msp430单片机到底有哪些寄存器,分别干嘛用?
寄存器实在太多了。。我有个文档给你看看吧、、
MSP430寄存器中文注释---P1/2口(带中断功能)
/************************************************************
* DIGITAL I/O Port1/2 寄存器定义 有中断功能
************************************************************/
#define P1IN_ 0x0020 /* P1 输入寄存器 */
const sfrb P1IN = P1IN_;
#define P1OUT_ 0x0021 /* P1 输出寄存器 */
sfrb P1OUT = P1OUT_;
#define P1DIR_ 0x0022 /* P1 方向选择寄存器 */
sfrb P1DIR = P1DIR_;
#define P1IFG_ 0x0023 /* P1 中断标志寄存器*/
sfrb P1IFG = P1IFG_;
#define P1IES_ 0x0024 /* P1 中断边沿选择寄存器*/
sfrb P1IES = P1IES_;
#define P1IE_ 0x0025 /* P1 中断使能寄存器 */
sfrb P1IE = P1IE_;
#define P1SEL_ 0x0026 /* P1 功能选择寄存器*/
sfrb P1SEL = P1SEL_;
#define P2IN_ 0x0028 /* P2 输入寄存器 */
const sfrb P2IN = P2IN_;
#define P2OUT_ 0x0029 /* P2 输出寄存器 */
sfrb P2OUT = P2OUT_;
#define P2DIR_ 0x002A /* P2 方向选择寄存器 */
sfrb P2DIR = P2DIR_;
#define P2IFG_ 0x002B /* P2 中断标志寄存器 */
sfrb P2IFG = P2IFG_;
#define P2IES_ 0x002C /* P2 中断边沿选择寄存器 */
sfrb P2IES = P2IES_;
#define P2IE_ 0x002D /* P2 中断使能寄存器 */
sfrb P2IE = P2IE_;
#define P2SEL_ 0x002E /* P2 功能选择寄存器 */
sfrb P2SEL = P2SEL_;
MSP430寄存器中文注释---P3/4口 (无中断功能)
/************************************************************
* DIGITAL I/O Port3/4寄存器定义 无中断功能
************************************************************/
#define P3IN_ 0x0018 /* P3 输入寄存器 */
const sfrb P3IN = P3IN_;
#define P3OUT_ 0x0019 /* P3 输出寄存器 */
sfrb P3OUT = P3OUT_;
#define P3DIR_ 0x001A /* P3 方向选择寄存器 */
sfrb P3DIR = P3DIR_;
#define P3SEL_ 0x001B /* P3 功能选择寄存器*/
sfrb P3SEL = P3SEL_;
#define P4IN_ 0x001C /* P4 输入寄存器 */
const sfrb P4IN = P4IN_;
#define P4OUT_ 0x001D /* P4 输出寄存器 */
sfrb P4OUT = P4OUT_;
#define P4DIR_ 0x001E /* P4 方向选择寄存器 */
sfrb P4DIR = P4DIR_;
#define P4SEL_ 0x001F /* P4 功能选择寄存器 */
sfrb P4SEL = P4SEL_;
/************************************************************
* DIGITAL I/O Port5/6 I/O口寄存器定义PORT5和6 无中断功能
************************************************************/
#define P5IN_ 0x0030 /* P5 输入寄存器 */
const sfrb P5IN = P5IN_;
#define P5OUT_ 0x0031 /* P5 输出寄存器*/
sfrb P5OUT = P5OUT_;
#define P5DIR_ 0x0032 /* P5 方向选择寄存器*/
sfrb P5DIR = P5DIR_;
#define P5SEL_ 0x0033 /* P5 功能选择寄存器*/
sfrb P5SEL = P5SEL_;
#define P6IN_ 0x0034 /* P6 输入寄存器 */
const sfrb P6IN = P6IN_;
#define P6OUT_ 0x0035 /* P6 输出寄存器*/
sfrb P6OUT = P6OUT_;
#define P6DIR_ 0x0036 /* P6 方向选择寄存器*/
sfrb P6DIR = P6DIR_;
#define P6SEL_ 0x0037 /* P6 功能选择寄存器*/
sfrb P6SEL = P6SEL_;
MSP430寄存器中文注释--- 硬件乘法器
/************************************************************
硬件乘法器的寄存器定义
************************************************************/
#define MPY_ 0x0130 /* 无符号乘法 */
sfrw MPY = MPY_;
#define MPYS_ 0x0132 /* 有符号乘法*/
