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DSP实验报告+心得体会

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实 验 报 告

07电本(1)班

学号

2007050344 姓

名 杨宝辉

同组人

独立

实验日期

2010-5-18

室温

大气压

成 绩

基础实验

一、实验目的

二、实验设备

三、实验原理 浮点数的表达和计算是进行数字信号处理的基本知识;产生正弦信号是数字信号处理1.一台装有CCS软件的计算机; 2.DSP实验箱的TMS320F2812主控板; 3.DSP硬件仿真器。 1.掌握CCS实验环境的使用;

2.掌握用C语言编写DSP程序的方法。

中经常用到的运算;C语言是现代数字信号处理表达的基础语言和通用语言。写实现程序时需要注意两点:(1)浮点数的范围及存储格式;(2)DSP的C语言与ANSI C语言的区别。

四、实验步骤

1.打开CCS 并熟悉其界面;

2.在CCS环境中打开本实验的工程(Example_base.pjt),编译并重建 .out 输出文件,然后通过仿真器把执行代码下载到DSP芯片中;

3. 把X0 , Y0 和Z0添加到Watch窗口中作为观察对象(选中变量名,单击鼠标右键,在弹出菜单中选择“Add Watch Window”命令);

4. 选择view->graph->time/frequency… 。 设置对话框中的参数: 其中“Start Addre”设为“sin_value”,“Acquisition buffer size”和“Display Data size”都设为“100”,并且把“DSP Data Type”设为“32-bit floating point”,

设置好后观察信号序列的波形(sin函数,如图);

5. 单击运行;

6. 观察三个变量从初始化到运算结束整个过程中的变化;观察正弦波形从初始化到运算结束整个过程中的变化;

7. 修改输入序列的长度或初始值,重复上述过程。

五、实验心得体会

通过本次实验,加深了我对DSP的认识,使我对DSP实验的操作有了更进一步的理解。基本掌握了CCS实验环境的使用,并能够使用C语言进行简单的DSP程序设计。 从软件的安装到使用软件进行程序设计与仿真,锻炼了自己的动手能力,也遇到了不少的坎坷,例如芯片的选择,不能因为麻烦而省略该步骤,否则将会运行出错。

附录实验程序: #include \"math.h\" #include \"stdio.h\" #define N 100 #define pi 3.14159

float sin_value[100]; float X0,Y0,Z0;

void main(void) {

int i;

for(i=0;i

sin_value[i]=0;

X0=0.5;

/* 0.100 0000 0000 0000 */

Y0=0.5;

/* 0.100 0000 0000 0000 */

Z0=X0*Y0;

/* 00.01 0000 0000 0000 0000 0000 0000 0000 */

for(i=0;i

sin_value[i]=100*(sin(2*pi*i/N)); }

实 验 报 告

07电本(1)班

学号

2007050344姓

名 杨宝辉 同组人

独立

实验日期

2010-5-20

室温

大气压

成 绩

数码管控制实验

一、实验目的 1.2.3.熟悉2812的指令系统; 熟悉74HC573的使用方法。 熟悉DSP的IO操作使用方法。

二、实验设备

1.一台装有CCS2000软件的计算机;

2.插上2812主控板的DSP实验箱; 3.DSP硬件仿真器。

三、实验原理 此模块由数码管和四个锁存器组成 。数码管为共阴极型的。数据由2812模块的低八位输入,锁存器的控制信号由2812模块输出,但经由CPLD模块译码后再控制对应的八个

四、实验步骤 1.把2812模块小板插到大板上;

2.在CCS2000环境中打开本实验的工程编译Example_7segled.prj,生成输出文件,通过仿真器把执行代码下载到DSP芯片;

3.运行程序;数码管会显示1~8的数字。

4.参考源代码自行修改程序改变显示样式。

五、实验心得体会

通过本次实验中,基本掌握了2812的指令系统的特点,并能够了解并熟悉74HC573的使用方法,进一步加深了对DSP的认识。同时,通过实验操作DSP的IO操作使用方法,对于DSP的IO操作可以熟悉的运用,学到更多的知识。

