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- #include "PortMCP23S17.h"
-
- /* transfer() writes data to registerAddr, reads portSate from registerAddr, and returns portState.
- */
- uint8_t PortMCP23S17::transfer(const uint8_t command, const uint8_t registerAddr, const uint8_t data)
- {
- uint8_t portState; //bit pattern
-
- digitalWrite(SS, LOW); //enable Slave Select
- SPI.transfer(command); //write or read command
- SPI.transfer(registerAddr); //register address to write data to
- portState = SPI.transfer(data); //write data, read portState
- digitalWrite(SS, HIGH); //disable Slave Select
-
- return portState;
- }
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