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Improve tu_fifo capabilites

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Added tu_fifo_get_linear_write_info(), tu_fifo_backward_write_pointer(),
and tu_fifo_backward_read_pointer()
This commit is contained in:
Reinhard Panhuber
2021-02-17 20:44:26 +01:00
parent a5d7b6266d
commit c87357c025
2 changed files with 204 additions and 9 deletions
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11
src/common/tusb_fifo.h
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@@ -128,13 +128,22 @@ uint16_t tu_fifo_count (tu_fifo_t* f);
bool tu_fifo_empty (tu_fifo_t* f);
bool tu_fifo_full (tu_fifo_t* f);
uint16_t tu_fifo_remaining (tu_fifo_t* f);
bool tu_fifo_overflowed (tu_fifo_t* f);
bool tu_fifo_overflowed (tu_fifo_t* f);
void tu_fifo_correct_read_pointer (tu_fifo_t* f);
// Pointer modifications intended to be used in combinations with DMAs.
// USE WITH CARE - NO SAFTY CHECKS CONDUCTED HERE! NOT MUTEX PROTECTED!
void tu_fifo_advance_write_pointer (tu_fifo_t *f, uint16_t n);
void tu_fifo_backward_write_pointer (tu_fifo_t *f, uint16_t n);
void tu_fifo_advance_read_pointer (tu_fifo_t *f, uint16_t n);
void tu_fifo_backward_read_pointer (tu_fifo_t *f, uint16_t n);
// If you want to read/write from/to the FIFO by use of a DMA, you may need to conduct two copies to handle a possible wrapping part
// This functions deliver a pointer to start reading/writing from/to and a valid linear length along which no wrap occurs.
// In case not all of your data is available within one read/write, update the read/write pointer by
// tu_fifo_advance_read_pointer()/tu_fifo_advance_write_pointer and conduct a second read/write operation
uint16_t tu_fifo_get_linear_read_info (tu_fifo_t *f, uint16_t offset, void **ptr, uint16_t n);
uint16_t tu_fifo_get_linear_write_info (tu_fifo_t *f, uint16_t offset, void **ptr, uint16_t n);
static inline bool tu_fifo_peek(tu_fifo_t* f, void * p_buffer)
{