实验六AD转换实验.doc

;*;* 北京达盛科技有限公司;* 研 发 部;*;* ;*;*- 文件信息6 - ;*;* 文件名称 : 7822_54.C;* 文件功能 : 该文件为测试ad7822的测试程序,CPU=TMS320VC5402;* 接口说明： -扩展到IO空间，8002H，READ ONLY; -下面是AD 采样时钟的控制，通过拨码开关SW2的控制 ： ; 1-ON、2-ON、3-ON、4-ON：ADCLK=250KHZ ; -最小的CONVST的脉冲时间20NS; -每次转换的时间最大420NS，也就是说CONVST的下降沿开始开始后的420NS; -就可以通过读端口得到转换的数据; -转换结束的信号EOC 的最大宽度110NS ; -用中断方式，5402工作在最大频率30MHZEOC的宽度能满足INT中断宽度的要求*/-头文件-/#include MMRegs.h#include DspRegDefine.h /VC5402 寄存器定义/-/* * 宏定义 */#define UCHAR unsigned char#define UINT16 unsigned int#define UINT32 unsigned long#define TRUE 1#define FALSE 0#define LEN 256/-/-/* 端口定义 */-ioport UINT16 port8002; /定义输出AD端口为0x8002;/-/* 全局变量定义 */-UINT16 data_buffLEN ; /数据缓冲 256个数组UINT16 i = 0; /* * 所使用的函数原型 */void cpu_init(void); /初始化CPUvoid Delay(UINT16 numbers); /延迟void xint2_init(void); /外部中断2初始化子程序interrupt void ExtInt2(); /中断2中断子程序/-/* 函数定义 */-/ 函数名称 : void cpu_init(void)/ 函数说明 : 初始化CPU/ 输入参数 : 无/ 输出参数 : 无/-void cpu_init(void)asm( nop );asm( nop );asm( nop );/-/CLKMD DEFINITIONS:/ PLLMUL (bit 15-12) - 0000 PLL multiplier = 0 (mult by 1)/ PLLDIV (bit 11) - 0 PLL divider = 0 (div by 1)/ PLLCOUNT (bit 10-3)- 11111111 PLL counter set to max/ PLLONOFF (bit 2) - 1 PLL on/ PLLNDIV (bit 1) - 1 Select PLL mode/ PLLSTATUS (bit 1) - x PLL Status (read only)/ -/ 0000011111111111 = 0x07ff CLKMD=1 X CLKIN/- *(unsigned int*)CLKMD=0x0; /switch to DIV mode clkout= 1/2 clkin while(*(unsigned int*)CLKMD)&01)!=0); *(unsigned int*)CLKMD=0x77ff; /switch to PLL X 3 mode /-/ ST0 DEFINITIONS:/ ARP (bit 15-13) - 000 Auxiliary register pointer/ TC (bit 12) - 1 Test/control flag/ C (bit 11) - 1 Carry is set to 1 if the result of an addition generates a carry; it is cleared to 0 if the/ result of a subtraction generates a borrow./ OVA (bit 10) - 0 Overflow flag for accumulator A/ OVB (bit 9) - 0 Overflow flag for accumulator B/ DP (bit 8-0) - 00000000 Data-memory page pointer/ -/ 0001 1000 0000 0000 =0x1800 Reset value/-/ *(unsigned int*)ST0=0x1800; /-/ ST1 DEFINITIONS:/ BRAF (bit 15) - 0 Block-repeat active flag / CPL (bit 14) - 1 Compiler mode CPL=0 DP;CPL=1 SP/ XF (bit 13) - 1 XF status/ HM (bit 12) - 0 Hold mode/ INTM (bit 11) - 1 Interrupt mode INTM=0,All unmasked interrupts are enabled/ Reser (bit 10) - 0 Always read as 0/ OVM (bit 9) - 0 Overflow mode/ SXM (bit 8) - 1 Sign-extension mode/ C16 (bit 7) - 0 Dual 16-Bit/double-precision arithmetic mode/ FRCT (bit 6) - 0 Fractional mode/ CMPT (bit 5) - 0 Compatibility mode/ ASM (bit 4-0) - 00000 Accumulator shift mode/ -/ 0110 1001 0000 0000 =0x2900 Reset value/-/ *(unsigned int*)ST1=0x6900;/- /IPTR DEFINITIONS?/ IPTR (bit 15-7) - 001111111 Run-time Interrupt vector location = 0x3f80 (for now)/ MP/MC (bit 6) - 1 Turn off internal Instruction ROM (use RAM)/ OVLY (bit 5) - 1 Turn on internal RAM/ AVIS (bit 4) - 1 Address visibility on/ DROM (bit 3) - 0 Data ROM of FF00FFFF is external / CLKOFF (bit 2) - 0 Clockout enabled,only for use clkout=cpu clock/ SMUL (bit 1) - 1 Saturate before multiply on MAC/ SST (bit 0) - 0 Do not saturate before store/ -/ 0011 1111 1111 0010 = 0x3ff2/*-*/*(unsigned int*)PMST=0x3FF2;/-/ SWWSR DEFINITIONS?