msp430g2553学习笔记

DCO_init();

write_dac(0xff);

for(;;) {

write_dac(0xff);

delay_ms(1);

write_dac(0xc0);

delay_ms(1);

write_dac(0x7f);

delay_ms(1);

write_dac(0x3f);

delay_ms(1);

write_dac(0x00);

delay_ms(1); } }

2，0832还可以用如波形发生，原理是想0832送入不同的code，会根据上面公式输入不同的电压，这样控制不同的输入code和方式的话，就可以得到不同的电压波形输出，我写了一个程序如下：

#include

#include \

//dac0832 pin define 0832工作于单缓冲模式，输入寄存器受控，DAC寄存器直通

#define CS_SET P2OUT |= BIT6

#define CS_CLR P2OUT &= ~BIT6 //P26 CS

#define WR_SET P2OUT |= BIT7

#define WR_CLR P2OUT &= ~BIT7 //P27 WR

#define DI P1OUT //DI

uint key=0; //按下的按键编号

uchar s_step[]= {\ \

uchar s_sin[] = {\ \

uchar s_square[]= {\ \

uchar s_saw[]= {\ \

uchar s_triangular[]={\

const uchar sin_a[256]={0x80,0x83,0x86,0x89,0x8c,0x8f,0x92,0x95,0x98,0x9c, //产生正弦波的数组

0x9f,0xa2,0xa5,0xa8,0xab,0xae,0xb0,0xb3,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,0xc7,

0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,0xda,0xdc,0xde,0xe0,0xe2,0xe4,0xe6,0xe8,0xea,

0xec,0xed,0xef,0xf0,0xf2,0xf3,0xf4,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfc,0xfd,

0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfe,0xfd,

0xfc,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf3,0xf2,0xf0,0xef,0xed,0xec,0xea,

0xe8,0xe6,0xe4,0xe3,0xe1,0xde,0xdc,0xda,0xd8,0xd6,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,

0xc4,0xc1,0xbf,0xbc,0xb9,0xb6,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,

0x96,0x92,0x8f,0x8c,0x89,0x86,0x83,0x80,0x7d,0x79,0x76,0x73,0x70,0x6d,0x6a,0x67,

0x64,0x61,0x5e,0x5b,0x58,0x55,0x52,0x4f,0x4c,0x49,0x46,0x43,0x41,0x3e,0x3b,0x39,

0x36,0x33,0x31,0x2e,0x2c,0x2a,0x27,0x25,0x23,0x21,0x1f,0x1d,0x1b,0x19,0x17,0x15,0x14,

0x12,0x10,0xf,0xd,0xc,0xb,0x9,0x8,0x7,0x6,0x5,0x4,0x3,0x3,0x2,0x1,0x1,0x0,0x0,0x0,0x0,

0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x1,0x2,0x3,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xc,0xd,

0xe,0x10,0x12,0x13,0x15,0x17,0x18,0x1a,0x1c,0x1e,0x20,0x23,0x25,0x27,0x29,0x2c,0x2e,

0x30,0x33,0x35,0x38,0x3b,0x3d,0x40,0x43,0x46,0x48,0x4b,0x4e,0x51,0x54,0x57,0x5a,0x5d,

0x60,0x63,0x66,0x69,0x6c,0x6f,0x73,0x76,0x79,0x7c};

void IO_interrupt_init() //IO中断初始化函数 {

P2REN |= BIT0+BIT1+BIT2+BIT5; // pullup 内部上拉电阻使能

//使用中断时，使能内部的上拉电阻这样当该脚悬空是，电平不会跳变，防止悬空时电平跳变不停的触发中断

P2OUT = BIT0+BIT1+BIT2+BIT5; // 当引脚上的上拉或下拉电阻使能时，PxOUT选择是上拉还是下来

//0：下拉，1：上拉

P2IE |= BIT0+BIT1+BIT2+BIT5; // interrupt enabled P13中断使能

P2IES |= BIT0+BIT1+BIT2+BIT5; // Hi/lo edge 下降沿中断

//P1IES &= ~BIT3; //上升沿触发中断

P2IFG &= ~(BIT0+BIT1+BIT2+BIT5); //中断标志位清零 }

void write_dac(uchar data) //dac写数据函数 {

CS_CLR;

DI = data;

WR_CLR;

delay_us(1);

WR_SET; //latch data

CS_SET; }

void saw() //锯齿波产生函数 {

uchar i=0;

for(i=0;i<255;i++) //0~255 {

write_dac(i); } }

void triangular() //产生三角波的函数 {

uchar i=0;