程序见附录:

#include \"include/DSP281x_Device.h\"

// DSP281x Headerfile Include File #include \"include/DSP281x_Examples.h\"

// DSP281x Examples Include File // Prototype statements for functions found within this file.void delay_loop(void); void Gpio_select(void); // Global variable for this example short codetab[17]= {0x4020,0x6cc0,0x5800,0x4840,0x6440,0xC040,0xC000,0x4cc0, 0x4000,0x4040,0x4400,0xE000,0xD080,0xE800,0xD000,0xD400,0xffff}; main() {

short i;

// Step 1.Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP281x_SysCtrl.c file.

InitSysCtrl();

// Specific clock setting for this example:

EALLOW;

EDIS; // Step 2.Initalize GPIO:

// This example function is found in the DSP281x_Gpio.c file and // illustrates how to set the GPIO to it\'s default state.// InitGpio(); // Skipped for this example // For this example use the following configuration:

Gpio_select(); // Step 3.Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts

DINT; // Initialize the 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 DSP281x_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 DSP281x_DefaultIsr.c.// This function is found in DSP281x_PieVect.c.

InitPieVectTable(); // Step 4.Initialize all the Device Peripherals: // This function is found in DSP281x_InitPeripherals.c // InitPeripherals(); // Not required for this example

InitXintf(); // For this example, init the Xintf // Step 5.User specific code, enable interrupts:

GpioDataRegs.GPADAT.all=0;

Reg01=0x00;

GpioDataRegs.GPADAT.all=0;

Reg02=0x00;

GpioDataRegs.GPADAT.all=0;

Reg03=0x00;

GpioDataRegs.GPADAT.all=0;

Reg04=0x00;

while(1)

{

for(i=0;i

{

GpioDataRegs.GPADAT.all

Reg01=0x00;

delay_loop();

}

for(i=0;i

{

GpioDataRegs.GPADAT.all

Reg02=0x00;

delay_loop();

}

for(i=0;i

{

GpioDataRegs.GPADAT.all

Reg03=0x00;

delay_loop();

}

for(i=0;i

{

GpioDataRegs.GPADAT.all

Reg04=0x00;

delay_loop();

}

} }

void delay_loop() {

=~codetab[i]; =~codetab[i]; =~codetab[i]; =~codetab[i];

short

i,j;

for (i = 0; i

{for (j = 0; j

void Gpio_select(void) {

Uint16 var1;

Uint16 var2;

Uint16 var3;

var1= 0x0000;

var2= 0xFFFF;

var3= 0x0000;

EALLOW; GpioMuxRegs.GPAMUX.all=var1;

// sets GPIO Muxs as I/Os

// sets GPIO DIR as outputs

// sets the Input qualifier values

GpioMuxRegs.GPBMUX.all=var1;

GpioMuxRegs.GPDMUX.all=var1;

GpioMuxRegs.GPFMUX.all=var1;

GpioMuxRegs.GPEMUX.all=var1;

GpioMuxRegs.GPGMUX.all=var1;

GpioMuxRegs.GPADIR.all=var2;

// GPIO PORTs as output

// GPIO DIR select GPIOs as output

GpioMuxRegs.GPBDIR.all=var2;

GpioMuxRegs.GPDDIR.all=var2;

GpioMuxRegs.GPEDIR.all=var2;

GpioMuxRegs.GPFDIR.all=var2;

GpioMuxRegs.GPGDIR.all=var2;

GpioMuxRegs.GPAQUAL.all=var3;

GpioMuxRegs.GPBQUAL.all=var3;

GpioMuxRegs.GPDQUAL.all=var3;

GpioMuxRegs.GPEQUAL.all=var3;

EDIS; } // No more.