/ XPA (bit 15) - 0 Extended program address control bit. XPA is used in conjunction with the program space fields/ (bits 0 through 5) to select the address range for program space wait states/ I/O (bits 14-12) - 111 set to max wait states for seven/ Data1 (bits 11-9) - 111 Seven Wait state for Upper data space(0x8000-0xFFFF) / Data2 (bits 8-6) - 111 Seven Wait states for Lower data space (0x0000 - 0x7FFF)/ Prog1 (bits 5-3) - 111 Seven Wait state for Upper program space. (xx8000-xxFFFF)/ Prog2 (bits 2-0) - 111 Seven Wait states for Program space. (xx0000-xx7FFF)/ -/ 1 111 111 111 111 111 - 0x7fff/*-*/*(unsigned int*)SWWSR=0x7fff;/-/SWCR DEFINITIONS?/ Reserved (bits 15-1)/ SWSM (bit 0) - 1 wait-state base values are mulitplied by 2/ for a maximum of 14 wait states./ -/ 0000 0000 0000 0001/-*(unsigned int*)SWCR=0x0001;/-/BSCR DEFINITIONS?/ BNKCMP (bit 15-12) - 1111 Bank compare. Determines the external memory-bank size. BNKCMP is used to mask the four MSBs of/ an address./ 1111 4k/ 1110 8k/ 1100 16k/ 1000 32k/ 0000 64k/ PS-DS (bit 11) - 1 One extra cycle is inserted between consecutive data and program reads. / Reserved (bits 10-3) - 00000000/ HBH (bit 2) - 0 The hpi bus holder is disabled/ BH (bit 1) - 0 The data bus holder is disabled/ EXIO (bit 0) - 0 The external bus interface functions as usual/ -/ 1111 1000 0000 0000/- *(unsigned int*)BSCR=0xf800;/-asm( ssbx intm ); /Disable all mask interrupts /-/ IMR DEFINITIONS/ Writing a 1 to any IMR bit position enables the corresponding interrupt (when INTM = 0)/ Reserved (bits 15-14) - xx/ DMAC5 (bit 13) - 0 DMA channel 5 interrupt mask bit / DMAC4 (bit 12) - 0 DMA channel 4 interrupt mask bit/ BXINT1/DMAC3 (bit 11) - 0 McBSP1 transmit interrupt mask bit, or the DMA channel 3 / BRINT1/DMAC2 (bit 10) - 0 McBSP1 receive interrupt mask bit, or the DMA channel 2/ HPINT (bit 9) - 0 Host to 54x interrup /mask/ INT3 (bit 8) - 0 External interrupt 3 mask/ TINT1/DMAC1 (bit 7) - 0 timer1 interrupt mask bit, or the DMA channel 1 interrupt mask bit / DMAC0 (bit 6) - 0 reserved, or the DMA channel 0 interrupt mask bit/ BXINT0 (bit 5) - 0 McBSP0 transmit interrupt mask bit/ BRINT0 (bit 4) - 0 McBSP0 receive interrupt mask bit/ TINT0 (bit 3) - 0 Timer 0 interrupt mask bit/ INT2 (bit 2) - 0 External interrupt 2 mask bit/ INT1 (bit 1) - 0 External interrupt 1 mask bit/ INT0 (bit 0) - 0 External interrupt 0 mask bit/ -/ 0000 0000 0000 0000/-*(unsigned int*)IMR=0x0;/-/ IFR DEFINITIONS/ Writing a 1 to any IFR bit position clear the corresponding interrupt mask ,when corresponding interrupt occur IFR corresponding bit=1/ Reserved (bits 15-14) - xx/ DMAC5 (bit 13) - 1 DMA channel 5 interrupt flag bit / DMAC4 (bit 12) - 1 DMA channel 4 interrupt flag bit/ BXINT1/DMAC3 (bit 11) - 1 McBSP1 transmit interrupt flag bit, or the DMA channel 3 / BRINT1/DMAC2 (bit 10) - 1 McBSP1 receive interrupt flag bit, or the DMA channel 2/ HPINT (bit 9) - 1 Host to 54x interrutpflak/ INT3 (bit 8) - 1 External interrupt 3 flag/ TINT1/DMAC1 (bit 7) - 1 timer1 interrupt flag bit, or the DMA channel 1 interrupt mask bit / DMAC0 (bit 6) - 1 reserved, or the DMA channel 0 interrupt flag bit/ BXINT0 (bit 5) - 1 McBSP0 transmit interrupt flag bit/ BRINT0 (bit 4) - 1 McBSP0 receive interrupt flag bit/ TINT0 (bit 3) - 1 Timer 0 interrupt flag bit/ INT2 (bit 2) - 1 External interrupt 2 flag bit/ INT1 (bit 1) - 1 External interrupt 1 flag bit/ INT0 (bit 0) - 1 External interrupt 0 flag bit/ -/ 1111 1111 1111 1111/*-*/*(unsigned int*)IFR=0xffff;/- asm( nop );asm( nop );asm( nop ); /*- 函数名称 : void Delay(int numbers)- 函数说明 : 延时- 输入参数 : numbers- 输出参数 : 无*/void Delay(UINT16 numbers) UINT16 i,j; for(i=0;i4000;i+) for(j=0;jnumbers;j+); /-/ 函数名称 : void xint2_init(void)/ 函数说明 : 初始化XINT2/ 输入参数 : 无/ 输出参数 : 无