PSoC 4 Pioneer Kit Community Project#02 - CapSense Slider

Hi,

Following the example,I write the code to build a CapSense project in PSOC Creat 2.2 SP1,but find there are some errors,such as undefined reference to "PWMWriteCompae";

Could you tell me the possible cause of these errors and help me to solve it?

Thank you very much.

Attach the .ZIP-file here and upload the project

Now I can build it succesfully.I need to write the right API function name,pay attention to the big or small letter.

Thanks

Good to hear, Gui.

Antonio

Thank you very much!

Could you explain,in more detail,why the multicolor LEDs will gradually change color from red to green?

After use PWM_WriteCompare() function to update the PWM pulse width with the new slider position,how does the waveform of the PWM's output(line&line_n changes)?

Thanks

Hi Gui Zhao,

By using the PWM_WriteCompare() API, you are effectively re-configuring the PWM Component's properties during run-time.

By writing a new compare value each time with the slider position, the duty cycle of the PWM changes, which in-turn modifies the LED outputs.

In our project, the PWM Component has 2 outputs, "line" and "line_n" - which are nothing but the inverse of each other (the sum total of these 2 outputs is thereby 100% duty cycle).

"line" is connected to the Red LED while "line_n" (inverse) is connected to the Green LED.

As you adjust the duty cycle of one of PWM outputs by writing a new compare value, the other one inversely changes. Thus, you are going from 0-100% duty cycle on one LED, and the opposite on the 2nd LED. The result to the naked eye is a gradual change between the LED output between Red and Green colors.

good~！

Hi Im new to any sort of embedded programming but want to give it a go and get stuck in.

I have the PSoC 4 pioneer kit and am trying to do these tutorials.

I have tried to do this one however keep getting stuck.

I have wrote the source code and built it and programmed it all onto the board with no errors showing up in the creator.

However I just have a constant yellowish light on and the slider doesnt do anything.

Was wondering if anyone else has encountered this problem or could suggest solutions.

Cheers in advance

HI George,

This could be because you haven't assigned the CapSense slider to specific IO pins.

You can do this by opening the "<project_name.CYDWR>" file from the project explorer.

• 5-segment Slider - P1[1] - P1[5]
• Green LED - P0[2]
• Red LED - P1[6]

Hi Gagan,

By using the PWM_WriteCompare() API,the compare value has changed, I think it should be less than period value(The period value don't change).

But I found you didn't care about that in the program.It seems that compare value is large than period value.Would you tell me the reason?

Thanks