Walkera 0701 transmitter manual

The walkera module enables to use this transmitter as joystick. At back side of transmitter S-video connector can be found. Between pin 3 and CPU 5k6 resistor can be found. To get modulation pulses to PC, signal pulses must be amplified. Build kernel with walkera module. Module walkera need exclusive access to parport, modules like lp must be unloaded before loading walkera module, check dmesg for error messages. Value for usually irq7 parport must increase if TX is on.

Warning, pulses on ACK are inverted by transistor, irq is raised up on sync to bin change or octal value to bin change. One binary and octal value can be grouped to nibble. Values for first four channels analog joystick values can be found in first 10 nibbles.

Analog value is represented by one sign bit and 9 bit absolute binary value. Next nibble is checksum for first ten nibbles. Next nibbles Binary representations are the same as in first four channels. In nibbles 22 and 23 is a special magic number. Nibble 24 is checksum for nibbles After last octal value for nibble 24 and next sync pulse one additional binary value can be sampled.

This bit and magic number is not used in software driver. Summary of octal values in nibbles must be same as octal value in checksum nibble only first 3 bits are used. Only bit 0 of this sum is used. Value for usually irq7 parport must increase if TX is on. Warning, pulses on ACK are inverted by transistor, irq is raised up on sync to bin change or octal value to bin change.

One binary and octal value can be grouped to nibble. Values for first four channels analog joystick values can be found in first 10 nibbles. Analog value is represented by one sign bit and 9 bit absolute binary value. Next nibble is checksum for first ten nibbles. Next nibbles Binary representations are the same as in first four channels. In nibbles 22 and 23 is a special magic number. Nibble 24 is checksum for nibbles After last octal value for nibble 24 and next sync pulse one additional binary value can be sampled.

This bit and magic number is not used in software driver. Summary of octal values in nibbles must be same as octal value in checksum nibble only first 3 bits are used. Only bit 0 of this sum is used. The Linux Kernel 5. Amiga joystick extensions 3. Apple Touchpad Driver appletouch 4. Intelligent Keyboard ikbd Protocol 5.