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Problems with USB VCOM on Cortex-M0+ and USB RL

Hello Forum! I am working on a FRDM-KL25Z dev board and hopign to have it come up as a virtual com port on a windows machine and then interact with the incoming data inside the ARM. I didn't see a straightforward example of doing a VCOM port on this processor so I started out with the USB HID example for the tower system with the same processor (Keil\ARM\Boards\Freescale\XTWR-KL25Z48M\RL\USB\Device\HID) and then copied the usb_config.c and usbd_user_cdc.c from another example (Keil\ARM\Boards\Keil\MCBSTR9\RL\USB\Device\CDC). The project compiles, I load it on the target, and then I see the virtual com port on my system (after installing the driver). I have stripped out the code from usbd_user_cdc.c to remove UART functionality. The problem I am having is when I try to open the virtual com port on the windows side. I tried 9600 baud, which seemed to be the default rate in the demo. I tried Putty and RealTerm, both applications hang when I try to open the specific com port. I was wondering if you folks had an idea what I was doing wrong or how I can begin to troubleshoot this. I have debugging access and it seems that USB works enough to identify its self on my system. I also included the CM1 usb library. I added some relevant code below. (I verified usb_config.c with the wizard and it seems to make sense) Thank you in advance!

I had to put the files on pastebin to meet the 7000 character limit

usb_config.c: http://pastebin.com/4vtczSUB
usbd_user_cdc.c: http://pastebin.com/RrSrH3ML
usbd_MKL25Z4.c: http://pastebin.com/D9WGuqnD

Parents

0 John Ostrowski over 12 years ago in reply to Nick C.

Hi,
same problem on Freescale’s Board TWR-K60N512. There is no example how to use CDC. So I tried to convert one of other examples (HID - which worked), into CDC.
Basically I removed usbd_user_hid.c , KBD.c files from project.
Copied usbd_user_cdc.c and usb_config.c from c:\Keil\ARM\Boards\Keil\MCB2300\RL\USB\Device\CDC\
to project folder and added those 2 files.
After that I modified USBD_Demo.c and usbd_user_cdc.c.
On Windows 7 Professional 64 bit, I used :
mcb2300-vcom.inf, mcb2300-vcom_x86.cat, mcb2300-vcom_amd64.cat files from placed in c:\Keil\ARM\Boards\Keil\MCB2300\RL\USB\Device\CDC\ to install drivers.
(Or its modifications, basically all text in mcb2300-vcom.inf and usb_config.c were set to “Keil”,and PID, VID changed to corresponding values in usb_config.c).
Everything is compiling, and running. But when I am trying open virtual serial port on my Windows application Putty, usbd_cdc_ser_initport(U32 baudrate, U32 databits, U32 parity, U32 stopbits) is called – with proper parameter values (set in Putty). After that Putty
(same with other similar applications), disappears or is locked. So it does not work at all.
I have installed USBlyzer and all communication looks very similar.

CODE:
*USB_Demo.c

#include <RTL.h>
#include <rl_usb.h>
#include "LED.h"
OS_TID task_id_write;
U64 write_stack [1200/8];
__task void writeTask (void);

__task void init (void) {
  os_tsk_prio_self(1);
  usbd_init();
  usbd_connect(__TRUE);
  os_tsk_prio_self(1);
  task_id_write = os_tsk_create_user (writeTask, 1, &write_stack, sizeof (write_stack));
  while (!usbd_configured()){};
   LED_Val(0x0);
  while (1) {
    usbd_vcom_serial2usb();
    usbd_vcom_chkserstate();
    usbd_vcom_usb2serial();
    os_tsk_pass ();
  }
}

/* buffer type                                                                */
typedef struct __SER_BUF_T {
  unsigned int wrIdx;
  unsigned int rdIdx;
  unsigned char data[128];
} SER_BUF_T;

extern unsigned long         ser_txRestart;    /* NZ if TX restart is required       */
extern unsigned short        ser_lineState;    /* ((msr << 8) | (lsr))               */
extern volatile SER_BUF_T    ser_out;          /* Serial data buffers                */
extern volatile SER_BUF_T    ser_in;

#define SER_BUF_SIZE (128)              /* serial buffer in bytes (power 2)   */
#define SER_BUF_MASK (SER_BUF_SIZE-1ul) /* buffer size mask                   */

