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/*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#ifndef _AO_ARCH_H_
#define _AO_ARCH_H_
#include <stdio.h>
#include <stm32l.h>
/*
* STM32L definitions and code fragments for AltOS
*/
#define AO_STACK_SIZE 1024
/* Various definitions to make GCC look more like SDCC */
#define ao_arch_naked_declare __attribute__((naked))
#define ao_arch_naked_define
#define __pdata
#define __data
#define __xdata
#define __code const
#define __reentrant
#define __critical
#define __interrupt(n)
#define __at(n)
#define ao_arch_reboot() /* XXX */
#define ao_arch_nop() asm("nop")
#define ao_arch_interrupt(n) /* nothing */
#undef putchar
#undef getchar
#define putchar(c) ao_putchar(c)
#define getchar ao_getchar
extern void putchar(char c);
extern char getchar(void);
extern void ao_avr_stdio_init(void);
extern const uint16_t ao_serial_number;
#define ARM_PUSH32(stack, val) (*(--(stack)) = (val))
#define ao_arch_task_members\
uint32_t *sp; /* saved stack pointer */
#define cli() asm("cpsid i")
#define sei() asm("cpsie i")
#define ao_arch_init_stack(task, start) do { \
uint32_t *sp = (uint32_t *) (task->stack + AO_STACK_SIZE); \
uint32_t a = (uint32_t) start; \
int i; \
\
/* APSR */ \
ARM_PUSH32(sp, 0); \
\
/* PRIMASK with interrupts enabled */ \
ARM_PUSH32(sp, 0); \
\
/* Return address (goes into LR) */ \
ARM_PUSH32(sp, a); \
\
/* Clear register values r0-r12 */ \
i = 13; \
while (i--) \
ARM_PUSH32(sp, 0); \
\
task->sp = sp; \
} while (0);
#define ao_arch_save_regs() do { \
uint32_t apsr; \
uint32_t primask; \
\
/* Save APSR */ \
asm("mrs %0,apsr" : "=&r" (apsr)); \
asm("push {%0}" : : "r" (apsr)); \
\
/* Save PRIMASK */ \
asm("mrs %0,primask" : "=&r" (primask)); \
asm("push {%0}" : : "r" (primask)); \
\
/* Save general registers */ \
asm("push {r0-r12,lr}\n"); \
} while (0)
#define ao_arch_save_stack() do { \
uint32_t *sp; \
asm("mov %0,sp" : "=&r" (sp) ); \
ao_cur_task->sp = (sp); \
if ((uint8_t *) sp < ao_cur_task->stack) \
ao_panic (AO_PANIC_STACK); \
} while (0)
#define ao_arch_isr_stack() /* nothing */
#define ao_arch_cpu_idle() do { \
asm("wfi"); \
} while (0)
#define ao_arch_restore_stack() do { \
uint32_t sp; \
uint32_t primask; \
uint32_t apsr; \
sp = (uint32_t) ao_cur_task->sp; \
\
/* Switch stacks */ \
asm("mov sp, %0" : : "r" (sp) ); \
\
/* Restore general registers */ \
asm("pop {r0-r12,lr}\n"); \
\
/* Restore PRIMASK */ \
asm("pop {%0}" : "=&r" (primask) ); \
asm("msr primask,%0" : : "r" (primask) ); \
\
/* Restore APSR */ \
asm("pop {%0}" : "=&r" (apsr) ); \
asm("msr apsr,%0" : : "r" (apsr) ); \
\
/* Return to calling function */ \
asm("bx lr"); \
} while(0)
#define ao_arch_critical(b) do { cli(); do { b } while (0); sei(); } while (0)
#define AO_ARM_NUM_ADC 12
struct ao_adc {
uint16_t tick; /* tick when the sample was read */
uint16_t adc[AO_ARM_NUM_ADC]; /* samples */
};
/*
* For now, we're running at a weird frequency
*/
#define STM_APB1 (16000000 * 6 / 4)
void ao_lcd_stm_init(void);
void ao_lcd_font_string(char *s);
#endif /* _AO_ARCH_H_ */
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