218 lines
7.1 KiB
C
218 lines
7.1 KiB
C
|
// TI File $Revision: /main/11 $
|
||
|
|
// Checkin $Date: May 12, 2008 14:24:12 $
|
||
|
|
//###########################################################################
|
||
|
|
//
|
||
|
|
// FILE: Example_2833xSci_FFDLB.c
|
||
|
|
//
|
||
|
|
// TITLE: DSP2833x Device SCI FIFO Digital Loop Back Test.
|
||
|
|
//
|
||
|
|
// ASSUMPTIONS:
|
||
|
|
//
|
||
|
|
// This program requires the DSP2833x header files.
|
||
|
|
//
|
||
|
|
// This program uses the internal loop back test mode of the peripheral.
|
||
|
|
// Other then boot mode pin configuration, no other hardware configuration
|
||
|
|
// is required.
|
||
|
|
//
|
||
|
|
// 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 test uses the loopback test mode of the SCI module to send
|
||
|
|
// characters starting with 0x00 through 0xFF. The test will send
|
||
|
|
// a character and then check the receive buffer for a correct match.
|
||
|
|
//
|
||
|
|
// Watch Variables:
|
||
|
|
// LoopCount Number of characters sent
|
||
|
|
// ErrorCount Number of errors detected
|
||
|
|
// SendChar Character sent
|
||
|
|
// ReceivedChar Character recieved
|
||
|
|
//
|
||
|
|
//
|
||
|
|
//###########################################################################
|
||
|
|
//
|
||
|
|
// 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
|
||
|
|
|
||
|
|
// Prototype statements for functions found within this file.
|
||
|
|
void scia_loopback_init(void);
|
||
|
|
void scia_fifo_init(void);
|
||
|
|
void scia_xmit(int a);
|
||
|
|
void error();
|
||
|
|
interrupt void scia_rx_isr(void);
|
||
|
|
interrupt void scia_tx_isr(void);
|
||
|
|
|
||
|
|
// Global counts used in this example
|
||
|
|
Uint16 LoopCount;
|
||
|
|
Uint16 ErrorCount;
|
||
|
|
|
||
|
|
void main(void)
|
||
|
|
{
|
||
|
|
Uint16 SendChar;
|
||
|
|
Uint16 ReceivedChar;
|
||
|
|
|
||
|
|
// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
|
||
|
|
// This function is found in the DSP2833x_SysCtrl.c file.
|
||
|
|
InitSysCtrl();
|
||
|
|
|
||
|
|
// Step 2. Select GPIO for the device or for the specific application:
|
||
|
|
// This function is found in the DSP2833x_Gpio.c file.
|
||
|
|
// InitGpio(); skip this as this is example selects the I/O
|
||
|
|
// for SCI-A in this file itself
|
||
|
|
InitSciGpio();
|
||
|
|
|
||
|
|
// 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 DSP2833x_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 DSP2833x_PieCtrl.c file.
|
||
|
|
// InitPieCtrl(); PIE is not used for this example
|
||
|
|
|
||
|
|
// Initialize the PIE Vector Table To a Known State:
|
||
|
|
// This function is found in DSP2833x_PieVect.c.
|
||
|
|
// This function populates the PIE vector table with pointers
|
||
|
|
// to the shell ISR functions found in DSP2833x_DefaultIsr.c.
|
||
|
|
InitPieVectTable();
|
||
|
|
|
||
|
|
// Enable CPU and PIE interrupts
|
||
|
|
// This example function is found in the DSP2833x_PieCtrl.c file.
|
||
|
|
EnableInterrupts();
|
||
|
|
|
||
|
|
// Step 4. Initialize all the Device Peripherals to a known state:
|
||
|
|
// This function is found in DSP2833x_InitPeripherals.c
|
||
|
|
// InitPeripherals(); skip this for SCI tests
|
||
|
|
|
||
|
|
// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:
|
||
|
|
|
||
|
|
LoopCount = 0;
|
||
|
|
ErrorCount = 0;
|
||
|
|
|
||
|
|
scia_fifo_init(); // Initialize the SCI FIFO
|
||
|
|
scia_loopback_init(); // Initalize SCI for digital loop back
|
||
|
|
|
||
|
|
// Note: Autobaud lock is not required for this example
|
||
|
|
|
||
|
|
// Send a character starting with 0
|
||
|
|
SendChar = 0;
|
||
|
|
|
||
|
|
// Step 6. Send Characters forever starting with 0x00 and going through
|
||
|
|
// 0xFF. After sending each, check the recieve buffer for the correct value
|
||
|
|
|
||
|
|
for(;;)
|
||
|
|
{
|
||
|
|
scia_xmit(SendChar);
|
||
|
|
while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for RRDY/RXFFST =1 for 1 data available in FIFO
|
||
|
|
|
||
|
|
// Check received character
|
||
|
|
ReceivedChar = SciaRegs.SCIRXBUF.all;
|
||
|
|
if(ReceivedChar != SendChar) error();
|
||
|
|
|
||
|
|
// Move to the next character and repeat the test
|
||
|
|
SendChar++;
|
||
|
|
// Limit the character to 8-bits
|
||
|
|
SendChar &= 0x00FF;
|
||
|
|
LoopCount++;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:
|
||
|
|
|
||
|
|
void error()
|
||
|
|
{
|
||
|
|
|
||
|
|
ErrorCount++;
|
||
|
|
// asm(" ESTOP0"); // Uncomment to stop the test here
|
||
|
|
// for (;;);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// Test 1,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
|
||
|
|
void scia_loopback_init()
|
||
|
|
{
|
||
|
|
// Note: Clocks were turned on to the SCIA peripheral
|
||
|
|
// in the InitSysCtrl() function
|
||
|
|
|
||
|
|
SciaRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
|
||
|
|
// No parity,8 char bits,
|
||
|
|
// async mode, idle-line protocol
|
||
|
|
SciaRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
|
||
|
|
// Disable RX ERR, SLEEP, TXWAKE
|
||
|
|
SciaRegs.SCICTL2.all =0x0003;
|
||
|
|
SciaRegs.SCICTL2.bit.TXINTENA =1;
|
||
|
|
SciaRegs.SCICTL2.bit.RXBKINTENA =1;
|
||
|
|
SciaRegs.SCIHBAUD =0x0000;
|
||
|
|
SciaRegs.SCILBAUD =0x000F;
|
||
|
|
SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
|
||
|
|
SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
|
||
|
|
}
|
||
|
|
|
||
|
|
// Transmit a character from the SCI'
|
||
|
|
void scia_xmit(int a)
|
||
|
|
{
|
||
|
|
SciaRegs.SCITXBUF=a;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Initalize the SCI FIFO
|
||
|
|
void scia_fifo_init()
|
||
|
|
{
|
||
|
|
SciaRegs.SCIFFTX.all=0xE040;
|
||
|
|
SciaRegs.SCIFFRX.all=0x204f;
|
||
|
|
SciaRegs.SCIFFCT.all=0x0;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//===========================================================================
|
||
|
|
// No more.
|
||
|
|
//===========================================================================
|
||
|
|
|
||
|
|
|
||
|
|
|