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Update dcd_stm32_fsdev_pvt_st.h

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Ha Thach 2024-03-25 18:44:51 +07:00 committed by GitHub
parent f9c85ae47b
commit 0610070d07
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1 changed files with 7 additions and 10 deletions
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17
src/portable/st/stm32_fsdev/dcd_stm32_fsdev_pvt_st.h
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@ -296,17 +296,14 @@ TU_ATTR_ALWAYS_INLINE static inline uint32_t pcd_get_ep_rx_cnt(USB_TypeDef * USB
{
#ifdef FSDEV_BUS_32BIT
(void) USBx;
volatile uint32_t count = 10;
/*
WA: few cycles for RX PMA descriptor to update
This workaround is ported from stm32h5xx_hal_pcd.h : PCD_GET_EP_RX_CNT H5
This code fixes an issue when the code is compiled in GCC with a fast optimization(O2/O3) and device with an high frequency.
The function doesn't return the correct value.
Issue observed on Windows 10 and stm32h573i_dk and tud_task() scheduled by IT, the device is not migrated the USB device is not visible .
/* WA: few cycles for RX PMA descriptor to update, otherwise doesn't return the correct value.
Note: required for G0, U5, H5 etc.
This workaround is ported from stm32h5xx_hal_pcd.h and fixes the issue when calling this function fast enough.
Reproduced with GCC ast optimization(O2/O3) and stm32h573i_dk with an high frequency.
Observed on Windows 10 where tud_task() is scheduled by interrupt handler.
*/
while (count > 0U)
{
asm("NOP");
volatile uint32_t count = 10; // defined as PCD_RX_PMA_CNT in stm32 hal_driver
while (count > 0U) {
count--;
}
return (pma32[2*bEpIdx + 1] & 0x03FF0000) >> 16;