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Comment cleanup

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This commit is contained in:
Reinhard Panhuber
2021-04-30 15:14:27 +02:00
parent 14e2c004cd
commit 5f88def9c9
2 changed files with 5 additions and 12 deletions
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14
src/common/tusb_fifo.c
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@@ -884,12 +884,9 @@ void tu_fifo_advance_read_pointer(tu_fifo_t *f, uint16_t n)
Returns the length and pointer from which bytes can be read in a linear manner.
This is of major interest for DMA transmissions. If returned length is zero the
corresponding pointer is invalid. The returned length is limited to the number
of ITEMS n which the user wants to write into the buffer.
The write pointer does NOT get advanced, use tu_fifo_advance_read_pointer() to
do so! If the length returned is less than n i.e. len<n, then a wrap occurs
and you need to execute this function a second time to get a pointer to the
wrapped part!
corresponding pointer is invalid.
The read pointer does NOT get advanced, use tu_fifo_advance_read_pointer() to
do so!
@param[in] f
Pointer to FIFO
@param[out] *info
@@ -951,8 +948,8 @@ void tu_fifo_get_read_info(tu_fifo_t *f, tu_fifo_buffer_info_t *info)
/*!
@brief Get linear write info
Returns the length and pointer from which bytes can be written into buffer array in a linear manner.
This is of major interest for DMA transmissions not using circular mode. If returned length is zero the
Returns the length and pointer to which bytes can be written into FIFO in a linear manner.
This is of major interest for DMA transmissions not using circular mode. If a returned length is zero the
corresponding pointer is invalid. The returned length is limited to the number of BYTES n which the user
wants to write into the buffer.
The write pointer does NOT get advanced, use tu_fifo_advance_write_pointer() to do so! If the length
@@ -980,7 +977,6 @@ void tu_fifo_get_write_info(tu_fifo_t *f, tu_fifo_buffer_info_t *info, uint16_t
return;
}
// We need n here because we must enforce the read and write pointers to be not more separated than 2*depth!
if (!f->overwritable)
{

3
src/common/tusb_fifo.h
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@@ -140,9 +140,6 @@ void tu_fifo_advance_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
// TODO - update comments
void tu_fifo_get_read_info(tu_fifo_t *f, tu_fifo_buffer_info_t *info);
void tu_fifo_get_write_info(tu_fifo_t *f, tu_fifo_buffer_info_t *info, uint16_t n);