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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 CORTEX_M3_AIRCR         ((uint32_t *) 0xe000ed0c)
  46
  47 #define ao_arch_reboot()        (*((uint32_t *) 0xe000ed0c) = 0x05fa0004)
  48
  49 #define ao_arch_nop()           asm("nop")
  50
  51 #define ao_arch_interrupt(n)    /* nothing */
  52
  53 #undef putchar
  54 #undef getchar
  55 #define putchar(c)      ao_putchar(c)
  56 #define getchar         ao_getchar
  57
  58 extern void putchar(char c);
  59 extern char getchar(void);
  60 extern void ao_avr_stdio_init(void);
  61
  62 extern const uint16_t ao_serial_number;
  63
  64 #define ARM_PUSH32(stack, val)  (*(--(stack)) = (val))
  65
  66 #define ao_arch_task_members\
  67         uint32_t *sp;                   /* saved stack pointer */
  68
  69 #define cli()   asm("cpsid i")
  70 #define sei()   asm("cpsie i")
  71
  72 #define ao_arch_init_stack(task, start) do {                            \
  73                 uint32_t        *sp = (uint32_t *) (task->stack + AO_STACK_SIZE); \
  74                 uint32_t        a = (uint32_t) start;                   \
  75                 int             i;                                      \
  76                                                                         \
  77                 /* Return address (goes into LR) */                     \
  78                 ARM_PUSH32(sp, a);                                      \
  79                                                                         \
  80                 /* Clear register values r0-r12 */                      \
  81                 i = 13;                                                 \
  82                 while (i--)                                             \
  83                         ARM_PUSH32(sp, 0);                              \
  84                                                                         \
  85                 /* APSR */                                              \
  86                 ARM_PUSH32(sp, 0);                                      \
  87                                                                         \
  88                 /* PRIMASK with interrupts enabled */                   \
  89                 ARM_PUSH32(sp, 0);                                      \
  90                                                                         \
  91                 task->sp = sp;                                          \
  92 } while (0);
  93
  94 #define ao_arch_save_regs()     do {                                    \
  95                 /* Save general registers */                            \
  96                 asm("push {r0-r12,lr}\n");                              \
  97                                                                         \
  98                 /* Save APSR */                                         \
  99                 asm("mrs r0,apsr");                                     \
 100                 asm("push {r0}");                                       \
 101                                                                         \
 102                 /* Save PRIMASK */                                      \
 103                 asm("mrs r0,primask");                                  \
 104                 asm("push {r0}");                                       \
 105                                                                         \
 106                 /* Enable interrupts */                                 \
 107                 sei();                                                  \
 108         } while (0)
 109
 110 #define ao_arch_save_stack() do {                                       \
 111                 uint32_t        *sp;                                    \
 112                 asm("mov %0,sp" : "=&r" (sp) );                         \
 113                 ao_cur_task->sp = (sp);                                 \
 114                 if ((uint8_t *) sp < ao_cur_task->stack)                \
 115                         ao_panic (AO_PANIC_STACK);                      \
 116         } while (0)
 117
 118 #define ao_arch_isr_stack()     /* nothing */
 119
 120 #define ao_arch_cpu_idle() do {                 \
 121                 asm("wfi");                     \
 122         } while (0)
 123
 124 #define ao_arch_restore_stack() do { \
 125                 uint32_t        sp;                                     \
 126                 sp = (uint32_t) ao_cur_task->sp;                        \
 127                                                                         \
 128                 /* Switch stacks */                                     \
 129                 asm("mov sp, %0" : : "r" (sp) );                        \
 130                                                                         \
 131                 /* Restore PRIMASK */                                   \
 132                 asm("pop {r0}");                                        \
 133                 asm("msr primask,r0");                                  \
 134                                                                         \
 135                 /* Restore APSR */                                      \
 136                 asm("pop {r0}");                                        \
 137                 asm("msr apsr,r0");                                     \
 138                                                                         \
 139                 /* Restore general registers */                         \
 140                 asm("pop {r0-r12,lr}\n");                               \
 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
 152 #if AO_HSE
 153 #define AO_PLLSRC       AO_HSE
 154 #else
 155 #define AO_PLLSRC       STM_HSI_FREQ
 156 #endif
 157
 158 #define AO_PLLVCO       (AO_PLLSRC * AO_PLLMUL)
 159 #define AO_SYSCLK       (AO_PLLVCO / AO_PLLDIV)
 160 #define AO_HCLK         (AO_SYSCLK / AO_AHB_PRESCALER)
 161 #define AO_PCLK1        (AO_HCLK / AO_APB1_PRESCALER)
 162 #define AO_PCLK2        (AO_HCLK / AO_APB2_PRESCALER)
 163
 164 #if AO_APB1_PRESCALER == 1
 165 #define AO_TIM23467_CLK         AO_PCLK1
 166 #else
 167 #define AO_TIM23467_CLK         (2 * AO_PCLK1)
 168 #endif
 169
 170 #if AO_APB2_PRESCALER == 1
 171 #define AO_TIM91011_CLK         AO_PCLK2
 172 #else
 173 #define AO_TIM91011_CLK         (2 * AO_PCLK2)
 174 #endif
 175
 176 void ao_lcd_stm_init(void);
 177
 178 void ao_lcd_font_init(void);
 179
 180 void ao_lcd_font_string(char *s);
 181
 182 char
 183 ao_serial1_getchar(void);
 184
 185 void
 186 ao_serial1_putchar(char c);
 187
 188 char
 189 ao_serial1_pollchar(void);
 190
 191 void
 192 ao_serial1_set_speed(uint8_t speed);
 193
 194 char
 195 ao_serial2_getchar(void);
 196
 197 void
 198 ao_serial2_putchar(char c);
 199
 200 char
 201 ao_serial2_pollchar(void);
 202
 203 void
 204 ao_serial2_set_speed(uint8_t speed);
 205
 206 char
 207 ao_serial3_getchar(void);
 208
 209 void
 210 ao_serial3_putchar(char c);
 211
 212 char
 213 ao_serial3_pollchar(void);
 214
 215 void
 216 ao_serial3_set_speed(uint8_t speed);
 217
 218 extern uint32_t ao_radio_cal;
 219
 220 void
 221 ao_adc_init();
 222
 223 #endif /* _AO_ARCH_H_ */
 224