#1 #2 0x08011b2c in USB_ReadPMA (USBx=, pbUsrBuf=, wPMABufAddr=, wNBytes=wNBytes@entry=0x1) at C:\Users\laurence.blaxter\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1\system/Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_ll_usb.c:2882 #3 0x0800d5ca in HAL_PCD_EP_DB_Receive (hpcd=hpcd@entry=0x20001f4c , ep=ep@entry=0x200020dc , wEPVal=wEPVal@entry=0xb101) at C:\Users\laurence.blaxter\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1\system/Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_hal_pcd.c:2538 #4 0x0800df02 in PCD_EP_ISR_Handler (hpcd=hpcd@entry=0x20001f4c ) at C:\Users\laurence.blaxter\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1\system/Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_hal_pcd.c:2331 #5 0x0800e0f8 in HAL_PCD_IRQHandler (hpcd=hpcd@entry=0x20001f4c ) at C:\Users\laurence.blaxter\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1\system/Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_hal_pcd.c:1339 #6 0x08014ed4 in USB_HP_CAN1_TX_IRQHandler () at C:\Users\laurence.blaxter\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1\cores\arduino\stm32\usb\usbd_conf.c:408 #7