DSP 28335 SCI 使用TI官方例程回环测试的时候只验证发送的时候，发现发送延迟二个值？我是个新人，求大神们指点一二！万分感谢
//###########################################################################
//
// FILE: Example_2823xSci_Echoback.c
//
// TITLE: DSP2823x Device SCI Echoback.
//
// ASSUMPTIONS:
//
// This program requires the DSP2823x header files.
// As supplied, this project is configured for "boot to SARAM" operation.
//
// Connect the SCI-A port to a PC via a transciever and cable.
// The PC application 'hypterterminal' can be used to view the data
// from the SCI and to send information to the SCI. Characters recieved
// by the SCI port are sent back to the host.
//
// As supplied, this project is configured for "boot to SARAM"
// operation. The 2823x 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 recieves and echo-backs data through the SCI-A port.
//
// 1) Configure hyperterminal:
// Use the included hyperterminal configuration file SCI_96.ht.
// To load this configuration in hyperterminal: file->open
// and then select the SCI_96.ht file.
// 2) Check the COM port.
// The configuration file is currently setup for COM1.
// If this is not correct, disconnect Call->Disconnect
// Open the File-Properties dialog and select the correct COM port.
// 3) Connect hyperterminal Call->Call
// and then start the 2823x SCI echoback program execution.
// 4) The program will print out a greeting and then ask you to
// enter a character which it will echo back to hyperterminal.
//
// As is, the program configures SCI-A for 9600 baud with
// SYSCLKOUT = 150MHz and LSPCLK = 37.5 MHz
// SYSCLKOUT = 100MHz and LSPCLK = 25.0 Mhz
//
//
// Watch Variables:
// LoopCount for the number of characters sent
// ErrorCount
//
//
//###########################################################################
// $TI Release: 2833x/2823x Header Files and Peripheral Examples V133 $
// $Release Date: June 8, 2012 $
//###########################################################################
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
// Prototype statements for functions found within this file.
void scib_echoback_init(void);
void scib_fifo_init(void);
void scib_xmit(int a);
void scib_msg(char *msg);
// Global counts used in this example
Uint16 LoopCount;
Uint16 ErrorCount;
void main(void)
{
Uint16 ReceivedChar;
char *msg;
int i;
// 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 init the pins for the SCI-A port.
// This function is found in the DSP2833x_Sci.c file.
InitScibGpio();
// 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
// Step 5. User specific code:
LoopCount = 0;
ErrorCount = 0;
scib_fifo_init(); // Initialize the SCI FIFO
scib_echoback_init(); // Initalize SCI for echoback
// msg = "\r\n\n\nHello World!\0";
// scib_msg(msg);
// msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";
// scib_msg(msg);
for(;;)
{
/* msg = "\r\nEnter a character: \0";
scib_msg(msg);
// Wait for inc character
while(ScibRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for XRDY =1 for empty state
// Get character
ReceivedChar = ScibRegs.SCIRXBUF.all;
// Echo character back
msg = " You sent: \0";
scib_msg(msg);
scib_xmit(ReceivedChar);
*/
for(i=0;i<100;i++)
{
scib_xmit(i);
}
LoopCount++;
}
}
// Test 1,scib DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
void scib_echoback_init()
{
// Note: Clocks were turned on to the scib peripheral
// in the InitSysCtrl() function
ScibRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol
ScibRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
ScibRegs.SCICTL2.all =0x0003;
ScibRegs.SCICTL2.bit.TXINTENA =1;
ScibRegs.SCICTL2.bit.RXBKINTENA =1;
#if (CPU_FRQ_150MHZ)
ScibRegs.SCIHBAUD =0x0001; // 9600 baud @LSPCLK = 37.5MHz.
ScibRegs.SCILBAUD =0x00E7;
#endif
#if (CPU_FRQ_100MHZ)
ScibRegs.SCIHBAUD =0x0001; // 9600 baud @LSPCLK = 20MHz.
ScibRegs.SCILBAUD =0x0044;
#endif
ScibRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
}
// Transmit a character from the SCI
void scib_xmit(int a)
{
while (ScibRegs.SCIFFTX.bit.TXFFST != 0) {}
ScibRegs.SCITXBUF=a;
}
void scib_msg(char * msg)
{
int i;
i = 0;
while(msg[i] != '\0')
{
scib_xmit(msg[i]);
i++;
}
}
// Initalize the SCI FIFO
void scib_fifo_init()
{
ScibRegs.SCIFFTX.all=0xE040;
ScibRegs.SCIFFRX.all=0x204f;
ScibRegs.SCIFFCT.all=0x0;
}
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