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+--[[
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+@module ads1115
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+@summary ads1115 驱动
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+@version 1.0
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+@date 2022.03.18
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+@author Dozingfiretruck
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+@usage
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+--注意:因使用了sys.wait()所有api需要在协程中使用
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+--注意:ads1115的配置需按照项目需求配置,您需要按照配置寄存器说明重新配置 ADS1115_CONF_HCMD 和 ADS1115_CONF_LCMD !!!
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+-- 用法实例
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+local ads1115 = require "ads1115"
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+i2cid = 0
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+i2c_speed = i2c.FAST
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+sys.taskInit(function()
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+ i2c.setup(i2cid,i2c_speed)
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+ ads1115.init(i2cid)--初始化,传入i2c_id
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+ while 1 do
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+ local ads1115_val = ads1115.get_val()
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+ log.info("ads1115 val", ads1115_val)
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+ sys.wait(1000)
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+ end
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+end)
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+]]
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+
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+local ads1115 = {}
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+
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+local sys = require "sys"
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+
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+local i2cid
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+local i2cslaveaddr
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+
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+local ADS1115_ADDRESS_AD0_LOW = 0x48 -- address pin low (GND), default for InvenSense evaluation board
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+local ADS1115_ADDRESS_AD0_HIGH = 0x49 -- address pin high (VCC)
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+local ADS1115_ADDRESS_AD0_SDA = 0x4A
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+local ADS1115_ADDRESS_AD0_SCL = 0x4B
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+
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+-- ADS1115 registers define
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+local ADS1115_DATA_REG = 0x00 --转换寄存器
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+local ADS1115_CONF_REG = 0x01 --配置寄存器
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+local ADS1115_LOTH_REG = 0x02 --阈值比较器高字节寄存器
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+local ADS1115_HITH_REG = 0x03 --阈值比较器低字节寄存器
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+
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+--[[
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+配置寄存器说明
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+config register
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+-----------------------------------------------------------------------------------
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+CRH[15:8](R/W)
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+BIT 15 14 13 12 11 10 9 8
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+NAME OS MUX2 MUX1 MUX0 PGA2 PGA1 PGA0 MODE
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+-----------------------------------------------------------------------------------
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+L[7:0] (R/W)
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+BIT 7 6 5 4 3 2 1 0
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+NAME DR0 DR1 DR0 COM_MODE COM_POL COM_LAT COM_QUE1 COM_QUE0
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+-----------------------------------------------------------------------------------
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+15 | OS | 运行状态和单次转换开始
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+ | | 写时:
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+ | | 0 : 无效
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+ | | 1 : 开始单次转换(处于掉电状态时)
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+ | | 读时:
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+ | | 0 : 正在转换
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+ | | 1 : 未执行转换
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+-----------------------------------------------------------------------------------
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+14:12 | MUX [2:0] | 输入复用多路配置
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+ | | 000 : AINP = AIN0 and AINN = AIN1 (default)
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+ | | 001 : AINP = AIN0 and AINN = AIN3
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+ | | 010 : AINP = AIN1 and AINN = AIN3
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+ | | 011 : AINP = AIN2 and AINN = AIN3
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+ | | 100 : AINP = AIN0 and AINN = GND
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+ | | 101 : AINP = AIN1 and AINN = GND
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+ | | 110 : AINP = AIN2 and AINN = GND
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+ | | 111 : AINP = AIN3 and AINN = GND
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+-----------------------------------------------------------------------------------
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+11:9 | PGA [2:0] | 可编程增益放大器配置(FSR full scale range)
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+ | | 000 : FSR = В±6.144 V
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+ | | 001 : FSR = В±4.096 V
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+ | | 010 : FSR = В±2.048 V (默认)
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+ | | 011 : FSR = В±1.024 V
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+ | | 100 : FSR = В±0.512 V
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+ | | 101 : FSR = В±0.256 V
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+ | | 110 : FSR = В±0.256 V
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+ | | 111 : FSR = В±0.256 V
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+-----------------------------------------------------------------------------------
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+8 | MODE | 工作模式
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+ | | 0 : 连续转换
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+ | | 1 : 单次转换
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+-----------------------------------------------------------------------------------
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+7:5 | DR [2:0] | 采样频率
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+ | | 000 : 8 SPS
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+ | | 001 : 16 SPS
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+ | | 010 : 32 SPS
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+ | | 011 : 64 SPS
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+ | | 100 : 128 SPS (默认)
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+ | | 101 : 250 SPS
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+ | | 110 : 475 SPS
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+ | | 111 : 860 SPS
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+-----------------------------------------------------------------------------------
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+4 | COMP_MODE | 比较器模式
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+ | | 0 : 传统比较器 (default)
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+ | | 1 : 窗口比较器
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+-----------------------------------------------------------------------------------
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+3 | COMP_POL | Comparator polarity
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+ | | 0 : 低电平有效 (default)
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+ | | 1 : 高电平有效
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+-----------------------------------------------------------------------------------
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+2 | COMP_LAT | Latching comparator
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+ | | 0 : 非锁存比较器. (default)
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+ | | 1 : 锁存比较器.
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+-----------------------------------------------------------------------------------
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+1:0 | COMP_QUE [1:0] | Comparator queue and disable
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+ | | 00 : Assert after one conversion
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+ | | 01 : Assert after two conversions
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+ | | 10 : Assert after four conversions
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+ | | 11 : 禁用比较器并将ALERT/RDY设置为高阻抗 (default)
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+-----------------------------------------------------------------------------------
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+]]
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+
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+local ADS1115_CONF_HCMD = 0x42 -- AIN0单端输入 В±4.096 V 连续模式 0 100 001 0
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+local ADS1115_CONF_LCMD = 0x83 -- 128sps 传统比较器 输出低有效 非锁存比较器 禁用比较器并将ALERT/RDY设置为高阻抗 100 0 0 0 11
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+
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+--[[
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+ADS1115初始化
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+@api ADS1115.init(i2c_id)
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+@number i2c_id i2c_id
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+@return bool 成功返回true
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+@usage
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+ADS1115.init(0)
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+]]
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+function ads1115.init(i2c_id)
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+ i2cid = i2c_id
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+ -- i2cslaveaddr = ADS1115_ADDRESS_AD0_LOW
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+ log.info("ADS1115 init_ok")
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+ return true
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+end
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+
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+-- --[[
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+-- 获取ADS1115数据
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+-- @api ADS1115.get_data()
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+-- @return number 光照强度数据
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+-- @usage
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+-- local ADS1115_data = ADS1115.read_light()
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+-- log.info("ADS1115_read_light", ADS1115_data)
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+-- ]]
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+function ads1115.get_val()
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+ i2c.send(i2cid, ADS1115_ADDRESS_AD0_LOW,{ADS1115_CONF_REG,ADS1115_CONF_HCMD,ADS1115_CONF_LCMD})
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+ sys.wait(5)
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+ i2c.send(i2cid, ADS1115_ADDRESS_AD0_LOW, ADS1115_DATA_REG)
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+ local _,val_data_raw = pack.unpack(i2c.recv(i2cid, ADS1115_ADDRESS_AD0_LOW, 2), ">h")
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+ if val_data_raw>=0x8000 then
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+ return ((0xffff-val_data_raw)/32767.0)*4.096
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+ else
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+ return (val_data_raw/32768.0)*4.096
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+ end
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+end
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+
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+return ads1115
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+
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+
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+
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+
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Dozingfiretruck