Fix AX25 DAC overflow error message

g4klx / MMDVM

The firmware for the MMDVM (Multi-Mode Digital Voice Modem)

GNU General Public License v2.0

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Fix AX25 DAC overflow error message #327

Closed shawnchain closed 2 years ago

shawnchain commented 2 years ago

The AX25 sine value ranges from 0-4095, and inside io.write() will perform the calculation (value * q15_t(txLevel) >> 15) which may exceed 4096 and cause the DAC Overflow error