sfrw MPYS = MPYS_;
#define MAC_ 0x0134 /* 无符号乘加 */
sfrw MAC = MAC_;
#define MACS_ 0x0136 /* 有符号乘加 */
sfrw MACS = MACS_;
#define OP2_ 0x0138 /* 第二乘数 */
sfrw OP2 = OP2_;
#define RESLO_ 0x013A /* 低6位结果寄存器 */
sfrw RESLO = RESLO_;
#define RESHI_ 0x013C /* 高6位结果寄存器 */
sfrw RESHI = RESHI_;
#define SUMEXT_ 0x013E /*结果扩展寄存器 */
const sfrw SUMEXT = SUMEXT_;
MSP430寄存器中文注释---看门狗和定时器
/************************************************************
* 看门狗定时器的寄存器定义
************************************************************/
#define WDTCTL_ 0x0120
sfrw WDTCTL = WDTCTL_;
#define WDTIS0 0x0001 /*选择WDTCNT的四个输出端之一*/
#define WDTIS1 0x0002 /*选择WDTCNT的四个输出端之一*/
#define WDTSSEL 0x0004 /*选择WDTCNT的时钟源*/
#define WDTCNTCL 0x0008 /*清除WDTCNT端: 为1时 从0开始计数*/
#define WDTTMSEL 0x0010 /*选择模式 0: 看门狗模式; 1: 定时器模式*/
#define WDTNMI 0x0020 /*选择NMI/RST 引脚功能 0:为 RST; 1:为NMI*/
#define WDTNMIES 0x0040 /*WDTNMI=1时.选择触发延 0:为上升延 1:为下降延*/
#define WDTHOLD 0x0080 /*停止看门狗定时器工作 0:启动;1:停止*/
#define WDTPW 0x5A00 /* 写密码:高八位*/
/* SMCLK= 1MHz定时器模式 */
#define WDT_MDLY_32 WDTPW+WDTTMSEL+WDTCNTCL /* TSMCLK*2POWER15=32ms 复位状态 */
#define WDT_MDLY_8 WDTPW+WDTTMSEL+WDTCNTCL+WDTIS0 /* TSMCLK*2POWER13=8.192ms " */
#define WDT_MDLY_0_5 WDTPW+WDTTMSEL+WDTCNTCL+WDTIS1 /* TSMCLK*2POWER9=0.512ms " */
#define WDT_MDLY_0_064 WDTPW+WDTTMSEL+WDTCNTCL+WDTIS1+WDTIS0 /* TSMCLK*2POWER6=0.512ms " */
/* ACLK=32.768KHz 定时器模式*/
#define WDT_ADLY_1000 WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL /* TACLK*2POWER15=1000ms " */
#define WDT_ADLY_250 WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL+WDTIS0 /* TACLK*2POWER13=250ms " */
#define WDT_ADLY_16 WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL+WDTIS1 /* TACLK*2POWER9=16ms " */
#define WDT_ADLY_1_9 WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL+WDTIS1+WDTIS0 /* TACLK*2POWER6=1.9ms " */
/* SMCLK=1MHz看门狗模式 */
#define WDT_MRST_32 WDTPW+WDTCNTCL /* TSMCLK*2POWER15=32ms 复位状态 */
#define WDT_MRST_8 WDTPW+WDTCNTCL+WDTIS0 /* TSMCLK*2POWER13=8.192ms " */
#define WDT_MRST_0_5 WDTPW+WDTCNTCL+WDTIS1 /* TSMCLK*2POWER9=0.512ms " */
#define WDT_MRST_0_064 WDTPW+WDTCNTCL+WDTIS1+WDTIS0 /* TSMCLK*2POWER6=0.512ms " */
/* ACLK=32KHz看门狗模式 */
#define WDT_ARST_1000 WDTPW+WDTCNTCL+WDTSSEL /* TACLK*2POWER15=1000ms " */
#define WDT_ARST_250 WDTPW+WDTCNTCL+WDTSSEL+WDTIS0 /* TACLK*2POWER13=250ms " */
#define WDT_ARST_16 WDTPW+WDTCNTCL+WDTSSEL+WDTIS1 /* TACLK*2POWER9=16ms " */
#define WDT_ARST_1_9 WDTPW+WDTCNTCL+WDTSSEL+WDTIS1+WDTIS0 /* TACLK*2POWER6=1.9ms " */
MSP430寄存器中文注释---A/D采样寄存器定义
/************************************************************
* ADC12 A/D采样寄存器定义
