auto baudrate detection

[lpcware]

Content originally posted in LPCWare by ianLWD on Mon May 04 05:01:01 MST 2015
hi there!

For a project i want to edit the LPCopen canbus example program so it can automatically detect the baud rate. I have found a way how to do that.

http://www.can-cia.org/fileadmin/cia/files/icc/9/koppe.pdf

The microcontroller I'm using is the LPC11C24.
I want to set the cancontroller into silent mode so it will not generate error frames which will disrupt the canbus. I have no clue on how to set the registers. I know CMSIS uses LPC11xx.h to acces te registers. But I cannot find something simular for LPCopen.

So can anyone help me on how i can set the registers? In the userguide the registers are CANCNTL (0x4005 0000 bit 7 page 286 User Guide UM10398) And CANTEST (0x4005 0014 bit 3 page 291 User Guide UM10398).

With kind regards,

IanLWD

[lpcware]

Content originally posted in LPCWare by ianLWD on Wed May 06 05:45:37 MST 2015
Hi R2D2,

I have started a project for a 6digits 14segments display. the display uses the canbus to link with a PLC.
I'm using the NXP_lpcxpresso_11C24_periph_Ccan_rom example. this example is from LPCopen.
I added some own code for the display.

Now I want to change some registers so I can program a automatic Baudrate detection.

atm I'm using LPCxpresso as compiler with default settings.


I hope this will make some sense.

thanks for helping me.

With kind regards,
ianlwd

[lpcware]

Content originally posted in LPCWare by R2D2 on Wed May 06 05:31:48 MST 2015

---

Quote: ianLWD
thanks for your reply, but it is still unclear what to do.

---

...because it's unclear what you are doing 

You don't describe your toolchain and you don't post your project (and if LPCOpen, the board library)

So I can just guess what you are doing

BTW: The correct name is:

 LPC_CAN[color=#f00]0[/color]->CNTL ...

---

Quote: ianLWD
'LPC_CAN' undeclared (first use in this function)"

---

... 'not declared' usually means that there is no correct declaration, that's this thing:

#define LPC_CAN0           ((LPC_CAN_TypeDef    *) LPC_CAN0_BASE)

[lpcware]

Content originally posted in LPCWare by ianLWD on Wed May 06 04:16:24 MST 2015
Hello R2D2,

thanks for your reply, but it is still unclear what to do.

Where do I add the can struct?
I found the same struct in the LPC11xx.h
I allready tried to add the struct in the following header files:
  board.h
  ccand_11xx.h
  chip.h

it didnt work for me.

 
LPC_CAN->CNTL (1<<7);
after using this code,the error is : " 'LPC_CAN' undeclared (first use in this function)"

I hope you can help me with this.

with kind regards,
ianlwd

[lpcware]

Content originally posted in LPCWare by R2D2 on Mon May 04 07:51:55 MST 2015
There a missing a few things in LPCOpen 

Just add a CAN struct:

/*------------- CAN Controller (CAN) ----------------------------*/
/** @addtogroup LPC11xx_CAN LPC11xx Controller Area Network(CAN)
  @{
*/
typedef struct
{
  __IO uint32_t CNTL;/* 0x000 */
  __IO uint32_t STAT;
  __IO uint32_t EC;
  __IO uint32_t BT;
  __IO uint32_t INT;
  __IO uint32_t TEST;
  __IO uint32_t BRPE;
       uint32_t RESERVED0;
  __IO uint32_t IF1_CMDREQ;/* 0x020 */
  __IO uint32_t IF1_CMDMSK;
  __IO uint32_t IF1_MSK1;
  __IO uint32_t IF1_MSK2;
  __IO uint32_t IF1_ARB1;
  __IO uint32_t IF1_ARB2;
  __IO uint32_t IF1_MCTRL;
  __IO uint32_t IF1_DA1;
  __IO uint32_t IF1_DA2;
  __IO uint32_t IF1_DB1;
  __IO uint32_t IF1_DB2;
       uint32_t RESERVED1[13];
  __IO uint32_t IF2_CMDREQ;/* 0x080 */
  __IO uint32_t IF2_CMDMSK;
  __IO uint32_t IF2_MSK1;
  __IO uint32_t IF2_MSK2;
  __IO uint32_t IF2_ARB1;
  __IO uint32_t IF2_ARB2;
  __IO uint32_t IF2_MCTRL;
  __IO uint32_t IF2_DA1;
  __IO uint32_t IF2_DA2;
  __IO uint32_t IF2_DB1;
  __IO uint32_t IF2_DB2;
       uint32_t RESERVED2[21];
  __I  uint32_t TXREQ1;/* 0x100 */
  __I  uint32_t TXREQ2;
       uint32_t RESERVED3[6];
  __I  uint32_t ND1;/* 0x120 */
  __I  uint32_t ND2;
       uint32_t RESERVED4[6];
  __I  uint32_t IR1;/* 0x140 */
  __I  uint32_t IR2;
       uint32_t RESERVED5[6];
  __I  uint32_t MSGV1;/* 0x160 */
  __I  uint32_t MSGV2;
       uint32_t RESERVED6[6];
  __IO uint32_t CLKDIV;/* 0x180 */
} LPC_CAN_TypeDef;
/*@}*/ /* end of group LPC11xx_CAN */

#define LPC_CAN0           ((LPC_CAN_TypeDef    *) LPC_CAN0_BASE)

BTW: That's a known issue  :((

http://www.lpcware.com/content/forum/forgotten-can-register-struct-lpcxpresso-lpc11c24-lpcopen-v200a