RP2040: Fix USB log corruption #199
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USB logging did not handle log buffer overruns correctly, resulting in log corruption after the serial port was opened. Usually this fixed itself quickly enough, but not always. Fixed by adding a separate parameter to log_get_buffer() to indicate number of available bytes in log buffer. Also improves initiator mode USB log performance by calling platform_poll() during retry waits.
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USB logging did not handle log buffer overruns correctly, resulting in log corruption after the serial port was opened. Usually this fixed itself quickly enough, but not always.
Fixed by adding a separate parameter to log_get_buffer() to indicate number of available bytes in log buffer.
Also improves initiator mode USB log performance by calling platform_poll() during retry waits.