uhk/KSDK_2.0_MK22FN512xxx12
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Make the loop depend on the clock frequency when sending out the resume signal, as the delay time is critical

Browse Source 
See: http://www.usbmadesimple.co.uk/ums_3.htm and https://www.nxp.com/docs/en/application-note/AN5385.pdf
This commit is contained in:
Kristian Sloth Lauszus
2018-03-11 18:38:30 +01:00
parent 9fbf2bbf08
commit 4b5d5310d1
1 changed files with 10 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
middleware/usb_1.0.0/device/usb_device_khci.c
View File

@@ -1199,10 +1199,19 @@ usb_status_t USB_DeviceKhciControl(usb_device_controller_handle khciHandle, usb_
#if defined(USB_DEVICE_CONFIG_REMOTE_WAKEUP) && (USB_DEVICE_CONFIG_REMOTE_WAKEUP > 0U) #if defined(USB_DEVICE_CONFIG_REMOTE_WAKEUP) && (USB_DEVICE_CONFIG_REMOTE_WAKEUP > 0U)
USB_OSA_ENTER_CRITICAL(); USB_OSA_ENTER_CRITICAL();
khciState->registerBase->CTL |= USB_CTL_RESUME_MASK; khciState->registerBase->CTL |= USB_CTL_RESUME_MASK;
for (uint32_t i = 500U; i > 0U; i--) #if 1 // This is a hack and is not tuned in any way, but it works - note that we can not use a timer, as interrupts are disabled
for (uint64_t i = MSEC_TO_COUNT(8, SystemCoreClock); i > 0U; i--)
{
// The device must apply the wakeup K condition between 1 to 15 ms - see: http://www.usbmadesimple.co.uk/ums_3.htm and https://www.nxp.com/docs/en/application-note/AN5385.pdf
__ASM("nop");
}
#else
// I increasing this from 500 to 1000, but it is better to use a timer
for (uint32_t i = 1000U; i > 0U; i--)
{ {
__ASM("nop"); __ASM("nop");
} }
#endif
khciState->registerBase->CTL &= ~USB_CTL_RESUME_MASK; khciState->registerBase->CTL &= ~USB_CTL_RESUME_MASK;
USB_OSA_EXIT_CRITICAL(); USB_OSA_EXIT_CRITICAL();
error = kStatus_USB_Success; error = kStatus_USB_Success;