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184 lines
3.8 KiB
184 lines
3.8 KiB
/*
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MCP23S08 MODULE
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Copyright (C) 2020 by Eddi De Pieri <eddi at depieri dot com>
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Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>
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Copyright (C) 2016 Plamen Kovandjiev <p.kovandiev@kmpelectronics.eu> & Dimitar Antonov <d.antonov@kmpelectronics.eu>
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*/
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#include "mcp23s08.h"
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#if MCP23S08_SUPPORT
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#include <SPI.h>
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#include <bitset>
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// TODO: check if this needed for SPI operation
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#define MCP23S08_CS_PIN 15
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// Known commands
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#define READ_CMD 0x41
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#define WRITE_CMD 0x40
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// Registers
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#define IODIR 0x00
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#define IPOL 0x01
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#define GPINTEN 0x02
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#define DEFVAL 0x03
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#define INTCON 0x04
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#define IOCON 0x05
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#define GPPU 0x06
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#define INTF 0x07
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#define INTCAP 0x08
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#define GPIO 0x09
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#define OLAT 0x0A
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static uint8_t _mcp23s08TxData[16] __attribute__((aligned(4)));
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static uint8_t _mcp23s08RxData[16] __attribute__((aligned(4)));
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McpGpioPin::McpGpioPin(unsigned char pin) :
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BasePin(pin)
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{}
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inline void McpGpioPin::pinMode(int8_t mode) {
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::MCP23S08SetDirection(this->pin, mode);
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}
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inline void McpGpioPin::digitalWrite(int8_t val) {
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::MCP23S08SetPin(this->pin, val);
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}
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inline int McpGpioPin::digitalRead() {
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return ::MCP23S08GetPin(this->pin);
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}
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void MCP23S08Setup()
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{
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DEBUG_MSG_P(PSTR("[MCP23S08] Initialize SPI bus\n"));
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// Expander SPI settings
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SPI.begin();
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SPI.setHwCs(true);
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SPI.setFrequency(1000000);
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SPI.setDataMode(SPI_MODE0);
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pinMode(MCP23S08_CS_PIN, OUTPUT);
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digitalWrite(MCP23S08_CS_PIN, HIGH);
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}
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/**
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* @brief Set a expander MCP23S08 the pin direction.
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*
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* @param pinNumber Pin number for set.
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* @param mode direction mode. 0 - INPUT, 1 - OUTPUT.
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*
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* @return void
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*/
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void MCP23S08SetDirection(uint8_t pinNumber, uint8_t mode)
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{
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uint8_t registerData = MCP23S08ReadRegister(IODIR);
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if (INPUT == mode)
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{
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registerData |= (1 << pinNumber);
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}
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else
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{
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registerData &= ~(1 << pinNumber);
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}
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MCP23S08WriteRegister(IODIR, registerData);
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}
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/**
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* @brief Read an expander MCP23S08 a register.
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*
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* @param address A register address.
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*
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* @return The data from the register.
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*/
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uint8_t MCP23S08ReadRegister(uint8_t address)
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{
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_mcp23s08TxData[0] = READ_CMD;
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_mcp23s08TxData[1] = address;
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digitalWrite(MCP23S08_CS_PIN, LOW);
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SPI.transferBytes(_mcp23s08TxData, _mcp23s08RxData, 3);
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digitalWrite(MCP23S08_CS_PIN, HIGH);
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return _mcp23s08RxData[2];
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}
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/**
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* @brief Write data in expander MCP23S08 register.
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*
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* @param address A register address.
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* @param data A byte for write.
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*
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* @return void.
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*/
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void MCP23S08WriteRegister(uint8_t address, uint8_t data)
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{
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_mcp23s08TxData[0] = WRITE_CMD;
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_mcp23s08TxData[1] = address;
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_mcp23s08TxData[2] = data;
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digitalWrite(MCP23S08_CS_PIN, LOW);
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SPI.transferBytes(_mcp23s08TxData, _mcp23s08RxData, 3);
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digitalWrite(MCP23S08_CS_PIN, HIGH);
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}
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/**
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* @brief Set expander MCP23S08 pin state.
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*
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* @param pinNumber The number of pin to be set.
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* @param state The pin state, true - 1, false - 0.
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*
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* @return void
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*/
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void MCP23S08SetPin(uint8_t pinNumber, bool state)
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{
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uint8_t registerData = MCP23S08ReadRegister(OLAT);
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if (state)
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{
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registerData |= (1 << pinNumber);
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}
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else
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{
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registerData &= ~(1 << pinNumber);
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}
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MCP23S08WriteRegister(OLAT, registerData);
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}
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/**
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* @brief Get MCP23S08 pin state.
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*
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* @param pinNumber The number of pin to get.
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*
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* @return State true - 1, false - 0.
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*/
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bool MCP23S08GetPin(uint8_t pinNumber)
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{
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uint8_t registerData = MCP23S08ReadRegister(GPIO);
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return registerData & (1 << pinNumber);
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}
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/**
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* @brief Ensure pin number is valid.
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*
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* @param pinNumber The number of pin to be get.
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*
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* @return State true - 1, false - 0.
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*/
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bool mcpGpioValid(unsigned char gpio)
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{
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return gpio < McpGpioPins;
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}
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#endif // MCP23S08_SUPPORT
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