How to configure USB pins for custom target based on STM32F746? #10806
Description
Description
I want to create custom target based on STM32F746 discovery, however I want to be able to override clock configuration. Thus I no longer want to inherit the DISCO_F746NG to be able to provide my own pin names and clock configuration.
Initially I had
{
"MY_TARGET": {
"inherits": [
"DISCO_F746NG"
],
"OUTPUT_EXT": "hex"
}
}
in my custom_targets.json. As the clock configuration cannot be altered via configuration options, I decided to modify the custom_targets.json to contain copy of the definitions from targets.json:
{
"MY_TARGET": {
"inherits": ["FAMILY_STM32"],
"core": "Cortex-M7F",
"extra_labels_add": [
"STM32F7",
"STM32F746",
"STM32F746xG",
"STM32F746NG",
"STM_EMAC"
],
"components_add": ["QSPIF", "FLASHIAP"],
"supported_form_factors": ["ARDUINO"],
"config": {
"clock_source": {
"help": "Mask value : USE_PLL_HSE_EXTC | USE_PLL_HSE_XTAL | USE_PLL_HSI",
"value": "USE_PLL_HSE_XTAL|USE_PLL_HSI",
"macro_name": "CLOCK_SOURCE"
},
"usb_speed": {
"help": "Select the USB speed/connector (0=FullSpeed, 1=HighSpeed)",
"value": "1"
},
"lpticker_lptim": {
"help": "This target supports LPTIM. Set value 1 to use LPTIM for LPTICKER, or 0 to use RTC wakeup timer",
"value": 1
}
},
"detect_code": ["0815"],
"macros_add": [
"MBED_TICKLESS",
"USB_STM_HAL",
"USBHOST_OTHER"
],
"device_has_add": [
"ANALOGOUT",
"CAN",
"EMAC",
"SERIAL_ASYNCH",
"TRNG",
"FLASH",
"QSPI",
"USBDEVICE",
"MPU"
],
"release_versions": ["2", "5"],
"device_name": "STM32F746NG",
"bootloader_supported": true,
"overrides": {
"lpticker_delay_ticks": 4,
"network-default-interface-type": "ETHERNET"
},
"OUTPUT_EXT": "hex"
}
}
When I tried to compile the project using such custom target, the compilation did fail at:
[Error] USBPhy_STM32.cpp@296,2: #error "USB pins are not configured !"
There doesn't seem to be any mechanism to configure the USB pins.
What is the correct way to handle the problem? I can think about placing modified USBPhy_STM32.cpp in my project and adding mbed-os/usb/device/targets/TARGET_STM/USBPhy_STM32.cpp to .mbedignore but it doesn't sound like a proper solution.
Issue request type
[X] Question
[ ] Enhancement
[ ] Bug