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diff --git a/src/stmf0/ao_arch.h b/src/stmf0/ao_arch.h
new file mode 100644
index 00000000..6ee71ef9
--- /dev/null
+++ b/src/stmf0/ao_arch.h
@@ -0,0 +1,157 @@
+/*
+ * 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 <stm32f0.h>
+
+/*
+ * STM32F0 definitions and code fragments for AltOS
+ */
+
+#define AO_STACK_SIZE	512
+
+#define AO_LED_TYPE	uint16_t
+
+#ifndef AO_TICK_TYPE
+#define AO_TICK_TYPE	uint16_t
+#define AO_TICK_SIGNED	int16_t
+#endif
+
+#define AO_PORT_TYPE	uint16_t
+
+/* 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 __interrupt(n)
+#define __at(n)
+
+#define ao_arch_reboot() \
+	(stm_scb.aircr = ((STM_SCB_AIRCR_VECTKEY_KEY << STM_SCB_AIRCR_VECTKEY) | \
+			  (1 << STM_SCB_AIRCR_SYSRESETREQ)))
+
+#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);
+
+
+/*
+ * ao_romconfig.c
+ */
+
+#define AO_ROMCONFIG_VERSION	2
+
+#define AO_ROMCONFIG_SYMBOL(a) __attribute__((section(".romconfig"))) const
+
+extern const uint16_t ao_romconfig_version;
+extern const uint16_t ao_romconfig_check;
+extern const uint16_t ao_serial_number;
+extern const uint32_t ao_radio_cal;
+
+#define ao_arch_task_members\
+	uint32_t *sp;			/* saved stack pointer */
+
+#define ao_arch_block_interrupts()	asm("cpsid i")
+#define ao_arch_release_interrupts()	asm("cpsie i")
+
+/*
+ * ao_timer.c
+ *
+ * For the stm32f042, we want to use the USB-based HSI48 clock
+ */
+
+#if AO_HSI48
+
+#define AO_SYSCLK	48000000
+#define AO_HCLK		(AO_SYSCLK / AO_AHB_PRESCALER)
+
+#endif
+
+#if AO_HSE || AO_HSI
+
+#if AO_HSE
+#define AO_PLLSRC	AO_HSE
+#else
+#define AO_PLLSRC	STM_HSI_FREQ
+#endif
+
+#define AO_PLLVCO	(AO_PLLSRC * AO_PLLMUL)
+#define AO_SYSCLK	(AO_PLLVCO / AO_PLLDIV)
+
+#endif
+
+#define AO_HCLK		(AO_SYSCLK / AO_AHB_PRESCALER)
+#define AO_PCLK1	(AO_HCLK / AO_APB1_PRESCALER)
+#define AO_PCLK2	(AO_HCLK / AO_APB2_PRESCALER)
+#define AO_SYSTICK	(AO_HCLK)
+
+#if AO_APB1_PRESCALER == 1
+#define AO_TIM23467_CLK		AO_PCLK1
+#else
+#define AO_TIM23467_CLK		(2 * AO_PCLK1)
+#endif
+
+#if AO_APB2_PRESCALER == 1
+#define AO_TIM91011_CLK		AO_PCLK2
+#else
+#define AO_TIM91011_CLK		(2 * AO_PCLK2)
+#endif
+
+#define AO_STM_NVIC_HIGH_PRIORITY	4
+#define AO_STM_NVIC_CLOCK_PRIORITY	6
+#define AO_STM_NVIC_MED_PRIORITY	8
+#define AO_STM_NVIC_LOW_PRIORITY	10
+
+void ao_lcd_stm_init(void);
+
+void ao_lcd_font_init(void);
+
+void ao_lcd_font_string(char *s);
+
+extern const uint32_t	ao_radio_cal;
+
+void
+ao_adc_init();
+
+/* ADC maximum reported value */
+#define AO_ADC_MAX			4095
+
+#define AO_BOOT_APPLICATION_BASE	((uint32_t *) 0x08001000)
+#define AO_BOOT_APPLICATION_BOUND	((uint32_t *) (0x08000000 + stm_flash_size()))
+#define AO_BOOT_LOADER_BASE		((uint32_t *) 0x08000000)
+#define HAS_BOOT_LOADER			1
+
+#endif /* _AO_ARCH_H_ */
+
+