RCM6700 RS485

Rabbit Rabbit Software
,
1

Hello

anyone have RS485 code for RCM6700? I had modified the BLXS2XX’s RS485 code, then run, it always"Starting sync up with the other controller" in the stdio, where the issues?

Thanks!

2

Modified how?

The RCM6700 does not have an RS485 chip on it. To add an external RS485 chip you will need to write the driver for it.

3

I had welded RS485 chips(SP3072EE) on them.
connect first RCM57/67xx serial board RS485+ to second RS485+,RS485- to RS485-, GND to GND.
this is my cod, would you pls check?

  1. master.c
    #class auto

// include BLxS2xx series lbrary
#use “RS485.lib”

//#if BOARD_TYPE == RCM4010 // BL4S210
// #define SER_NO_FLOWCONTROL
//#endif

// serial setup
#define FINBUFSIZE 255
#define FOUTBUFSIZE 255
#define ser485open serFopen
#define ser485wrFlush serFwrFlush
#define ser485rdFlush serFrdFlush
#define ser485putc serFputc
#define ser485getc serFgetc

nodebug
void msDelay(unsigned int delay)
{
unsigned long done_time;

done_time = MS_TIMER + delay;

while( (long) (MS_TIMER - done_time) < 0 );
}

///////////////////////////////////////////////////////////////////////////

void main()
{
int nIn1;
char cOut;

// Initialize the controller
brdInit();

ser485open(57600);	// Set baud rate first

ser485wrFlush();		// Clear Rx and Tx data buffers
ser485rdFlush();

// Initializes serial mode and disables RS-485 transmitter
serMode(0);

// Sync up to the slave controller
printf ("Starting sync up with the other controller.\r");
cOut = 0x55;
do
{
	ser485Tx();							            // enable transmitter
	ser485putc ( cOut );				            // send lowercase byte
	while ((nIn1 = ser485getc()) == -1);      // wait for echo
	ser485Rx();							            // disable transmitter
	msDelay(5);
	if ((nIn1 = ser485getc ()) == -1)	      // check for reply
	{
		printf ("Waiting to sync up to the other controller.\r");
	}
} while (nIn1 != cOut);

while (1)
{
	for (cOut='a';cOut&lt;='z';++cOut)
	{
		ser485Tx();										//	enable transmitter
		ser485putc ( cOut );							//	send lowercase byte
		while (ser485getc() == -1);				//	wait for echo
		ser485Rx();										// disable transmitter

		while ((nIn1 = ser485getc ()) == -1);	//	wait for reply
		if (nIn1 == (toupper(cOut)))
     {
			printf ("

\rUpper case %c is %c
“, cOut, nIn1 );
}
else
{
printf (”
\rERROR: Sent %c and received %c
", cOut, nIn1 );
}
}
}
}

  1. slave.c
    #class auto

// include BLxS2xx series lbrary
#use “RS485.lib”

//#if BOARD_TYPE == RCM4010 // BL4S210
// #define SER_NO_FLOWCONTROL
//#endif

// serial buffer size
#define FINBUFSIZE 255
#define FOUTBUFSIZE 255
#define ser485open serFopen
#define ser485wrFlush serFwrFlush
#define ser485rdFlush serFrdFlush
#define ser485putc serFputc
#define ser485getc serFgetc

///////////////////////////////////////////////////////////////////////////
void main()
{
auto int i, nIn1;

// Initialize the controller
brdInit();

ser485open(57600);		// Set baud rate first
ser485wrFlush();			// Clear Rx and Tx data buffers
ser485rdFlush();

// Initializes serial mode and disables RS-485 transmitter
serMode(0);

while (1)
{
	while ((nIn1 = ser485getc()) == -1);	//	Wait for lowercase ascii byte
  for (i = ((freq_divider*3) &gt;&gt; 1); --i; ); // Delay before transmit
	ser485Tx();										//	Enable transmitter
	ser485putc ( toupper(nIn1) );				//	Echo uppercase byte
	while (ser485getc() == -1);				//	Wait for echo
	ser485Rx();										//	Disable transmitter
}

}

  1. the lib is copy BLxSxx.lib,and named RS485.c, the follow is the part of modify.
    #if BLXS200_SERIES
    #fatal “This library is for BLxS2xx series SBC boards only.”
    #endif

#define SxER SFER
#define SxERShadow SFERShadow

#if BOARD_TYPE == RCM4010
// available RS232 serial port B uses default port/pins
// available RS485 serial port C uses default port/pins
#define SET_GS(X) BitWrPortI(PFDR,&PFDRShadow,X,2)
#define BL_BUSY_REG PFDR
#define BL_BUSY_BIT 0
#else
#define SET_GS(X) BitWrPortI(PFDR,&PFDRShadow,X,4)
#define BL_BUSY_REG PFDR
#define BL_BUSY_BIT 4
#endif