DSP最小专业系统设计方案报告.doc

DSP最小系统汇报

一． TMS320F2812最小系统
1.1 TMS320F2812最小系统
TMS320F2812最小系统图1-1所表示。电路关键由TMS320F2812芯片、30MHz有源晶振和电路电源和电容、电阻电感等少许器件组成。另外，考虑到DSP在下载时需要下载端口，所以在最小系统上加一个14脚JTAG仿真烧写口。该最小系统不管是在仿真模式下还是在实时模式下，全部能够正常运行。通常来说，在设计电源而过程中，模拟地和数字地最终经过电感连接起来，电源和地经过电容连接起来。

图1-1 TMS320F2812最小系统

1.2 电源电路设计
TMS320X2812工作时所要求电压分为两部分：3.3VFlash电压和1.8V内核电压。TMS320X2812对电源很敏感，所以在此推荐选择电压精度比较高电源芯片TPS767D301或TPS767D318。TPS767D301芯片输入电压为+5V，芯片起振，正常工作以后，能够产生3.3V和1.8V两种电压供DSP使用。

图1-2 电源电路

1.3 JTAG下载口电路及复位电路

考虑到TPS767D301芯片能够本身产生复位信号，此复位信号可直接供DSP芯片使用，所以不用为DSP设置专门复位芯片。复位芯片和DSP芯片连接如上电路图。而对于JTAG电路，在实际设计过程中，需要考虑到JTAG下载口抗干扰性，在和DSP相连接端口需要采取上拉设计，JTAG电路以下图所表示。

图1-3-1 JTAG下载口电路

图1-3-2 复位电路

二．外设电路
我设计流水灯电路使用了GPIOA0到GPIOA4五个端口，其中GPIOA0到GPIOA45个IO口输出连接LED5个灯。最终试验结果：5个LED灯被循环点亮。

图2-1 LED流水灯

三． 程序
3.1 CMD文件
MEMORY
{
PAGE 0 :
PRAMH0 : origin = 0x3f8000, length = 0x001000

PAGE 1 :
/* SARAM */
RAMM0 : origin = 0x000000, length = 0x000400
RAMM1 : origin = 0x000400, length = 0x000400

/* Peripheral Frame 0: */
DEV_EMU : origin = 0x000880, length = 0x000180
FLASH_REGS : origin = 0x000A80, length = 0x000060
CSM : origin = 0x000AE0, length = 0x000010
XINTF : origin = 0x000B20, length = 0x000020
CPU_TIMER0 : origin = 0x000C00, length = 0x000008
CPU_TIMER1 : origin = 0x000C08, length = 0x000008
CPU_TIMER2 : origin = 0x000C10, length = 0x000008
PIE_CTRL : origin = 0x000CE0, length = 0x000020
PIE_VECT : origin = 0x000D00, length = 0x000100

/* Peripheral Frame 1: */
ECAN_A : origin = 0x006000, length = 0x000100
ECAN_AMBOX : origin = 0x006100, length = 0x000100

/* Peripheral Frame 2: */
SYSTEM : origin = 0x007010, length = 0x000020
SPI_A : origin = 0x007040, length = 0x000010
SCI_A : origin = 0x007050, length = 0x000010
XINTRUPT : origin = 0x007070, length = 0x000010
GPIOMUX : origin = 0x0070C0, length = 0x000020
GPIODAT : origin = 0x0070E0, length = 0x000020
ADC : origin = 0x007100, length = 0x000020
EV_A : origin = 0x007400, length = 0x000040
EV_B : origin = 0x007500, length = 0x000040
SPI_B : origin = 0x007740, length = 0x000010
SCI_B : origin = 0x007750, length = 0x000010
MCBSP_A : origin = 0x007800, length = 0x000040

/* CSM Password Locations */
CSM_PWL : origin = 0x3F7FF8, length = 0x000008

/* SARAM */
DRAMH0 : origin = 0x3f9000, length = 0x001000
}

SECTIONS
{
/* Allocate program areas: */
.reset : > PRAMH0, PAGE = 0
.text : > PRAMH0, PAGE = 0
.cinit : > PRAMH0, PAGE = 0

/* Allocate data areas: */
.stack : > RAMM1, PAGE = 1
.bss : > DRAMH0, PAGE = 1
.ebss : > DRAMH0, PAGE = 1
.const : > DRAMH0, PAGE = 1
.econst : > DRAMH0, PAGE = 1
.sysmem : > DRAMH0, PAGE = 1

/* Allocate Peripheral Frame 0 Register Structures: */
DevEmuRegsFile : > DEV_EMU, PAGE = 1
FlashRegsFile : > FLASH_REGS, PAGE = 1
CsmRegsFile : > CSM, PAGE = 1
XintfRegsFile : > XINTF, PAGE = 1
CpuTimer0RegsFile : > CPU_TIMER0, PAGE = 1
CpuTimer1RegsFile : > CPU_TIMER1, PAGE = 1
CpuTimer2RegsFile : > CPU_TIMER2, PAGE = 1
PieCtrlRegsFile : > PIE_CTRL, PAGE = 1
PieVectTable : > PIE_VECT, PAGE = 1

/* Allocate Peripheral Frame 2 Register Structures: */
ECanaRegsFile : > ECAN_A, PAGE = 1
ECanaMboxesFile : > ECAN_AMBOX PAGE = 1

