Air724ugLora/demo/peripheral/重力加速度/ADXL345/ADXL345.lua

PROJECT = "sensor"
VERSION = "1.0.0"

require "log"
require "sys"
require "misc"

-- i2c ID
i2cid = 2

-- i2c 速率
speed = 100000

---ADXL345所用寄存器地址

local ADXL345_DATA_FORMAT = 0x31 -- 测量范围,正负16g，13位模式
local ADXL345_BW_RATE = 0x2C -- 速率设定为12.5
local ADXL345_POWER_CTL = 0x2D -- 选择电源模式
local ADXL345_INT_ENABLE = 0x2E -- 使能 DATA_READY 中断
local ADXL345_OFSX = 0x1E -- X 偏移量
local ADXL345_OFSY = 0x1F -- Y 偏移量
local ADXL345_OFSZ = 0x20 -- Z 偏移量

local ADXL345_RA_ACCEL_XOUT_H = 0x32
local ADXL345_RA_ACCEL_XOUT_L = 0x33
local ADXL345_RA_ACCEL_YOUT_H = 0x34
local ADXL345_RA_ACCEL_YOUT_L = 0x35
local ADXL345_RA_ACCEL_ZOUT_H = 0x36
local ADXL345_RA_ACCEL_ZOUT_L = 0x37

-- 初始化
function init(address)
    if i2c.setup(i2cid, speed, address) ~= speed then
        log.error("i2c", "setup fail", addr)
        return
    end
    addr = address

    i2c.send(i2cid, addr, {ADXL345_DATA_FORMAT, 0x0B})
    i2c.send(i2cid, addr, {ADXL345_BW_RATE, 0x08})
    i2c.send(i2cid, addr, {ADXL345_POWER_CTL, 0x08})
    i2c.send(i2cid, addr, {ADXL345_INT_ENABLE, 0x80})
    i2c.send(i2cid, addr, {ADXL345_OFSX, 0x00})
    i2c.send(i2cid, addr, {ADXL345_OFSY, 0x00})
    i2c.send(i2cid, addr, {ADXL345_OFSZ, 0x05})

    log.info("i2c init_ok")
end

-- 获取加速度计的原始数据
local function ADXL345_get_accel_raw()
    local accel = {x = nil, y = nil, z = nil}
    i2c.send(i2cid, addr, ADXL345_RA_ACCEL_XOUT_H) -- 获取的地址
    local x = i2c.recv(i2cid, addr, 2) -- 获取2字节
    _, accel.x = pack.unpack(x, ">h")
    i2c.send(i2cid, addr, ADXL345_RA_ACCEL_YOUT_H) -- 获取的地址
    local y = i2c.recv(i2cid, addr, 2) -- 获取2字节
    _, accel.y = pack.unpack(y, ">h")
    i2c.send(i2cid, addr, ADXL345_RA_ACCEL_ZOUT_H) -- 获取的地址
    local z = i2c.recv(i2cid, addr, 2) -- 获取2字节
    _, accel.z = pack.unpack(z, ">h")
    return accel or 0
end

-- adxl345
sys.taskInit(function()
    sys.wait(8000)
    init(0x53)
    while true do
        local test1 = ADXL345_get_accel_raw()
        log.info("ADXL345acceltest", "accel.x", test1.x, "accel.y", test1.y, "accel.z", test1.z)
        sys.wait(1000)
    end
end)