[ts-7000] ts-7200 & ts-7400 SPI & DIO compatiblity.

["Art" <>]

I am currently using the DIO and the SPI of a 7200 board for
communications with our IO board.  Now how much changes in the 7400 as
compared to the 7200 board.  Do I have different address locations to
use for the communications?  Any changes in the speed and
configuration of the SPI lines.   I'll include sample code that I use
for the 7200 board to setup and communicate.  

volatile unsigned int *SSPCR0, *SSPCR1, *SSPDR, *SSPSR, *SSPCPSR,
*SSPIIR, *SSPICR;
volatile unsigned int *PEDR, *PEDDR, *PBDR, *PBDDR, *GPIOBDB;

#define SPI_SEND_BUFF_FULL  ((*SSPSR & 0x2) == 0)
#define SPI_SEND_BUFF_EMPTY ((*SSPSR & 0x1) == 1)
#define SPI_READ_BUFF_FULL ((*SSPSR & 0x8) == 8)
#define SPI_READ_BUFF_EMPTY ((*SSPSR & 0x4) == 0)
#define SPI_BUSY ((*SSPSR & 0x10) == 0x10)

void SPI_SETUP(void)
{
  unsigned char *start2;
  int fd = open("/dev/mem", O_RDWR);
  TRACE(printf("SPI_SETUP()\n"));
  start2 = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED,
fd, 0x808A0000);
   // SPI registers
   SSPCR0 = (unsigned int *)(start2 + 0); // Control register 0
   SSPCR1 = (unsigned int *)(start2 + 4); // Control register 1
   SSPDR = (unsigned int *)(start2 + 8); // Data Recieve / Data Transmit
   SSPSR = (unsigned int *)(start2 + 0xc); // SPI Status Register
   SSPCPSR = (unsigned int *)(start2 + 0x10); // SPI Clock Prescale
register
   SSPIIR = (unsigned int *)(start2 + 0x14); // Int ID register
   SSPICR = (unsigned int *)(start2 + 0x14); // Int Clr register;
  close(fd);
   *SSPCR1 = 0x0;  // Master nothing special CLEAR SSE
   *SSPCR1 = 0x10; //set SSE
   *SSPCPSR = 8; // Set SPI Speed this must be even
   *SSPCR0 = 0x807; // SCR = 254; DSS = 8 bit;
   *SSPCR1 = 0x0;  // Master nothing special CLEAR SSE
   *SSPCR1 = 0x10; //set SSE
}

void DIO_SETUP(void)
{
  unsigned char *start;
   int fd = open("/dev/mem", O_RDWR);
   TRACE(printf("DIO_SETUP()\n"));
   start = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED,
fd, 0x80840000);
   // DIO registers
   PBDR = (unsigned int *)(start + 0x04);     // port b
   PBDDR = (unsigned int *)(start + 0x14);    // port b direction register
   PEDR = (unsigned int *)(start + 0x20);     // port e data
   PEDDR = (unsigned int *)(start + 0x24);    // port e direction register
   GPIOBDB = (unsigned int *)(start + 0xC4);  // debounce on port b

   *PBDDR = 0xff;                             // upper nibble output,
lower nibble input
   *PEDDR = 0xff;                             // all output (just 2 bits)
   *GPIOBDB = 0x01;                           // enable debounce on bit 0
   close(fd);
}

void SPI_Send(unsigned char data)
{
  while (SPI_SEND_BUFF_FULL);
  CONTINUE(printf("%x-",data));
  *SSPDR = data;
}

unsigned int SPI_Read(void)
{
  //static unsigned char olddata = 0;
  unsigned char data = *SSPDR;
  //while (SPI_READ_BUFF_EMPTY); printf(".");
  //DEBUG(printf("%x:",data));
  //if (data!=olddata) printf("%x-",data);
  //olddata = data;
  return data;
}

unsigned int SPI_ReadSend(unsigned int data)
{
  long liTest;
  unsigned char datax;
  while (SPI_SEND_BUFF_FULL);
  *SSPDR = data;
  datax = *SSPDR;
  return datax; // Send Back data received
}

// I use the DIO to select the chip I wish to talk SPI.

void SetAddress(unsigned int address)
{
  static int liAddress = 0;
  int liLoop;
  if (liAddress==address) return;
  liAddress = address;
  while (!SPI_SEND_BUFF_EMPTY);
  while (SPI_BUSY);
  *PBDR = (*PBDR&0xf0)|(address&0xf);
}


Art McGee
www.edionline.com
1675 nw Cornelius Pass Road
Hillsboro, Oregon  97124






 
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