Throttles the transmitter if hardware flow control is enabled.
Driving this pin low enables transmitter; driving this pin high disables it.
This pin goes high on power up and goes low when the system is
ready. If hardware flow control is enabled, this pin toggles to high to
indicate the RX buffer is full.
NOTE: On the Wi-Fi serial adapter (RN-370) and the RN-174 evaluation board, the blue LED is connected to GPIO7.
The blue LED is NOT connected to GPIO7 on the RN-134 board. It is not possible to power off the blue LED
on the RN-134 board because it is connected directly to power.
Setting the Alternate GPIO Functions
The GPIO4, 5, and 6 default function is to control the LEDs. You can override the default to allow user programmable I/O or
alternate I/O functionality by using the set sys iofunc <mask> command, where <mask> is entered as a hex number. The
hex value represents a bitmask that controls each bit in the <mask> and represents a particular GPIO pin. If a bit is 0, then
the corresponding GPIO pin is driven/read by the firmware per the default function. The I/O function <mask> is encoded
as shown in Table 23.
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