STM32F103C8 Mbed Support

Development Platforms
5

Indeed it fails in mbed-os internals for the thread_sleep_for. When initializing the OS timer (triggered by thread_sleep_for) it sees that it wasn’t properly configured to either use “tickless from µS ticker” with a µS ticker peripheral or not tickless from µS ticker but a low-power ticker. The bluepill has no LPTIM but it has several TIMs, so low-power ticker is not possible and the normal µS ticker should be used.

grafik
grafik802×285 15.9 KB

Can be fixed by overriding tickless-from-us-ticker for the bluepill target in the target.json file (found in C:\Users\<user>\.platformio\packages\framework-mbed\targets\target.json) via the overrides directive.

    "BLUEPILL_F103C8": {
        "inherits": ["FAMILY_STM32"],
        "core": "Cortex-M3",
        "default_toolchain": "GCC_ARM",
        "extra_labels_add": ["STM32F1", "STM32F103C8"],
        "supported_toolchains": ["GCC_ARM"],
        "device_has_add": [
            "CAN",
            "SERIAL_ASYNCH",
            "FLASH"
        ],
        "device_has_remove": ["STDIO_MESSAGES", "LPTICKER"],
	"overrides": {
            "tickless-from-us-ticker": true
        }
    },

Also note that the LED is logically inverted so writing 1 to it will make it turn off.

I’ll check why this isn’t the default anymore…

1 Like