script/libs/sc7a20.lua

   1 --[[
   2 @module sc7a20
   3 @summary sc7a20
   4 @version 1.0
   5 @date    2022.04.11
   6 @author  Dozingfiretruck
   7 @usage
   8 --注意:因使用了sys.wait()所有api需要在协程中使用
   9 -- 用法实例
  10 local sc7a20 = require "sc7a20"
  11 i2cid = 0
  12 i2c_speed = i2c.FAST
  13 sys.taskInit(function()
  14     i2c.setup(i2cid,i2c_speed)
  15     sc7a20.init(i2cid)--初始化,传入i2c_id
  16     while 1 do
  17         local sc7a20_data = sc7a20.get_data()
  18         log.info("sc7a20_data", "sc7a20_data.x"..(sc7a20_data.x),"sc7a20_data.y"..(sc7a20_data.y),"sc7a20_data.z"..(sc7a20_data.z))
  19         sys.wait(1000)
  20     end
  21 end)
  22 ]]
  23
  24
  25 local sc7a20 = {}
  26 local sys = require "sys"
  27 local i2cid
  28
  29 local SC7A20_ADDRESS_ADR                    -- sc7a20设备地址
  30
  31 local SC7A20_ADDRESS_ADR_LOW     =   0x18
  32 local SC7A20_ADDRESS_ADR_HIGH    =   0x19
  33 local SC7A20_CHIP_ID_CHECK       =   0x0f   -- 器件ID检测
  34 local SC7A20_CHIP_ID             =   0x11   -- 器件ID
  35
  36 local SC7A20_REG_CTRL_REG1       =   0x20   -- 控制寄存器1
  37 local SC7A20_REG_CTRL_REG2       =   0x21   -- 控制寄存器2
  38 local SC7A20_REG_CTRL_REG3       =   0x22   -- 控制寄存器3
  39 local SC7A20_REG_CTRL_REG4       =   0x23   -- 控制寄存器4
  40 local SC7A20_REG_CTRL_REG5       =   0x24   -- 控制寄存器5
  41 local SC7A20_REG_CTRL_REG6       =   0x25   -- 控制寄存器6
  42 local SC7A20_REG_REFERENCE       =   0x26   -- 参考寄存器
  43 local SC7A20_REG_STATUS_REG      =   0x27   -- 状态寄存器
  44 local SC7A20_REG_OUT_X_L         =   0x28   -- X轴数据低字节
  45 local SC7A20_REG_OUT_X_H         =   0x29   -- X轴数据高字节
  46 local SC7A20_REG_OUT_Y_L         =   0x2A   -- Y轴数据低字节
  47 local SC7A20_REG_OUT_Y_H         =   0x2B   -- Y轴数据高字节
  48 local SC7A20_REG_OUT_Z_L         =   0x2C   -- Z轴数据低字节
  49 local SC7A20_REG_OUT_Z_H         =   0x2D   -- Z轴数据高字节
  50 local SC7A20_REG_FIFO_CTRL_REG   =   0x2E   -- FIFO控制寄存器
  51 local SC7A20_REG_FIFO_SRC_REG    =   0x2F   -- FIFO源寄存器
  52 local SC7A20_REG_INT1_CFG        =   0x30   -- 中断1配置寄存器
  53 local SC7A20_REG_INT1_SRC        =   0x31   -- 中断1源寄存器
  54 local SC7A20_REG_INT1_THS        =   0x32   -- 中断1阈值寄存器
  55 local SC7A20_REG_INT1_DURATION   =   0x33   -- 中断1持续时间寄存器
  56 local SC7A20_REG_INT2_CFG        =   0x34   -- 中断2配置寄存器
  57 local SC7A20_REG_INT2_SRC        =   0x35   -- 中断2源寄存器
  58 local SC7A20_REG_INT2_THS        =   0x36   -- 中断2阈值寄存器
  59 local SC7A20_REG_INT2_DURATION   =   0x37   -- 中断2持续时间寄存器
  60 local SC7A20_REG_CLICK_CFG       =   0x38   -- 单击配置寄存器
  61 local SC7A20_REG_CLICK_SRC       =   0x39   -- 单击源寄存器
  62 local SC7A20_REG_CLICK_THS       =   0x3A   -- 单击阈值寄存器
  63 local SC7A20_REG_TIME_LIMIT      =   0x3B   -- 单击时间限制寄存器
  64 local SC7A20_REG_TIME_LATENCY    =   0x3C   -- 单击时间延迟寄存器
  65 local SC7A20_REG_TIME_WINDOW     =   0x3D   -- 单击时间窗口寄存器
  66 local SC7A20_REG_ACT_THS         =   0x3E   -- 活动阈值寄存器
  67 local SC7A20_REG_ACT_DUR         =   0x3F   -- 活动持续时间寄存器
  68
  69
  70 --器件ID检测
  71 local function chip_check()
  72     i2c.send(i2cid, SC7A20_ADDRESS_ADR_LOW, SC7A20_CHIP_ID_CHECK)--读器件地址
  73     local revData = i2c.recv(i2cid, SC7A20_ADDRESS_ADR_LOW, 1)
  74     if revData:byte() ~= nil then
  75         SC7A20_ADDRESS_ADR = SC7A20_ADDRESS_ADR_LOW
  76     else
  77         i2c.send(i2cid, SC7A20_ADDRESS_ADR_HIGH, SC7A20_CHIP_ID_CHECK)--读器件地址
  78         sys.wait(50)
  79         local revData = i2c.recv(i2cid, SC7A20_ADDRESS_ADR_HIGH, 1)
  80         if revData:byte() ~= nil then
  81             SC7A20_ADDRESS_ADR = SC7A20_ADDRESS_ADR_HIGH
  82         else
  83             log.info("i2c", "Can't find sc7a20 device")
  84             return false
  85         end
  86     end
  87     i2c.send(i2cid, SC7A20_ADDRESS_ADR, SC7A20_CHIP_ID_CHECK)--读器件地址
