STM32F2 and Particle Electron board support

CL: STM32F2 and Particle Electron board support

PUBLISHED_FROM=20dede6546e9f99d2829508177924790d87e985a

common/platforms/arm/arm_nsleep100_m3.S

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014-2019 Cesanta Software Limited
+ * All rights reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the ""License"");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an ""AS IS"" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+.arch armv7e-m
+.syntax unified
+.thumb
+
+/* These are required to satisfy TI linker. */
+.eabi_attribute Tag_ABI_align_needed, 1
+.eabi_attribute Tag_ABI_align_preserved, 1
+
+.global mgos_nsleep100_impl
+.global mgos_nsleep100_loop_count
+
+#ifdef STM32
+.section .RamFunc.mgos_nsleep100_impl
+#else
+.section .iram.mgos_nsleep100_impl
+#endif
+.type mgos_nsleep100_impl, %function
+.align 4
+
+mgos_nsleep100_impl:
+      ldr     r3, =mgos_nsleep100_loop_count
+      ldr     r3, [r3]
+      mul     r0, r3
+      mov     r1, #6
+      udiv    r0, r0, r1
+      cbz     r0, xxx
+lxx:
+      subs    r0, #1
+      bne     lxx
+xxx:
+      bx      lr
+.align 4
+.size mgos_nsleep100_impl, . - mgos_nsleep100_impl

fw/platforms/stm32/Makefile.build

@@ -185,13 +185,11 @@ MGOS_SRCS += $(notdir $(MGOS_CONFIG_C)) $(notdir $(MGOS_RO_VARS_C)) \
 
 STM32_IPATH += $(STM32CUBE_PATH)/Drivers/CMSIS/Include \
                $(FREERTOS_PATH)/Source/include \
-               $(FREERTOS_PATH)/Source/CMSIS_RTOS \
-               $(FREERTOS_PATH)/Source/portable/GCC/ARM_CM7/r0p1
+               $(FREERTOS_PATH)/Source/CMSIS_RTOS
 
 STM32_VPATH += $(FREERTOS_PATH)/Source \
                $(FREERTOS_PATH)/Source/CMSIS_RTOS \
-               $(FREERTOS_PATH)/Source/portable/MemMang \
-               $(FREERTOS_PATH)/Source/portable/GCC/ARM_CM7/r0p1
+               $(FREERTOS_PATH)/Source/portable/MemMang
 
 STM32_SRCS += $(notdir $(wildcard $(FREERTOS_PATH)/Source/*.c) port.c heap_3.c cmsis_os.c)
 

fw/platforms/stm32/include/stm32_sdk_hal.h

@@ -18,7 +18,10 @@
 #ifndef CS_FW_PLATFORMS_STM32_INCLUDE_STM32_SDK_HAL_H_
 #define CS_FW_PLATFORMS_STM32_INCLUDE_STM32_SDK_HAL_H_
 
-#if defined(STM32F4)
+#if defined(STM32F2)
+#include "stm32f2xx_hal.h"
+#include "stm32f2xx_ll_utils.h"
+#elif defined(STM32F4)
 #include "stm32f4xx_hal.h"
 #include "stm32f4xx_ll_utils.h"
 #elif defined(STM32L4)