Hi,
I'm trying to use LPUART in interrupt mode (not async), but I can't get it to work.
I'm using the sample in NCS, which works when using async.
When I uncomment the line in prj.conf to activate the interrupt mode, the power consumption goes way up (around +1 mA).
What am I doing wrong to work with LPUART in interrupt mode ?
Regards
Giuliano
Hello, I tested the LPUART sample with interrupt NCS 2.0.0, nrf5340dk_nrf5340_cpuapp and CONFIG_NRF_SW_LPUART_INT_DRIVEN=y. I measured a current of 94.3 uA, not as low as I expected, but definitely lower than 1 mA. When using the lpuart in async mode, I measured a current of around 94 uA as well.
You can see that the communication happen as expected with 600ms between each transfer.
Here is the sample I used, with build folder attached, so you can compare. I used NCS v2.0.0 and the nRF5340DK v0.11.0. I disabled uart logging and enabled the interrupt driven Kconfig.
Let me know if you get the same result (94uA) or 1mA
Best regards,
Simon
GiulianoFranchetto said:Are you sure you are indeed using INT mode and not ASYNC mode here ?
Yes, I'm pretty sure. I also modified main.c to look like this:
void main(void)
{
const struct device *lpuart = DEVICE_DT_GET(DT_NODELABEL(lpuart));
printk("LPUART sample started\n");
__ASSERT(device_is_ready(lpuart), "LPUART device not ready");
//if (IS_ENABLED(CONFIG_NRF_SW_LPUART_INT_DRIVEN)) {
interrupt_driven(lpuart);
//} else {
// async(lpuart);
//}
}
Then I modified the delay between each transfer to 2.1 seconds
static void interrupt_driven(const struct device *dev)
{
uint8_t c = 0xff;
uart_irq_callback_set(dev, uart_irq_handler);
uart_irq_rx_enable(dev);
while (1) {
uart_irq_tx_enable(dev);
k_sleep(K_MSEC(2000));
uart_poll_out(dev, c);
k_sleep(K_MSEC(100));
}
}
When looking at the result in the Power Profiler, I saw a delay of 2.1 second between each transfer and a current of 83uA.
I used the nRF5340 DK v0.11, the board nrf5340dk_nrf5340_cpuapp and NCS v2.0.0. I also connected together req (P1.14) to rdy (P1.15) and RX (P1.12) to TX (P1.13).
I did not get any warnings when building the project with NCS v2.0.0. Here is the build output:
* Executing task: nRF Connect: Build: lpuart_test/build_5340 (active)
Building lpuart_test
west build --build-dir c:\nordic\ncs_samples_local\lpuart_test\build_5340 c:\nordic\ncs_samples_local\lpuart_test --pristine --board nrf5340dk_nrf5340_cpuapp -- -DNCS_TOOLCHAIN_VERSION:STRING="NONE" -DBOARD_ROOT:STRING="c:/nordic/ncs_samples_local/ibeacon_master_sample;c:/Users/siiv/Downloads/central_usb_amc/central_usb_amc;c:/nordic/ncs_samples_local/hci_spi_slave_sample;c:/nordic/ncs_samples_local/ibeacon_master_sample_initial;c:/nordic/ncs_samples_local/hci_spi_slave_sample_initial;c:/nordic/ncs_samples_local/lpuart_test;c:/Users/siiv/Downloads/can_driver/can_driver" -DDTC_OVERLAY_FILE:STRING="c:/nordic/ncs_samples_local/lpuart_test/boards/nrf5340dk_nrf5340_cpuapp.overlay" -DCONF_FILE:STRING="c:/nordic/ncs_samples_local/lpuart_test/prj.conf;c:/nordic/ncs_samples_local/lpuart_test/boards/nrf5340dk_nrf5340_cpuapp.conf"
-- west build: generating a build system
Loading Zephyr default modules (Zephyr base).
-- Application: C:/nordic/ncs_samples_local/lpuart_test
-- Found Python3: C:/toolchains/v2.0.0/opt/bin/python.exe (found suitable exact version "3.8.2") found components: Interpreter
-- Cache files will be written to: C:/v2.0.0/zephyr/.cache
-- Zephyr version: 3.0.99 (C:/v2.0.0/zephyr)
-- Found west (found suitable version "0.13.1", minimum required is "0.7.1")
-- Board: nrf5340dk_nrf5340_cpuapp
-- Found host-tools: zephyr 0.14.1 (C:/toolchains/v2.0.0/opt/zephyr-sdk)
-- Found dtc: C:/toolchains/v2.0.0/opt/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found toolchain: zephyr 0.14.1 (C:/toolchains/v2.0.0/opt/zephyr-sdk)
-- Found BOARD.dts: C:/v2.0.0/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpuapp.dts
-- Found devicetree overlay: c:/nordic/ncs_samples_local/lpuart_test/boards/nrf5340dk_nrf5340_cpuapp.overlay
-- Generated zephyr.dts: C:/nordic/ncs_samples_local/lpuart_test/build_5340/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: C:/nordic/ncs_samples_local/lpuart_test/build_5340/zephyr/include/generated/devicetree_unfixed.h
-- Generated device_extern.h: C:/nordic/ncs_samples_local/lpuart_test/build_5340/zephyr/include/generated/device_extern.h
-- Including generated dts.cmake file: C:/nordic/ncs_samples_local/lpuart_test/build_5340/zephyr/dts.cmake
Parsing C:/v2.0.0/zephyr/Kconfig
Loaded configuration 'C:/v2.0.0/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpuapp_defconfig'
Merged configuration 'c:/nordic/ncs_samples_local/lpuart_test/prj.conf'
Merged configuration 'c:/nordic/ncs_samples_local/lpuart_test/boards/nrf5340dk_nrf5340_cpuapp.conf'
Configuration saved to 'C:/nordic/ncs_samples_local/lpuart_test/build_5340/zephyr/.config'
Kconfig header saved to 'C:/nordic/ncs_samples_local/lpuart_test/build_5340/zephyr/include/generated/autoconf.h'
-- The C compiler identification is GNU 10.3.0
-- The CXX compiler identification is GNU 10.3.0
-- The ASM compiler identification is GNU
-- Found assembler: C:/toolchains/v2.0.0/opt/zephyr-sdk/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc.exe
-- Configuring done
-- Generating done
-- Build files have been written to: C:/nordic/ncs_samples_local/lpuart_test/build_5340
-- west build: building application
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Here is the latest version of the project:
GiulianoFranchetto said:I've checked the zephyr/include/generated/autoconf.h, and the LP UART seems to remain in async mode, not in INT mode.
I checked \lpuart_test\build_5340\zephyr\.config and I saw that CONFIG_UART_ASYNC_API=y. However, I also saw CONFIG_UART_INTERRUPT_DRIVEN=y and CONFIG_NRF_SW_LPUART_INT_DRIVEN=y in the .config file. But, as you see in the reply above I was using the interrupt driven approach in main.c.
Best regards,
Simon