diff options
Diffstat (limited to 'src/common/tusb_fifo.h')
| -rw-r--r-- | src/common/tusb_fifo.h | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/src/common/tusb_fifo.h b/src/common/tusb_fifo.h index 42f154bca..2e2a0db6f 100644 --- a/src/common/tusb_fifo.h +++ b/src/common/tusb_fifo.h @@ -157,8 +157,8 @@ typedef enum { // Setup API //--------------------------------------------------------------------+ bool tu_fifo_config(tu_fifo_t *f, void *buffer, uint16_t depth, uint16_t item_size, bool overwritable); -bool tu_fifo_set_overwritable(tu_fifo_t *f, bool overwritable); -bool tu_fifo_clear(tu_fifo_t *f); +void tu_fifo_set_overwritable(tu_fifo_t *f, bool overwritable); +void tu_fifo_clear(tu_fifo_t *f); #if OSAL_MUTEX_REQUIRED TU_ATTR_ALWAYS_INLINE static inline @@ -224,10 +224,11 @@ TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_fifo_write_n(tu_fifo_t *f, const //--------------------------------------------------------------------+ // return overflowable count (index difference), which can be used to determine both fifo count and an overflow state TU_ATTR_ALWAYS_INLINE static inline uint16_t tu_ff_overflow_count(uint16_t depth, uint16_t wr_idx, uint16_t rd_idx) { - if (wr_idx >= rd_idx) { - return (uint16_t)(wr_idx - rd_idx); + const int32_t diff = (int32_t)wr_idx - (int32_t)rd_idx; + if (diff >= 0) { + return (uint16_t)diff; } else { - return (uint16_t)(2 * depth - (rd_idx - wr_idx)); + return (uint16_t)(2 * depth + diff); } } |