************************************************************/
/*ADC12转换控制类寄存器*/
#define ADC12CTL0_ 0x0; /* ADC12 Control 0 */
sfrw ADC12CTL0 = ADC12CTL0_;
#define ADC12CTL1_ 0x01A2 /* ADC12 Control 1 */
sfrw ADC12CTL1 = ADC12CTL1_;
/*ADC12中断控制类寄存器*/
#define ADC12IFG_ 0x01A4 /* ADC12 Interrupt Flag */
sfrw ADC12IFG = ADC12IFG_;
#define ADC12IE_ 0x01A6 /* ADC12 Interrupt Enable */
sfrw ADC12IE = ADC12IE_;
#define ADC12IV_ 0x01A8 /* ADC12 Interrupt Vector Word */
sfrw ADC12IV = ADC12IV_;
/*ADC12存贮器类寄存器*/
#define ADC12MEM_ 0x0140 /* ADC12 Conversion Memory */
#ifndef __IAR_SYSTEMS_ICC
#define ADC12MEM ADC12MEM_ /* ADC12 Conversion Memory (for assembler) */
#else
#define ADC12MEM ((int*) ADC12MEM_) /* ADC12 Conversion Memory (for C) */
#endif
#define ADC12MEM0_ ADC12MEM_ /* ADC12 Conversion Memory 0 */
sfrw ADC12MEM0 = ADC12MEM0_;
#define ADC12MEM1_ 0x0142 /* ADC12 Conversion Memory 1 */
sfrw ADC12MEM1 = ADC12MEM1_;
#define ADC12MEM2_ 0x0144 /* ADC12 Conversion Memory 2 */
sfrw ADC12MEM2 = ADC12MEM2_;
#define ADC12MEM3_ 0x0146 /* ADC12 Conversion Memory 3 */
sfrw ADC12MEM3 = ADC12MEM3_;
#define ADC12MEM4_ 0x0148 /* ADC12 Conversion Memory 4 */
sfrw ADC12MEM4 = ADC12MEM4_;
#define ADC12MEM5_ 0x014A /* ADC12 Conversion Memory 5 */
sfrw ADC12MEM5 = ADC12MEM5_;
#define ADC12MEM6_ 0x014C /* ADC12 Conversion Memory 6 */
sfrw ADC12MEM6 = ADC12MEM6_;
#define ADC12MEM7_ 0x014E /* ADC12 Conversion Memory 7 */
sfrw ADC12MEM7 = ADC12MEM7_;
#define ADC12MEM8_ 0x0150 /* ADC12 Conversion Memory 8 */
sfrw ADC12MEM8 = ADC12MEM8_;
#define ADC12MEM9_ 0x0152 /* ADC12 Conversion Memory 9 */
sfrw ADC12MEM9 = ADC12MEM9_;
#define ADC12MEM10_ 0x0154 /* ADC12 Conversion Memory 10 */
sfrw ADC12MEM10 = ADC12MEM10_;
#define ADC12MEM11_ 0x0156 /* ADC12 Conversion Memory 11 */
sfrw ADC12MEM11 = ADC12MEM11_;
#define ADC12MEM12_ 0x0158 /* ADC12 Conversion Memory 12 */
sfrw ADC12MEM12 = ADC12MEM12_;
#define ADC12MEM13_ 0x015A /* ADC12 Conversion Memory 13 */
sfrw ADC12MEM13 = ADC12MEM13_;
#define ADC12MEM14_ 0x015C /* ADC12 Conversion Memory 14 */
sfrw ADC12MEM14 = ADC12MEM14_;
#define ADC12MEM15_ 0x015E /* ADC12 Conversion Memory 15 */
sfrw ADC12MEM15 = ADC12MEM15_;
/*ADC12存贮控制类寄存器*/
#define ADC12MCTL_ 0x0080 /* ADC12 Memory Control */
#ifndef __IAR_SYSTEMS_ICC
#define ADC12MCTL ADC12MCTL_ /* ADC12 Memory Control (for assembler) */
#else
#define ADC12MCTL ((char*) ADC12MCTL_) /* ADC12 Memory Control (for C) */
#endif
#define ADC12MCTL0_ ADC12MCTL_ /* ADC12 Memory Control 0 */
sfrb ADC12MCTL0 = ADC12MCTL0_;
#define ADC12MCTL1_ 0x0081 /* ADC12 Memory Control 1 */
sfrb ADC12MCTL1 = ADC12MCTL1_;
#define ADC12MCTL2_ 0x0082 /* ADC12 Memory Control 2 */
