394 lines
10 KiB
C
394 lines
10 KiB
C
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//###########################################################################
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//
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// FILE: Example_2833xMcBSP_DLB.c
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//
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// TITLE: McBSP Digital Loop Back Example
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//
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//! \addtogroup f2833x_example_list
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//! <h1>McBSP Digital Loop Back (mcbsp_loopback)</h1>
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//!
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//! This example performs digital loopback tests for the McBSP peripheral.
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//! This example does not use interrupts. Instead, a polling
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//! method is used to check the receive data. The incoming
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//! data is checked for accuracy. If an error is found the error()
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//! function is called and execution stops.
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//!
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//! \b Watch \b Variables \n
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//! - sdata1
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//! - sdata2
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//! - rdata1
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//! - rdata2
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//! - rdata1_point
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//! - rdata2_point
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//
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//###########################################################################
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// $TI Release: $
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// $Release Date: $
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// $Copyright:
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// Copyright (C) 2009-2023 Texas Instruments Incorporated - http://www.ti.com/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// $
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//###########################################################################
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//
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// Included Files
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//
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#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
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//
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// Defines
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//
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//
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// Choose a word size. Uncomment one of the following lines
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//
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#define WORD_SIZE 8 // Run a loopback test in 8-bit mode
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//#define WORD_SIZE 16 // Run a loopback test in 16-bit mode
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//#define WORD_SIZE 32 // Run a loopback test in 32-bit mode
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//
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// Function Prototypes
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//
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void mcbsp_init_dlb(void);
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void mcbsp_xmit(int a, int b);
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void error(void);
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//
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// Globals
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//
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Uint16 sdata1 = 0x000; // Sent Data
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Uint16 rdata1 = 0x000; // Received Data
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Uint16 sdata2 = 0x000; // Sent Data
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Uint16 rdata2 = 0x000; // Received Data
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Uint16 rdata1_point;
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Uint16 rdata2_point;
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Uint16 data_size;
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//
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// Main
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//
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void main(void)
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{
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//
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// Step 1. Initialize System Control:
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// PLL, WatchDog, enable Peripheral Clocks
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// This example function is found in the DSP2833x_SysCtrl.c file.
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//
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InitSysCtrl();
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//
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// Step 2. Initialize GPIO:
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// This example function is found in the DSP2833x_Gpio.c file and
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// illustrates how to set the GPIO to it's default state.
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//
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// InitGpio(); // Skipped for this example
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// For this example, only enable the GPIO for McBSP-A
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InitMcbspaGpio();
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//
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// Step 3. Clear all interrupts and initialize PIE vector table
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//
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//
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// Disable CPU interrupts
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//
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DINT;
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//
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// Initialize PIE control registers to their default state.
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// The default state is all PIE interrupts disabled and flags
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// are cleared.
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// This function is found in the DSP2833x_PieCtrl.c file.
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//
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InitPieCtrl();
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//
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// Disable CPU interrupts and clear all CPU interrupt flags
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//
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IER = 0x0000;
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IFR = 0x0000;
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//
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// Initialize the PIE vector table with pointers to the shell Interrupt
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// Service Routines (ISR).
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// This will populate the entire table, even if the interrupt
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// is not used in this example. This is useful for debug purposes.
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// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
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// This function is found in DSP2833x_PieVect.c.
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//
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InitPieVectTable();
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//
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// Step 4. Initialize all the Device Peripherals:
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// This function is found in DSP2833x_InitPeripherals.c
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//
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// InitPeripherals(); // Not required for this example
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data_size = WORD_SIZE;
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//
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// Initialize and release peripheral (McBSP) from Reset.
