ZYBO Led Blinker

[DeAndreHJ]

Hi guys, I am planning to build a ZYBO Led Blinker controlled by ethernet communication. Essentially, what this means is that I will be controlling the blinking speed of the led on the zybo through ethernet communication. Regarding this, I would like to get some advice on how I should build the c code. I already am able to send data through TCP/IP and get it to light up the way I want it to be, meaning if I were to put 1100, the led would light up in the sequence. Sorry if this is unclear as I am new to this.

[jpeyron]

Hi @DeAndreHJ,

Could you attach your sdk code?

thank you,

Jon

[DeAndreHJ]

ive attached the files. The echo.c file is the program file and the main.c file is the lwIP template file.

echo.c

main.c

[DeAndreHJ]

40 minutes ago, DeAndreHJ said:

ive attached the files. The echo.c file is the program file and the main.c file is the lwIP template file.

echo.c

main.c

Ive tried to change the last part of the echo.c part with "

void set_led(char cmd[4])
{
    uint8_t led_value = 0;

    int i;

    for (i = 0; i < cmd[4]; i++) {
        led_value = i;

    xil_printf("LED value = %X\n", led_value);
    }

    // Write LED value to AXI GPIO
    XGpio_DiscreteWrite(&led, 1, led_value);
}

"

However, it fails. Any help with this c program would be greatly appreciated.

[DeAndreHJ]

2 hours ago, DeAndreHJ said:

Ive tried to change the last part of the echo.c part with "

void set_led(char cmd[4])
{
    uint8_t led_value = 0;

    int i;

    for (i = 0; i < cmd[4]; i++) {
        led_value = i;

    xil_printf("LED value = %X\n", led_value);
    }

    // Write LED value to AXI GPIO
    XGpio_DiscreteWrite(&led, 1, led_value);
}

"

However, it fails. Any help with this c program would be greatly appreciated.

Basically, I want to be able to have an input that can change the frequency of the blinking of the led (making it blink faster or slower). Like the tutorial https://reference.digilentinc.com/learn/programmable-logic/tutorials/zybo-creating-custom-ip-cores/start

[jpeyron]

Hi @DeAndreHJ,

I have attached an altered echo file that reads in data from the serial terminal through the ethernet that should help in your project.

thank you,

Jon

echo (2).txt

[DeAndreHJ]

Hi jpeyron,

I have followed the tutorial "Creating a Custom IP core using the IP Integrator" https://reference.digilentinc.com/learn/programmable-logic/tutorials/zybo-creating-custom-ip-cores/start and have managed to merge it with the video shown below. Now, with my sdk echo code, I would very much like to know how I could go about initialising My_PWM_Core.

 

echo.c

[jpeyron]

Hi @DeAndreHJ,

Are you adding a custom ip and getting errors? Or are you trying to modify the echo to allow you to alter the rate the leds are blinking? If you are trying to alter the echo then the echo.c i linked above does not echo text  but rather checks for specific strings and then prints out specific text. You could alter this code to change the variable you are using to change the PWM on the LEDs. Are you able to change the PWM on the LEDs in a project without the ethernet?

thank you,

Jon

[DeAndreHJ]

Yes, I am able to change the PWM on the LEDs in the project with ethernet. My problem now is that I would like to change the frequency and duty cycle of the LEDs, input will still be through ethernet.

echo.c

[jpeyron]

Hi @DeAndreHJ,

Are you able to change the frequency and duty cycle of the LEDs with out the ethernet in sdk?

thank you,

Jon

[DeAndreHJ]

Hi @jpeyron,

No, I am unable to do that. However, I did manage to change the duty cycle of the PWM. On the leds, whenever I have an input value, the leds would be set to that particular brightness. Now, however, I wish to change the frequency of the PWM with c code. Any advice on this area?

echo.c

[jpeyron]

Hi @DeAndreHJ,

Could you use a different strings read from the ethernet in the echo.c to add a different delays that would change the frequency in the blinking leds.

thank you,

Jon 

[DeAndreHJ]

hi, will it change the frequency of the PWM? 

[jpeyron]

Hi @DeAndreHJ,

 I'm not certain that adding a delay in the echo.c  will change the frequency but i might be worth looking into this type of change. Also how did you change the duty cycle? That might be where you could change the frequency.

thank you,

Jon