example_281xgpioloopback.c

TMS320F2812源程序“gpio_loopback”希望对大家有点帮助

    
    Test_status[Test_var] = 0x0003;
    Test_var++;
    
    Test_status[Test_var] = 0xD0BE;      // Set the default value of status 
                                         // to "PASSED"
    test_count = 0;
                                        
    while (test_count < 4)               // repeat the tests 4 times
    {
       GpioDataRegs.GPBSET.all = 0xFF00;
       delay_loop();

       GpioDataRegs.GPACLEAR.all = 0xFF00;  // Test Clear
       asm (" RPT #14 || NOP");             // Delay < ( 6 * 2 ) CPUCLK cycles
       Test_flag = GpioDataRegs.GPADAT.all;
       if ( Test_flag == 0x0000 ) error(1);
                            
       GpioDataRegs.GPASET.all = 0x5500;    // Test Set
       asm(" RPT #14 ||NOP");                         
       Test_flag = GpioDataRegs.GPADAT.all;
       if ( Test_flag == 0x5555 ) error(1);
    
       GpioDataRegs.GPATOGGLE.all = 0xFF00; // Test Toggle 
       asm(" RPT #14 ||NOP");
       Test_flag = GpioDataRegs.GPADAT.all;
       if ( Test_flag == 0xAAAA ) error(1);
    
       test_count++; 
    
    }
    
    Test_var++;
    
// Test #3B: Set delay so that the input is qualified successfully 
// delay must be >= ( 6 * 2 * QUALVAL ) CPUCLK cycles

    Test_status[Test_var] = 0x0004;
    Test_var++;
    
    Test_status[Test_var] = 0xD0BE;      // Set the default value of status 
                                         // to "PASSED"
    test_count = 0;
                                        
    while (test_count < 4)               // repeat the tests 4 times
    {
       GpioDataRegs.GPASET.all = 0xFF00;
       delay_loop();

       GpioDataRegs.GPACLEAR.all = 0xFF00;  // Test Clear    
       asm (" RPT #16 || NOP");             // Delay = (6 * 2 * 1) CPUCLK cycles
       Test_flag = GpioDataRegs.GPADAT.all;
       if ( Test_flag != 0x0000 ) error(1);
                            
       GpioDataRegs.GPASET.all = 0x5500;    // Test Set
       asm(" RPT #16 ||NOP");                         
       Test_flag = GpioDataRegs.GPADAT.all;
       if ( Test_flag != 0x5555 ) error(1);
    
       GpioDataRegs.GPATOGGLE.all = 0xFF00; // Test Toggle 
       asm(" RPT #16 ||NOP");
       Test_flag = GpioDataRegs.GPADAT.all;
       if ( Test_flag != 0xAAAA ) error(1);
    
       test_count++; 
    
    }
    
    Test_var++;    

} // End of Test #3


void Gpio_PortB(void)
{

// GPIO Test #4: 
// Configure Upper 8 bits of Port B as outputs and lower 8 bits as inputs    
// Loop back bits [15:8] to bits [7:0]
// Set input qualifier to 0x0002
 
    var1= 0x0000;        // sets GPIO Muxs as I/Os
    var2= 0xFF00;        // sets GPIO 15-8 DIR as outputs, 7-0 as inputs.
    var3= 0x0002;        // Set input qualifier to 2
        
    Gpio_select();
    
// Test #4A: Set delay so that the input gets rejected.    
// Delay must be < ( 6 * 2 * QUALVAL ) CPUCLK cycles

    Test_status[Test_var] = 0x0005;
    Test_var++;
    
    Test_status[Test_var] = 0xD0BE;      // Set the default value of status 
                                         // to "PASSED"
    test_count = 0;
                                        
    while (test_count < 4)               // repeat the tests 4 times
    {
       GpioDataRegs.GPBSET.all = 0xFF00;
       delay_loop();

       GpioDataRegs.GPBCLEAR.all = 0xFF00;  // Test Clear    
       asm (" RPT #24 || NOP");             // Delay < (6 * 2 * 2) CPUCLK cycles
       Test_flag = GpioDataRegs.GPBDAT.all;
       if ( Test_flag == 0x0000 ) error(1);
                            
       GpioDataRegs.GPBSET.all = 0x5500;    // Test Set
       asm(" RPT #24 ||NOP");                         
       Test_flag = GpioDataRegs.GPBDAT.all;
       if ( Test_flag == 0x5555 ) error(1);
    
       GpioDataRegs.GPBTOGGLE.all = 0xFF00; // Test Toggle 
       asm(" RPT #24 ||NOP");
       Test_flag = GpioDataRegs.GPBDAT.all;
       if ( Test_flag == 0xAAAA ) error(1);
    
       test_count++; 
    
    }
    
    Test_var++;
    
// Test #4B: Set delay so that the input is qualified successfully 
// Delay must be >= ( 6 * 2 * QUALVAL ) CPUCLK cycles

