how to configure two gpio pins for pwm

[MARTIN FR]

main.cHello everyone

i am trying to configure two GPIO pins for PWM in order to increase the sound level of the buzzer i am able make the buzzer beep sound by referring the pwm example but in this example i did not find the GPIO configuration

///* 1-channel PWM, 200Hz, output on DK 7 pin. */

app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_1CH(1500L,7);

so can anyone suggest how to configure 2gpio pins for one buzzer connection any ideas and suggestions will be really useful for me

Thank you

[Nikolaus Wittenstein]

Instead of the APP_PWM_DEFAULT_CONFIG_1CH macro, use the APP_PWM_DEFAULT_CONFIG_2CH macro (2 channels instead of 1 channel). Then you can pass in two pin numbers. Just set them to identical duty cycles and they should rise and fall in sync.

[MARTIN FR]

i have set like that what you have suggested app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(5000L,6,7); but when i check the voltage of the two pins one pin is showing 3 v and the other pin is showing 0v it means that is not configured correctly so can you suggest me something new and other ideas so that i can able to increase the loudness of the battery by suppling more current

[Nikolaus Wittenstein]

Are you making sure that you're setting the duty cycle for both pins? If you change only that one line, the second pin won't be PWMed.

If you really want to make it louder I'd just use a transistor or something. That's what they're originally for, after all.

You could also put the pin into high drive mode, by setting the register yourself or using something like nrf_gpio_cfg. This will increase the output current 10x.

[MARTIN FR]

i have uploaded my cvode can you please check that and suggest me what else i do need to add or modify because am new to this embbedded softwa&re so if possibe i can take your help to devlop simple PWM