--[[ @module sc7a20 @summary sc7a20 @version 1.0 @date 2022.04.11 @author Dozingfiretruck @usage --注意:因使用了sys.wait()所有api需要在协程中使用 -- 用法实例 local sc7a20 = require "sc7a20" i2cid = 0 i2c_speed = i2c.FAST sys.taskInit(function() i2c.setup(i2cid,i2c_speed) sc7a20.init(i2cid)--初始化,传入i2c_id while 1 do local sc7a20_data = sc7a20.get_data() log.info("sc7a20_data", "sc7a20_data.x"..(sc7a20_data.x),"sc7a20_data.y"..(sc7a20_data.y),"sc7a20_data.z"..(sc7a20_data.z)) sys.wait(1000) end end) ]] local sc7a20 = {} local sys = require "sys" local i2cid local SC7A20_ADDRESS_ADR -- sc7a20设备地址 local SC7A20_ADDRESS_ADR_LOW = 0x18 local SC7A20_ADDRESS_ADR_HIGH = 0x19 local SC7A20_CHIP_ID_CHECK = 0x0f -- 器件ID检测 local SC7A20_CHIP_ID = 0x11 -- 器件ID local SC7A20_REG_CTRL_REG1 = 0x20 -- 控制寄存器1 local SC7A20_REG_CTRL_REG2 = 0x21 -- 控制寄存器2 local SC7A20_REG_CTRL_REG3 = 0x22 -- 控制寄存器3 local SC7A20_REG_CTRL_REG4 = 0x23 -- 控制寄存器4 local SC7A20_REG_CTRL_REG5 = 0x24 -- 控制寄存器5 local SC7A20_REG_CTRL_REG6 = 0x25 -- 控制寄存器6 local SC7A20_REG_REFERENCE = 0x26 -- 参考寄存器 local SC7A20_REG_STATUS_REG = 0x27 -- 状态寄存器 local SC7A20_REG_OUT_X_L = 0x28 -- X轴数据低字节 local SC7A20_REG_OUT_X_H = 0x29 -- X轴数据高字节 local SC7A20_REG_OUT_Y_L = 0x2A -- Y轴数据低字节 local SC7A20_REG_OUT_Y_H = 0x2B -- Y轴数据高字节 local SC7A20_REG_OUT_Z_L = 0x2C -- Z轴数据低字节 local SC7A20_REG_OUT_Z_H = 0x2D -- Z轴数据高字节 local SC7A20_REG_FIFO_CTRL_REG = 0x2E -- FIFO控制寄存器 local SC7A20_REG_FIFO_SRC_REG = 0x2F -- FIFO源寄存器 local SC7A20_REG_INT1_CFG = 0x30 -- 中断1配置寄存器 local SC7A20_REG_INT1_SRC = 0x31 -- 中断1源寄存器 local SC7A20_REG_INT1_THS = 0x32 -- 中断1阈值寄存器 local SC7A20_REG_INT1_DURATION = 0x33 -- 中断1持续时间寄存器 local SC7A20_REG_INT2_CFG = 0x34 -- 中断2配置寄存器 local SC7A20_REG_INT2_SRC = 0x35 -- 中断2源寄存器 local SC7A20_REG_INT2_THS = 0x36 -- 中断2阈值寄存器 local SC7A20_REG_INT2_DURATION = 0x37 -- 中断2持续时间寄存器 local SC7A20_REG_CLICK_CFG = 0x38 -- 单击配置寄存器 local SC7A20_REG_CLICK_SRC = 0x39 -- 单击源寄存器 local SC7A20_REG_CLICK_THS = 0x3A -- 单击阈值寄存器 local SC7A20_REG_TIME_LIMIT = 0x3B -- 单击时间限制寄存器 local SC7A20_REG_TIME_LATENCY = 0x3C -- 单击时间延迟寄存器 local SC7A20_REG_TIME_WINDOW = 0x3D -- 单击时间窗口寄存器 local SC7A20_REG_ACT_THS = 0x3E -- 活动阈值寄存器 local SC7A20_REG_ACT_DUR = 0x3F -- 活动持续时间寄存器 --器件ID检测 local function chip_check() i2c.send(i2cid, SC7A20_ADDRESS_ADR_LOW, SC7A20_CHIP_ID_CHECK)--读器件地址 local revData = i2c.recv(i2cid, SC7A20_ADDRESS_ADR_LOW, 1) if revData:byte() ~= nil then SC7A20_ADDRESS_ADR = SC7A20_ADDRESS_ADR_LOW else i2c.send(i2cid, SC7A20_ADDRESS_ADR_HIGH, SC7A20_CHIP_ID_CHECK)--读器件地址 sys.wait(50) local revData = i2c.recv(i2cid, SC7A20_ADDRESS_ADR_HIGH, 1) if revData:byte() ~= nil then SC7A20_ADDRESS_ADR = SC7A20_ADDRESS_ADR_HIGH else log.info("i2c", "Can't find sc7a20 device") return false end end i2c.send(i2cid, SC7A20_ADDRESS_ADR, SC7A20_CHIP_ID_CHECK)--读器件地址 sys.wait(50) local revData = i2c.recv(i2cid, SC7A20_ADDRESS_ADR, 1) if