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dcd_stm32_fsdev.c: Fix a bug seend with stm32h5xxx when the driver is compiled with cubeide O1/O2/O3

This commit is contained in:
henneboi 2024-03-11 13:36:25 +01:00
parent 7c66f9b2a4
commit 5a854ef2dc
1 changed files with 13 additions and 0 deletions
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13
src/portable/st/stm32_fsdev/dcd_stm32_fsdev_pvt_st.h
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@ -296,6 +296,19 @@ 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 .
*/
while (count > 0U)
{
asm("NOP");
count--;
}
return (pma32[2*bEpIdx + 1] & 0x03FF0000) >> 16;
#else
__I uint16_t *regPtr = pcd_ep_rx_cnt_ptr(USBx, bEpIdx);