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81 lines
2.7 KiB
Markdown
81 lines
2.7 KiB
Markdown
# _RMT NEC_TX_RX Example_
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example uses the remote control (RMT) peripheral to transmit and receive codes for the NEC infrared remote protocol.
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## How to Use Example
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### Hardware Required
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* A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
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* A USB cable for Power supply and programming
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By default, this example runs a self test which assumes the TX pin (GPIO18) and RX pin (GPIO19) are _connected together_.
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To disable self-test mode, comment out RMT_RX_SELF_TEST in infrared_nec_main.c, after which, you need to connect a IR transmitter and a receiver to GPIO18 and GPIO19.
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The TX pin and RX pin can be modified in top of the main/infrared_nec_main.c file.
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```
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#define RMT_TX_GPIO_NUM 18 /*!< GPIO number for transmitter signal */
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#define RMT_RX_GPIO_NUM 19 /*!< GPIO number for receiver */
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```
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### Configure the Project
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```
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make menuconfig
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```
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* Set serial port under Serial Flasher Options.
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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make -j4 flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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Run this example, you will see the following output log:
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```
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NEC: RMT TX DATA
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NEC: RMT RCV --- addr: 0xee11 cmd: 0xff00
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NEC: RMT RCV --- addr: 0xed12 cmd: 0xfe01
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NEC: RMT RCV --- addr: 0xec13 cmd: 0xfd02
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NEC: RMT RCV --- addr: 0xeb14 cmd: 0xfc03
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NEC: RMT RCV --- addr: 0xea15 cmd: 0xfb04
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NEC: RMT RCV --- addr: 0xe916 cmd: 0xfa05
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NEC: RMT RCV --- addr: 0xe817 cmd: 0xf906
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NEC: RMT RCV --- addr: 0xe718 cmd: 0xf807
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NEC: RMT RCV --- addr: 0xe619 cmd: 0xf708
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NEC: RMT RCV --- addr: 0xe51a cmd: 0xf609
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NEC: RMT RCV --- addr: 0xe41b cmd: 0xf50a
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NEC: RMT RCV --- addr: 0xe31c cmd: 0xf40b
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NEC: RMT RCV --- addr: 0xe21d cmd: 0xf30c
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NEC: RMT RCV --- addr: 0xe11e cmd: 0xf20d
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NEC: RMT RCV --- addr: 0xe01f cmd: 0xf10e
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NEC: RMT RCV --- addr: 0xdf20 cmd: 0xf00f
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NEC: RMT RCV --- addr: 0xde21 cmd: 0xef10
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NEC: RMT RCV --- addr: 0xdd22 cmd: 0xee11
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NEC: RMT RCV --- addr: 0xdc23 cmd: 0xed12
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NEC: RMT RCV --- addr: 0xdb24 cmd: 0xec13
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NEC: RMT RCV --- addr: 0xda25 cmd: 0xeb14
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```
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## Troubleshooting
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* Programming fail
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* Hardware connection is not correct: run `make monitor`, and reboot your board to see if there is any output logs.
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* The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
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For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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