revData:byte() == SC7A20_CHIP_ID then log.info("Device i2c id is: SC7A20") else log.info("i2c", "Can't find sc7a20 device") return false end return true end --[[ sc7a20 初始化 @api sc7a20.init(i2c_id) @number i2c id @return bool 成功返回true @usage sc7a20.init(0) ]] function sc7a20.init(i2c_id) i2cid = i2c_id sys.wait(20)--20 毫秒等待设备稳定 if chip_check() then i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG1,0X47}) i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG2,0X00}) i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG3,0X00}) i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG4,0X88}) i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG6,0X00}) log.info("sc7a20 init_ok") sys.wait(20) return true end return false end --[[ 获取 sc7a20 数据 @api sc7a20.get_data() @return table sc7a20 数据 @usage local sc7a20_data = sc7a20.get_data() log.info("sc7a20_data", "sc7a20_data.x"..(sc7a20_data.x),"sc7a20_data.y"..(sc7a20_data.y),"sc7a20_data.z"..(sc7a20_data.z)) ]] function sc7a20.get_data() local accel={x=nil,y=nil,z=nil} i2c.send(i2cid, SC7A20_ADDRESS_ADR,SC7A20_REG_OUT_X_L) _,accel.x = pack.unpack(i2c.recv(i2cid, SC7A20_ADDRESS_ADR, 2),">h") i2c.send(i2cid, SC7A20_ADDRESS_ADR,SC7A20_REG_OUT_Y_L) _,accel.y = pack.unpack(i2c.recv(i2cid, SC7A20_ADDRESS_ADR, 2),">h") i2c.send(i2cid, SC7A20_ADDRESS_ADR,SC7A20_REG_OUT_Z_L) _,accel.z = pack.unpack(i2c.recv(i2cid, SC7A20_ADDRESS_ADR, 2),">h") return accel end --[[ 设置 sc7a20 活动阀值 @api sc7a20.set_thresh (i2cid, activity, time_inactivity) @number i2c id @number 活动阀值 @number 活动持续时间 @usage sc7a20.set_thresh(0, string.char(0x05), string.char(0x05)) ]] function sc7a20.set_thresh(i2cid, activity, time_inactivity) i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_ACT_THS, activity) i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_ACT_DUR, time_inactivity) end --[[ 设置 sc7a20 中断设置 @api sc7a20.set_irqf(i2cid, int, irqf_ths, irqf_duration, irqf_cfg) @number i2c id @number 中断脚 传入1及配置INT1脚，传入2及配置INT2脚 @number 中断阀值 @number 中断持续时间 @number 中断配置 @usage sc7a20.set_irqf(0, 1, string.char(0x05), string.char(0x05), string.char(0x00)) ]] function sc7a20.set_irqf(i2cid, int, irqf_ths, irqf_duration, irqf_cfg) if int == 1 then i2c.send(i2cid, SC7A20_ADDRESS_ADR, {SC7A20_REG_CTRL_REG3,0X40}) -- AOI1中断映射到INT1上 i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT1_THS, irqf_ths) i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT1_DURATION, irqf_duration) i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT1_CFG, irqf_cfg) elseif int == 2 then 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 i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT2_THS, irqf_ths) i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT2_DURATION, irqf_duration) i2c.writeReg(i2cid, SC7A20_ADDRESS_ADR, SC7A20_REG_INT2_CFG, irqf_cfg) else log.info("sc7a20", "int Parameter error") end end return sc7a20