By this
forum thread, for unused GPIOs in nRF51822/nRF52832, programmer should set those as input pin, and set those in disconnection (from input buffer).
Following the rule, the code be:
//#include "nrf_gpio.h"
/**@brief Function to disable all gpio
*/
static void disable_all_gpio(void)
{
uint32_t i;
for( i = 0; i< NUMBER_OF_PINS; i++){
NRF_GPIO->PIN_CNF[i] =
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
| (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
| (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
| (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos)
| (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
}/*for i*/
}/*disable_all_gpio*/
If you avoid to manipulate the GPIO registers directly, you could call the wrapping function,
nrf_gpio_input_disconnect.
//#include "nrf_gpio.h"
/**@brief Function to disable all gpio
*/
static void disable_all_gpio(void)
{
uint32_t i;
for( i = 0; i< NUMBER_OF_PINS; i++)
nrf_gpio_input_disconnect(i);
}/*disable_all_gpio*/
Theoretically, if you set the unused GPIOs in that way, the power-consumption will be lower.
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