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refactor _ff_pull_n() with const addr

This commit is contained in:
hathach 2021-04-06 23:12:04 +07:00
parent 58bab86d79
commit d82ee2f8c0
1 changed files with 31 additions and 46 deletions
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77
src/common/tusb_fifo.c
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@ -139,37 +139,30 @@ static void _tu_fifo_read_from_const_src_ptr_in_full_words(void * dst, const voi
}
// Intended to be used to write to hardware USB FIFO in e.g. STM32 where all data is written to a constant address in full word copies
static void _tu_fifo_write_to_const_dst_ptr_in_full_words(void * dst, const void * src, uint16_t len)
static void _ff_pull_const_addr_in_full_words(void * dst, const uint8_t * src, uint16_t len)
{
volatile uint32_t * tx_fifo = (volatile uint32_t *) dst;
// Optimize for fast word copies
typedef struct{
uint32_t val;
} __attribute((__packed__)) unaligned_uint32_t;
unaligned_uint32_t* src_una = (unaligned_uint32_t *) src;
// Pushing full available 32 bit words to FIFO
uint16_t full_words = len >> 2;
while(full_words--)
{
*tx_fifo = src_una->val;
src_una++;
*tx_fifo = tu_unaligned_read32(src);
src += 4;
}
// Write the remaining 1-3 bytes into FIFO
uint8_t bytes_rem = len & 0x03;
if(bytes_rem){
uint8_t * src_u8 = (uint8_t *) src_una;
uint32_t tmp = 0;
uint8_t * dst_u8 = (uint8_t *)&tmp;
if(bytes_rem)
{
uint32_t tmp32 = 0;
uint8_t* dst8 = (uint8_t*) &tmp32;
while(bytes_rem--)
{
*dst_u8++ = *src_u8++;
*dst8++ = *src++;
}
*tx_fifo = tmp;
*tx_fifo = tmp32;
}
}
@ -270,12 +263,12 @@ static inline void _ff_pull(tu_fifo_t* f, void * p_buffer, uint16_t rRel)
}
// get n items from FIFO WITHOUT updating read pointer
static void _ff_pull_n(tu_fifo_t* f, void * p_buffer, uint16_t n, uint16_t rRel, tu_fifo_copy_mode_t copy_mode)
static void _ff_pull_n(tu_fifo_t* f, uint8_t* p_buffer, uint16_t n, uint16_t rRel, tu_fifo_copy_mode_t copy_mode)
{
switch (copy_mode)
{
case TU_FIFO_COPY_INC:
if(n <= f->depth-rRel)
if ( n <= f->depth - rRel )
{
// Linear mode only
memcpy(p_buffer, f->buffer + (rRel * f->item_size), n*f->item_size);
@ -289,68 +282,60 @@ static void _ff_pull_n(tu_fifo_t* f, void * p_buffer, uint16_t n, uint16_t rRel,
memcpy(p_buffer, f->buffer + (rRel * f->item_size), nLin*f->item_size);
// Read data wrapped part
memcpy((uint8_t*)p_buffer + nLin*f->item_size, f->buffer, (n - nLin) * f->item_size);
memcpy(p_buffer + nLin*f->item_size, f->buffer, (n - nLin) * f->item_size);
}
break;
case TU_FIFO_COPY_CST_FULL_WORDS:
if(n <= f->depth-rRel)
if ( n <= f->depth - rRel )
{
// Linear mode only
_tu_fifo_write_to_const_dst_ptr_in_full_words(p_buffer, f->buffer + (rRel * f->item_size), n*f->item_size);
_ff_pull_const_addr_in_full_words(p_buffer, f->buffer + (rRel * f->item_size), n*f->item_size);
}
else
{
// since it is const address, we don't increase p_buffer
volatile uint32_t * tx_fifo = (volatile uint32_t *) p_buffer;
uint8_t* src = f->buffer + (rRel * f->item_size);
// Wrap around case
uint16_t nLin = (f->depth - rRel) * f->item_size;
uint16_t nLin_4n = nLin & 0xFFFC;
uint16_t nWrap = (n - nLin) * f->item_size;
// Optimize for fast word copies
typedef struct{
uint32_t val;
} __attribute((__packed__)) unaligned_uint32_t;
// Read data from linear part of buffer
_ff_pull_const_addr_in_full_words(p_buffer, src, nLin_4n);
unaligned_uint32_t* src = (unaligned_uint32_t*)(f->buffer + (rRel * f->item_size));
src += nLin_4n;
volatile uint32_t * tx_fifo = (volatile uint32_t *) p_buffer;
// Pushing full available 32 bit words to FIFO
uint16_t full_words = nLin >> 2;
while(full_words--)
{
*tx_fifo = src->val;
src++;
}
uint8_t * src_u8;
uint8_t rem = nLin & 0x03;
// There could be odd 1-3 bytes before the wrap-around boundary
// Handle wrap around - do it manually as these are only 4 bytes and its faster without memcpy
uint8_t rem = nLin & 0x03;
if (rem > 0)
{
src_u8 = (uint8_t *) src;
uint8_t remrem = tu_min16(nWrap, 4-rem);
nWrap -= remrem;
uint32_t tmp;
uint8_t * dst_u8 = (uint8_t *)&tmp;
while(rem--)
{
*dst_u8++ = *src_u8++;
*dst_u8++ = *src++;
}
src_u8 = f->buffer;
src = f->buffer;
while(remrem--)
{
*dst_u8++ = *src_u8++;
*dst_u8++ = *src++;
}
*tx_fifo = tmp;
}
else
{
src_u8 = f->buffer;
src = f->buffer; // wrap around to beginning
}
// Final linear part
if (nWrap > 0) _tu_fifo_write_to_const_dst_ptr_in_full_words(p_buffer, src_u8, nWrap);
if (nWrap > 0) _ff_pull_const_addr_in_full_words(p_buffer, src, nWrap);
}
break;
}
@ -482,7 +467,7 @@ static uint16_t _tu_fifo_peek_at_n(tu_fifo_t* f, uint16_t offset, void * p_buffe
uint16_t rRel = get_relative_pointer(f, rAbs, offset);
// Peek data
_ff_pull_n(f, p_buffer, n, rRel, copy_mode);
_ff_pull_n(f, (uint8_t*) p_buffer, n, rRel, copy_mode);
return n;
}