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//
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mcbsp_init_dlb();
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//
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// Step 5. User specific code, enable interrupts
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//
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//
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// Run a loopback test in 8-bit mode
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//
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if(data_size == 8)
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{
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sdata2 = 0x0000; // value is a don't care for 8-bit mode
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sdata1 = 0x0000; // 8-bit value to send
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rdata2_point = 0x0000; // value is a don't care for 8-bit mode
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rdata1_point = sdata1;
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for(;;)
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{
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mcbsp_xmit(sdata1,sdata2);
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sdata1++;
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sdata1 = sdata1 & 0x00FF; // Keep it to 8-bits
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//
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// Check for receive
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//
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while(McbspaRegs.SPCR1.bit.RRDY == 0 )
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{
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}
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rdata1 = McbspaRegs.DRR1.all; // read DRR1
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if(rdata1 != rdata1_point)
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{
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error();
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}
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rdata1_point++;
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rdata1_point = rdata1_point & 0x00FF; // Keep it to 8-bits
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//
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// Good place for a breakpoint
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// Check: rdatax_point = sdatax
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// rdata1 = sdata1 - 1
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//
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__asm(" nop");
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}
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}
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//
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// Run a loopback test in 16-bit mode
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//
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else if(data_size == 16)
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{
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sdata2 = 0x0000; // value is a don't care for 16-bit mode
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sdata1 = 0x0000; // 16-bit value to send
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rdata2_point = 0x0000; // value is a don't care for 16-bit mode
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rdata1_point = sdata1;
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for(;;)
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{
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mcbsp_xmit(sdata1,sdata2);
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sdata1++;
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//
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// Check for receive
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//
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while(McbspaRegs.SPCR1.bit.RRDY == 0 )
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{
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}
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rdata1 = McbspaRegs.DRR1.all; // read DRR1
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if(rdata1 != rdata1_point)
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{
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error();
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}
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rdata1_point++;
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//
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// Good place for a breakpoint
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// Check: rdatax_point = sdatax
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// rdata1 = sdata1 - 1
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//
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__asm(" nop");
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}
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}
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//
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// Run a loopback test in 16-bit mode
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//
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else if(data_size == 32)
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{
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sdata1 = 0x0000;
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sdata2 = 0xFFFF;
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rdata1_point = sdata1;
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rdata2_point = sdata2;
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for(;;)
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{
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mcbsp_xmit(sdata1,sdata2);
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sdata1++;
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sdata2--;
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//
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// Check for receive
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//
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while(McbspaRegs.SPCR1.bit.RRDY == 0 )
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{
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}
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rdata2 = McbspaRegs.DRR2.all;
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rdata1 = McbspaRegs.DRR1.all;
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if(rdata1 != rdata1_point)
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{
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error();
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}
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if(rdata2 != rdata2_point)
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{
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error();
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}
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rdata1_point++;
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rdata2_point--;
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//
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// Good place for a breakpoint
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// Check: rdatax_point = sdatax
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// rdata1 = sdata1 - 1
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// rdata2 = sdata2 + 1
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//
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__asm(" nop");
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}
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}
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}
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//
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// error -
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//
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void error(void)
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{
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__asm(" ESTOP0"); // test failed!! Stop!
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for (;;);
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}
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//
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// mcbsp_init_dlb -
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//
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void
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mcbsp_init_dlb()
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{
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//
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// Reset FS generator, sample rate generator & transmitter
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//
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McbspaRegs.SPCR2.all=0x0000;
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McbspaRegs.SPCR1.all=0x0000; // Reset Receiver, Right justify word
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//
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// Enable loopback mode for test. Comment out for normal McBSP
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// transfer mode.
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//
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McbspaRegs.SPCR1.bit.DLB = 1;
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McbspaRegs.MFFINT.all=0x0; // Disable all interrupts
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//
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// Single-phase frame, 1 word/frame, No companding (Receive)
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//
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McbspaRegs.RCR2.all=0x0;
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McbspaRegs.RCR1.all=0x0;
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//
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// Single-phase frame, 1 word/frame, No companding (Transmit)
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//
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McbspaRegs.XCR2.all=0x0;
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McbspaRegs.XCR1.all=0x0;
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//
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// FSX generated internally, FSR derived from an external source
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//
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McbspaRegs.PCR.bit.FSXM = 1;
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//
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// CLKX generated internally, CLKR derived from an external source
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//
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McbspaRegs.PCR.bit.CLKXM = 1;
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//
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// CLKSM=1 (If SCLKME=0, i/p clock to SRG is LSPCLK)
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//
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McbspaRegs.SRGR2.bit.CLKSM = 1;
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McbspaRegs.SRGR2.bit.FPER = 31; // FPER = 32 CLKG periods
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McbspaRegs.SRGR1.bit.FWID = 0; // Frame Width = 1 CLKG period
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McbspaRegs.SRGR1.bit.CLKGDV = 1; // CLKG frequency = LSPCLK/(CLKGDV+1)
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delay_loop(); // Wait at least 2 SRG clock cycles
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//
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// Initialize McBSP Data Length
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//
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if(data_size == 8) // Run a loopback test in 8-bit mode
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{
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InitMcbspa8bit();
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}
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if(data_size == 16) // Run a loopback test in 16-bit mode
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{
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InitMcbspa16bit();
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}
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if(data_size == 32) // Run a loopback test in 32-bit mode
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{
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InitMcbspa32bit();
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}
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McbspaRegs.SPCR2.bit.GRST=1; // Enable the sample rate generator
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delay_loop();
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McbspaRegs.SPCR2.bit.XRST=1; // Release TX from Reset
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McbspaRegs.SPCR1.bit.RRST=1; // Release RX from Reset
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McbspaRegs.SPCR2.bit.FRST=1; // Frame Sync Generator reset
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}
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//
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// mcbsp_xmit -
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//
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void
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mcbsp_xmit(int a, int b)
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{
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McbspaRegs.DXR2.all=b;
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McbspaRegs.DXR1.all=a;
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}
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//
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// End of File
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//
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