example_28xgpio.c

TI公司的2812dsp所有程序

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	Example_28xGpio_input.c
//
// TITLE:	DSP28 Device Getting Started Program.
//			In this test, 8 bits of a GPIO Port are configured as outputs
//			and 8 bits of the same port are configured as inputs. The pins 
//			configured as outputs need to be externally looped back to the
//			pins configured as inputs. The output data is read back on the 
//			input pins. These tests are repeated for various qualifier 
//			values and for GPIO ports A, B and F.
//
// 			Similar tests could be written for GPIO ports D, E and G.

// 			Tests for ports A, D and F are being called by seperate functions
//			An external loopback has to be established, before a testcase for 
//			a given port is executed.

//			Refer to the .ebss space for global variables for test status 
// 			If PASS_flag = 0xDOBE then all tests have passed.
// 			If PASS_flag = 0xDEAD then some tests have failed.
// 			Tests are self validating. If a test passes, Test_status array 
//			will have Test code 0x00xx. If this array has 0xDEAD, the test 
//			has failed.
//			Final Break-point = 0xxxxx, PASS_flag is located at 0xxxxx

// Test #1: 
// Configure Upper 8 bits of Port A as outputs and lower 8 bits as inputs	
// Loop back bits [15:8] to bits [7:0]
// Input Qualifier = 0 (Don't set any input qualifier)
// Needs a delay between CLEAR/SET/TOGGLE instruction.
// This test is run 4 times.

// Test #2: 
// Configure Upper 8 bits of Port A as inputs and lower 8 bits as outputs	
// Loop back bits [7:0] to bits [15:8]
// Input Qualifier = 0 (Don't set any input qualifier)
// Needs a delay between CLEAR/SET/TOGGLE instruction.
// This test is run 4 times.

// Test #3: 
// Configure Upper 8 bits of Port A as outputs and lower 8 bits as inputs	
// Loop back bits [15:8] to bits [7:0]
// Input Qualifier, QUALVAL = 1 
// Needs a delay between CLEAR/SET/TOGGLE instruction.
// For a pass, the delay must be >= ( 6 * 2 * QUALVAL ) CPUCLK cycles
// i.e the delay must be >= 12 CPUCLK cyles
// This test is run 4 times.

// 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]
// Input Qualifier,  QUALVAL = 2
// Needs a delay between CLEAR/SET/TOGGLE instruction.
// For a pass, the delay must be >= 24 CPUCLK cycles
// This test is run 4 times.

// Test #5: 
// Configure Upper 7 bits of Port F as outputs and lower 8 bits as inputs	
// Loop back bits [14:8] to bits [6:0], also loopback bit 8 to bit 7
// Needs a delay between CLEAR/SET/TOGGLE instruction.
// This test is run 4 times.
		
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.58| 04 Jul 2002 |T.N.P | EzDSP Alpha Release
//###########################################################################

#include "DSP28_Device.h"
#include "DSP28_Globalprototypes.h"

// Prototype statements for functions found within this file.
// interrupt void ISRTimer2(void);
void delay_loop(void);
void Gpio_select(void);
void error(int);
void program_stop();
void Gpio_PortA(void);
void Gpio_PortB(void);
void Gpio_PortF(void);
void Gpio_PortDEG(void);

unsigned int var1 = 0;
unsigned int var2 = 0;
unsigned int var3 = 0;
unsigned int test_count = 0;
unsigned int Test_flag = 0;
unsigned int Test_var  = 0;
unsigned int Test_status[32];

unsigned int PASS_flag = 0;

void main(void)
{


// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
    // This function is found in the DSP28_SysCtrl.c file.
 	InitSysCtrl();

// Step 2. Select GPIO for the device or for the specific application:
    // This function is found in the DSP28_Gpio.c file.
//	InitGpio(); skip this as this is for GPIO test

// Step 3. Initialize PIE vector table:
    // The PIE vector table is initialized with pointers to shell Interrupt 
    // Service Routines (ISR).  The shell routines are found in DSP28_DefaultIsr.c.
    // Insert user specific ISR code in the appropriate shell ISR routine in 
    // the DSP28_DefaultIsr.c file.

