Frequency shift keying demodulation for wireless power and related systems, methods, and devices

A method of operating a wireless power receiver, the method comprising:

• at a multi-function peripheral including a timing circuit,
• operating in a capture mode responsive to a setting from a processing core;
• receiving a frequency shift keying (FSK) wireless power signal from a wireless power transmitter, the FSK wireless power signal to communicate data bits;
• obtaining a timer count and triggering an interrupt to the processing core every predetermined number of like edges of the FSK wireless power signal;
• and
• providing the obtained timer counts to the processing core via the triggered interrupts;
• at the processing core,
• setting the multi-function peripheral to operate in the capture mode;
• reading the obtained timer counts responsive to the triggered interrupts;
• and
• determining the data bits of the FSK wireless power signal responsive to the obtained timer counts.

A method of operating a wireless power receiver, the method comprising:

• setting, with a processing core, a peripheral to operate in a capture mode;
• receiving, with the peripheral, a measurement signal indicative of a frequency shift keying (FSK) wireless power signal from a wireless power transmitter;
• obtaining a timer count every predetermined number of like edges of the measurement signal;
• triggering, with the peripheral, an interrupt of the processing core for the every predetermined number of like edges of the measurement signal;
• reading, by the processing core responsive to a triggered interrupt, the obtained timer counts;
• and
• determining, by the processing core, a demodulated signal corresponding to the FSK wireless power signal responsive to the obtained timer counts.

A wireless power receiver, comprising:

• a receive coil to receive a frequency shift keying (FSK) wireless power signal from a wireless power transmitter, the FSK wireless power signal to communicate data bits;
• and
• a microcontroller electrically connected to the receive coil, the microcontroller including:
• a multi-function peripheral including a timing circuit, the multi-function peripheral to selectively operate in a capture mode to generate timing information and trigger an interrupt to a processing core every predetermined number of like edges of the FSK wireless power signal;
• and
• the processing core separate from the multi-function peripheral, the processing core to set the multi-function peripheral in the capture mode, read the generated timing information responsive to the triggered interrupts, and determine the data bits of the FSK wireless power signal responsive to the timing information.