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Update dcd_stm32_fsdev.c 

Add a note about pin remapping for the STM32F042Fx
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Jeremy Herbert 2019-12-12 09:40:06 +10:00 committed by GitHub
parent fc7f6f0e1e
commit 9d96b6d66e
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1 changed files with 4 additions and 1 deletions
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src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c
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@ -30,7 +30,7 @@
/**********************************************
* This driver has been tested with the following MCUs:
* - F070, F072, L053
* - F070, F072, L053, F042F6
*
* It also should work with minimal changes for any ST MCU with an "USB A"/"PCD"/"HCD" peripheral. This
* covers:
@ -44,6 +44,9 @@
* L4x2, L4x3 1024 byte buffer
*
* To use this driver, you must:
* - If you are using a device with crystal-less USB, set up the clock recovery system (CRS)
* - Remap pins to be D+/D- on devices that they are shared (for example: F042Fx)
* - This is different to the normal "alternate function" GPIO interface, needs to go through SYSCFG->CFGRx register
* - Enable USB clock; Perhaps use __HAL_RCC_USB_CLK_ENABLE();
* - (Optionally configure GPIO HAL to tell it the USB driver is using the USB pins)
* - call tusb_init();