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dcd_stm32_fsdev : Implement FIFO transfer correctly.

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This commit is contained in:
Mengsk
2022-12-28 17:16:49 +01:00
parent 17990025bb
commit b156a8b78c
1 changed files with 68 additions and 49 deletions
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117
src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c
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@@ -6,6 +6,8 @@
* Portions:
* Copyright (c) 2016 STMicroelectronics
* Copyright (c) 2019 Ha Thach (tinyusb.org)
* Copyright (c) 2022 Simon K<>ppers (skuep)
* Copyright (c) 2022 HiFiPhile
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -987,7 +989,7 @@ bool dcd_edpt_xfer_fifo (uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, uint16
uint8_t const dir = tu_edpt_dir(ep_addr);
xfer->buffer = NULL;
xfer->ff = ff; // TODO support dcd_edpt_xfer_fifo API
xfer->ff = ff;
xfer->total_len = total_bytes;
xfer->queued_len = 0;
@@ -1088,7 +1090,7 @@ static bool dcd_write_packet_memory(uint16_t dst, const void *__restrict src, si
if (wNBytes & 0x01)
{
temp1 = *srcVal;
*pdwVal = temp2;
*pdwVal = temp1;
}
return true;
@@ -1100,40 +1102,46 @@ static bool dcd_write_packet_memory(uint16_t dst, const void *__restrict src, si
* @param wNBytes no. of bytes to be copied.
* @retval None
*/
// THIS FUNCTION IS UNTESTED
static bool dcd_write_packet_memory_ff(tu_fifo_t * ff, uint16_t dst, uint16_t wNBytes)
{
// Since we copy from a ring buffer FIFO, a wrap might occur making it necessary to conduct two copies
// Check for first linear part
tu_fifo_buffer_info_t info;
tu_fifo_get_read_info(ff, &info); // We want to read from the FIFO
TU_VERIFY(info.len_lin && dcd_write_packet_memory(dst, info.ptr_lin, info.len_lin)); // and write it into the PMA
tu_fifo_advance_read_pointer(ff, info.len_lin);
// Check for wrapped part
if (info.len_wrap)
tu_fifo_get_read_info(ff, &info);
uint16_t cnt_lin = TU_MIN(wNBytes, info.len_lin);
uint16_t cnt_wrap = TU_MIN(wNBytes - cnt_lin, info.len_wrap);
// We want to read from the FIFO and write it into the PMA, if LIN part is ODD and has WRAPPED part,
// last lin byte will be combined with wrapped part
// To ensure PMA is always access 16bit aligned (dst aligned to 16 bit)
if((cnt_lin & 0x01) && cnt_wrap)
{
// Update destination pointer
dst += info.len_lin;
uint8_t* src = (uint8_t*)info.ptr_wrap;
uint16_t len2 = info.len_wrap;
// Copy first linear part
dcd_write_packet_memory(dst, info.ptr_lin, cnt_lin &~0x01);
dst += cnt_lin &~0x01;
// Since PMA is accessed 16-bit wise we need to handle the case when a 16 bit value was split
if (info.len_lin % 2) // If len is uneven there is a byte left to copy
{
TU_ASSERT(false); // TODO: Step through and check -> untested
// Copy last linear byte & first wrapped byte
uint16_t tmp = ((uint8_t*)info.ptr_lin)[cnt_lin - 1] | ((uint16_t)(((uint8_t*)info.ptr_wrap)[0]) << 8U);
dcd_write_packet_memory(dst, &tmp, 2);
dst += 2;
uint16_t temp = ((uint8_t *)info.ptr_lin)[info.len_lin-1] | src[0] << 16; // CHECK endianess
pma[PMA_STRIDE*(dst>>1)] = temp;
src++;
len2--;
}
TU_VERIFY(dcd_write_packet_memory(dst, src, len2));
tu_fifo_advance_write_pointer(ff, info.len_wrap);
// Copy rest of wrapped byte
dcd_write_packet_memory(dst, ((uint8_t*)info.ptr_wrap) + 1, cnt_wrap - 1);
}
else
{
// Copy linear part
dcd_write_packet_memory(dst, info.ptr_lin, cnt_lin);
dst += info.len_lin;
if(info.len_wrap)
{
// Copy wrapped byte
dcd_write_packet_memory(dst, info.ptr_wrap, cnt_wrap);
}
}
tu_fifo_advance_read_pointer(ff, cnt_lin + cnt_wrap);
return true;
}
@@ -1178,9 +1186,6 @@ static bool dcd_read_packet_memory(void *__restrict dst, uint16_t src, size_t wN
* @param wNBytes no. of bytes to be copied.
* @retval None
*/
// THIS FUNCTION IS UNTESTED
static bool dcd_read_packet_memory_ff(tu_fifo_t * ff, uint16_t src, uint16_t wNBytes)
{
// Since we copy into a ring buffer FIFO, a wrap might occur making it necessary to conduct two copies
@@ -1188,29 +1193,43 @@ static bool dcd_read_packet_memory_ff(tu_fifo_t * ff, uint16_t src, uint16_t wNB
tu_fifo_buffer_info_t info;
tu_fifo_get_write_info(ff, &info); // We want to read from the FIFO
TU_VERIFY(info.len_lin && dcd_read_packet_memory(info.ptr_lin, src, info.len_lin));
tu_fifo_advance_write_pointer(ff, info.len_lin);
uint16_t cnt_lin = TU_MIN(wNBytes, info.len_lin);
uint16_t cnt_wrap = TU_MIN(wNBytes - cnt_lin, info.len_wrap);
// Check for wrapped part
if (info.len_wrap)
// We want to read from PMA and write it into the FIFO, if LIN part is ODD and has WRAPPED part,
// last lin byte will be combined with wrapped part
// To ensure PMA is always access 16bit aligned (src aligned to 16 bit)
if((cnt_lin & 0x01) && cnt_wrap)
{
// Update source pointer
src += info.len_lin;
// Copy first linear part
dcd_read_packet_memory(info.ptr_lin, src, cnt_lin &~0x01);
src += cnt_lin &~0x01;
// Since PMA is accessed 16-bit wise we need to handle the case when a 16 bit value was split
if (info.len_lin % 2) // If len is uneven there is a byte left to copy
{
TU_ASSERT(false); //TODO: step through -> untested
uint32_t temp = pma[PMA_STRIDE*(src>>1)];
*((uint8_t *)info.ptr_wrap++) = ((temp >> 8) & 0xFF);
src++;
tu_fifo_advance_write_pointer(ff, 1);
info.len_wrap--;
}
// Copy last linear byte & first wrapped byte
uint16_t tmp;
dcd_read_packet_memory(&tmp, src, 2);
((uint8_t*)info.ptr_lin)[cnt_lin - 1] = (uint8_t)tmp;
((uint8_t*)info.ptr_wrap)[0] = (uint8_t)(tmp >> 8U);
src += 2;
TU_VERIFY(dcd_read_packet_memory(info.ptr_wrap, src, info.len_wrap));
tu_fifo_advance_write_pointer(ff, info.len_wrap);
// Copy rest of wrapped byte
dcd_read_packet_memory(((uint8_t*)info.ptr_wrap) + 1, src, cnt_wrap - 1);
}
else
{
// Copy linear part
dcd_read_packet_memory(info.ptr_lin, src, cnt_lin);
src += cnt_lin;
if(info.len_wrap)
{
// Copy wrapped byte
dcd_read_packet_memory(info.ptr_wrap, src, cnt_wrap);
}
}
tu_fifo_advance_write_pointer(ff, cnt_lin + cnt_wrap);
return true;
}