【新人求助】28335使用SCI通信的问题-第2页回答 - 平头弟

TI

【新人求助】28335使用SCI通信的问题

2019-08-03 21:17发布

站内问答 / TI MCU

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使用control suite提供的28335例程v133 scia_loopback时，观察寄存器发现SCIA、SCIB、SCIC三个都在不断更新。运行一定时间后，程序暂停，弹出defaultlsr.c窗口。
这个例程理论上应该只有一个SCI在使用才对啊，而且这个暂停弹出窗口在其他SCI通信的程序中也会出现。
怎么解决？
怎么解释？
附上使用的control suite例程如下：

//###########################################################################
//
// 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: 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 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.
//===========================================================================

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16条回答

1楼-- · 2019-08-04 16:14

NWPU_CHEN 发表于 2014-7-17 08:53
仿真器能给开发板供电？？？？

我用的这个可以。另外一块28335在仿真的时候就不用再接电源，直接仿真器供电就足够仿真（但是烧录flash不行），但是我手上的这一块28335就必须接电源才可以正常仿真

2楼-- · 2019-08-04 21:34

raydead 发表于 2014-7-17 09:52
我用的这个可以。另外一块28335在仿真的时候就不用再接电源，直接仿真器供电就足够仿真（但是烧录flash不 ...

用的哪个公司的仿真器

3楼-- · 2019-08-05 03:16

NWPU_CHEN 发表于 2014-7-17 10:57
用的哪个公司的仿真器

自制的= =b，所以有很多不正规操作。
老师帮我们做的28027开发板，上面集成的仿真器，同时这个仿真器也可以外接别的开发板来使用。
是XDS100V1

4楼-- · 2019-08-05 08:28

精彩回答 2 元偷偷看……

5楼-- · 2019-08-05 08:59

NWPU_CHEN 发表于 2014-7-17 13:06
哦，怪不得呢

嗯嗯

6楼-- · 2019-08-05 11:19

确实是供电问题，要要用2A的才可以，我有一次为了好看，用三星手机充电器做了一个供电电源，700mA，只运行一个CPLD还算正常，如果dsp+cpld同时运行，dsp就会跑飞的。。。我改用2A的电源供电就正常了

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