hwstub: introduce lua code for the STMP and Creative ZEN V/Mozaic

Change-Id: Ice5f509a2e0d2114436d4760f338b9203ef96691

utils/hwstub/tools/lua/stmp/pwm.lua

@@ -0,0 +1,35 @@
+--
+-- LCDIF
+--
+
+STMP.pwm = {}
+
+function STMP.pwm.init()
+    HW.LCDIF.CTRL.SFTRST.clr()
+    HW.LCDIF.CTRL.CLKGATE.clr()
+end 
+
+function STMP.pwm.enable(chan, en)
+    if en then
+        HW.PWM.CTRL.set(bit32.lshift(1, chan))
+    else
+        HW.PWM.CTRL.clr(bit32.lshift(1, chan))
+    end
+end
+
+function STMP.pwm.setup(channel, period, cdiv, active, active_state, inactive, inactive_state)
+    -- stop
+    STMP.pwm.enable(channel, false)
+    -- setup pin
+    --FIXME
+    -- watch the order ! active THEN period
+    -- NOTE: the register value is period-1
+    HW.PWM.ACTIVEn[channel].ACTIVE.write(active)
+    HW.PWM.ACTIVEn[channel].INACTIVE.write(inactive)
+    HW.PWM.PERIODn[channel].PERIOD.write(period - 1)
+    HW.PWM.PERIODn[channel].ACTIVE_STATE.write(active_state)
+    HW.PWM.PERIODn[channel].INACTIVE_STATE.write(inactive_state)
+    HW.PWM.PERIODn[channel].CDIV.write(cdiv)
+    -- restore
+    STMP.pwm.enable(channel, true)
+end