Add STM platform and stm-bringup demo program

The stm-bringup doesn't run altos, it just initializes the device and
writes stuff over a serial port. Works on the STM32L Discovery board
at least, should do stuff on other boards too.

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

1 files changed, 129 insertions, 0 deletions

diff --git a/src/stm/ao_arch.h b/src/stm/ao_arch.h
new file mode 100644
index 00000000..e6f54fdb
--- /dev/null
+++ b/src/stm/ao_arch.h
@@ -0,0 +1,129 @@
+/*
+ * 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	256
+
+/* 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); \
+		uint16_t	a = (uint16_t) start; 			\
+		int		i;					\
+									\
+		/* Return address */					\
+		ARM_PUSH32(sp, a);					\
+									\
+		/* Invalid link register */				\
+		ARM_PUSH32(sp, 0xffffffff);				\
+									\
+		/* Clear register values  */				\
+		i = 13;							\
+		while (i--)						\
+			ARM_PUSH32(sp, 0);				\
+									\
+		/* PSR with interrupts enabled */			\
+		ARM_PUSH32(sp, 0x01000000);				\
+		task->sp = sp;						\
+} while (0);
+	
+#define ao_arch_save_regs() do {					\
+		asm("push {r0-r12,lr}\n");				\
+		cli();							\
+		asm("mrs r0,psr" "\n\t" "push {r0}");			\
+		sei();							\
+	} while (0)
+
+#define ao_arch_save_stack() do {					\
+		uint32_t	sp;					\
+		asm("mov %0,sp" : "=&r" (sp) );				\
+		ao_cur_task->sp = (uint32_t *) (sp);			\
+	} 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;					\
+		sp = (uint32_t) ao_cur_task->sp;			\
+		cli();							\
+		asm("mov sp, %0" : : "r" (sp) );			\
+		asm("pop {r0}" "\n\t" "msr psr,r0");			\
+		asm("pop {r0-r12,lr}\n");				\
+		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 */
+};
+
+
+#endif /* _AO_ARCH_H_ */
+