// Set GPIO input qualifier values 龙

实 验 报 告

07电本(1)班

学号

2007050344 姓

名 杨宝辉

同组人

独立

实验日期

2010-5-25

室温

大气压

成 绩

交通灯控制实验

一、实验目的

1.熟悉2812的指令系统; 2.熟悉74HC573的使用方法。 3.熟悉DSP的IO操作使用方法。

二、实验设备

1.一台装有CCS2000软件的计算机;

2.插上2812主控板的DSP实验箱; 3.DSP硬件仿真器。

三、实验原理

此模块由发光二极管和一个锁存器组成。

数据由2812模块的低八位输入,锁存器的控制信号由2812模块输出,但经由CPLD模块译码后再控制锁存器。

四、实验步骤

1.把2812模块小板插到大板上;

2.在CCS2000环境中打开本实验的工程编译Example_croled.prj,生成输出文件,通过仿真器把执行代码下载到DSP芯片; 3.运行程序,发光二极管按交通灯方式点亮熄灭。

4.参考源代码,自行修改程序,实现不同的交通灯控制方式。

五、实验心得体会

通过次实验中,使我掌握了 2812的指令系统和74HC573的使用方法。同时,使我掌握了DSP的IO操作使用方法。

实验程序见附录: 附录:

#include \"include/DSP281x_Device.h\"

// DSP281x Headerfile Include File #include \"include/DSP281x_Examples.h\"

// DSP281x Examples Include File // Prototype statements for functions found within this file.void delay_loop(void); void Gpio_select(void); // Global variable for this example main() { // Step 1.Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP281x_SysCtrl.c file.

InitSysCtrl();

// Specific clock setting for this example:

EALLOW;

EDIS; // Step 2.Initalize GPIO:

// This example function is found in the DSP281x_Gpio.c file and // illustrates how to set the GPIO to it\'s default state.// InitGpio(); // Skipped for this example

// For this example use the following configuration:

Gpio_select();

// Step 3.Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts

DINT; // Initialize the 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 DSP281x_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 DSP281x_DefaultIsr.c.// This function is found in DSP281x_PieVect.c.

InitPieVectTable(); // Step 4.Initialize all the Device Peripherals: // This function is found in DSP281x_InitPeripherals.c // InitPeripherals(); // Not required for this example

InitXintf(); // For this example, init the Xintf // Step 5.User specific code, enable interrupts:

while(1)

{

GpioDataRegs.GPADAT.all

=0xdc80;

Reg00=0x00;

delay_loop();

GpioDataRegs.GPADAT.all

=0xec40;

Reg00=0x00;

delay_loop();

GpioDataRegs.GPADAT.all

=0xf0c0;

Reg00=0x00;

delay_loop();

GpioDataRegs.GPADAT.all

=0xec40;

Reg00=0x00;

delay_loop();

} }

void delay_loop() {

short

i,j;

for (i = 0; i

{for (j = 0; j

Uint16 var1;

Uint16 var2;

Uint16 var3;

var1= 0x0000;

var2= 0xFFFF;

var3= 0x0000;

EALLOW; GpioMuxRegs.GPAMUX.all=var1;

// sets GPIO Muxs as I/Os // sets GPIO DIR as outputs // sets the Input qualifier values

GpioMuxRegs.GPBMUX.all=var1;

GpioMuxRegs.GPDMUX.all=var1;

GpioMuxRegs.GPFMUX.all=var1;

GpioMuxRegs.GPEMUX.all=var1;

GpioMuxRegs.GPGMUX.all=var1;

GpioMuxRegs.GPADIR.all=var2; // GPIO PORTs as output

// GPIO DIR select GPIOs as output

GpioMuxRegs.GPBDIR.all=var2;

GpioMuxRegs.GPDDIR.all=var2;

GpioMuxRegs.GPEDIR.all=var2;

GpioMuxRegs.GPFDIR.all=var2;

GpioMuxRegs.GPGDIR.all=var2;

GpioMuxRegs.GPAQUAL.all=var3;

GpioMuxRegs.GPBQUAL.all=var3;

GpioMuxRegs.GPDQUAL.all=var3;

GpioMuxRegs.GPEQUAL.all=var3;

EDIS;

}

// Set GPIO input qualifier values //============================= // No more.//=============================

实 验 报 告

07电本(1)班

学号

2007050344 姓

名 杨宝辉

同组人

独立

实验日期

2010-05-27

室温

大气压

成 绩

步进电机控制实验

一、实验目的 1.2.

