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[driver][serial V1]: fix correct data loss logic when RX ring buffer is full #10590

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Merged
Rbb666 merged 1 commit into from
Aug 10, 2025
Merged

[driver][serial V1]: fix correct data loss logic when RX ring buffer is full #10590

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3 changes: 1 addition & 2 deletions components/drivers/serial/dev_serial.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1463,9 +1463,8 @@ void rt_hw_serial_isr(struct rt_serial_device *serial, int event)
/* if the next position is read index, discard this 'read char' */
if (rx_fifo->put_index == rx_fifo->get_index)
{
rx_fifo->get_index += 1;
rx_fifo->get_index = rx_fifo->put_index;
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Copilot AI Aug 10, 2025

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Setting get_index equal to put_index when the buffer is full creates an empty buffer state (get_index == put_index typically indicates empty). This contradicts the is_full flag being set to RT_TRUE on the next line and may cause inconsistent buffer state interpretation elsewhere in the code.

Suggested change
rx_fifo->get_index = rx_fifo->put_index;
rx_fifo->get_index = (rx_fifo->get_index + 1) % serial->config.bufsz;

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rx_fifo->is_full = RT_TRUE;
if (rx_fifo->get_index >= serial->config.bufsz) rx_fifo->get_index = 0;

_serial_check_buffer_size();
}
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