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This fixes the overflow mathmatic in the fifo

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Nicholas R Dinsmore
2021-02-16 23:08:08 -05:00
parent 09868434cd
commit b7ec66e33a
3 changed files with 4 additions and 2 deletions
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src/common/tusb_fifo.c
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@@ -74,7 +74,7 @@ bool tu_fifo_config(tu_fifo_t *f, void* buffer, uint16_t depth, uint16_t item_si
f->overwritable = overwritable;
f->max_pointer_idx = 2*depth - 1; // Limit index space to 2*depth - this allows for a fast "modulo" calculation but limits the maximum depth to 2^16/2 = 2^15 and buffer overflows are detectable only if overflow happens once (important for unsupervised DMA applications)
f->non_used_index_space = 0xFFFF - f->max_pointer_idx;
f->non_used_index_space = UINT16_MAX - f->max_pointer_idx;
f->rd_idx = f->wr_idx = 0;