DSP最小系统设计报告(共9页)

1、精选优质文档-倾情为你奉上DSP最小系统报告一 TMS320F2812最小系统1.1 TMS320F2812最小系统 TMS320F2812的最小系统如图1-1所示。电路主要由TMS320F2812芯片、30MHz有源晶振和电路电源以及电容、电阻电感等少量器件构成。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脚的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，都能够正常运行。一般来说，在设计电源的而过程中，模拟地和数字地最后通过电感连接起来，电源和地通过电容连接起来。图1-1 TMS320F2812最小系统1.2 电源电路的设计 TMS320X2812工

2、作时所要求的电压分为两部分：3.3V的Flash电压和1.8V的内核电压。TMS320X2812对电源很敏感，所以在此推荐选择电压精度比较高的电源芯片TPS767D301或者TPS767D318。TPS767D301芯片的输入电压为+5V，芯片起振，正常工作之后，能够产生3.3V和1.8V的两种电压供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芯片能够自身产生复位信号，此复位信号可直接供DSP芯片使用，所以不用为DSP设置专门的复位芯片。复位芯片与DSP芯片的连接如上电路图。而对于JTAG电路，在实际设计过程中，需要考虑到JTAG下载口的抗干扰

3、性，在与DSP相连接的端口需要采用上拉设计，JTAG电路如下图所示。图1-3-1 JTAG下载口电路图1-3-2 复位电路二外设电路 我设计的流水灯电路使用了GPIOA0到GPIOA4的五个端口，其中GPIOA0到GPIOA4的5个IO口输出连接LED的5个灯。最后的实验结果：5个LED灯被循环点亮。 图2-1 LED流水灯 3 程序3.1 CMD文件MEMORYPAGE 0 : PRAMH0 : origin = 0x3f8000, length = 0x PAGE 1 : /* SARAM */ RAMM0 : origin = 0x, length = 0x RAMM1 : origin

4、 = 0x, length = 0x /* Peripheral Frame 0: */ DEV_EMU : origin = 0x, length = 0x FLASH_REGS : origin = 0x000A80, length = 0x CSM : origin = 0x000AE0, length = 0x XINTF : origin = 0x000B20, length = 0x CPU_TIMER0 : origin = 0x000C00, length = 0x CPU_TIMER1 : origin = 0x000C08, length = 0x CPU_TIMER2 :

5、 origin = 0x000C10, length = 0x PIE_CTRL : origin = 0x000CE0, length = 0x PIE_VECT : origin = 0x000D00, length = 0x /* Peripheral Frame 1: */ ECAN_A : origin = 0x, length = 0x ECAN_AMBOX : origin = 0x, length = 0x /* Peripheral Frame 2: */ SYSTEM : origin = 0x, length = 0x SPI_A : origin = 0x, lengt

6、h = 0x SCI_A : origin = 0x, length = 0x XINTRUPT : origin = 0x, length = 0x GPIOMUX : origin = 0x0070C0, length = 0x GPIODAT : origin = 0x0070E0, length = 0x ADC : origin = 0x, length = 0x EV_A : origin = 0x, length = 0x EV_B : origin = 0x, length = 0x SPI_B : origin = 0x, length = 0x SCI_B : origin

7、 = 0x, length = 0x MCBSP_A : origin = 0x, length = 0x /* CSM Password Locations */ CSM_PWL : origin = 0x3F7FF8, length = 0x /* SARAM */ DRAMH0 : origin = 0x3f9000, length = 0x SECTIONS /* Allocate program areas: */ .reset : > PRAMH0, PAGE = 0 .text : > PRAMH0, PAGE = 0 .cinit : > PRAMH0, PA

8、GE = 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_E

9、MU, 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

10、 = 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

11、, 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,

12、PAGE = 1 McbspaRegsFile : > MCBSP_A, PAGE = 1 /* CSM Password Locations */ CsmPwlFile : > CSM_PWL, PAGE = 13.2 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; SysCtr

13、lRegs.WDCR = 0x0068; /禁止看门狗模块 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/#/ FI

14、LE:DSP28_Gpio.c/ TITLE:DSP28 General Purpose I/O Initialization & Support Functions./#/ Ver | dd mmm yyyy | Who | Description of changes/ =|=|=|=/ 0.55| 06 May 2002 | L.H. | EzDSP Alpha Release/ 0.56| 20 May 2002 | L.H. | No change/ 0.57| 27 May 2002 | L.H. | No change/#include "DSP28_Devic

15、e.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; GpioMux

16、Regs.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; /禁止CPU中断 IFR=O

17、x0000; /清除CPU中断标志 InitPieCtrl(); /初始化PIE控制寄存器 InitPieVectTable(); /初始化PIE中断向量表 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_lo

18、op(); /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