Number of nRF51822 high drive pins

[Tim]

The nRF51822 Product Specification says that "Maximum number of pins with 5 mA high drive is 3."

Does that mean that you can only configure 3 pins as high drive, or could I (for example) configure all pins as high-drive output, as long as no more than three of them source or sink 5 mA at any time? (And is it really 5 mA per pin, or 15 mA total? Could I have 5 pins all sourcing 3 mA each?)

[Stefan Birnir Sverrisson]

To further clarify Annims answer, you can drive 15mA current with GPIOs at a given time, in any combination you like, 3x5mA, 15x1mA, (2x5mA + 5x1mA), doesn't matter

[MARTIN FR]

Can you please verify my configuration of the GPIO high drive Mode does both of the pin 6 and 7 will be drive 5mA or do i ahve modify something please give me some suggestion because am not hearing loud sound in my buzzer

static void PWMinit(void)

{

nrf_gpio_range_cfg_output(6,7);

NRF_GPIO->PIN_CNF[6] = (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos);

NRF_GPIO->PIN_CNF[7] = (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos);

ret_code_t err_code;

app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(159UL,6,7);//6.3KHz

pwm1_cfg.pin_polarity[1] = APP_PWM_POLARITY_ACTIVE_LOW;

/* Initialize and enable PWM. */

err_code = app_pwm_init(&PWM1,&pwm1_cfg,pwm_ready_callback);

APP_ERROR_CHECK(err_code);

app_pwm_enable(&PWM1);

for(int i = 0; i < 3; i++)

{

app_pwm_channel_duty_set(&PWM1, 0, 50);

nrf_delay_ms(1000);
app_pwm_channel_duty_set(&PWM1, 0, 0);

nrf_delay_ms(2000);
  app_pwm_channel_duty_set(&PWM1, 0, 70);

}

app_pwm_disable(&PWM1);

}