CY8CKIT-059 usb device enumeration problem

Anonymous · ‎Aug 30, 2017

I have the following problem with device enumeration on a CY8CKIT-059:

Anytime I program the device from the kitprog and then connect the USB - everything works as expected.

However once I program the board and remove the kitprog usb the USBFS component fails to get past "while(!USBFS_GetConfiguration())".

I feel its not a power supply problem for the following reasons:

1. All code before "while(!USBFS_GetConfiguration())" runs when I connect the micro USB port to my computer

2. Even if I plug in the kitprog into the computer and then plug in the micro USB - the program halts at "while(!USBFS_GetConfiguration())".

I am using libusb on the host side to communicate with the device and the following code prints out "device not found" (unless of course I program the kit and then plug in the usb while the device is powered)

    dev = libusb_open_device_with_vid_pid(NULL, 0x1111, 0x2222);

    if (dev == NULL) {

        cout << "device not found" << endl;

        return false;

Anonymous · ‎Sep 01, 2017

Never mind, I got it to work. I was making a smaller project to show the problem and realized in the process that shifting the usb startup code to the start of main solves the problem - I would like to know why it solves the problem though.

So instead of

int main(){

CyGlobalIntEnable;

#ifdef MPU

I2C_MPU6050_Start();

MPU6050_selectLowerArm();

MPU6050_initialize();

MPU6050_selectUpperArm();

MPU6050_initialize();

#endif

#ifdef USB

USBFS_Start(USBFS_DEVICE, USBFS_5V_OPERATION);

while (!USBFS_GetConfiguration());

USBFS_EnableOutEP(OUT_EP_NUM);

#endif

led_pin_Write(1);

....

I now have

int main(){

CyGlobalIntEnable;

#ifdef USB

USBFS_Start(USBFS_DEVICE, USBFS_5V_OPERATION);

while (!USBFS_GetConfiguration());

USBFS_EnableOutEP(OUT_EP_NUM);

#endif

led_pin_Write(1);

#ifdef MPU

I2C_MPU6050_Start();

MPU6050_selectLowerArm();

MPU6050_initialize();

MPU6050_selectUpperArm();

MPU6050_initialize();

#endif

There is no problem connecting to the I2C device so Im not sure why this hack solves the problem.

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CY8CKIT-059 usb device enumeration problem

CY8CKIT-059 usb device enumeration problem

Re: CY8CKIT-059 usb device enumeration problem