二、实验设备

1.一台装有CCS软件的计算机; 2.DSP实验箱(插上电机模块);

3.DSP硬件仿真器; 4.示波器。

三、实验原理

步进电机工作原理,给步进脉冲电机就转,不给脉冲电机就不转,步进脉冲的频率越高,步进控制电机就转的越快;改变各相的通电方式可以改变电机的运行方式;改变通电顺序可以控制步进电机的运行方式;改变通电顺序可以控制步进电机的正反转。

步进电机的控制问题可以总结为两点: 1.产生工作方式需要的时序脉冲;

2.控制步进电机的速度使它始终遵循加速-匀速-减速的规律工作。 掌握2812通用IO口的使用方法; 掌握2812对步进电机的控制。

对于I/O口有二类寄存器:

1.控制寄存器和数据方向寄存器,使用方法如下:首先确定引脚的功能,即IO控制器寄存器,为1表示引脚功能是原模块的功能,否则为IO功能。

2.如果引脚被配置为IO功能,就需要确定它的方向:输入还是输出,。为1表示是输出引脚,否则是输入引脚。对于IO功能的输入或输出是通过读写相应的数据方向寄存器来实现。输入引脚对应读操作;输出引脚对应写操作。

四、实验步骤

1.连接好DSP开发系统;

2.本实验工程文件(Example_stepmotor.pjt),编译,下载程序到DSP; 运行程序,用观察步进电机运行方向和速度的变化;

五、实验心得体会

通过本次实验对于2812通用的IO口进一步熟悉实验,使我基本掌握了2812通用的IO口的使用方法,加深了对IO口的认识。本次实验的主要目的是通过2812对步进机的的控制,开始对于程序的设计没有头绪,通过查阅步进机控制的原理,结合有关资料才正式设计出程序,基本掌握了2812对步进机的控制,也更加熟悉了对DSP程序的设计,受益匪浅。

程序:

#include \"include/DSP281x_Device.h\"

// DSP281x Headerfile Include File #include \"include/DSP281x_Examples.h\"

// DSP281x Examples Include File // Prototype statements for functions found within this file.void delay_loop(void); void Gpio_select(void); // Global variable for this example short codetab[17]= {0x0001,0x0002,0x0004,0x0008,0x0008,0x0004,0x0002,0x0001, 0x0001,0x0002,0x0004,0x0008,0x0001,0x0002,0x0004,0x0008,0x0000}; main() {

short i,j; // Step 1.Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP281x_SysCtrl.c file.

InitSysCtrl(); // Specific clock setting for this example:

EALLOW;

EDIS; // Step 2.Initalize GPIO:

// This example function is found in the DSP281x_Gpio.c file and // illustrates how to set the GPIO to it\'s default state.// InitGpio(); // Skipped for this example // For this example use the following configuration:

Gpio_select(); // Step 3.Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts

DINT; // Initialize the 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 DSP281x_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 DSP281x_DefaultIsr.c.// This function is found in DSP281x_PieVect.c.

InitPieVectTable(); // Step 4.Initialize all the Device Peripherals: // This function is found in DSP281x_InitPeripherals.c // InitPeripherals(); // Not required for this example

InitXintf(); // For this example, init the Xintf // Step 5.User specific code, enable interrupts:

GpioDataRegs.GPADAT.all=0;

Reg06=0x00;

while(1)

{

for(j=0;j

{

for(i=0;i

{

GpioDataRegs.GPADAT.all

Reg06=0x00;

delay_loop();

}

}

for(j=0;j

{

for(i=4;i

{

GpioDataRegs.GPADAT.all

Reg06=0x00;

delay_loop();

}

}

} } void delay_loop() {

short

i,j;

for (i = 0; i

{for (j = 0; j

Uint16 var1;

Uint16 var2;

=codetab[i]; =codetab[i];

Uint16 var3;

var1= 0x0000;

var2= 0xFFFF;

var3= 0x0000;

