Support needed for NXP KL25Z Freedom board
kowshik1729 last edited by
I've been practicing ARM programming over NXP's Kinetis series KL25Z board. Unlike the kinetis HAL approach, I am practicing entirely using baremetal coding with Keil U vision. I am facing problems in coding the UART programme of this board. If anyone has any prior experience over this board please do help me out guys. I have attached the link for the datasheet of this board FRDM KL25Z Datasheet Link
Thanks in advance
salmanfaris last edited by
Hi @kowshik1729 ,
Could you please specify what problem you are facing while using UART in KL25Z? it will be more helpful to understand your situation. also, try to attach some useful error log.
@Richu-Bini thanks for posting the question . just for a brief about pwm, pulse width modulation technique is a method to change the duty cycle of a wave. Which means you can determine how much time a signal must be on or off.
So, coming to the question, software pwm and hardware pwm is just two different ways of producing same result. In software(referring Arduino here) you'll just write a value between 0 to 255 inorder to determine duty cycle percentage. For example 0 is 0% duty cycle which means the cycle is on for 0% of whole time, similarly 127 means 50% of time cycle will be on and 255 means signal will be on for ever. This is regarding software.
Coming to hardware, you can generate a pwm signal using very simple passive component, called as potentiometer and 555 timer IC by using 555 timer as bistable multivibrator(The generated output will have two stable states 0 and Vmax, hence the name bistable) and changing the resistance using a potentiometer generates different duty cycles. This is the difference between hardware and software pwm. Please let me know if I haven't explained what you have expected.
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What is the difference between hardware pwm and software pwm
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