/* Allocate Peripheral Frame 1 Register Structures: */
SysCtrlRegsFile : > SYSTEM, PAGE = 1
SpiaRegsFile : > SPI_A, PAGE = 1
SciaRegsFile : > SCI_A, PAGE = 1
XIntruptRegsFile : > XINTRUPT, PAGE = 1
GpioMuxRegsFile : > GPIOMUX, PAGE = 1
GpioDataRegsFile : > GPIODAT PAGE = 1
AdcRegsFile : > ADC, PAGE = 1
EvaRegsFile : > EV_A, PAGE = 1
EvbRegsFile : > EV_B, PAGE = 1
ScibRegsFile : > SCI_B, PAGE = 1
McbspaRegsFile : > MCBSP_A, PAGE = 1

/* CSM Password Locations */
CsmPwlFile : > CSM_PWL, PAGE = 1

}

3.2 系统初始化函数
#include "DSP28_Device.h"
//---------------------------------------------------------------------------
// InitSysCtrl:
//---------------------------------------------------------------------------
// This function initializes the System Control registers to a known state.
//
void InitSysCtrl(void)
{
Uint16 i;
EALLOW;
SysCtrlRegs.WDCR = 0x0068; //严禁看门狗模块
SysCtrlRegs.PLLCR = 0xA;

for(i= 0; i< 5000; i++){} //延时，使得PLL模块能够完成初始化操作

//高速时钟预定标器和低速时钟预定标器，产生高速外设时钟HSPCLK和低速外设时钟LSPCLK
SysCtrlRegs.HISPCP.all = 0x0001;
SysCtrlRegs.LOSPCP.all = 0x0002;
EDIS;
}
3.3GPIO初始化函数
//
// TMDX ALPHA RELEASE
// Intended for product evaluation purposes
//
//###########################################################################
//
// FILE: DSP28_Gpio.c
//
// TITLE: DSP28 General Purpose I/O Initialization & Support Functions.
//
//###########################################################################
//
// Ver | dd mmm yyyy | Who | Description of changes
// =====|=============|======|===============================================
// 0.55| 06 May | L.H. | EzDSP Alpha Release
// 0.56| 20 May | L.H. | No change
// 0.57| 27 May | L.H. | No change
//###########################################################################

#include "DSP28_Device.h"
//---------------------------------------------------------------------------
// InitGpio:
//---------------------------------------------------------------------------
// This function initializes the Gpio to a known state.
//
void InitGpio(void)
{
EALLOW;
GpioMuxRegs.GPAMUX.bit.PWM1GPIOA0 = 0;
GpioMuxRegs.GPADIR.bit.GPIOA0 = 1;
GpioMuxRegs.GPAMUX.bit.PWM2GPIOA1 = 0;
GpioMuxRegs.GPADIR.bit.GPIOA1= 1;
GpioMuxRegs.GPAMUX.bit.PWM3GPIOA2= 0;
GpioMuxRegs.GPADIR.bit.GPIOA2= 1;
GpioMuxRegs.GPAMUX.bit.PWM4GPIOA3= 0;
GpioMuxRegs.GPADIR.bit.GPIOA3= 1;
GpioMuxRegs.GPAMUX.bit.PWM5GPIOA4= 0;
GpioMuxRegs.GPADIR.bit.GPIOA4= 1;
EDIS;
}

3.4 主函数
#include "DSP28_Device.h"
void main(void)
{
int kk=0;
InitSysCtrl(); //初始化系统函数
DINT;
IER=Ox0000; //严禁CPU中止
IFR=Ox0000; //清除CPU中止标志
InitPieCtrl(); //初始化PIE控制寄存器
InitPieVectTable(); //初始化PIE中止向量表
InitGpio(); //初始化GPIO口
while(1)
{
GpioDataRegs.GPACLEAR.bit.GPIOA0 = 1; //PWM1引脚输出低电平，LED1灯亮
for(kk=0;kk<100;kk++)
delay_loop(); //延时保持
GpioDataRegs.GPASET.bit.GPIOA0 = 1; //PWM1引脚输出高电平，LED1灯灭

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持

GpioDataRegs.GPACLEAR.bit.GPIOA1 = 1; //PWM2引脚输出低电平，LED2灯亮

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持
GpioDataRegs.GPASET.bit.GPIOA1 = 1; //PWM2引脚输出高电平，LED2灯灭

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持

GpioDataRegs.GPACLEAR.bit.GPIOA2 = 1; //PWM3引脚输出低电平，LED3灯亮

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持
GpioDataRegs.GPASET.bit.GPIOA2 = 1; //PWM3引脚输出高电平，LED3灯灭

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持

GpioDataRegs.GPACLEAR.bit.GPIOA3 = 1; //PWM4引脚输出低电平，LED4灯亮

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持
GpioDataRegs.GPASET.bit.GPIOA3 = 1; //PWM4引脚输出高电平，LED4灯灭

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持

GpioDataRegs.GPACLEAR.bit.GPIOA4 = 1; //PWM5引脚输出低电平，LED5灯亮

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持
GpioDataRegs.GPASET.bit.GPIOA4 = 1; //PWM5引脚输出高电平，LED5灯灭

for(kk=0;kk<100;kk++)
delay_loop(); //延时保持
}
}

void delay_loop()
{
short i;
for(i=0;i<30000;i++){}

}