    Test_status[Test_var] = 0x0006;
    Test_var++;
    
    Test_status[Test_var] = 0xD0BE;      // Set the default value of status 
                                         // to "PASSED"
    test_count = 0;
                                        
    while (test_count < 4)               // repeat the tests 4 times
    {
       GpioDataRegs.GPBSET.all = 0xFF00;
       delay_loop();

       GpioDataRegs.GPBCLEAR.all = 0xFF00;  // Test Clear    
       asm (" RPT #29 || NOP");             // Delay = (6 * 2 * 2) CPUCLK cycles
       Test_flag = GpioDataRegs.GPBDAT.all;
       if ( Test_flag != 0x0000 ) error(1);
                            
       GpioDataRegs.GPBSET.all = 0x5500;    // Test Set
       asm(" RPT #29 ||NOP");                         
       Test_flag = GpioDataRegs.GPBDAT.all;
       if ( Test_flag != 0x5555 ) error(1);
    
       GpioDataRegs.GPBTOGGLE.all = 0xFF00; // Test Toggle 
       asm(" RPT #29 ||NOP");
       Test_flag = GpioDataRegs.GPBDAT.all;
       if ( Test_flag != 0xAAAA ) error(1);
    
       test_count++; 
    
    } 

    Test_var++;    

} // End of Test #4

void Gpio_PortF(void)
{

// GPIO Test #5: 
// Configure Upper bits [14:8] of Port F as outputs and bits [7:0] as inputs    
// Loop back bits [14:8] to bits [6:0], also loopback bit #8, to bit #7
 
    var1= 0x0000;        // sets GPIO Muxs as I/Os
    var2= 0xFF00;        // sets GPIO 14-8 DIR as outputs, 7-0 as inputs.
        
    Gpio_select();
    
    Test_status[Test_var] = 0x0007;
    Test_var++;
    
    Test_status[Test_var] = 0xD0BE;      // Set the default value of status 
                                         // to "PASSED"
    test_count = 0;
                                        
    while (test_count < 4)                  // repeat the tests 4 times
    {
       GpioDataRegs.GPFSET.all = 0xFF00;
       delay_loop();

       GpioDataRegs.GPFCLEAR.all = 0xFF00;  // Test Clear    
       asm (" RPT #6 || NOP");             
       Test_flag = GpioDataRegs.GPFDAT.all;
       if ( Test_flag != 0x0000 ) error(1);
                            
       GpioDataRegs.GPFSET.all = 0x5500;    // Test Set
       asm(" RPT #6 || NOP");                         
       Test_flag = GpioDataRegs.GPFDAT.all;
       if ( Test_flag != 0x55D5 ) error(1);
    
       GpioDataRegs.GPFTOGGLE.all = 0xFF00; // Test Toggle 
       asm(" RPT #6 || NOP");
       Test_flag = GpioDataRegs.GPFDAT.all;
       if ( Test_flag != 0x2A2A ) error(1); 
     
       test_count++; 
    
    }
    
    Test_var++;
    
} // End of Test #5


void delay_loop()
{
    short      i;
    for (i = 0; i < 1000; i++) {}
}

void Gpio_select(void)
{
     EALLOW;
     
    GpioMuxRegs.GPAMUX.all=var1;   // Configure MUXs as digital I/Os or
    GpioMuxRegs.GPBMUX.all=var1;   // peripheral I/Os
    GpioMuxRegs.GPDMUX.all=var1;
    GpioMuxRegs.GPFMUX.all=var1;         
    GpioMuxRegs.GPEMUX.all=var1; 
    GpioMuxRegs.GPGMUX.all=var1;
                                        
    GpioMuxRegs.GPADIR.all=var2;   // GPIO PORTs  as output
    GpioMuxRegs.GPBDIR.all=var2;   // GPIO DIR select GPIOs as output 
    GpioMuxRegs.GPDDIR.all=var2;
    GpioMuxRegs.GPEDIR.all=var2;        
    GpioMuxRegs.GPFDIR.all=var2; 
    GpioMuxRegs.GPGDIR.all=var2;

    GpioMuxRegs.GPAQUAL.all=var3;  // Set GPIO input qualifier values
    GpioMuxRegs.GPBQUAL.all=var3;   
    GpioMuxRegs.GPDQUAL.all=var3;
    GpioMuxRegs.GPEQUAL.all=var3;
 
    EDIS;
     
}     


void error (int ErrorFlag)
{
   PASS_flag = 0xDEAD;               // Test case failed
   Test_status[Test_var] = 0xDEAD;   // Sub-test failed
   return;
}

void program_stop()
{

//All tests are done */    
  if(PASS_flag !=0) 
       PASS_flag=0xDEAD;          // Test code exit here..
  else
       PASS_flag=0xD0BE;          // Test code exit he    
// end all tests      
   asm("     ESTOP0");            // Done!
   for(;;)     { }                // Dummy loop Wait forever
}

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// No more.
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