get rid of timers, pin toggling is slow enough

1 files changed, 5 insertions, 11 deletions

diff --git a/microwire.lua b/microwire.lua
index d50b395..c6d97e8 100644
--- a/microwire.lua
+++ b/microwire.lua
@@ -41,24 +41,18 @@ function microwire_send_data( data )
 	-- essentially send data via spi interface
 	-- and raise Load Enable pin for a bit (at least for 25 nS) at the end of transmission
 	
-	-- first low LE pin
+	-- first low LE pin, it should be low but just to be sure
 	gpio.write(microwire_LE_pin, gpio.LOW)
 
 	-- second send the data
 	local nBytes = spi.send(spiID, data)
 
+	
 	-- finally raise LE pin for at least 25 ns,
+	-- note that it takes about 300 uS on ESP8266 before LE will be HIGH after spi.send
 	gpio.write(microwire_LE_pin, gpio.HIGH)
-	-- but since optocoupler is limiting us we will do it for longer
-	local microwireLEonTime = 100; -- time is in uS
-
-	-- the easiest to use tmr.delay( timeIn_uS ) but this halts everything
-	-- tmr.delay( microwireLEonTime )
-	-- so we use timer but unfortunately the smallest time is 1ms
-	microwireLEonTime = 1; -- time is in mS for timers
-	microwire_tmr = tmr.create()
-	microwire_tmr:register(microwireLEonTime, tmr.ALARM_SINGLE, function() gpio.write(microwire_LE_pin, gpio.LOW) end)
-	microwire_tmr:start()
+	-- we immediately drop LE pin to low, Scope shows that the pin will be on for 80 uS
+	gpio.write(microwire_LE_pin, gpio.LOW)
 end
 
 microwire_setup_interface()