EALLOW; GpioMuxRegs.GPAMUX.all=var1;

// sets GPIO Muxs as I/Os

// sets GPIO DIR as outputs

// sets the Input qualifier values

GpioMuxRegs.GPBMUX.all=var1;

GpioMuxRegs.GPDMUX.all=var1;

GpioMuxRegs.GPFMUX.all=var1;

GpioMuxRegs.GPEMUX.all=var1;

GpioMuxRegs.GPGMUX.all=var1; GpioMuxRegs.GPADIR.all=var2;

// GPIO PORTs as output

// GPIO DIR select GPIOs as output

GpioMuxRegs.GPBDIR.all=var2;

GpioMuxRegs.GPDDIR.all=var2;

GpioMuxRegs.GPEDIR.all=var2;

GpioMuxRegs.GPFDIR.all=var2;

GpioMuxRegs.GPGDIR.all=var2;

GpioMuxRegs.GPAQUAL.all=var3;

GpioMuxRegs.GPBQUAL.all=var3;

GpioMuxRegs.GPDQUAL.all=var3;

GpioMuxRegs.GPEQUAL.all=var3;

EDIS;

}

// Set GPIO input qualifier values //============================= // No more.//=============================

实 验 报 告

07电本(1)班

学号

2007050344 姓

名 杨宝辉

同组人 独立

实验日期

2010-6-1

室温

大气压

成 绩

直流电机控制实验

一、实验目的 1.2.

二、实验设备 1.一台装有CCS软件的计算机; 2.DSP实验箱;

要求学生掌握2812 PWM的使用方法; 掌握2812对直流电机的控制。

3.DSP硬件仿真器; 4.示波器。

三、实验原理

电机模块的原理图如下

四、实验步骤

3.连接好DSP开发系统;

4.本实验工程文件(Example_dcmotor.pjt),编译,下载程序到DSP; 5.运行程序,用观察直流电机运行方向和速度的变化;

五、实验心得体会

通过本次实验,认识了PWM的使用方法,通过亲身体验,初步掌握了2812对PWM的控制使用方法,加深了对PWM的认识。本次实验的主要目的是通过2812对直流电机的控制,开始对于程序的设计没有头绪,通过查阅直流电机的原理,结合有关资料才正式设计出程序,基本掌握了2812对直流电机的控制,也更加熟悉了对DSP程序的设计,受益匪浅。

附:实验程序:

#include \"include/DSP281x_Device.h\"

// DSP281x Headerfile Include File #include \"include/DSP281x_Examples.h\"

// DSP281x Examples Include File // Prototype statements for functions found within this file.void init_eva(void); void init_evb(void); void delay_loop(); // Global variable for this example main()

{ unsigned short i; // Step 1.Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP281x_SysCtrl.c file.

InitSysCtrl(); // Specific clock setting for this example:

EALLOW;

EDIS; // Step 2.Initalize GPIO:

// This example function is found in the DSP281x_Gpio.c file and // illustrates how to set the GPIO to it\'s default state.// InitGpio(); // Skipped for this example // Initialize only GPAMUX and GPBMUX for this test

EALLOW;

// Enable PWM pins

GpioMuxRegs.GPAMUX.all = 0x00FF; // EVA PWM 1-6 pins

GpioMuxRegs.GPBMUX.all = 0x00FF; // EVB PWM 7-12 pins

EDIS; // Step 3.Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts

DINT; // Initialize the 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 DSP281x_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 DSP281x_DefaultIsr.c.// This function is found in DSP281x_PieVect.c.

