The pinMode() call for PIN_FM was guarded by USE_ALTERNATE_POCSAG_LEDS
instead of USE_ALTERNATE_FM_LEDS, a copy and paste error. The Teensy
version and the setFMInt() implementation in this file both use the FM
macro.
m_invalidCount was missing from the constructor initialiser list and was
read uninitialised in process(), making the squelch behaviour after
power-up indeterminate. reset() also cleared neither hysteresis counter,
so state leaked across squelch resets.
handleIRQ() hardcoded USART1 when clearing the RXNE pending bit, so on
boards where the repeater/display UART is not USART1 (Nucleo, Discovery,
F767, UART5-based boards) the flag was cleared on the wrong peripheral.
Use the m_usart member, matching the TXE handling below.
Also fix flush(): it passed a flag constant to USART_GetITStatus and
span while TXE was set, which returns immediately since TXE indicates
the data register is already empty. Wait for the software TX FIFO to
drain and then for the TC flag, which indicates the shift register has
actually emptied.
Clint Chance