/* Buffer read / write macros                                                 */
#define SER_BUF_RESET(serBuf)      (serBuf.rdIdx = serBuf.wrIdx = 0)
#define SER_BUF_WR(serBuf, dataIn) (serBuf.data[SER_BUF_MASK & serBuf.wrIdx++] = (dataIn))
#define SER_BUF_RD(serBuf, dataOut) serBuf.rdIdx++; dataOut = serBuf.data[SER_BUF_MASK & (serBuf.rdIdx-1)];
#define SER_BUF_EMPTY(serBuf)      (serBuf.rdIdx == serBuf.wrIdx)
#define SER_BUF_FULL(serBuf)       ((SER_BUF_MASK & serBuf.rdIdx) == (SER_BUF_MASK & (serBuf.wrIdx+1)))
#define SER_BUF_COUNT(serBuf)      (SER_BUF_MASK & (serBuf.wrIdx - serBuf.rdIdx))

__task void writeTask (void)
{
        SER_BUF_RESET(ser_in);
        while(1)
        {
  SER_BUF_WR(ser_in, 'a');
  os_tsk_pass ();

        }
}

int main (void) {
  LED_Init();
  LED_Val(0xFF);
  os_sys_init(init);                    /* Init RTX and start 'init'          */
}

By the way I can see in USBlyzer characters ('a') which I want to sent to PC Host, just after I connect the device to USB.

Reply

0 John Ostrowski over 12 years ago in reply to Nick C.

CODE:
*USB_Demo.c

#include <RTL.h>
#include <rl_usb.h>
#include "LED.h"
OS_TID task_id_write;
U64 write_stack [1200/8];
__task void writeTask (void);

__task void init (void) {
  os_tsk_prio_self(1);
  usbd_init();
  usbd_connect(__TRUE);
  os_tsk_prio_self(1);
  task_id_write = os_tsk_create_user (writeTask, 1, &write_stack, sizeof (write_stack));
  while (!usbd_configured()){};
   LED_Val(0x0);
  while (1) {
    usbd_vcom_serial2usb();
    usbd_vcom_chkserstate();
    usbd_vcom_usb2serial();
    os_tsk_pass ();
  }
}

/* buffer type                                                                */
typedef struct __SER_BUF_T {
  unsigned int wrIdx;
  unsigned int rdIdx;
  unsigned char data[128];
} SER_BUF_T;

extern unsigned long         ser_txRestart;    /* NZ if TX restart is required       */
extern unsigned short        ser_lineState;    /* ((msr << 8) | (lsr))               */
extern volatile SER_BUF_T    ser_out;          /* Serial data buffers                */
extern volatile SER_BUF_T    ser_in;

#define SER_BUF_SIZE (128)              /* serial buffer in bytes (power 2)   */
#define SER_BUF_MASK (SER_BUF_SIZE-1ul) /* buffer size mask                   */

/* Buffer read / write macros                                                 */
#define SER_BUF_RESET(serBuf)      (serBuf.rdIdx = serBuf.wrIdx = 0)
#define SER_BUF_WR(serBuf, dataIn) (serBuf.data[SER_BUF_MASK & serBuf.wrIdx++] = (dataIn))
#define SER_BUF_RD(serBuf, dataOut) serBuf.rdIdx++; dataOut = serBuf.data[SER_BUF_MASK & (serBuf.rdIdx-1)];
#define SER_BUF_EMPTY(serBuf)      (serBuf.rdIdx == serBuf.wrIdx)
#define SER_BUF_FULL(serBuf)       ((SER_BUF_MASK & serBuf.rdIdx) == (SER_BUF_MASK & (serBuf.wrIdx+1)))
#define SER_BUF_COUNT(serBuf)      (SER_BUF_MASK & (serBuf.wrIdx - serBuf.rdIdx))

__task void writeTask (void)
{
        SER_BUF_RESET(ser_in);
        while(1)
        {
  SER_BUF_WR(ser_in, 'a');
  os_tsk_pass ();

        }
}

int main (void) {
  LED_Init();
  LED_Val(0xFF);
  os_sys_init(init);                    /* Init RTX and start 'init'          */
}

By the way I can see in USBlyzer characters ('a') which I want to sent to PC Host, just after I connect the device to USB.

Children

0 Ezequiel Brizzio over 12 years ago in reply to John Ostrowski

Hi John,
As you, I tried to convert a HID example into CDC with same problems that you run through.
Did you find the solution?
Thanks,
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0 John Ostrowski over 12 years ago in reply to Ezequiel Brizzio

Hi Ezequiel Brizzio,

There is new version of RL library, but I did not manage to make it work (I tried once to port example). So I downloaded Freescale's USB stack, and using that solution.

Regards,
John
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