From 75382336164c8284196eb1fad057050ba735a72d Mon Sep 17 00:00:00 2001 From: rafael Date: Sat, 9 Nov 2024 17:19:06 +0100 Subject: correct rp pwm dutycycle examples: desired frequency --- examples/rp/src/bin/pwm.rs | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'examples/rp/src') diff --git a/examples/rp/src/bin/pwm.rs b/examples/rp/src/bin/pwm.rs index 791b88b5b..06b9313f2 100644 --- a/examples/rp/src/bin/pwm.rs +++ b/examples/rp/src/bin/pwm.rs @@ -48,11 +48,15 @@ async fn pwm_set_dutycycle(slice2: PWM_SLICE2, pin4: PIN_4) { // If we aim for a specific frequency, here is how we can calculate the top value. // The top value sets the period of the PWM cycle, so a counter goes from 0 to top and then wraps around to 0. // Every such wraparound is one PWM cycle. So here is how we get 25KHz: + let desired_freq_hz = 25_000; + let clock_freq_hz = embassy_rp::clocks::clk_sys_freq(); + let divider = 16u8; + let period = (clock_freq_hz / (desired_freq_hz * divider as u32)) as u16 - 1; + let mut c = Config::default(); - let pwm_freq = 25_000; // Hz, our desired frequency - let clock_freq = embassy_rp::clocks::clk_sys_freq(); - c.top = (clock_freq / pwm_freq) as u16 - 1; - + c.top = period; + c.divider = divider.into(); + let mut pwm = Pwm::new_output_a(slice2, pin4, c.clone()); loop { -- cgit From ccf2e0c528a85518e9d64456d9dfde9e951ef613 Mon Sep 17 00:00:00 2001 From: rafael Date: Sat, 9 Nov 2024 17:37:24 +0100 Subject: formatting --- examples/rp/src/bin/pwm.rs | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'examples/rp/src') diff --git a/examples/rp/src/bin/pwm.rs b/examples/rp/src/bin/pwm.rs index 06b9313f2..cf6531994 100644 --- a/examples/rp/src/bin/pwm.rs +++ b/examples/rp/src/bin/pwm.rs @@ -9,7 +9,7 @@ use defmt::*; use embassy_executor::Spawner; -use embassy_rp::peripherals::{PIN_25, PIN_4, PWM_SLICE2, PWM_SLICE4}; +use embassy_rp::peripherals::{PIN_4, PIN_25, PWM_SLICE2, PWM_SLICE4}; use embassy_rp::pwm::{Config, Pwm, SetDutyCycle}; use embassy_time::Timer; use {defmt_rtt as _, panic_probe as _}; @@ -48,15 +48,15 @@ async fn pwm_set_dutycycle(slice2: PWM_SLICE2, pin4: PIN_4) { // If we aim for a specific frequency, here is how we can calculate the top value. // The top value sets the period of the PWM cycle, so a counter goes from 0 to top and then wraps around to 0. // Every such wraparound is one PWM cycle. So here is how we get 25KHz: - let desired_freq_hz = 25_000; + let desired_freq_hz = 25_000; let clock_freq_hz = embassy_rp::clocks::clk_sys_freq(); let divider = 16u8; let period = (clock_freq_hz / (desired_freq_hz * divider as u32)) as u16 - 1; - + let mut c = Config::default(); c.top = period; c.divider = divider.into(); - + let mut pwm = Pwm::new_output_a(slice2, pin4, c.clone()); loop { -- cgit From ed10b9de7b0292a23036d3144146cff8137caf4f Mon Sep 17 00:00:00 2001 From: rafael Date: Sat, 9 Nov 2024 17:39:21 +0100 Subject: formatting --- examples/rp/src/bin/pwm.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'examples/rp/src') diff --git a/examples/rp/src/bin/pwm.rs b/examples/rp/src/bin/pwm.rs index cf6531994..2f5f94870 100644 --- a/examples/rp/src/bin/pwm.rs +++ b/examples/rp/src/bin/pwm.rs @@ -9,7 +9,7 @@ use defmt::*; use embassy_executor::Spawner; -use embassy_rp::peripherals::{PIN_4, PIN_25, PWM_SLICE2, PWM_SLICE4}; +use embassy_rp::peripherals::{PIN_25, PIN_4, PWM_SLICE2, PWM_SLICE4}; use embassy_rp::pwm::{Config, Pwm, SetDutyCycle}; use embassy_time::Timer; use {defmt_rtt as _, panic_probe as _}; -- cgit