diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/portable/st/stm32_fsdev/fsdev_common.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/portable/st/stm32_fsdev/fsdev_common.h b/src/portable/st/stm32_fsdev/fsdev_common.h index f5cfa93c8..95854d63d 100644 --- a/src/portable/st/stm32_fsdev/fsdev_common.h +++ b/src/portable/st/stm32_fsdev/fsdev_common.h @@ -467,8 +467,13 @@ uint16_t pma_align_buffer_size(uint16_t size, uint8_t *blsize, uint8_t *num_bloc // Set RX buffer size void btable_set_rx_bufsize(uint32_t ep_id, uint8_t buf_id, uint16_t wCount); -// Delay helper for STM32 FSDEV PMA Buffer Description Table errata (ES0561/ES0587). -// Low-speed path uses CFG_TUSB_FSDEV_BTABLE_LS_DELAY_COUNT, otherwise full-speed count. +/* STM32 FSDEV PMA Buffer Description Table errata workaround: + * - ES0561 (STM32H503), ES0587 (STM32U535/U545) + * - CTR may trigger before final PMA SRAM accesses complete on OUT transfers. + * - Insert delay before reading PMA count/data. + * + * Low-speed path uses CFG_TUSB_FSDEV_BTABLE_LS_DELAY_COUNT, otherwise full-speed count. + */ TU_ATTR_ALWAYS_INLINE static inline void fsdev_btable_workaround_delay(bool low_speed) { #if defined(TUP_USBIP_FSDEV_STM32) && defined(CFG_TUSB_FSDEV_32BIT) uint32_t cycle_count = low_speed ? CFG_TUSB_FSDEV_BTABLE_LS_DELAY_COUNT : CFG_TUSB_FSDEV_BTABLE_FS_DELAY_COUNT; |