Posted on June 07, 2018 at 06:46Hi All,
I am working on a charger based on STM32F04.
It can detect the SDP or DCP when PC or charger connected, but it only works one time. That means when I unplug and plug the USB, it always detects as SDP.
I believe it might be the USB is not uninitialized correctly, but really don't know which parts cause this problem.
When I do a software reset, then the correct port type can be detected. So I am not sure what USB uninitialized should be done.
thanks
if(vbus_detect)
{
if(usb_init)
{
USBD_Stop(&hUsbDeviceFS);
USBD_DeInit(&hUsbDeviceFS);
HAL_Delay(10);
*(uint16_t *)(USB_BCDR) &= (uint16_t)(~(USB_BCDR_DPPU));
__IO uint16_t * cntr=(uint16_t *)(USB_CNTR);
(*cntr)= USB_CNTR_FRES
}
USBD_Init(&hUsbDeviceFS, &FS_Desc, DEVICE_FS);
USBD_RegisterClass(&hUsbDeviceFS, &USBD_CDC);
USBD_CDC_RegisterInterface(&hUsbDeviceFS, &USBD_Interface_fops_FS);
charge_port_detect();
USBD_Start(&hUsbDeviceFS);
usb_init=true;
}
void charge_port_detect()
{
__IO uint16_t * bcdr=(uint16_t *)(USB_BCDR);
(*bcdr) |= (USB_BCDR_BCDEN);
HAL_Delay( 300 );
(*bcdr) |= (USB_BCDR_PDEN);
HAL_Delay( 300 );
lastport=port;
/* If Charger detect ? */
if( (*bcdr) & USB_BCDR_PDET )
{
/* Start secondary detection to check connection to Charging Downstream
Port or Dedicated Charging Port */
(*bcdr) &= ~(USB_BCDR_PDEN);
(*bcdr) |= (USB_BCDR_SDEN);
HAL_Delay( 300 );
/* If CDP ? */
if( (*bcdr) & USB_BCDR_SDET )
{
/* Dedicated Downstream Port DCP */
port = PORT_DCP;
}
else
{
/* Charging Downstream Port CDP */
port = PORT_CDP;
}
}
else /* NO */
{
/* Standard Downstream Port */
port = PORT_SDP;
}
(*bcdr) &= ~(USB_BCDR_BCDEN);
}
#usb-stm32f04-battery-charging-detector(usb_bcdr)
