76 lines
1.8 KiB
Lua
76 lines
1.8 KiB
Lua
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--------------------------------------------------------------------------------
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-- DS3231 I2C module for NODEMCU
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-- NODEMCU TEAM
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-- LICENCE: http://opensource.org/licenses/MIT
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-- Tobie Booth <tbooth@hindbra.in>
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--------------------------------------------------------------------------------
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local moduleName = ...
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local M = {}
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_G[moduleName] = M
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-- Default value for i2c communication
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local id = 0
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--device address
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local dev_addr = 0x68
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local function decToBcd(val)
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return((val/10*16) + (val%10))
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end
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local function bcdToDec(val)
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return((val/16*10) + (val%16))
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end
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-- initialize i2c
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--parameters:
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--d: sda
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--l: scl
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function M.init(d, l)
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if (d ~= nil) and (l ~= nil) and (d >= 0) and (d <= 11) and (l >= 0) and ( l <= 11) and (d ~= l) then
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sda = d
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scl = l
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else
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print("iic config failed!") return nil
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end
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print("init done")
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i2c.setup(id, sda, scl, i2c.SLOW)
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end
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--get time from DS3231
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function M.getTime()
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i2c.start(id)
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i2c.address(id, dev_addr, i2c.TRANSMITTER)
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i2c.write(id, 0x00)
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i2c.stop(id)
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i2c.start(id)
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i2c.address(id, dev_addr, i2c.RECEIVER)
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local c=i2c.read(id, 7)
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i2c.stop(id)
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return bcdToDec(tonumber(string.byte(c, 1))),
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bcdToDec(tonumber(string.byte(c, 2))),
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bcdToDec(tonumber(string.byte(c, 3))),
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bcdToDec(tonumber(string.byte(c, 4))),
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bcdToDec(tonumber(string.byte(c, 5))),
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bcdToDec(tonumber(string.byte(c, 6))),
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bcdToDec(tonumber(string.byte(c, 7)))
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end
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--set time for DS3231
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function M.setTime(second, minute, hour, day, date, month, year)
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i2c.start(id)
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i2c.address(id, dev_addr, i2c.TRANSMITTER)
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i2c.write(id, 0x00)
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i2c.write(id, decToBcd(second))
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i2c.write(id, decToBcd(minute))
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i2c.write(id, decToBcd(hour))
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i2c.write(id, decToBcd(day))
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i2c.write(id, decToBcd(date))
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i2c.write(id, decToBcd(month))
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i2c.write(id, decToBcd(year))
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i2c.stop(id)
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end
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return M
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