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