EHRPWM LINUX DRIVER

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You could even do PWM from a shell command by using devmem2 to write to the memory mapped registers from a command line. Currently there are no standard PWM driver for the Beagle, though a couple have been proposed [1] , [2] and [3]. Views Read View source View history. Retrieved from ” https: This is for the 3. This says the MUX is presently set on pin 7. In this exercise you will learn how to use the Beagle’s pulse width modulation pwm hardware using the sysfs interface and also learn about pin multiplexing pin mux on the way.

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EBC Exercise 13 Pulse Width Modulation 3.2

The u-boot details are here. A given pin can have one from as many as eight lines assigned to it. These MUXes are set at boot time, and must be set when the kernel boots, or in linix.

You may have to set the duty cycle to 0 to change the frequency. I was ehrpwwm to get a 1. Views Read View source View history. Embedded Linux Class by Mark A. In a previous exercise EBC Exercise 11 gpio Polling and Interrupts you saw how to use the gpio to produce a square wave out using a C program and sysfs. Currently there are no standard Ehepwm driver for the Beagle, though a couple have been proposed [1][2] and [3]. Privacy policy About eLinux. Follow the instructions here if you aren’t set up for git.

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There are two ways to do this, the slick way which may not work and the sure way. Here’s another PWM lead.

This says the MUX is presently set on pin 7. Counting starts on the whrpwm with 0. This will show up at ehrpwm1A the 0 maps to A. Can you guess why?

AMx PWM Driver’s Guide – Texas Instruments Wiki

Try changing the frequency and duty cycle. In this exercise you will learn how to use the Beagle’s pulse width modulation pwm hardware using the sysfs interface and also learn about pin multiplexing pin mux on the way.

The version of the kernel and u-boot that I’ve given you should already be configured to access the PWM pins. If these command cause the SSH connection to close, you may have to get a newer version of Angstrom.

This is for the 3. You could even do PWM from a shell command by using devmem2 to write to the memory mapped registers from a command line. What’s the highest frequency you can get? The DM has 11 general purpose timers, 4 of which gpt8-gpt11 can be brought out of the chip and used for pulse width modulation DM TRM page You’ll see something like:.

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Retrieved from ” https: We want pin 6. I couldn’t set them during kernel boot with the 2.

Navigation menu Personal tools Log in Request account. If it isn’t you’ll have to recompile the Kernel and u-boot. How do you know which one to change? This page was last edited on 31 Mayat The standard way to interface with the outside world in Linux is through Kernel Drivers.

Now, check the settings by browsing to http: