topic MQX with Processor Expert enabled BSP - CDC Virtual COM demo - device will not enumerate in MQX Software Solutions

MQX with Processor Expert enabled BSP - CDC Virtual COM demo - device will not enumerate

niroc — Sun, 03 Jul 2011 01:52:03 GMT

The USB CDC Virtual COM demo (cdc_vcom_twrk40x256) that ships with MQX 3.7 stops working (device will not enumerate) as soon as MQX 3.7 is updated to use the Processor Expert Logical Level Device Driver enabled BSP (bsp_twrk40x256_pe) instead of the default BSP (bsp_twrk40x256).

My configuration:

Operating System: Windows XP SP2

IDE: CodeWarrior 10.1

RTOS: MQX 3.7

After a clean installation of CW 10.1 and MQX 3.7...

Steps to reproduce USB CDC device enumeration problem:

Verify that the CDC Virtual COM demo (cdc_vcom_twrk40x256) works.
Import and rebuild bsp_twrk40x256_pe and psp_twrk40x256.
Rebuild cdc_vcom_twrk40x256.
Verify that the CDC Virtual COM demo no longer works (device will not enumerate).

I did a clean build of all MQX libs and the device will still not enumerate.

bsp_twrk40x256_pe

psp_twrk40x256

mfs_twrk40x256

rtcs_twrk40x256

shell_twrk40x256

usb_ddk_twrk40x256

usb_hdk_twrk40x256

Any ideas?

Re: MQX with Processor Expert enabled BSP - CDC Virtual COM demo - device will not enumerate

MVa — Sat, 09 Jul 2011 03:47:03 GMT

Verify the USB clock frequency in the CPU component. See" CPU component \ Clock configurations \ Clock configuration 0 \ System clocks \ PLLFLL clock selection \ USB clock settings \ USB clock". USB module requires 48 MHz clock .

Re: MQX with Processor Expert enabled BSP - CDC Virtual COM demo - device will not enumerate

niroc — Sun, 21 Aug 2011 01:37:32 GMT

The clock settings are set correctly. Seet attached screenshot of my settings. I did not modify these settings at all after a clean install of MQX 3.7, which means the settings in my screenshot represent the settings that ship with MQX 3.7.

I contacted a Freescale rep. and received the following as the reply:

"Have Robotronics run the demo file in C:\Program Files\Freescale\Freescale MQX 3.7\usb\device\examples\cdc\virtual_com\cw10 When run, they will be asked to install a .inf file for the CDC. It’s in C:\Program Files\Freescale\Freescale MQX 3.7\usb\device\examples\cdc\virtual_com\inf Run both the P&E Terminal Program (which reports status) and open a terminal program (Hyperterm, PuTTY, TerraTerm) using the COM port assigned by Windows."

The P&E Terminal is not necessary to successfully run the CDC demo (cdc_vcom_twr40x256) using the default BSP and

attaching the P&E Terminal to the USB COM to monitor status didn't help solve the problem when using the Processor Expert enabled BSP. The P&E Terminal reported no status while flashing the processor or when attempting to enumerate the tower module as a CDC USB device.

Re: MQX with Processor Expert enabled BSP - CDC Virtual COM demo - device will not enumerate

petr_uhlir — Fri, 26 Aug 2011 14:49:45 GMT

The CPU component in Processor expert does not set the USB to be clocked from PLL as required by MQX USB IO driver.

So if you replace the _bsp_usb_io_init function in init_gpio.c by the following one it will work for both PE and non PE BSPs.

The same patch is valid also for TWR-K60N512 BSP.

_mqx_int _bsp_usb_io_init

(

void

)

{

#if PE_LDD_VERSION

/* USB clock is configured using CPU component */

/* Check if peripheral is not used by Processor Expert USB_LDD component */

if (PE_PeripheralUsed((uint_32)USB0_BASE_PTR) == TRUE) {

/* IO Device used by PE Component*/

return IO_ERROR;

}

#else

/* Configure USBFRAC = 0, USBDIV = 1 => frq(USBout) = 1 / 2 * frq(PLLin) */

SIM_CLKDIV2_REG(SIM_BASE_PTR) &= SIM_CLKDIV2_USBFRAC_MASK | SIM_CLKDIV2_USBDIV_MASK;

SIM_CLKDIV2_REG(SIM_BASE_PTR) |= SIM_CLKDIV2_USBDIV(BSP_USB_DIV) | BSP_USB_FRAC;

#endif

/* Configure USB to be clocked from PLL */

SIM_SOPT2_REG(SIM_BASE_PTR) |= SIM_SOPT2_USBSRC_MASK | SIM_SOPT2_PLLFLLSEL_MASK;

/* Enable USB-OTG IP clocking */

SIM_SCGC4_REG(SIM_BASE_PTR) |= SIM_SCGC4_USBOTG_MASK;

/* USB D+ and USB D- are standalone not multiplexed one-purpose pins */

/* VREFIN for device is standalone not multiplexed one-purpose pin */

#if BSP_USB_TWR_SER2

/* TWR-SER2 board has 2 connectors: on channel A, there is Micro-USB connector,

** which is not routed to TWRK40 board. On channel B, there is standard

** A-type host connector routed to the USB0 peripheral on TWRK40. To enable

** power to this connector, GPIO PB8 must be set as GPIO output

PORT_PCR_REG(PORTB_BASE_PTR, 8) = PORT_PCR_MUX(0x01) | PORT_PCR_PE_MASK;

GPIO_PDDR_REG(PTB_BASE_PTR) |= 0x00000100; // PB8 as output

GPIO_PDOR_REG(PTB_BASE_PTR) |= 0x00000100; // PB8 in high level

#endif

return MQX_OK;

}