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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   512
  29
  30 #define AO_LED_TYPE     uint16_t
  31
  32 #ifndef AO_TICK_TYPE
  33 #define AO_TICK_TYPE    uint16_t
  34 #define AO_TICK_SIGNED  int16_t
  35 #endif
  36
  37 /* Various definitions to make GCC look more like SDCC */
  38
  39 #define ao_arch_naked_declare   __attribute__((naked))
  40 #define ao_arch_naked_define
  41 #define __pdata
  42 #define __data
  43 #define __xdata
  44 #define __code const
  45 #define __reentrant
  46 #define __interrupt(n)
  47 #define __at(n)
  48
  49 #define CORTEX_M3_AIRCR         ((uint32_t *) 0xe000ed0c)
  50
  51 #define ao_arch_reboot()        (*((uint32_t *) 0xe000ed0c) = 0x05fa0004)
  52
  53 #define ao_arch_nop()           asm("nop")
  54
  55 #define ao_arch_interrupt(n)    /* nothing */
  56
  57 #undef putchar
  58 #undef getchar
  59 #define putchar(c)      ao_putchar(c)
  60 #define getchar         ao_getchar
  61
  62 extern void putchar(char c);
  63 extern char getchar(void);
  64 extern void ao_avr_stdio_init(void);
  65
  66
  67 /*
  68  * ao_romconfig.c
  69  */
  70
  71 #define AO_ROMCONFIG_VERSION    2
  72
  73 #define AO_ROMCONFIG_SYMBOL(a) __attribute__((section(".romconfig"))) const
  74
  75 extern const uint16_t ao_romconfig_version;
  76 extern const uint16_t ao_romconfig_check;
  77 extern const uint16_t ao_serial_number;
  78 extern const uint32_t ao_radio_cal;
  79
  80 #define ARM_PUSH32(stack, val)  (*(--(stack)) = (val))
  81
  82 #define ao_arch_task_members\
  83         uint32_t *sp;                   /* saved stack pointer */
  84
  85 #define ao_arch_block_interrupts()      asm("cpsid i")
  86 #define ao_arch_release_interrupts()    asm("cpsie i")
  87
  88 #define cli()   ao_arch_block_interrupts()
  89 #define sei()   ao_arch_release_interrupts()
  90
  91 static uint32_t
  92 ao_arch_irqsave(void) {
  93         uint32_t        primask;
  94         asm("mrs %0,primask" : "=&r" (primask));
  95         ao_arch_block_interrupts();
  96         return primask;
  97 }
  98
  99 static void
 100 ao_arch_irqrestore(uint32_t primask) {
 101         asm("msr primask,%0" : : "r" (primask));
 102 }
 103
 104 static void
 105 ao_arch_memory_barrier() {
 106         asm volatile("" ::: "memory");
 107 }
 108
 109 #define ao_arch_init_stack(task, start) do {                            \
 110                 uint32_t        *sp = (uint32_t *) (task->stack + AO_STACK_SIZE); \
 111                 uint32_t        a = (uint32_t) start;                   \
 112                 int             i;                                      \
 113                                                                         \
 114                 /* Return address (goes into LR) */                     \
 115                 ARM_PUSH32(sp, a);                                      \
 116                                                                         \
 117                 /* Clear register values r0-r12 */                      \
 118                 i = 13;                                                 \
 119                 while (i--)                                             \
 120                         ARM_PUSH32(sp, 0);                              \
 121                                                                         \
 122                 /* APSR */                                              \
 123                 ARM_PUSH32(sp, 0);                                      \
 124                                                                         \
 125                 /* PRIMASK with interrupts enabled */                   \
 126                 ARM_PUSH32(sp, 0);                                      \
 127                                                                         \
 128                 task->sp = sp;                                          \
 129 } while (0);
 130
 131 #define ao_arch_save_regs()     do {                                    \
 132                 /* Save general registers */                            \
 133                 asm("push {r0-r12,lr}\n");                              \
 134                                                                         \
 135                 /* Save APSR */                                         \
 136                 asm("mrs r0,apsr");                                     \
 137                 asm("push {r0}");                                       \
 138                                                                         \
 139                 /* Save PRIMASK */                                      \
 140                 asm("mrs r0,primask");                                  \
