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Sample app for ESP8266 controlling the SC16IS752 I2C UART IC
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Simple program to control the NXP SC16IS752 dual UART with I2C/SPI interface This program: - Uses the I2C interface - Registers an interrupt handler to listen for interrupts from the device - Soft resets the device - Initialises the device at adress 0x48 (A0 and A1 pulled to VDD) - Blinks GPIOs 0 and 1 - Sends "Hello World" at 2400,8,N,1 - Waits a while for received data - and if received outputs it to console - Performs a hard reset of the device, by pulling the RESET pin low - Outputs some stats - Starts again This was verified using an otb-iot v0.5 based on an ESP-12F board, driving an SC16IS752 with a 1.8432MHz crystal. Other SC16IS7XX devices may also work, in particular: - SC16IS752 - SC16IS762 - SC16IS750 - SC16IS760 It's unlikely to work with the SC16IS740 as that device has no GPIOs. To build and install run: make flash && make con74 to flash the module and then connect to it over the console interface. If you don't have an ESP8266 build environment and are using linux, use the piersfinlayson/esp8266-build container. To use it run docker as follows: docker run --rm --name esp8266-build-usb -ti -v ~/container-data/builds:/home/esp/builds --device /dev/ttyUSB0:/dev/ttyUSB0 piersfinlayson/esp8266-build Here ~/container-data/builds is a directory on the host containing the sc16is752-esp repo, and the ESP8266 device is connected to /dev/ttyUSB0 on the host. Then run: cd sc16is752-esp Followed by the build commands above. The baud rate of the ESP8266 is assumed to be 74,880 (using the default 26KHz crystal).