User Manual

GPIO Control

There's two GPIO pins you can use to blink LEDs. They are GPIO1 and GPIO2 - GPIO3 is used for the oscillator. To set

them to be outputs call

setGPIOctrl(

bitmask

)

where the bitmask has a 1 bit for each of the two pins. For example to set GPIO2 to be an output use setGPIOctrl((1<<2))

to set both outputs, use setGPIOctrl((1<<2) || (1<<1))

Then you can set the output with

setGPIO(

bitmask

)

same idea with the bitmask, to turn both on, use setGPIOctrl((1<<2) || (1<<1)). To turn GPIO2 on and GPIO1 off,

setGPIOctrl(1<<2)

Advanced!

We, by default, use the built-in AGC (auto-gain control) system so the audio level is maxed out. This may be annoying

to you if have a good quality line level and the volume is fluctuating (it should be quiet, but isnt)

in the Adafruit_Si4713.cpp file find these lines

//setProperty(SI4713_PROP_TX_ACOMP_ENABLE, 0x02); // turn on limiter, but no dynamic ranging

setProperty(SI4713_PROP_TX_ACOMP_ENABLE, 0x0); // turn on limiter and AGC

and uncomment the first one, and comment the second. This will turn off the AGC