https://github.com/MetalPhreak/ESP8266_GPIO16_TCP_Example
Microchip MCP23S17 SPI GPIO expander connected over the hardware HSPI module.
TCP Listener configured on port 33333. Send it a 2 byte command to turn the outputs on or off.
On Linux/OSX: echo -ne ‘\xFF\xFF’ | nc 192.168.5.1 33333
Could easily be expanded to a project controlling relays, triacs, etc.
https://github.com/MetalPhreak/ESP8266_MCP23S17
Finished off my MCP23S17 library yesterday and tested it tonight. Works great 😀
Up to 8 of these chips can be connected to the same SPI bus (and the same Chip Select pin!) for a total of 128 GPIO.
https://github.com/MetalPhreak/ESP8266_SPI_Driver
Code library has been updated with much more functionality.
Command Support:
You can now include a command component in the SPI transaction. Commands can be up to 16 bits long.
Address Support:
You can now include an address component in the SPI transaction. Addresses can be up to 32 bits long.
Dummy Bit Support:
The number of dummy bits can now be set if required.
Most importantly, it now implements reading data up to 32bits in length!
Example code snippets and function descriptors are in the README.md file and on the GitHub page.
https://github.com/MetalPhreak/ESP8266_SPI_Driver
Currently only supports sending data packets up to 32bits in size.
You can get started pretty quick with the following code snippet. The spi_init function sets up the hardware to a predefined clock of 4MHz.
spi_init(HSPI);
spi_tx8(HSPI, 0x7A); //send 8 bits of data
spi_tx16(HSPI, 0x7A43); //send 16 bits of data
spi_tx32(HSPI, 0xCAFEFEED); //send 32 bits of data
spi_txd(HSPI, 9, 0b101101110); //send 9 bits of data (useful for driving LCDs with 9bit commands).