Visitor II

Question

HDLC

Forum|Forum|19 years ago
September 24, 2006
7 replies
1799 views

Posted on September 25, 2006 at 01:46

HDLC

This topic has been closed for replies.

H

huashilongAuthor

Visitor II

Posted on September 15, 2006 at 00:26

Dear Hich

I'm in hurry to implement RF unit with FM0/NRZI encoding, so l'm anxious to know the HDLC limitations. Can you give me some information about the HDLC limitations? thank you very much,

Regards,

lisihua2000@tom.com

H

hichem2

Visitor II

Posted on September 18, 2006 at 12:03

Hi,

Could you please tell me what kind of limitations can cause you o lot of worry.

With regards,

Hich

H

huashilongAuthor

Visitor II

Posted on September 19, 2006 at 00:58

I know that REN and TEN bits are swapped on readback. I have got over the limitation in my program. My program can work well with NRZ/NRZI encoding now, but it can't work with FM0/MANCH encoding. I'm not sure the mistake is took by me or str71x. Could you please help me? thank you very much!

here is the code :

//=============================================================================

#define CODE_NRZ 0

#define CODE_NRZI 1

#define CODE_FM0 2

#define CODE_MANCH 3

void HDLC_Init(unsigned char tx_code,unsigned int tx_bps,unsigned char rx_code,unsigned int rx_bps)

{

HDLC->GA1 = 0;

HDLC->GA0 = 0;

HDLC->GAM1 = 0;

HDLC->GAM0 = 0;

HDLC->PRES = 0;

HDLC->POSS = 0;

HDLC->TCTL = 0;

HDLC->RCTL = 0;

HDLC->BRR = 0;

HDLC->PRSR = 0;

HDLC->TFBCR = 0;

HDLC->RFBCR = 0;

HDLC->PCR = 0;

HDLC->ISR = 0;

HDLC->IMR = 0;

HDLC->PARH = 0;

HDLC->PAMH = 0;

HDLC->PARL = 0x00AA;

HDLC->PAML = 0x00FF;

GPIO_Config (GPIO1, 0x2000, GPIO_IN_TRI_CMOS);

GPIO_Config (GPIO1, 0x4000, GPIO_IN_TRI_CMOS);

GPIO_Config (GPIO1, 0x8000, GPIO_AF_PP);

if((tx_code==CODE_NRZ)||(tx_code==CODE_NRZI))

{

HDLC->TCTL = (((unsigned short)1)<

HDLC->BRR = ((RCCU_FrequencyValue(RCCU_FCLK)/tx_bps-1) & 0x0FFF);

}

else //((tx_code==CODE_FM0)||(tx_code==CODE_MANCH)

{

HDLC->TCTL = (((unsigned short)1)<

HDLC->BRR = ((RCCU_FrequencyValue(RCCU_FCLK)/tx_bps/2-1) & 0x0FFF);

}

if((rx_code==CODE_NRZ)||(rx_code==CODE_NRZI))

{

HDLC->RCTL = (((unsigned short)1)<

HDLC->PRSR = ((RCCU_FrequencyValue(RCCU_FCLK)/rx_bps-1) & 0x00FF);

}

else //((tx_code==CODE_FM0)||(tx_code==CODE_MANCH))

{

HDLC->RCTL = (((unsigned short)1)<

HDLC->PRSR = ((RCCU_FrequencyValue(RCCU_FCLK)/rx_bps/2-1) & 0x00FF);

}

Y

yahoo1

Visitor II

Posted on September 21, 2006 at 17:08

Hi,

I received an offical answer for ST to the same question. I have attached this draft document. I'm worry to use the HDLC unit for my application whitch is possible similar to your. But in any case I will use STR7.

Kind Regards

Ioannis

H

huashilongAuthor

Visitor II

Posted on September 22, 2006 at 06:30

Dear elcom,

Thank you very much for your reply, I can't find the document you attached. Could you please attach it again or email to me?

thank you very much

Kind Regards

huashilong

Y