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remove tu_fifo_backward_write/read_pointer API

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since it is illegal from fifo perspective
This commit is contained in:
hathach 2021-04-07 13:27:28 +07:00
parent 2468f9e26d
commit 893919a848
2 changed files with 0 additions and 44 deletions
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42
src/common/tusb_fifo.c
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@ -893,48 +893,6 @@ void tu_fifo_advance_read_pointer(tu_fifo_t *f, uint16_t n)
f->rd_idx = advance_pointer(f, f->rd_idx, n); f->rd_idx = advance_pointer(f, f->rd_idx, n);
} }
/******************************************************************************/
/*!
@brief Move back write pointer - intended to be used in combination with DMA.
It is possible to fill the FIFO by use of a DMA in circular mode. Within
DMA ISRs you may update the write pointer to be able to read from the FIFO.
As long as the DMA is the only process writing into the FIFO this is safe
to use.
USE WITH CARE - WE DO NOT CONDUCT SAFTY CHECKS HERE!
@param[in] f
Pointer to the FIFO buffer to manipulate
@param[in] n
Number of items the write pointer moves backward
*/
/******************************************************************************/
void tu_fifo_backward_write_pointer(tu_fifo_t *f, uint16_t n)
{
f->wr_idx = backward_pointer(f, f->wr_idx, n);
}
/******************************************************************************/
/*!
@brief Move back read pointer - intended to be used in combination with DMA.
It is possible to read from the FIFO by use of a DMA in linear mode. Within
DMA ISRs you may update the read pointer to be able to again write into the
FIFO. As long as the DMA is the only process reading from the FIFO this is
safe to use.
USE WITH CARE - WE DO NOT CONDUCT SAFTY CHECKS HERE!
@param[in] f
Pointer to the FIFO buffer to manipulate
@param[in] n
Number of items the read pointer moves backward
*/
/******************************************************************************/
void tu_fifo_backward_read_pointer(tu_fifo_t *f, uint16_t n)
{
f->rd_idx = backward_pointer(f, f->rd_idx, n);
}
/******************************************************************************/ /******************************************************************************/
/*! /*!
@brief Get linear read info @brief Get linear read info

2
src/common/tusb_fifo.h
View File

@ -128,9 +128,7 @@ void tu_fifo_correct_read_pointer (tu_fifo_t* f);
// Pointer modifications intended to be used in combinations with DMAs. // Pointer modifications intended to be used in combinations with DMAs.
// USE WITH CARE - NO SAFTY CHECKS CONDUCTED HERE! NOT MUTEX PROTECTED! // 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_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_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 // 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. // This functions deliver a pointer to start reading/writing from/to and a valid linear length along which no wrap occurs.