InitPieVectTable(); // Step 4.Initialize all the Device Peripherals: // This function is found in DSP281x_InitPeripherals.c // InitPeripherals(); // Not required for this example

InitXintf(); // For this example, init the Xintf // Step 5.User specific code, enable interrupts:

init_eva();

//init_evb();

while(1)

{

for(i=0;i

{

Reg06=0;

EvbRegs.CMPR6 = i;

delay_loop();

}

} } void delay_loop() {

short

i,j;

for (i = 0; i

{for (j = 0; j

// Initalize EVA Timer1

EvaRegs.T1PR = 0xFFFF;

// Timer1 period

EvaRegs.T1CMPR = 0x3C00;

// Timer1 compare

EvaRegs.T1CNT = 0x0000;

// Timer1 counter

// TMODE = continuous up/down

// Timer enable

// Timer compare enable

EvaRegs.T1CON.all = 0x1042;

// Initalize EVA Timer2

EvaRegs.T2PR = 0x0FFF;

// Timer2 period

EvaRegs.T2CMPR = 0x03C0;

// Timer2 compare

EvaRegs.T2CNT = 0x0000;

// Timer2 counter

// TMODE = continuous up/down

// Timer enable

// Timer compare enable

EvaRegs.T2CON.all = 0x1042;

// Setup T1PWM and T2PWM

// Drive T1/T2 PWM by compare logic

EvaRegs.GPTCONA.bit.TCMPOE = 1;

// Polarity of GP Timer 1 Compare = Active low

EvaRegs.GPTCONA.bit.T1PIN = 1;

// Polarity of GP Timer 2 Compare = Active high

EvaRegs.GPTCONA.bit.T2PIN = 2;

// Enable compare for PWM1-PWM6

//EvaRegs.CMPR1 = 0x0C00;

//EvaRegs.CMPR2 = 0x3C00;

EvaRegs.CMPR3 = 0xFC00;

// Compare action control. Action that takes place

// on a cmpare event

// output pin 1 CMPR1active low

// output pin 3 CMPR2active low

// output pin 5 CMPR3active low

EvaRegs.ACTRA.all = 0x0666;

EvaRegs.DBTCONA.all = 0x0000; // Disable deadband

EvaRegs.COMCONA.all = 0xA600; }

void init_evb() { // EVB Configure T3PWM, T4PWM and PWM7-PWM12 // Step 1active high

// output pin 2 CMPR4active high

// output pin 4 CMPR5active high

// output pin 6 CMPR6x000 0000 0011 0000

EDIS; // 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 DSP281x_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 DSP281x_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 DSP281x_PieVect.c.

// This function populates the PIE vector table with pointers

// to the shell ISR functions found in DSP281x_DefaultIsr.c.

InitPieVectTable();

// Enable CPU and PIE interrupts

// This example function is found in the DSP281x_PieCtrl.c file.

EnableInterrupts(); // Step 4.Initialize all the Device Peripherals to a known state:

// This function is found in DSP281x_InitPeripherals.c

// InitPeripherals(); skip this for SCI tests

// Step 5.User specific functions, Reaign 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.RXFIFST !=1) { } // wait for XRDY =1 for empty state

// Check received character

ReceivedChar = SciaRegs.SCIRXBUF.all;

if(ReceivedChar != SendChar) error(1);

// Move to the next character and repeat the test

SendChar++;

// Limit the character to 8-bits

SendChar &= 0x00FF;

LoopCount++;

if(LoopCount==256)

{

LoopCount=0;

SciaRegs.SCICCR.bit.LOOPBKENA =0; // Disable loop back

SciaRegs.SCICTL1.all =0x0023;

// Relinquish SCI from Reset while((ReceivedChar = SciaRegs.SCIRXBUF.all)!=0x0d); scia_loopback_init(); // Initalize SCI for digital loop back

}

} }

// Step 7.Insert all local Interrupt Service Routines (ISRs) and functions here: void error(int ErrorFlag) {

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

=0x0001;

SciaRegs.SCILBAUD

=0x00e7;

} // Transmit a character from the SCI\' void scia_xmit(int a) {

SciaRegs.SCITXBUF=a; }

// Initalize the SCI FIFO void scia_fifo_init()

SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back

SciaRegs.SCICTL1.all =0x0023;

// Relinquish SCI from Reset

{

SciaRegs.SCIFFTX.all=0xE040;

SciaRegs.SCIFFRX.all=0x204f;

SciaRegs.SCIFFCT.all=0x0; }

//============================= // No more.//=============================

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