nRF51/52 : Disable Unused GPIOs

最新推荐文章于 2021-06-03 23:33:29 发布

u013606170

最新推荐文章于 2021-06-03 23:33:29 发布

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分类专栏：單片機文章标签： nRF bluetooth-low-energy

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本文介绍了一种通过设置未使用的GPIO为输入状态并断开输入缓冲的方式，来减少nRF51822/nRF52832设备的功耗。提供了两种实现方法：直接操作寄存器和调用API函数。

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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*/