68 lines
2.3 KiB
Lua
68 lines
2.3 KiB
Lua
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-- Touch module for 5 pads
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-- Configures 5 pads at 90% threshold and gives callback
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-- Using pins 2=GPIO2, 3=GPIO15, 4=GPIO13, 5=GPIO12,
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-- 6=GPIO14, 7=GPIO27, 8=GPIO33, 9=GPIO32
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local m = {}
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-- Touch uses pins 2, 12, 13, 14, 15, 27, 33, 32
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m.pads = {2,3,4,5,6} -- pad = 0 || {0,1,2,3,4,5,6,7,8,9} 0=GPIO4, 1=GPIO0, 2=GPIO2, 3=GPIO15, 4=GPIO13, 5=GPIO12, 6=GPIO14, 7=GPIO27, 8=GPIO33, 9=GPIO32
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-- Public object for touchpad
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m.tp = nil
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m._cb = nil
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m._isInitted = false
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-- Pass in tbl
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-- @param cb This is your callback when pads touched
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function m.init(tbl)
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if m._isInitted then
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print("Already initted")
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return
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end
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if tbl ~= nil then
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if tbl.cb ~= nil then m._cb = tbl.cb end
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end
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m._tp = touch.create({
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pad = m.pads, -- pad = 0 || {0,1,2,3,4,5,6,7,8,9} 0=GPIO4, 1=GPIO0, 2=GPIO2, 3=GPIO15, 4=GPIO13, 5=GPIO12, 6=GPIO14, 7=GPIO27, 8=GPIO33, 9=GPIO32
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cb = m._cb, -- Callback will get Lua table of pads/bool(true) that were touched.
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intrInitAtStart = false, -- Turn on interrupt at start. Default to true. Set to false in case you want to config first. Turn it on later with tp:intrEnable()
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thres = 0, -- Start with thres 0 so no callbacks, then set thres later with tp:setThres(padNum, thres)
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thresTrigger = touch.TOUCH_TRIGGER_BELOW, -- Touch interrupt if counter value is below or above threshold. TOUCH_TRIGGER_BELOW or TOUCH_TRIGGER_ABOVE
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lvolt = touch.TOUCH_LVOLT_0V5, -- Low ref voltage TOUCH_LVOLT_0V4, TOUCH_LVOLT_0V5, TOUCH_LVOLT_0V6, TOUCH_LVOLT_0V7
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hvolt = touch.TOUCH_HVOLT_2V7, -- High ref voltage TOUCH_HVOLT_2V4, TOUCH_HVOLT_2V5, TOUCH_HVOLT_2V6, TOUCH_HVOLT_2V7
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atten = touch.TOUCH_HVOLT_ATTEN_1V, -- High ref atten TOUCH_HVOLT_ATTEN_0V, TOUCH_HVOLT_ATTEN_0V5, TOUCH_HVOLT_ATTEN_1V, TOUCH_HVOLT_ATTEN_1V5
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isDebug = true
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})
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end
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function m.read()
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local raw = m._tp:read()
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print("Pad", "Val")
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for key,value in pairs(raw) do
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print(key,value)
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end
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end
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function m.config()
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local raw = m._tp:read()
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print("Configuring trigger to:")
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print("Pad", "Val", "Thres")
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for key,value in pairs(raw) do
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-- reduce thres to 90% of untouched counter value
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local thres = math.floor(raw[key] * 0.9)
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m._tp:setThres(key, thres)
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print(key, raw[key], thres)
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end
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m._tp:intrEnable()
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end
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return m
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