example_2833xi2c_rtc.c

TMS32028335 的一些例程

// TI File $Revision: /main/9 $
// Checkin $Date: August 10, 2007   09:05:58 $
//###########################################################################
//
// FILE:    Example_2833xI2c_rtc.c
//
// TITLE:   DSP2833x I2C RTC Example
//
// ASSUMPTIONS:
//
//    This program requires the DSP2833x header files.
//
//    This program requires an external I2C RTC connected to
//    the I2C bus at address 0x6f.
//
//    As supplied, this project is configured for "boot to SARAM"
//    operation.  The 2833x Boot Mode table is shown below.
//    For information on configuring the boot mode of an eZdsp,
//    please refer to the documentation included with the eZdsp,
//
//       $Boot_Table:
//
//         GPIO87   GPIO86     GPIO85   GPIO84
//          XA15     XA14       XA13     XA12
//           PU       PU         PU       PU
//        ==========================================
//            1        1          1        1    Jump to Flash
//            1        1          1        0    SCI-A boot
//            1        1          0        1    SPI-A boot
//            1        1          0        0    I2C-A boot
//            1        0          1        1    eCAN-A boot
//            1        0          1        0    McBSP-A boot
//            1        0          0        1    Jump to XINTF x16
//            1        0          0        0    Jump to XINTF x32
//            0        1          1        1    Jump to OTP
//            0        1          1        0    Parallel GPIO I/O boot
//            0        1          0        1    Parallel XINTF boot
//            0        1          0        0    Jump to SARAM	    <- "boot to SARAM"
//            0        0          1        1    Branch to check boot mode
//            0        0          1        0    Boot to flash, bypass ADC cal
//            0        0          0        1    Boot to SARAM, bypass ADC cal
//            0        0          0        0    Boot to SCI-A, bypass ADC cal
//                                              Boot_Table_End$
//
// DESCRIPTION:
//
//    This program will write 1-14 words to RTC and read them back.
//    The data written and the RTC address written to are contained
//    in the message structure, I2cMsgOut1. The data read back will be
//    contained in the message structure I2cMsgIn1.
//
//    This program will work with the on-board I2C RTC supplied on
//    the F2833x eZdsp.
//
//
//###########################################################################
// Original Author: D.F.
//
// $TI Release: DSP2833x Header Files V1.01 $
// $Release Date: September 26, 2007 $
//###########################################################################


#include "DSP2833x_Device.h"     // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h"   // DSP2833x Examples Include File

// Note: I2C Macros used in this example can be found in the
// DSP2833x_I2C_defines.h file

// Prototype statements for functions found within this file.
void   I2CA_Init(void);
Uint16 I2CA_WriteData(struct I2CMSG *msg);
Uint16 I2CA_ReadData(struct I2CMSG *msg);
void   WriteData(struct I2CMSG *msg,Uint16 *MsgBuffer,Uint16 MemoryAdd,Uint16 NumOfBytes);
interrupt void i2c_int1a_isr(void);
void pass(void);
void fail(void);

#define I2C_SLAVE_ADDR       0x6f
#define I2C_NUMBYTES          1
#define I2C_RNUMBYTES         8
#define I2C_RTC_HIGH_ADDR  0x00
#define I2C_RTC_LOW_ADDR   0x30

Uint16	YEAR = 0x2007;
Uint16	MONTH = 0x12;
Uint16	DAY = 0x03;
Uint16	WEEK = 0x01;
Uint16	HOUR = 0x15;
Uint16	MINUTE = 0x10;
Uint16	SECOND = 0x00;

#define	Y2K		0x0037
#define	DW		0x0036
#define	YR		0x0035
#define	MO		0x0034
#define	DT		0x0033
#define	HR		0x0032
#define	MN		0x0031
#define	SC		0x0030

// Global variables
// Two bytes will be used for the outgoing address,
struct I2CMSG I2cMsgOut1={I2C_MSGSTAT_SEND_WITHSTOP,
                          I2C_SLAVE_ADDR,
                          I2C_NUMBYTES,
                          I2C_RTC_HIGH_ADDR,
                          I2C_RTC_LOW_ADDR};


struct I2CMSG I2cMsgIn1={ I2C_MSGSTAT_SEND_NOSTOP,
                          I2C_SLAVE_ADDR,
                          I2C_RNUMBYTES,
                          I2C_RTC_HIGH_ADDR,
                          I2C_RTC_LOW_ADDR};

struct I2CMSG *CurrentMsgPtr;				// Used in interrupts
Uint16 PassCount;
Uint16 FailCount;

void main(void)
{
   Uint16 i;

   CurrentMsgPtr = &I2cMsgOut1;

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
   InitSysCtrl();


// Step 2. Initalize GPIO:
// This example function is found in the DSP2833x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();
// Setup only the GP I/O only for I2C functionality
   InitI2CGpio();

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
   DINT;

// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2833x_PieCtrl.c file.
   InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_PieVect.c.
   InitPieVectTable();

// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
   EALLOW;	// This is needed to write to EALLOW protected registers
   PieVectTable.I2CINT1A = &i2c_int1a_isr;
   EDIS;   // This is needed to disable write to EALLOW protected registers

// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2833x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
   I2CA_Init();

// Step 5. User specific code

// Enable interrupts required for this example

// Enable I2C interrupt 1 in the PIE: Group 8 interrupt 1
   PieCtrlRegs.PIEIER8.bit.INTx1 = 1;

// Enable CPU INT8 which is connected to PIE group 8
   IER |= M_INT8;
   EINT;

   // Application loop
   for(;;)
   {
      //////////////////////////////////
      // Write data to RTC CTRL section //
      //////////////////////////////////

      // Check the outgoing message to see if it should be sent.
      // In this example it is initialized to send with a stop bit.
      if(I2cMsgOut1.MsgStatus == I2C_MSGSTAT_SEND_WITHSTOP)
      {
		 i = 0x02;
		 WriteData(&I2cMsgOut1,&i,0x003f,1);
		 i = 0x06;
		 WriteData(&I2cMsgOut1,&i,0x003f,1);

		 i = YEAR >> 8;
		 WriteData(&I2cMsgOut1,&i,Y2K,1);
		 i = YEAR & 0xff;
		 WriteData(&I2cMsgOut1,&i,YR,1);
		 i = MONTH;
		 WriteData(&I2cMsgOut1,&i,MO,1);
		 i = DAY;
		 WriteData(&I2cMsgOut1,&i,DT,1);
		 i = WEEK;
		 WriteData(&I2cMsgOut1,&i,DW,1);
		 i = HOUR;
		 WriteData(&I2cMsgOut1,&i,HR,1);
		 i = MINUTE;
		 WriteData(&I2cMsgOut1,&i,MN,1);
		 i = SECOND;
		 WriteData(&I2cMsgOut1,&i,SC,1);

      }  // end of write section

      ///////////////////////////////////
      // Read data from RTC section //
      ///////////////////////////////////

      // Check outgoing message status. Bypass read section if status is
      // not inactive.
      if (I2cMsgOut1.MsgStatus == I2C_MSGSTAT_INACTIVE)
      {
         // Check incoming message status.
         if(I2cMsgIn1.MsgStatus == I2C_MSGSTAT_SEND_NOSTOP)
         {
            // RTC address setup portion
            while(I2CA_ReadData(&I2cMsgIn1) != I2C_SUCCESS)
            {
               // Maybe setup an attempt counter to break an infinite while
               // loop. The RTC will send back a NACK while it is performing
               // a write operation. Even though the write communique is
               // complete at this point, the RTC could still be busy
               // programming the data. Therefore, multiple attempts are
               // necessary.
            }
            // Update current message pointer and message status
            CurrentMsgPtr = &I2cMsgIn1;
            I2cMsgIn1.MsgStatus = I2C_MSGSTAT_SEND_NOSTOP_BUSY;
         }