modelGpsPy

Information

The mirror of Examples.Uart.Sensor: here the device speaks first and waits for no question.

Consequence on the embedded program side: reception never wakes it up (no uart.irq()), so it must poll its input with uart.any() in a loop, sleeping between two passes. A program that forgot to sleep would prevent simulated time from moving forward; a program that slept too long would miss frames — both defects show up immediately when running, which makes it a useful test bench to validate a polling strategy before porting it to the target.

The module is in Script mode (gps.behaviour = Script): Device/gps.py produces complete NMEA RMC sentences — UTC time, hemispheres, checksum —, which the command table cannot do. The microcontroller program checks each checksum, exactly like the embedded code of a real receiver. The script also keeps a counter of transmitted sentences, published on gps.valueOut[1].

The latitude is a ramp: successive sentences differ, which lets you check at a glance in the log that the stream is really alive and not repeated.

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