mirror of https://github.com/ARMmbed/mbed-os.git
c5d379e908
The USB ISTR register consists of a mix of bits that are write-zero-to-clear and read only bits. As such, to clear a bit in the ISTR, you should simply write the bitwise-NOT of the bit to clear. Previously, the __HAL_PCD_CLEAR_FLAG() macro would do a bitwise-AND with the ISTR register contents to clear a bit, but this could result in another bit being inadvertently cleared if it is set by hardware between the read and the write of the ISTR register. Similarly, the USB endpoint registers have two bits that are write-zero-to-clear, USB_EP_CTR_RX and USB_EP_CTR_TX, but the PCD_CLEAR_RX_EP_CTR() and PCD_CLEAR_TX_EP_CTR() macros wrote back the last read value for one of these bits when clearing the other bit. This could result in inadvertent clearing of one of these bits if it were set by the hardware between the read and the write. These macros have now both been adjusted to always write one to the bit not being cleared to prevent inadvertent clears. |
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| .. | ||
| TARGET_ARM_SSG | ||
| TARGET_Atmel | ||
| TARGET_Freescale | ||
| TARGET_Maxim | ||
| TARGET_NORDIC | ||
| TARGET_NUVOTON | ||
| TARGET_NXP | ||
| TARGET_ONSEMI | ||
| TARGET_RENESAS | ||
| TARGET_STM | ||
| TARGET_Silicon_Labs | ||
| TARGET_WIZNET/TARGET_W7500x | ||
| TARGET_ublox | ||
| targets.json | ||