  88     sys.wait(50)
  89     local revData = i2c.recv(i2cid, SC7A20_ADDRESS_ADR, 1)
  90     if revData:byte() == SC7A20_CHIP_ID then
  91         log.info("Device i2c id is: SC7A20")
  92     else
  93         log.info("i2c", "Can't find sc7a20 device")
  94         return false
  95     end
  96     return true
  97 end
  98
  99
 100 --[[
 101 sc7a20 初始化
 102 @api sc7a20.init(i2c_id)
 103 @number i2c id
 104 @return bool   成功返回true
 105 @usage
 106 sc7a20.init(0)
 107 ]]
 108 function sc7a20.init(i2c_id)
 109     i2cid = i2c_id
 110     sys.wait(20)--20 毫秒等待设备稳定
 111     if chip_check() then
 112         i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG1,0X47})
 113         i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG2,0X00})
 114         i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG3,0X00})
 115         i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG4,0X88})
 116         i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG6,0X00})
 117         log.info("sc7a20 init_ok")
 118         sys.wait(20)
 119         return true
 120     end
 121     return false
 122 end
 123
 124 --[[
 125 获取 sc7a20 数据
 126 @api sc7a20.get_data()
 127 @return table sc7a20 数据
 128 @usage
 129 local sc7a20_data = sc7a20.get_data()
 130 log.info("sc7a20_data", "sc7a20_data.x"..(sc7a20_data.x),"sc7a20_data.y"..(sc7a20_data.y),"sc7a20_data.z"..(sc7a20_data.z))
 131 ]]
 132 function sc7a20.get_data()
 133     local accel={x=nil,y=nil,z=nil}
 134     i2c.send(i2cid, SC7A20_ADDRESS_ADR,SC7A20_REG_OUT_X_L)
 135     _,accel.x = pack.unpack(i2c.recv(i2cid, SC7A20_ADDRESS_ADR, 2),">h")
 136     i2c.send(i2cid, SC7A20_ADDRESS_ADR,SC7A20_REG_OUT_Y_L)
 137     _,accel.y = pack.unpack(i2c.recv(i2cid, SC7A20_ADDRESS_ADR, 2),">h")
 138     i2c.send(i2cid, SC7A20_ADDRESS_ADR,SC7A20_REG_OUT_Z_L)
 139     _,accel.z = pack.unpack(i2c.recv(i2cid, SC7A20_ADDRESS_ADR, 2),">h")
 140     return accel
 141 end
 142
 143
 144 --[[
 145 设置 sc7a20 活动阀值
 146 @api sc7a20.set_thresh (i2cid, activity, time_inactivity)
 147 @number i2c id
 148 @number 活动阀值
 149 @number 活动持续时间
 150 @usage
 151 sc7a20.set_thresh(0, string.char(0x05), string.char(0x05))
 152 ]]
 153 function sc7a20.set_thresh(i2cid, activity, time_inactivity)
 154     i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_ACT_THS, activity)
 155     i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_ACT_DUR, time_inactivity)
 156 end
 157
 158
 159 --[[
 160 设置 sc7a20 中断设置
 161 @api sc7a20.set_irqf(i2cid, int, irqf_ths, irqf_duration, irqf_cfg)
 162 @number i2c id
 163 @number 中断脚 传入1及配置INT1脚，传入2及配置INT2脚
 164 @number 中断阀值
 165 @number 中断持续时间
 166 @number 中断配置
 167 @usage
 168 sc7a20.set_irqf(0, 1, string.char(0x05), string.char(0x05), string.char(0x00))
 169 ]]
 170 function sc7a20.set_irqf(i2cid, int, irqf_ths, irqf_duration, irqf_cfg)
 171     if int == 1 then
 172         i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG3,0X40})        -- AOI1中断映射到INT1上
 173         i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT1_THS, irqf_ths)
 174         i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT1_DURATION, irqf_duration)
 175         i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT1_CFG, irqf_cfg)
 176     elseif int == 2 then
 177         i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG6,0X42})        -- AOI2中断映射到INT2上 并且配置低电平触发中断
 178         i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT2_THS, irqf_ths)
 179         i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT2_DURATION, irqf_duration)
 180         i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT2_CFG, irqf_cfg)
 181     else
 182         log.info("sc7a20", "int Parameter error")
 183     end
 184 end
 185
 186
 187 return sc7a20
 188
 189