User's Manual

Table Of Contents

General Purpose I/O:

The general purpose I/O is organized as one port enabling access and control of the 32 available

GPIO pins through one port. Each GPIO can be accessed individually with the following user

configurable features:

 Input/output direction

 Output drive strength

 Internal pull-up and pull-down resistors

 Wake-up from high or low level triggers on all pins

 Trigger interrupt on all pins

 All pins can be used by the PPI task/event system; the maximum number of pins that can be

interfaced through the PPI at the same time is limited by the number of GPIOTE channels

 All pins can be individually configured to carry serial interface or quadrature demodulator

signals

PA control:

A logic signal is needed to enable/disable PA/LNA part, P0.20 is used to achieve this purpose.

Set P0.20 to high will enable PA/LNA. Set P0.20 to low will disable PA/LNA to deep sleep mode.

As the most basic use case, simply set the P0.20 to high will enable PA/LNA part always.

If you need to get lower power consumption, you need to accurately control the timing of the

PA/LNA when it need to work, in accordance with the provisions of the timing will be closed.

In order to achieve this goal, need to know exactly time to control the PA/LNA. By calling the

Notify Radio() function, you can know when the RF activation, resulting in the appropriate timing to

control P0.20.

#define PIN_5518CTR 20

for (;;)

{

if(m_radio_active_flag)//enable PA

{

m_radio_active_flag=0;

nrf_gpio_pin_set(PIN_5518CTR);//pin 20

err_code = app_timer_start(m_apps_timer_id, APP_TIMER_TICKS(10,

APP_TIMER_PRESCALER) , NULL);//app_timer 10ms

APP_ERROR_CHECK(err_code);