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Tested, working.

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This commit is contained in:
Reinhard Panhuber 2020-09-15 20:40:41 +02:00
parent 349c0f640e
commit 9dfb78e9d8
1 changed files with 9 additions and 8 deletions
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17
src/common/tusb_fifo.c
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@ -65,8 +65,8 @@ bool tu_fifo_config(tu_fifo_t *f, void* buffer, uint16_t depth, uint16_t item_si
f->item_size = item_size; f->item_size = item_size;
f->overwritable = overwritable; f->overwritable = overwritable;
f->non_used_index_space = ((2^16)-1) % depth; f->non_used_index_space = 0x10000 % depth;
f->max_pointer_idx = ((2^16)-1) - f->non_used_index_space; f->max_pointer_idx = 0xFFFF - f->non_used_index_space;
f->rd_idx = f->wr_idx = 0; f->rd_idx = f->wr_idx = 0;
@ -78,13 +78,14 @@ bool tu_fifo_config(tu_fifo_t *f, void* buffer, uint16_t depth, uint16_t item_si
// TODO: To be changed!! // TODO: To be changed!!
static inline uint16_t _ff_mod(uint16_t idx, uint16_t depth) static inline uint16_t _ff_mod(uint16_t idx, uint16_t depth)
{ {
return (idx < depth) ? idx : (idx-depth); // return (idx < depth) ? idx : (idx-depth);
return idx % depth;
} }
// send one item to FIFO WITHOUT updating write pointer // send one item to FIFO WITHOUT updating write pointer
static inline void _ff_push(tu_fifo_t* f, void const * data, uint16_t n, uint16_t wRel) static inline void _ff_push(tu_fifo_t* f, void const * data, uint16_t wRel)
{ {
memcpy(f->buffer + (wRel * f->item_size), data, n*f->item_size); memcpy(f->buffer + (wRel * f->item_size), data, f->item_size);
} }
// send n items to FIFO WITHOUT updating write pointer // send n items to FIFO WITHOUT updating write pointer
@ -107,13 +108,13 @@ static void _ff_push_n(tu_fifo_t* f, void const * data, uint16_t n, uint16_t wRe
} }
// get one item from FIFO WITHOUT updating write pointer // get one item from FIFO WITHOUT updating write pointer
static inline void _ff_pull(tu_fifo_t* f, void const * p_buffer, uint16_t rRel) static inline void _ff_pull(tu_fifo_t* f, void * p_buffer, uint16_t rRel)
{ {
memcpy(p_buffer, f->buffer + (rRel * f->item_size), f->item_size); memcpy(p_buffer, f->buffer + (rRel * f->item_size), f->item_size);
} }
// get n items from FIFO WITHOUT updating write pointer // get n items from FIFO WITHOUT updating write pointer
static void _ff_pull_n(tu_fifo_t* f, void const * p_buffer, uint16_t n, uint16_t rRel) static void _ff_pull_n(tu_fifo_t* f, void * p_buffer, uint16_t n, uint16_t rRel)
{ {
if(rRel + n <= f->depth) // Linear mode only if(rRel + n <= f->depth) // Linear mode only
{ {
@ -136,7 +137,7 @@ static uint16_t advance_pointer(tu_fifo_t* f, uint16_t p, uint16_t pos)
{ {
// We limit the index space of p such that a correct wrap around happens // We limit the index space of p such that a correct wrap around happens
// Check for a wrap around or if we are in unused index space - This has to be checked first!! We are exploiting the wrap around to the correct index // Check for a wrap around or if we are in unused index space - This has to be checked first!! We are exploiting the wrap around to the correct index
if ((p > p + pos) || (p + pos >= f->max_pointer_idx)) if ((p > p + pos) || (p + pos > f->max_pointer_idx))
{ {
p = (p + pos) + f->non_used_index_space; p = (p + pos) + f->non_used_index_space;
} }