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

    // Initialize Pie Control Registers To Default State:
    // This function is found in the DSP28_PieCtrl.c file.
    InitPieCtrl();

    // Initialize the PIE Vector Table To a Known State:
    // This function is found in DSP28_PieVect.c.
    // This function populates the PIE vector table with pointers
    // to the shell ISR functions found in DSP28_DefaultIsr.c.
    InitPieVectTable();	
	
// Step 4. Initialize all the Device Peripherals to a known state:
    // This function is found in DSP28_InitPeripherals.c
    // InitPeripherals(); skip this for GPIO tests
	
// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:
//	EALLOW;	   // This is needed to write to EALLOW protected registers
//    PieVectTable.TINT2 = &ISRTimer2;
//    EDIS;    // This is needed to disable write to EALLOW protected registers


    // Tests #1, #2, #3
    Gpio_PortA();
    
    // Test #4
    Gpio_PortB();
    
    // Test #5
    Gpio_PortF();

    program_stop();
    
// Step 6. IDLE loop. Just sit and loop forever (optional):    
//    for(;;);
     
}

// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:    
// If local ISRs are used, reassign vector addresses in vector table as
// shown in Step 5
    
  

 

void Gpio_PortA(void)
{    
    
// GPIO Test #1: 
// Configure Upper 8 bits of Port A as outputs and lower 8 bits as inputs    
// Loop back bits [15:8] to bits [7:0]
// Don't set any input qualifier
 
    var1= 0x0000;        // sets GPIO Muxs as I/Os
    var2= 0xFF00;        // sets GPIO 15-8 DIR as outputs, 7-0 DIR as inputs
    var3= 0x0000;        // Don't set any input qualifier
    
    Gpio_select();    
    
    test_count = 0;
    Test_status[Test_var] = 0x0001;
    Test_var++;
    
    Test_status[Test_var] = 0xD0BE;      // Set the default value of status 
                                         // to "PASSED"
        
    while (test_count < 4) {             // repeat the tests 4 times
    
    GpioDataRegs.GPACLEAR.all = 0xFF00;  // Test Clear
    asm(" RPT #5 ||NOP");                         
    Test_flag = GpioDataRegs.GPADAT.all;
    
    if ( Test_flag != 0x0000 ) error(1);
    
    GpioDataRegs.GPASET.all = 0x5500;    // Test Set
    asm(" RPT #5 ||NOP");                         
    Test_flag = GpioDataRegs.GPADAT.all;
    
    if ( Test_flag != 0x5555 ) error(1);
    
    GpioDataRegs.GPATOGGLE.all = 0xFF00; // Test Toggle 
    asm(" RPT #5 ||NOP");
    Test_flag = GpioDataRegs.GPADAT.all;
    
    if ( Test_flag != 0xAAAA ) error(1);
    
    test_count++;
    
    }

    Test_var++;
    
// End of Test #1

// GPIO Test #2: 
// Configure Upper 8 bits of Port as inputs and lower 8 bits as outputs    
// Loop back bits [7:0] to bits [15:8]
// Don't set any input qualifier
 
    var1= 0x0000;       // sets GPIO Muxs as I/Os
    var2= 0x00FF;       // sets GPIO 15-8 DIR as inputs, 7-0 DIR as outputs
    var3= 0x0000;       // Don't set any input qualifier
    
    Gpio_select();    
    
    test_count = 0;
    Test_status[Test_var] = 0x0002;
    Test_var++;
    
    Test_status[Test_var] = 0xD0BE;      // Set the default value of status 
                                         // to "PASSED"
        
    while (test_count < 4) {             // repeat the tests 4 times
    
    GpioDataRegs.GPACLEAR.all = 0x00FF;  // Test Clear
    asm(" RPT #5 ||NOP");                         
    Test_flag = GpioDataRegs.GPADAT.all;
    
    if ( Test_flag != 0x0000 ) error(1);
    
    GpioDataRegs.GPASET.all = 0x00AA;    // Test Set
    asm(" RPT #5 ||NOP");                         
    Test_flag = GpioDataRegs.GPADAT.all;
    
    if ( Test_flag != 0xAAAA ) error(1);
    
    GpioDataRegs.GPATOGGLE.all = 0x0055; // Test Toggle 
    asm(" RPT #5 ||NOP");
    Test_flag = GpioDataRegs.GPADAT.all;
    
    if ( Test_flag != 0xFFFF ) error(1);
    
    test_count++;
    
    }
    
    Test_var++;
    
// End of Test #2

// GPIO Test #3: 
// Configure Upper 8 bits of Port as outputs and lower 8 bits as inputs    
// Loop back bits [15:8] to bits [7:0]
// Set input qualifier to 0x0001
 
    var1= 0x0000;        // sets GPIO Muxs as I/Os
    var2= 0xFF00;        // sets GPIO 15-8 DIR as outputs, 7-0 as inputs.
    var3= 0x0001;        // Set input qualifier to 1
        
    Gpio_select();
    
// Test #3A: Set delay so that the input gets rejected.