 141                 asm("push {r0}");                                       \
 142                                                                         \
 143                 /* Enable interrupts */                                 \
 144                 sei();                                                  \
 145         } while (0)
 146
 147 #define ao_arch_save_stack() do {                                       \
 148                 uint32_t        *sp;                                    \
 149                 asm("mov %0,sp" : "=&r" (sp) );                         \
 150                 ao_cur_task->sp = (sp);                                 \
 151                 if ((uint8_t *) sp < &ao_cur_task->stack[0])            \
 152                         ao_panic (AO_PANIC_STACK);                      \
 153         } while (0)
 154
 155 #if 0
 156 #define ao_arch_isr_stack() do {                                \
 157                 uint32_t        *sp = (uint32_t *) 0x20004000;  \
 158                 asm("mov %0,sp" : "=&r" (sp) );                 \
 159         } while (0)
 160 #else
 161 #define ao_arch_isr_stack()
 162 #endif
 163
 164
 165 #define ao_arch_cpu_idle() do {                 \
 166                 asm(".global ao_idle_loc\n\twfi\nao_idle_loc:");        \
 167         } while (0)
 168
 169 #define ao_arch_restore_stack() do { \
 170                 uint32_t        sp;                                     \
 171                 sp = (uint32_t) ao_cur_task->sp;                        \
 172                                                                         \
 173                 /* Switch stacks */                                     \
 174                 asm("mov sp, %0" : : "r" (sp) );                        \
 175                                                                         \
 176                 /* Restore PRIMASK */                                   \
 177                 asm("pop {r0}");                                        \
 178                 asm("msr primask,r0");                                  \
 179                                                                         \
 180                 /* Restore APSR */                                      \
 181                 asm("pop {r0}");                                        \
 182                 asm("msr apsr,r0");                                     \
 183                                                                         \
 184                 /* Restore general registers */                         \
 185                 asm("pop {r0-r12,lr}\n");                               \
 186                                                                         \
 187                 /* Return to calling function */                        \
 188                 asm("bx lr");                                           \
 189         } while(0)
 190
 191 #define ao_arch_critical(b) do { cli(); do { b } while (0); sei(); } while (0)
 192
 193 /*
 194  * For now, we're running at a weird frequency
 195  */
 196
 197 #if AO_HSE
 198 #define AO_PLLSRC       AO_HSE
 199 #else
 200 #define AO_PLLSRC       STM_HSI_FREQ
 201 #endif
 202
 203 #define AO_PLLVCO       (AO_PLLSRC * AO_PLLMUL)
 204 #define AO_SYSCLK       (AO_PLLVCO / AO_PLLDIV)
 205 #define AO_HCLK         (AO_SYSCLK / AO_AHB_PRESCALER)
 206 #define AO_PCLK1        (AO_HCLK / AO_APB1_PRESCALER)
 207 #define AO_PCLK2        (AO_HCLK / AO_APB2_PRESCALER)
 208
 209 #if AO_APB1_PRESCALER == 1
 210 #define AO_TIM23467_CLK         AO_PCLK1
 211 #else
 212 #define AO_TIM23467_CLK         (2 * AO_PCLK1)
 213 #endif
 214
 215 #if AO_APB2_PRESCALER == 1
 216 #define AO_TIM91011_CLK         AO_PCLK2
 217 #else
 218 #define AO_TIM91011_CLK         (2 * AO_PCLK2)
 219 #endif
 220
 221 #define AO_STM_NVIC_HIGH_PRIORITY       4
 222 #define AO_STM_NVIC_CLOCK_PRIORITY      6
 223 #define AO_STM_NVIC_MED_PRIORITY        8
 224 #define AO_STM_NVIC_LOW_PRIORITY        10
 225
 226 void ao_lcd_stm_init(void);
 227
 228 void ao_lcd_font_init(void);
 229
 230 void ao_lcd_font_string(char *s);
 231
 232 char
 233 ao_serial1_getchar(void);
 234
 235 void
 236 ao_serial1_putchar(char c);
 237
 238 char
 239 ao_serial1_pollchar(void);
 240
 241 void
 242 ao_serial1_set_speed(uint8_t speed);
 243
 244 char
 245 ao_serial2_getchar(void);
 246
 247 void
 248 ao_serial2_putchar(char c);
 249
 250 char
 251 ao_serial2_pollchar(void);
 252
 253 void
 254 ao_serial2_set_speed(uint8_t speed);
 255
 256 char
 257 ao_serial3_getchar(void);
 258
 259 void
 260 ao_serial3_putchar(char c);
 261
 262 char
 263 ao_serial3_pollchar(void);
 264
 265 void
 266 ao_serial3_set_speed(uint8_t speed);
 267
 268 extern const uint32_t   ao_radio_cal;
 269
 270 void
 271 ao_adc_init();
 272
 273 #endif /* _AO_ARCH_H_ */
 274