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diff --git a/src/stm32f4/ao_arch.h b/src/stm32f4/ao_arch.h
new file mode 100644
index 00000000..73dc3e93
--- /dev/null
+++ b/src/stm32f4/ao_arch.h
@@ -0,0 +1,141 @@
+/*
+ * Copyright © 2018 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, 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef _AO_ARCH_H_
+#define _AO_ARCH_H_
+
+#include <stdio.h>
+#include <stm32f4.h>
+
+#ifndef AO_STACK_SIZE
+#define AO_STACK_SIZE	2048
+#endif
+
+#ifndef HAS_TASK_QUEUE
+#define HAS_TASK_QUEUE 1
+#endif
+
+#define AO_STACK_ALIGNMENT __attribute__ ((aligned(8)))
+
+#define AO_PORT_TYPE	uint16_t
+
+#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_ROMCONFIG_SYMBOL __attribute__((section(".romconfig"))) const
+
+#define ao_arch_task_members\
+	uint32_t *sp;			/* saved stack pointer */
+
+#define ao_arch_naked_declare	__attribute__((naked))
+#define ao_arch_naked_define
+
+/*
+ * ao_timer.c
+ *
+ * We'll generally use the HSE clock through the PLL
+ */
+
+#define AO_STM_NVIC_CLOCK_PRIORITY	0xf0	/* low priority for clock */
+
+#if AO_HSE
+#define AO_PLLSRC	AO_HSE
+#endif
+
+#if AO_HSI
+#define AO_PLLSRC	STM_HSI_FREQ
+#endif
+
+#if AO_PLL_M
+#define AO_PLLIN	(AO_PLLSRC / AO_PLL_M)
+#endif
+
+#if AO_PLL1_N
+
+#define AO_PLL1_VCO	(AO_PLLIN * AO_PLL1_N)
+#define AO_PLL1_CLK_P	(AO_PLL1_VCO / AO_PLL1_P)
+#define AO_SYSCLK	(AO_PLL1_CLK_P)
+
+# if AO_PLL1_Q
+#define AO_PLL1_CLK_Q	(AO_PLL1_VCO / AO_PLL1_Q)
+# endif
+
+#else
+
+#define AO_SYSCLK	AO_PLLSRC
+
+#endif
+
+#if AO_PLL2_N
+
+#define AO_PLL2_VCO	(AO_PLLIN * AO_PLL2_N)
+
+# if AO_PLL2_Q
+#define AO_PLL2_CLK_Q	(AL_PLL2_VCO / AO_PLL2_Q)
+# endif
+
+# if AO_PLL2_R
+#define AO_PLL2_CLK_R	(AL_PLL2_VCO / AO_PLL2_R)
+# endif
+
+#endif
+
+#define AO_HCLK		(AO_SYSCLK / AO_AHB_PRESCALER)
+#define AO_P1CLK	(AO_HCLK / AO_APB1_PRESCALER)
+#if AO_ABP1_PRESCALER == 1
+#define AO_P1_TIMER_CLK	AO_P1CLK
+#else
+#define AO_P1_TIMER_CLK	(AO_P1CLK * 2)
+#endif
+#define AO_P2CLK	(AO_HCLK / AO_APB2_PRESCALER)
+#if AO_ABP2_PRESCALER == 1
+#define AO_P2_TIMER_CLK	AO_P2CLK
+#else
+#define AO_P2_TIMER_CLK	(AO_P2CLK * 2)
+#endif
+#define AO_SYSTICK	(AO_HCLK)
+#define AO_PANIC_DELAY_SCALE  (AO_SYSCLK / 12000000)
+
+/* The stm32f413 implements only 4 bits of the priority fields? */
+
+#if AO_NONMASK_INTERRUPT
+#define AO_STM_NVIC_NONMASK_PRIORITY	0x00
+
+/* Set the basepri register to this value to mask all
+ * non-maskable priorities
+ */
+#define AO_STM_NVIC_BASEPRI_MASK	0x10
+#endif
+
+#define AO_STM_NVIC_HIGH_PRIORITY	0x40
+#define AO_STM_NVIC_MED_PRIORITY	0x80
+#define AO_STM_NVIC_LOW_PRIORITY	0xC0
+#define AO_STM_NVIC_CLOCK_PRIORITY	0xf0
+
+#define AO_GPIO_MODE_PULL_NONE	0
+#define AO_GPIO_MODE_PULL_UP	4
+#define AO_GPIO_MODE_PULL_DOWN	8
+
+/* usart stuff */
+
+#define AO_SERIAL_SPEED_4800	4800
+#define AO_SERIAL_SPEED_9600	9600
+#define AO_SERIAL_SPEED_19200	19200
+#define AO_SERIAL_SPEED_57600	57600
+#define AO_SERIAL_SPEED_115200	115200
+
+#endif /* _AO_ARCH_H_ */