update script/libs/ads1115plus.lua.

Signed-off-by: 杨壮壮 <1014708854@qq.com>

script/libs/ads1115plus.lua

@@ -0,0 +1,167 @@
+--[[
+@module  ads1115plus
+@summary ADS1115驱动
+测量2次，逼近量程测量方案
+可以用8种通道方式,4种差分，4种in0-in3
+ads1115完全驱动
+@version 1.0
+@data    2023/12/14
+@author  杨壮壮
+@usage
+require 'ads1115plus'
+sys.taskInit(function ()
+	i2c.setup(i2cid, i2c_speed)
+    ads1115plus.Setup(i2cid) -- 一次初始化
+	
+	while true do
+		log.info("ads1115:",ads1115plus.task_read(5))
+		sys.wait(1000)
+	end
+
+end)
+]]
+
+
+require 'sys'
+
+_G.sys = require ("sys")
+
+
+
+
+
+
+ads1115plus = {}    --定义存放程序的TABLE 全局变量
+
+local i2cid=1
+local i2cslaveaddr = 0x48
+
+
+--[[
+ADS1115初始化
+@api ads1115plus.Setup(i2c_id)
+@number 所在的i2c总线id
+@return bool   成功返回true
+@usage
+i2c.setup(0, i2c_speed)
+ads1115plus.Setup(0)
+]]
+
+function ads1115plus.Setup(i2c_id)
+    i2cid=i2c_id
+    i2c.writeReg(i2cid, i2cslaveaddr, 0x02, string.char(0x00, 0x00)) --给低阈值寄存器写进去值 A1高八位 A2 低八位
+    i2c.writeReg(i2cid, i2cslaveaddr, 0x03, string.char(0xff, 0xff)) --给高阈值寄存器写进去值 A1高八位 A2 低八位
+    log.info("ADS1115", "init_ok")
+    return true
+end
+
+
+
+--[[
+获取ADS1115原始数据
+@api ads1115plus.task_recv(MU1,FSR)
+@number MUX：通道选择 0-7  MUX=0 AIN0 AIN1   MUX=7 AIN3 GND
+MU1
+    |                | 000 : AINP = AIN0 and AINN = AIN1 (default)
+    |                | 001 : AINP = AIN0 and AINN = AIN3
+    |                | 010 : AINP = AIN1 and AINN = AIN3
+    |                | 011 : AINP = AIN2 and AINN = AIN3
+    |                | 100 : AINP = AIN0 and AINN = GND
+    |                | 101 : AINP = AIN1 and AINN = GND
+    |                | 110 : AINP = AIN2 and AINN = GND
+    |                | 111 : AINP = AIN3 and AINN = GND
+
+
+@number FSR：量程选择 0-7   2 2.048v 
+-- 这个参数的选择：8.1:噪声性能
+FSR
+    |                | 000 : FSR = В±6.144 V
+    |                | 001 : FSR = В±4.096 V
+    |                | 010 : FSR = В±2.048 V (默认)
+    |                | 011 : FSR = В±1.024 V
+    |                | 100 : FSR = В±0.512 V
+    |                | 101 : FSR = В±0.256 V
+    |                | 110 : FSR = В±0.256 V
+    |                | 111 : FSR = В±0.256 V
+
+@return number ADC数据,若读取失败会返回nil
+@usage
+local ads1115_data = ads1115plus.task_recv(0,2)
+log.info("ads1115", ads1115_data)
+]]
+function ads1115plus.task_recv( MU1,FSR )   
+    a1 = 0x80 + (MU1 * 16) + (FSR * 2) + 1  --a1为配置寄存器高八位  a2为低八位
+    if FSR > 0x05 then                  --FSR大于5时，切换速率减少噪声，提高采样数据精确度
+        a2 = (0x3 * 32) + 3               --量程超过5的时候，速率配置为64sps
+        i2c.writeReg(i2cid, i2cslaveaddr, 0x01, string.char(a1, a2)) --给配置寄存器写进去值 A1高八位 A2 低八位
+        sys.wait(60)
+    else
+        a2 = (0x4 * 32) + 3               --其他情况下速率为128sps
+        i2c.writeReg(i2cid, i2cslaveaddr, 0x01, string.char(a1, a2)) --给配置寄存器写进去值 A1高八位 A2 低八位
+        sys.wait(30)
+    end
+    
+    -- 从转换就绪引脚读取转换好的采集数据2个字节（四个十六进制的数值）的数据
+    local data = i2c.readReg(i2cid, i2cslaveaddr,0x00 , 2)  
+
+    local _,val_data_raw = pack.unpack(data, ">h")
+
+    if not val_data_raw then
+        return
+    end
+    if val_data_raw>=0x8000 then
+        return ((0xffff-val_data_raw))
+    else
+        return (val_data_raw)
+    end
+
+end
+
+--[[
+ADS1115读取mv值
+@api ads1115plus.task_read(MU1)
+@number 所在的i2c总线id
+@return number ADC的mv数据,若读取失败会返回nil
+@usage
+log.info("ads1115plus:",ads1115plus.task_read(5))
+]]
+
+
+function ads1115plus.task_read(MU1)
+    local ads = ads1115plus.task_recv(MU1,0) --先用大量程测量正负6.144去测量 逼近
+	if ads == nil then 
+		return nil             --判断采样数值是否非空
+	end
+    local ads_ADC=0
+	if ads < 0 then
+		ads_ADC = -ads
+	else
+		ads_ADC = ads
+	end
+    local mv =0
+	if 	ads_ADC > 10922 then	
+        if ads_ADC>20000 then
+            mv = ads * 0.1875
+        else
+            ads = ads1115plus.task_recv(MU1,1)
+            mv = ads * 0.125
+        end
+		
+	elseif 	ads_ADC > 5461 then	
+		ads = ads1115plus.task_recv(MU1,2)
+		mv = ads * 0.0625
+	elseif 	ads_ADC > 2730 then
+		ads = ads1115plus.task_recv(MU1,3)
+		mv = ads * 0.03125
+	elseif ads_ADC > 1365 then 	
+		ads = ads1115plus.task_recv(MU1,4)
+		mv = ads * 0.015625
+	else
+		ads = ads1115plus.task_recv(MU1,5)
+		mv = ads * 0.0078125
+	end
+	return mv   --返回采集到的电压值 单位（mV）有正有负  
+end
+
+return ads1115plus
+