mcbsp_loopback.rar_TMS320F28335

//########################################################################### // // FILE: Example_2833xMCBSP_FFDLB.c // // TITLE: DSP2833x Device McBSP Digital Loop Back program. // // ASSUMPTIONS: // // This program requires the DSP2833x header files. // 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: // // Digital loopback tests for the McBSP peripheral. // // Three different serial word sizes can be tested. // // Before compiling this project: // * Select the serial word size (8/16/32) by using // the #define statements at the beginning of the code. // // // This example does not use interrupts. Instead, a polling // method is used to check the receive data. The incoming // data is checked for accuracy. If an error is found the error() // function is called and execution stops. // // This program will execute until terminated by the user. // // Watch Variables: // sdata1 // sdata2 // rdata1 // rdata2 // rdata1_point // rdata2_point // //########################################################################### // // Original Author: S.S. // // $TI Release: DSP2833x/DSP2823x Header Files V1.20 $ // $Release Date: August 1, 2008 $ //########################################################################### #include "DSP28x_Project.h" // Device Headerfile and Examples Include File // Choose a word size. Uncomment one of the following lines #define WORD_SIZE 8 // Run a loopback test in 8-bit mode //#define WORD_SIZE 16 // Run a loopback test in 16-bit mode //#define WORD_SIZE 32 // Run a loopback test in 32-bit mode // Prototype statements for functions found within this file. void mcbsp_xmit(int a, int b); void error(void); // Global data for this example Uint16 sdata1 = 0x000; // Sent Data Uint16 rdata1 = 0x000; // Recieved Data Uint16 sdata2 = 0x000; // Sent Data Uint16 rdata2 = 0x000; // Recieved Data Uint16 rdata1_point; Uint16 rdata2_point; void main(void) { Uint16 datasize; // 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(); // Skipped for this example // For this example, only enable the GPIO for McBSP-A InitMcbspaGpio(); // 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(); // Step 4. Initialize all the Device Peripherals: // This function is found in DSP2833x_InitPeripherals.c // InitPeripherals(); // Not required for this example datasize = WORD_SIZE; InitMcbspa(); // Initalize the Mcbsp-A in loopback test mode // Step 5. User specific code, enable interrupts: if(datasize == 8) // Run a loopback test in 8-bit mode { InitMcbspa8bit(); sdata2 = 0x0000; // value is a don't care for 8-bit mode sdata1 = 0x0000; // 8-bit value to send rdata2_point = 0x0000; // value is a don't care for 8-bit mode rdata1_point = sdata1; for(;;) { mcbsp_xmit(sdata1,sdata2); sdata1++; sdata1 = sdata1 & 0x00FF; // Keep it to 8-bits while(McbspaRegs.SPCR1.bit.RRDY == 0 ) { } // Check for receive rdata1 = McbspaRegs.DRR1.all; // read DRR1 if(rdata1 != rdata1_point) error(); rdata1_point++; rdata1_point = rdata1_point & 0x00FF; // Keep it to 8-bits asm(" nop"); // Good place for a breakpoint // Check: rdatax_point = sdatax // rdata1 = sdata1 - 1 } } else if(datasize == 16) // Run a loopback test in 16-bit mode { InitMcbspa16bit(); sdata2 = 0x0000; // value is a don't care for 16-bit mode sdata1 = 0x0000; // 16-bit value to send rdata2_point = 0x0000; // value is a don't care for 16-bit mode rdata1_point = sdata1; for(;;) { mcbsp_xmit(sdata1,sdata2); sdata1++; while(McbspaRegs.SPCR1.bit.RRDY == 0 ) { } // Check for receive rdata1 = McbspaRegs.DRR1.all; // read DRR1 if(rdata1 != rdata1_point) error(); rdata1_point++; asm(" nop"); // Good place for a breakpoint // Check: rdatax_point = sdatax // rdata1 = sdata1 - 1 } } else if(datasize == 32) // Run a loopback test in 16-bit mode { InitMcbspa32bit(); sdata1 = 0x0000; sdata2 = 0xFFFF; rdata1_point = sdata1; rdata2_point = sdata2; for(;;) { mcbsp_xmit(sdata1,sdata2); sdata1++; sdata2--; while(McbspaRegs.SPCR1.bit.