial1_putchar(char c);
 166
 167 char
 168 ao_serial1_pollchar(void);
 169
 170 void
 171 ao_serial1_set_speed(uint8_t speed);
 172
 173 char
 174 ao_serial2_getchar(void);
 175
 176 void
 177 ao_serial2_putchar(char c);
 178
 179 char
 180 ao_serial2_pollchar(void);
 181
 182 void
 183 ao_serial2_set_speed(uint8_t speed);
 184
 185 char
 186 ao_serial3_getchar(void);
 187
 188 void
 189 ao_serial3_putchar(char c);
 190
 191 char
 192 ao_serial3_pollchar(void);
 193
 194 void
 195 ao_serial3_set_speed(uint8_t speed);
 196
 197 extern uint32_t ao_radio_cal;
 198
 199 void
 200 ao_adc_init();
 201
 202 #endif /* _AO_ARCH_H_ */
 203