Low Power UART¶
The Low Power UART sample demonstrates the capabilities of the Low power UART driver module.
Overview¶
The sample implements a simple loopback using a single UART instance. The sample has console and logging disabled by default, to demonstrate low power consumption while having UART active.
Requirements¶
The sample supports the following development kits:
Hardware platforms |
PCA |
Board name |
Build target |
|---|---|---|---|
PCA10090 |
|
||
PCA10056 |
|
||
PCA10100 |
|
||
PCA10040 |
|
||
PCA10095 |
|
The sample also requires the following pins to be shorted:
TX (Arduino Digital Pin 10) with RX (Arduino Digital Pin 11)
Request Pin (Arduino Digital Pin 12) with Response Pin (Arduino Digital Pin 13)
Additionally, it requires a logic analyzer.
Building and running¶
This sample can be found under samples/peripheral/lpuart in the nRF Connect SDK folder structure.
See Building and programming a sample application for information about how to build and program the application.
Testing¶
After programming the sample to your development kit, test it by performing the following steps:
Connect the logic analyzer to the shorted pins, to confirm UART activity.
Measure the current to confirm that the power consumption indicates that high-frequency clock is disabled during the idle stage. During the idle stage, the UART receiver is ready to start reception, as the request pin wakes it up.
Dependencies¶
This sample uses the following nRF Connect SDK driver:
In addition, it uses the following Zephyr libraries: