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- /* unit test for Port_MCP23S17
- Picture of hardware is in unit_tests/PortMCP23S17_read/PortMCP23S17_bb.JPG
- The setup is an MCP23S17 I/O expander on a Teensy LC controller.
- MCP23S17 port-A GPIO pins are not connected to anything.
- Port-A GPIO-pin ouputs alternate between 0 and 3.3 volts.
-
- Use a volt meter to measure port-A GPIO-pin outputs or red LED.
- */
- #include "Port_MCP23S17.h"
-
- const uint8_t IOE_ADDR = 0x20; //MCP23S17 address, all 3 ADDR pins grounded
- Port_MCP23S17 portA(IOE_ADDR , 0, 0); //PortAWrite needed for begin()
-
- void setup()
- {
- delay(6000);
- Keyboard.println("start setup");
- portA.begin(LOW); //HIGH or LOW, not matter if readPins=0
- Keyboard.println("start loop");
- }
-
- void loop()
- {
- portA.write(~0, HIGH); //set all GPIOA pins HIGH
- delay(2000);
-
- portA.write(~0, LOW); //set all GPIOA pins LOW
- delay(2000);
- }
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