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fix(rmt): fix the received symbols issue

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This commit is contained in:
Chen Jichang
2025-03-12 20:26:15 +08:00
parent 40fff636f2
commit 3905701d5a
2 changed files with 14 additions and 4 deletions
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16
components/driver/rmt/rmt_rx.c
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@@ -563,11 +563,21 @@ static bool IRAM_ATTR rmt_isr_handle_rx_done(rmt_rx_channel_t *rx_chan)
// disable the RX engine, it will be enabled again when next time user calls `rmt_receive()`
rmt_ll_rx_enable(hal->regs, channel_id, false);
uint32_t offset = rmt_ll_rx_get_memory_writer_offset(hal->regs, channel_id);
// sanity check
assert(offset >= rx_chan->mem_off);
rmt_ll_rx_set_mem_owner(hal->regs, channel_id, RMT_LL_MEM_OWNER_SW);
// copy the symbols to user space
size_t stream_symbols = offset - rx_chan->mem_off;
// Start from C6, the actual pulse count is the number of input pulses N - 1.
// Resulting in the last threshold interrupts may not be triggered correctly when the number of received symbols is a multiple of the memory block size.
// As shown in the figure below, So we special handle the offset
// mem_off (should be updated here in the last threshold interrupt, but interrupt lost)
// |
// V
// |________|________|
// | |
// offset mem_off(actually here now)
size_t stream_symbols = (offset >= rx_chan->mem_off ? offset - rx_chan->mem_off : rx_chan->mem_off - offset);
size_t copy_size = rmt_copy_symbols(channel->hw_mem_base + rx_chan->mem_off, stream_symbols,
trans_desc->buffer, trans_desc->copy_dest_off, trans_desc->buffer_size);
rmt_ll_rx_set_mem_owner(hal->regs, channel_id, RMT_LL_MEM_OWNER_HW);

2
components/driver/test_apps/rmt/main/test_rmt_rx.c
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/