altos: get avr-demo to build. Pull in AVR drivers and LCD driver

This completes the basic task of making an AVR version of altos by
getting the Teensy 'avr-demo' program to build.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 24 insertions, 75 deletions

diff --git a/src/core/ao_task.c b/src/core/ao_task.c
index 41520476..32826114 100644
--- a/src/core/ao_task.c
+++ b/src/core/ao_task.c
@@ -24,6 +24,10 @@ __data uint8_t ao_num_tasks;
 __data uint8_t ao_cur_task_index;
 __xdata struct ao_task *__data ao_cur_task;
 
+#ifdef ao_arch_task_globals
+ao_arch_task_globals
+#endif
+
 void
 ao_add_task(__xdata struct ao_task * task, void (*start)(void), __code char *name) __reentrant
 {
@@ -53,27 +57,16 @@ ao_add_task(__xdata struct ao_task * task, void (*start)(void), __code char *nam
 void
 ao_yield(void) ao_arch_naked_define
 {
-	ao_arch_save_context();
+	ao_arch_save_regs();
 
 	if (ao_cur_task_index == AO_NO_TASK_INDEX)
 		ao_cur_task_index = ao_num_tasks-1;
 	else
 	{
-		uint8_t stack_len;
-		__data uint8_t *stack_ptr;
-		__xdata uint8_t *save_ptr;
-		/* Save the current stack */
-		stack_len = SP - (AO_STACK_START - 1);
-		ao_cur_task->stack_count = stack_len;
-		stack_ptr = (uint8_t __data *) AO_STACK_START;
-		save_ptr = (uint8_t __xdata *) ao_cur_task->stack;
-		do
-			*save_ptr++ = *stack_ptr++;
-		while (--stack_len);
+		ao_arch_save_stack();
 	}
 
-	/* Empty the stack; might as well let interrupts have the whole thing */
-	SP = AO_STACK_START - 1;
+	ao_arch_isr_stack();
 
 	/* Find a task to run. If there isn't any runnable task,
 	 * this loop will run forever, which is just fine
@@ -99,63 +92,20 @@ ao_yield(void) ao_arch_naked_define
 			}
 
 			/* Enter lower power mode when there isn't anything to do */
-			if (ao_next_task_index == ao_cur_task_index)
-				PCON = PCON_IDLE;
+			if (ao_next_task_index == ao_cur_task_index) {
+				ao_arch_cpu_idle();
+			}
 		}
 	}
-
-	{
-		uint8_t stack_len;
-		__data uint8_t *stack_ptr;
-		__xdata uint8_t *save_ptr;
-
-		/* Restore the old stack */
-		stack_len = ao_cur_task->stack_count;
-		SP = AO_STACK_START - 1 + stack_len;
-
-		stack_ptr = (uint8_t __data *) AO_STACK_START;
-		save_ptr = (uint8_t __xdata *) ao_cur_task->stack;
-		do
-			*stack_ptr++ = *save_ptr++;
-		while (--stack_len);
-	}
-
-	_asm
-		pop		_bp
-		pop		PSW
-		pop		ar1
-		pop		ar0
-		pop		ar7
-		pop		ar6
-		pop		ar5
-		pop		ar4
-		pop		ar3
-		pop		ar2
-		pop		b
-		pop		DPH
-		pop		DPL
-		/* The next byte of the stack is the IE register.  Only the global
-		enable bit forms part of the task context.  Pop off the IE then set
-		the global enable bit to match that of the stored IE register. */
-		pop		ACC
-		JB		ACC.7,0098$
-		CLR		_EA
-		LJMP	0099$
-	0098$:
-		SETB		_EA
-	0099$:
-		/* Finally pop off the ACC, which was the first register saved. */
-		pop		ACC
-		ret
-	_endasm;
+	ao_arch_restore_stack();
 }
 
 uint8_t
 ao_sleep(__xdata void *wchan)
 {
-	__critical {
+	ao_arch_critical(
 		ao_cur_task->wchan = wchan;
-	}
+		);
 	ao_yield();
 	ao_cur_task->alarm = 0;
 	if (ao_cur_task->wchan) {
@@ -186,14 +136,16 @@ ao_alarm(uint16_t delay)
 }
 
 void
-ao_exit(void) __critical
+ao_exit(void)
 {
-	uint8_t	i;
-	ao_num_tasks--;
-	for (i = ao_cur_task_index; i < ao_num_tasks; i++)
-		ao_tasks[i] = ao_tasks[i+1];
-	ao_cur_task_index = AO_NO_TASK_INDEX;
-	ao_yield();
+	ao_arch_critical(
+		uint8_t	i;
+		ao_num_tasks--;
+		for (i = ao_cur_task_index; i < ao_num_tasks; i++)
+			ao_tasks[i] = ao_tasks[i+1];
+		ao_cur_task_index = AO_NO_TASK_INDEX;
+		ao_yield();
+		);
 	/* we'll never get back here */
 }
 
@@ -201,16 +153,13 @@ void
 ao_task_info(void)
 {
 	uint8_t	i;
-	uint8_t pc_loc;
 	__xdata struct ao_task *task;
 
 	for (i = 0; i < ao_num_tasks; i++) {
 		task = ao_tasks[i];
-		pc_loc = task->stack_count - 17;
-		printf("%12s: wchan %04x pc %04x\n",
+		printf("%12s: wchan %04x\n",
 		       task->name,
-		       (int16_t) task->wchan,
-		       (task->stack[pc_loc]) | (task->stack[pc_loc+1] << 8));
+		       (int16_t) task->wchan);
 	}
 }