Import IR transmitter library on nrf52840 thread sdk

[mj_zen]

Hi,

I want to make universal AC remote, using nrf52840.

I have decoded IR codes of all AC remotes which have been decoded using IRremoteESP8266 library.

Since AC IR codes are quite long and each AC vendor has their own IR Protocol, how can I send long IR codes on nrf52840?

[Jørgen Holmefjord]

Hi,

The best solution would be to use the PWM peripheral, as this can output sequences directly from RAM without any CPU intervention.

We have implemented IR in our Smart Remote 3 reference design. I would recommend you to have a look at the Infrared transmitter documentation, and download the firmware, to look at how it is implemented in the code.

Best regards,
Jørgen

[mj_zen]

Hi

Thank you for the help.

I have imported the IR driver in NRF_SDK_for_Thread_and_Zigbee and able to send SIRC command. But once the PWM signal is initiated it doesn't stop. After sending the SIRC signal, it keeps on sending some garbage value. it is stuck in m_acknowledgement_handler.

How to get out of acknowledgement handler?

Also I want to control AC using this library.

In AC signals instead of command and address, state is given, can you help me in conversion of this data?

Basically I want to add Panasonic AC IR protocol driver, do you know to add any AC protocol IR driver in it.

[Jørgen Holmefjord]

How did you implement the acknowledgement handler? This should be passed to drv_ir_init(), see m_ir_tx_drv_ack_handler() in m_ir_tx.c.

[mj_zen]

This m_acknowledgement_handler is passed in "drv_ir_send_symbol" in drv_ir_sirc.c file.

In m_acknowledge_handler(mp_ir_symbol), ir signal to be transmitted is passed in this m_acknowledge handler.

But after transmitting the signal once, code is stuck in this handler  and keeps on sending garbage values and my board reboots after sometime because of Watchdog which is enabled in main().

Please suggest what could be done.

[Jørgen Holmefjord]

m_acknowledge_handler is called in drv_ir_send_symbol, but you need to implement it elsewhere in the application. 

m_acknowledge_handler is assigned the argument acknowledge_handler in drv_ir_init() in the bottom of drv_ir_sirc.c file. If you do not pass a handler to this function when you call drv_ir_init() from your application, it will jump to a random address (or possibly the NULL pointer), which most likely will cause a HardFault.