RTOS/CC2640R2F: Decoding infra red signal using simple_peripheral project

Achille Tchouzin

Part Number: CC2640R2F

Tool/software: TI-RTOS

Hello,
I have a problem concerning the decoding of the 56 Khz IR signal (RCA). I am using the simple_peripheral basic project. The period and frequency of IR signals with frequencies of 30 to 40 KHz are well decoded and calculated. But that at 56 KHz does not give the expected results, because several interruptions are omitted. My goal is to retransmit decoded IR signals, by Bluetooth whatever the remote control used.
I wonder if the microcontroller is not able to detect and process interrupts at this frequency.

Thank you in advance for your answer.

Achille T.

over 6 years ago

0 Aslak N. over 6 years ago

TI__Mastermind 23440 points

Hi Achille,

It sounds like you need to be using the GPTimer peripheral in input capture mode, and use DMA to store the transition timings. Alternatively use the on-chip Sensor Controller CPU core to capture these signals.

For reference:
GPTimer:
RTOS driver: dev.ti.com/.../_g_p_timer_c_c26_x_x_8h.html
driverlib api: dev.ti.com/.../group__timer__api.html
registers: dev.ti.com/.../GPT0.html

uDMA:
rtos driver: dev.ti.com/.../_u_d_m_a_c_c26_x_x_8h.html
driverlib: dev.ti.com/.../group__udma__api.html
example usage in SPICC26XX.c

It sounds like this particular problem is not related to BLE specifically so I'll reassign this to another forum FYI.

Best regards,
Aslak

0 Achille Tchouzin over 6 years ago in reply to Aslak N.

Prodigy 20 points

Hallo Aslak,

Thank you for your answer,

Initially I started using the GPTimer library. But it was not possible to have accurate microsecond counts. This is the reason for which I went through the configuration of the registers.

The other question was, how can I create a service for Bluetooth transmission of decoded IR signal data (frequency, different times of 1 and 0) to a tablet? This is a table of about 110 values.
In addition I will also receive this data from the tablet to my MCU.
the exchange between the MCU and the tablet had to be bidirectional.

Thanks again,

Regards,

Achille T.

0 Aslak N. over 6 years ago in reply to Achille Tchouzin

TI__Mastermind 23440 points

Hi Achille,

Please refer to SImpleLink Academy for how to make a service like you describe: dev.ti.com/.../

Best regards,
Aslak

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to Achille Tchouzin

TI__Guru 58425 points

Hi Achille,

I suggest you have a look at the Sensor Controller, you should be able to implement a IR decoder using it.
In the sensor controller you have access to the TDC (Time to digital) hardware which should provide enough resolution for you to work with.

There is trainings available on the Sensor Controller on SimpleLink Academy.

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RTOS/CC2640R2F: Decoding infra red signal using simple_peripheral project