X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=src%2Favr%2Fao_arch.h;h=2b1da642ad5de023bcaf0cdff19c9f4b6fc88c4e;hp=a14d0adecc6d7fc3d0cb3d5e0965768c15eb4818;hb=98ea690cc7514f43254f3a6c72668c11820f657c;hpb=a5d873d47b3b16ca32559b4de668bf07b25eddb0

diff --git a/src/avr/ao_arch.h b/src/avr/ao_arch.h
index a14d0ade..2b1da642 100644
--- a/src/avr/ao_arch.h
+++ b/src/avr/ao_arch.h
@@ -3,7 +3,8 @@
  *
  * 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.
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -37,7 +38,11 @@
  * AVR definitions and code fragments for AltOS
  */
 
+#ifndef AO_STACK_SIZE
 #define AO_STACK_SIZE	116
+#endif
+
+#define AO_PORT_TYPE	uint8_t
 
 /* Various definitions to make GCC look more like SDCC */
 
@@ -110,7 +115,6 @@ extern uint8_t	ao_cpu_sleep_disable;
 		asm("push r9" "\n\t" "push r8" "\n\t" "push r7" "\n\t" "push r6" "\n\t" "push r5"); \
 		asm("push r4" "\n\t" "push r3" "\n\t" "push r2" "\n\t" "push r1" "\n\t" "push r0"); \
 		asm("in r0, __SREG__" "\n\t" "push r0");		\
-		sei();							\
 	} while (0)
 
 #define ao_arch_save_stack() do {					\
@@ -122,16 +126,28 @@ extern uint8_t	ao_cpu_sleep_disable;
 
 #define ao_arch_isr_stack()	/* nothing */
 
-#define ao_arch_cpu_idle() do {			\
-		if (!ao_cpu_sleep_disable)	\
+/* Idle the CPU (if possible) waiting for an interrupt. Enabling
+ * interrupts and sleeping the CPU must be adjacent to eliminate race
+ * conditions. In all cases, we execute a single nop with interrupts
+ * enabled
+ */
+#define ao_arch_wait_interrupt() do {		\
+		if (!ao_cpu_sleep_disable) {	\
+			sleep_enable();		\
+			sei();			\
 			sleep_cpu();		\
+			sleep_disable();	\
+		} else {			\
+			sei();			\
+		}				\
+		ao_arch_nop();			\
+		cli();				\
 	} while (0)
 
 #define ao_arch_restore_stack() do { \
 		uint8_t	sp_l, sp_h;					\
 		sp_l = (uint16_t) ao_cur_task->sp;			\
 		sp_h = ((uint16_t) ao_cur_task->sp) >> 8;		\
-		cli();							\
 		asm("out __SP_H__,%0" : : "r" (sp_h) );			\
 		asm("out __SP_L__,%0" : : "r" (sp_l) );			\
 		asm("pop r0"	"\n\t"					\
@@ -148,6 +164,9 @@ extern uint8_t	ao_cpu_sleep_disable;
 
 #define ao_arch_critical(b) do { cli(); do { b } while (0); sei(); } while (0)
 
+#define ao_arch_block_interrupts()	cli()
+#define ao_arch_release_interrupts()	sei()
+
 #define AO_TELESCIENCE_NUM_ADC	12
 
 #endif /* _AO_ARCH_H_ */