--- 模块功能：MCP23017 --- Author JWL 参考STM32 https://blog.csdn.net/lnniyunlong99/article/details/107728094 module(..., package.seeall) require "utils" require "sys" require "pins" local MCP23017_IODIR = 0x00 local MCP23017_IPOL = 0x02 local MCP23017_GPINTEN = 0x04 local MCP23017_DEFVAL = 0x06 local MCP23017_INTCON = 0x08 local MCP23017_IOCON = 0x0A local MCP23017_GPPU = 0x0C local MCP23017_INTF = 0x0E local MCP23017_INTCAP = 0x10 local MCP23017_GPIO = 0x12 local MCP23017_OLAT = 0x14 local MCP23017_PORTA = 0x00 local MCP23017_PORTB = 0x01 local INPUT = 0x01 local OUTPUT = 0x00 local ENABLE = 0x01 local DISABLE = 0x00 local SET = 0x01 local RESET = 0x00 local POLARITY_REVERSE = 0x01 local POLARITY_NON_REVERSE = 0x00 local PIN0 = 0x01 local PIN1 = 0x02 local PIN2 = 0x04 local PIN3 = 0x08 local PIN4 = 0x10 local PIN5 = 0x20 local PIN6 = 0x40 local PIN7 = 0x80 local ALLPIN = 0xFF local DIS_INTERRUPT = 0x00 local HIGHLEVEL_INTERRUPT = 0x01 local LOWLEVEL_INTERRUPT = 0x02 local CHANGE_INTERRUPT = 0x03 local INTA_INTB_CONJUNCTION = 0x00 local INTA_INTB_INDEPENDENT = 0x01 local HWA_EN = 0x00 local HWA_DIS = 0x01 local INT_OD = 0x00 local INT_PUSHPULL_HIGH = 0x01 local INT_PUSHPULL_LOW = 0x02 local I2C_READ = 0x01 local I2C_WRITE = 0x00 local DEV_ID = 0x20 local I2C_ID = 0x02 local function I2C_Open(id) if i2c.setup(id, i2c.SLOW) ~= i2c.SLOW then log.error("MCP23017", "I2C.init is: fail") i2c.close(id) return else log.error("MCP23017", "I2C.init is: succeed") end return i2c.SLOW end local function I2C_Write_Byte_MCP23017(deviceAddr, regAddress,content) local i2cslaveaddr = bit.bor(DEV_ID, deviceAddr) i2c.send(I2C_ID, i2cslaveaddr, {regAddress,content}) end local function I2C_Read_Byte_MCP23017(deviceAddr, regAddress) local i2cslaveaddr =bit.bor(DEV_ID, deviceAddr) i2c.send(I2C_ID, i2cslaveaddr, regAddress) return i2c.recv(I2C_ID, i2cslaveaddr, 1):byte(1) end local function MCP23017_INIT(deviceAddr,intab,hwa,port, o) local state,res; --首先设置其他位的默认状态 state = 0X22; --001011 10,BANK = 0,默认不关联AB（bit = 0）,禁用顺序操作,使能变化率控制、使能硬件地址,开漏输出 if intab==INTA_INTB_CONJUNCTION then state = bit.bor(state,0x40) -- state |= 0x40; end if hwa==HWA_DIS then state = bit.band( state, bit.bnot(0x08)) -- state &= (~0x08); end if o==INT_PUSHPULL_HIGH then state = bit.band(state, bit.bnot(0x04)) -- state &= (~0x04); state = bit.bor(state,0x02) -- state |= 0x02; end if o==INT_PUSHPULL_LOW then state = bit.band(state, bit.bnot(0x04)) -- state &= (~0x04); state = bit.band(state, bit.bnot(0x02)) -- state &= (~0x02); end --写回方向寄存器 res = I2C_Write_Byte_MCP23017(deviceAddr,MCP23017_IOCON +port,state) return res; end local function MCP23017_IO_DIR(deviceAddr,port,pin,dir) local portState = 0x00 --首先读取当前端口方向的配置状态 --因为B端口的地址比A端口的寄存器的地址都是大1，所以采用+的技巧切换寄存器 --portState =I2C_Read_Byte_MCP23017(deviceAddr,MCP23017_IODIR+port); if dir==INPUT then portState = bit.bor(portState, pin) --portState |= pin; else portState = bit.band(portState, bit.bnot(pin)) --portState &= (~pin); end --写回方向寄存器 I2C_Write_Byte_MCP23017(deviceAddr,MCP23017_IODIR+port,portState) end local function MCP23017_IO_PU(deviceAddr,port,pin,pu) local portState = 0x00 if pu==ENABLE then portState = bit.bor(portState,pin) -- portState |= pin; else portState = bit.band(portState, bit.bnot(pin)) --portState &= (~pin); end I2C_Write_Byte_MCP23017(deviceAddr,MCP23017_GPPU+port,portState) end local function MCP23017_IO_INT(deviceAddr, port, pin, intKind) local portState_GPINTEN = 0 -- 中断使能寄存器 local portState_DEFVAL = 0 -- 中断默认值寄存器 local portState_INTCON = 0 -- 中断控制寄存器 --首先读取当前配置状态 --因为B端口的地址比A端口的寄存器的地址都是大1，所以采用+的技巧切换寄存器 portState_GPINTEN = I2C_Read_Byte_MCP23017(deviceAddr,MCP23017_GPINTEN +port) portState_DEFVAL = I2C_Read_Byte_MCP23017(deviceAddr,MCP23017_DEFVAL +port) portState_INTCON = I2C_Read_Byte_MCP23017(deviceAddr,MCP23017_INTCON +port) log.info("portState_GPINTEN,portState_DEFVAL,portState_INTCON", portState_GPINTEN,portState_DEFVAL,portState_INTCON) --判断中断的类型 --如果是关闭中断 if intKind==DIS_INTERRUPT then portState_GPINTEN = bit.band(portState_GPINTEN,bit.bnot(pin)) -- portState_GPINTEN &= (~pin); end --如果是变化中断 if intKind==CHANGE_INTERRUPT then portState_GPINTEN = bit.bor(portState_GPINTEN, pin) -- portState_GPINTEN |= pin; portState_INTCON = bit.band(portState_INTCON, bit.bnot(pin)) -- portState_INTCON &= (~pin); end --如果是高电平中断 if intKind==HIGHLEVEL_INTERRUPT then portState_GPINTEN = bit.bor(portState_GPINTEN, pin) -- portState_GPINTEN |= pin; portState_INTCON = bit.bor(portState_INTCON, pin) -- portState_INTCON |= pin; portState_DEFVAL = bit.band(portState_DEFVAL, bit.bnot(pin)) -- portState_DEFVAL &= (~pin); end --如果是低电平中断 if intKind==LOWLEVEL_INTERRUPT then portState_GPINTEN = bit.bor(portState_GPINTEN, pin) -- portState_GPINTEN |= pin; portState_INTCON = bit.bor(portState_INTCON, pin) -- portState_INTCON |= pin; portState_DEFVAL = bit.bor(portState_DEFVAL, pin) -- portState_DEFVAL |= pin; end --写回寄存器 I2C_Write_Byte_MCP23017(deviceAddr,MCP23017_GPINTEN+port,portState_GPINTEN) I2C_Write_Byte_MCP23017(deviceAddr,MCP23017_INTCON+port,portState_INTCON) I2C_Write_Byte_MCP23017(deviceAddr,MCP23017_DEFVAL+port,portState_DEFVAL) end local function MCP23017_WRITE_GPIO(deviceAddr,port,val) I2C_Write_Byte_MCP23017(deviceAddr,MCP23017_GPIO+port,val) end local function MCP23017_READ_GPIO(deviceAddr,port) return I2C_Read_Byte_MCP23017(deviceAddr,MCP23017_GPIO+port) end local flag_interrupt=0 pins.setup( pio.P0_13, function(msg) flag_interrupt = 1 log.info("flag_interrupt, msg", flag_interrupt, msg ) end, pio.PULLUP ) sys.taskInit(function() sys.wait(2000) I2C_Open(I2C_ID) sys.wait(500) --16路输出初始化 MCP23017_INIT(0x00,INTA_INTB_INDEPENDENT,HWA_EN, MCP23017_PORTB,INT_OD) sys.wait(100) MCP23017_IO_DIR(0x00,MCP23017_PORTB,ALLPIN,INPUT) sys.wait(50) MCP23017_IO_PU(0x00,MCP23017_PORTB,ALLPIN,ENABLE) sys.wait(50) MCP23017_IO_INT(0x00,MCP23017_PORTB,ALLPIN,CHANGE_INTERRUPT) sys.wait(2500) local val = MCP23017_READ_GPIO(0x00,MCP23017_PORTB) log.info("port B=",string.format("%02X",val)) while true do --对PORT A 写入高低电平 MCP23017_WRITE_GPIO(0x00,MCP23017_PORTA,0x01) log.info("set high") sys.wait(1000) log.info("set low") MCP23017_WRITE_GPIO(0x00,MCP23017_PORTA,0x00) sys.wait(1000) --读取端口的值日 local val = MCP23017_READ_GPIO(0x00,MCP23017_PORTB) log.info("port B=",string.format("%02X",val)) -- if flag_interrupt ==1 then -- flag_interrupt = 0 -- local val = MCP23017_READ_GPIO(0x00,MCP23017_PORTB) -- log.info("port B=",string.format("%02X",val)) -- else -- sys.wait(2000) -- end sys.wait(2000) end end)