hardware_pwm Library Functions

To use this library, add following to the C/C++ file,

#include <hardware/pwm.h>

and following to the CMakeLists.txt file.

target_link_libraries(projectName pico_stdlib hardware_gpio hardware_pwm)

Following are some of the most commonly used functions for configuring the PWM peripheral.

uint8_t pwm_gpio_to_slice_num(uint8_t pinNo)

Get the PWM slice number for a GPIO number.

• Function input pinNo can be any GPIO number, i.e. 0 through 29.
• Function returns a slice number, 0 through 7, corresponding to the GPIO number provided.

uint8_t pwm_gpio_to_channel(uint8_t pinNo)

Get the PWM channel number for a GPIO number.

• Function input pinNo can be any GPIO number, i.e. 0 through 29.
• Function returns a channel number, 0 or 1, corresponding to the GPIO number provided.

pwm_set_clkdiv_int_frac(uint8_t sliceNum, uint8_t divInt, uint8_t divFrc)

Configure the clock divider integer and fractional values.

• Function input sliceNum is the PWM slice number that you may want to configure.
• Function input divInt is the 8-bit integer part of the clock divider, 1 through 255.
• Function input divFrc is the 4-bit fractional part of the clock divider, 0 through 15.

pwm_set_wrap(uint8_t sliceNum, uint16_t top)

Configure the counter wrap value.

• Function input sliceNum is the PWM slice number that you may want to configure.
• Function input top is the 16-bit counter wrap value, 0 through 65535.

pwm_set_chan_level(uint8_t sliceNum, uint8_t chanNum, uint16_t cc)

Configure the counter compare value.

• Function input sliceNum is the PWM slice number that you may want to configure.
• Function input chanNum is the channel number of the slice that you may want to configure.
• Function input cc is the 16-bit counter compare value, 0 through 65535.

pwm_set_enabled(uint8_t sliceNum, bool enabled)

Enable or disable the PWM output.

• Function input sliceNum is the PWM slice number that you want to enable or disable.
• Function input enabled must be a boolean value, i.e. 0 to disable the output and 1 to enable the output.

Next

Code Examples

Back

Working of a PWM