script/libs/pca9555.lua

   1 --[[
   2
   3 @module pca9555
   4 @summary pca9555 IO扩展
   5 @version 1.0
   6 @date    2024/1/15
   7 @author  小牛
   8 @usage
   9     i2c.setup(0, i2c.FAST)
  10     pca9555.setup(0, 0x20, 0x0000)
  11     for i=0,7 do
  12         pca9555.pin(i,0)
  13     end
  14 ]]
  15
  16 local pca9555 = {}
  17
  18 local PCA9555_i2cid=0
  19 local PCA9555_addr=0x20
  20 local PCA9555_mode=0x0000 --IO全为输出
  21 local PCA9555_IOstart=0xffff
  22
  23 -- pca9555 registers define
  24 local PCA9555_REG_IN0 = 0x00                  --输入端口寄存器0 默认值由外部逻辑决定 只可读不可写
  25 local PCA9555_REG_IN1 = 0x01                  --输入端口寄存器1 默认值由外部逻辑决定 只可读不可写
  26 local PCA9555_REG_OUT0 = 0x02                 --输出端口寄存器0 默认值为1 可读可写
  27 local PCA9555_REG_OUT1 = 0x03                 --输入端口寄存器1 默认值为1 可读可写
  28 local PCA9555_REG_POL0 = 0x04                 --极性反转寄存器0 默认值为0 可读可写
  29 local PCA9555_REG_POL1 = 0x05                 --极性反转寄存器1 默认值为0 可读可写
  30 local PCA9555_REG0_CFG0 = 0x06                --配置端口寄存器0 默认为1 可读可写
  31 local PCA9555_REG1_CFG1 = 0x07                --配置端口寄存器1 默认为1 可读可写
  32
  33 --[[
  34 配置寄存器说明          1为输入模式     0为输出模式
  35 Config registers
  36 ---------------------------------------------------------------------------------------
  37 Config          prot 0 register
  38 Bit                   7       6       5       4       3       2       1
  39 Symbol              C0.7    C0.6    C0.5    C0.4    C0.3    C0.2    C0.0
  40 Default               1       1       1       1       1       1       1
  41 ---------------------------------------------------------------------------------------
  42 Config          prot 1 register
  43 Bit                   7       6       5       4       3       2       1
  44 Symbol              C1.7    C1.6    C1.5    C1.4    C1.3    C1.2    C1.0
  45 Default               1       1       1       1       1       1       1
  46 ---------------------------------------------------------------------------------------
  47 ]]
  48
  49 --[[
  50 pca9555初始化
  51 @api pca955.setup(i2cid, addr,mode)
  52 @number i2cid 所在的i2c总线
  53 @number addr pca9555设备的i2c地址
  54 @number mode 配置输入输出模式  --0xffff 高八位配置IO 17-10 低八位配置IO 7-0
  55 @return 初始化失败，返回nil
  56 @usage
  57     i2c.setup(0, i2c.FAST)
  58     pca9555.setup(0,0x20,0xffff)
  59 ]]
  60 function pca9555.setup(i2cid,addr,mode)
  61     PCA9555_i2cid=i2cid
  62     PCA9555_addr=addr
  63     PCA9555_mode=mode
  64     readEncoder()
  65     local tmp=i2c.readReg(PCA9555_i2cid, PCA9555_addr, 0x02, 2)
  66     if tmp==nil then
  67         log.info("PCA9555初始化失败")
  68         return nil
  69     end
  70     if  PCA9555_mode~=nil  then
  71         i2c.writeReg(PCA9555_i2cid,PCA9555_addr,0x06,pack.pack("<H",PCA9555_mode))
  72         i2c.writeReg(PCA9555_i2cid,PCA9555_addr,0x02,pack.pack("<H",PCA9555_IOstart))
  73     else
  74         local recvData=i2c.readReg(PCA9555_i2cid, PCA9555_addr,0x00,2)
  75         _,recvData=pack.unpack(recvData,"<H")
  76         log.info("pca9555默认为完全输入模式",recvData)
  77     end
  78 end
  79
  80 --[[
  81 pca9555 pin控制
  82 @api pca9555.pin(pin,val)
  83 @number pin 引脚 0-7 10-17
  84 @number val 高/低电平 1/0
  85 @return number 如果val未填,则读取pin的输出电平
  86 @usage
  87     for i=0,7 do
  88         pca9555.pin(i,0)
  89     end
  90 ]]
  91 function pca9555.pin(pin,val)
  92     if pin==nil then
  93         log.info("请选择引脚")
  94     elseif pin then
  95         if val==nil then
  96             if pin>9 then
  97                 pin=pin-2
  98             end
  99             local tmp=i2c.readReg(PCA9555_i2cid, PCA9555_addr,0x00,2)
 100             _,tmp=pack.unpack(tmp,"<H")
 101             val=(tmp&(1<<pin))>>pin
 102             return val
 103         elseif val==0 then
 104             if pin>9 then
 105                 pin=pin-2
 106             end
 107             PCA9555_IOstart=PCA9555_IOstart&(~(1<<pin))
 108             i2c.writeReg(PCA9555_i2cid,PCA9555_addr,0x02,pack.pack("<H",PCA9555_IOstart))
 109         else
 110             if pin>9 then
 111                 pin=pin-2
 112             end
 113             PCA9555_IOstart=PCA9555_IOstart|(1<<pin)
 114             i2c.writeReg(PCA9555_i2cid,PCA9555_addr,0x02,pack.pack("<H",PCA9555_IOstart))
 115         end
 116     end
 117 end
 118
 119 return pca9555