51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
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#include "PortWrite_MCP23S17.h"
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void PortWrite_MCP23S17::writePort(const uint8_t registerAddr, const uint8_t data)
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{
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//slower clock
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//SPI.beginTransaction(SPISettings (SPI_CLOCK_DIV8, MSBFIRST, SPI_MODE0)); //control SPI bus todo move to begin()
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digitalWrite(SS, LOW); //enable Slave Select
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SPI.transfer(port.ADDR << 1); //write command
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SPI.transfer(registerAddr); //register address to write data to
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SPI.transfer(data); //data
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digitalWrite(SS, HIGH); //disable Slave Select
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//SPI.endTransaction(); //release the SPI bus
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}
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/*
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If PortRead_MCP23S17 is instantiated on the same port, do NOT use PortWrite_MCP23S17::begin().
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Otherwise readPins could be overwritten.
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Output pins can be used for strobe pins and LEDs.
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SPI.endTransaction() is not called because keyboard only has one SPI device, so no need to release the SPI bus
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*/
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void PortWrite_MCP23S17::begin()
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{
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pinMode(SS, OUTPUT); //configure controller's Slave Select pin to output
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digitalWrite(SS, HIGH); //disable Slave Select
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SPI.begin();
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SPI.beginTransaction(SPISettings (SPI_CLOCK_DIV8, MSBFIRST, SPI_MODE0)); //control SPI bus
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writePort(port.num, 0); //configure port direction (port.num) to output (0)
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}
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/*
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pin is bitwise, where pin being strobed is 1.
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strobe is HIGH or LOW (for active high or active low).
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port.outputVal can be shared by LEDs.
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The functions does not reset the other pins so that they can be used for LEDs.
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*/
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void PortWrite_MCP23S17::write(const uint8_t pin, const bool strobe)
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{
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if (strobe == LOW) //if active low
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{
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port.outputVal &= ~pin; //set pin output to low
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}
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else //if active high
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{
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port.outputVal |= pin; //set pin output to high
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}
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writePort(port.num + 0x12, port.outputVal); //set GPIO port pins for stobe and LEDs
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}
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