sfrb ADC12MCTL2 = ADC12MCTL2_;
#define ADC12MCTL3_ 0x0083 /* ADC12 Memory Control 3 */
sfrb ADC12MCTL3 = ADC12MCTL3_;
#define ADC12MCTL4_ 0x0084 /* ADC12 Memory Control 4 */
sfrb ADC12MCTL4 = ADC12MCTL4_;
#define ADC12MCTL5_ 0x0085 /* ADC12 Memory Control 5 */
sfrb ADC12MCTL5 = ADC12MCTL5_;
#define ADC12MCTL6_ 0x0086 /* ADC12 Memory Control 6 */
sfrb ADC12MCTL6 = ADC12MCTL6_;
#define ADC12MCTL7_ 0x0087 /* ADC12 Memory Control 7 */
sfrb ADC12MCTL7 = ADC12MCTL7_;
#define ADC12MCTL8_ 0x0088 /* ADC12 Memory Control 8 */
sfrb ADC12MCTL8 = ADC12MCTL8_;
#define ADC12MCTL9_ 0x0089 /* ADC12 Memory Control 9 */
sfrb ADC12MCTL9 = ADC12MCTL9_;
#define ADC12MCTL10_ 0x008A /* ADC12 Memory Control 10 */
sfrb ADC12MCTL10 = ADC12MCTL10_;
#define ADC12MCTL11_ 0x008B /* ADC12 Memory Control 11 */
sfrb ADC12MCTL11 = ADC12MCTL11_;
#define ADC12MCTL12_ 0x008C /* ADC12 Memory Control 12 */
sfrb ADC12MCTL12 = ADC12MCTL12_;
#define ADC12MCTL13_ 0x008D /* ADC12 Memory Control 13 */
sfrb ADC12MCTL13 = ADC12MCTL13_;
#define ADC12MCTL14_ 0x008E /* ADC12 Memory Control 14 */
sfrb ADC12MCTL14 = ADC12MCTL14_;
#define ADC12MCTL15_ 0x008F /* ADC12 Memory Control 15 */
sfrb ADC12MCTL15 = ADC12MCTL15_;
/* ADC12CTL0 内8位控制寄存器位*/
#define ADC12SC 0x001 /*采样/转换控制位*/
#define ENC 0x002 /* 转换允许位*/
#define ADC12TOVIE 0x004 /*转换时间溢出中断允许位*/
#define ADC12OVIE 0x008 /*溢出中断允许位*/
#define ADC12ON 0x010 /*ADC12内核控制位*/
#define REFON 0x020 /*参考电压控制位*/
#define REF2_5V 0x040 /*内部参考电压的电压值选择位 '0'为1.5V; '1'为2.5V*/
#define MSH 0x080 /*多次采样/转换位*/
#define MSC 0x080 /*多次采样/转换位*/
/*SHT0 采样保持定时器0 控制ADC12的结果存贮器MEM0~MEM7的采样周期*/
#define SHT0_0 0*0x100 /*采样周期=TADC12CLK*4 */
#define SHT0_1 1*0x100 /*采样周期=TADC12CLK*8 */
#define SHT0_2 2*0x100 /*采样周期=TADC12CLK*16 */
#define SHT0_3 3*0x100 /*采样周期=TADC12CLK*32 */
#define SHT0_4 4*0x100 /*采样周期=TADC12CLK*64 */
#define SHT0_5 5*0x100 /*采样周期=TADC12CLK*96 */
#define SHT0_6 6*0x100 /*采样周期=TADC12CLK*128 */
#define SHT0_7 7*0x100 /*采样周期=TADC12CLK*192 */
#define SHT0_8 8*0x100 /*采样周期=TADC12CLK*256 */
#define SHT0_9 9*0x100 /*采样周期=TADC12CLK*384 */
#define SHT0_10 10*0x100 /*采样周期=TADC12CLK*512 */
#define SHT0_11 11*0x100 /*采样周期=TADC12CLK*768 */
#define SHT0_12 12*0x100 /*采样周期=TADC12CLK*1024 */
#define SHT0_13 13*0x100 /*采样周期=TADC12CLK*1024 */
#define SHT0_14 14*0x100 /*采样周期=TADC12CLK*1024 */
#define SHT0_15 15*0x100 /*采样周期=TADC12CLK*1024 */
/*SHT1 采样保持定时器1 控制ADC12的结果存贮器MEM8~MEM15的采样周期*/
#define SHT1_0 0*0x100 /*采样周期=TADC12CLK*4 */
#define SHT1_1 1*0x100 /*采样周期=TADC12CLK*8 */
#define SHT1_2 2*0x100 /*采样周期=TADC12CLK*16 */
#define SHT1_3 3*0x100 /*采样周期=TADC12CLK*32 */
#define SHT1_4 4*0x100 /*采样周期=TADC12CLK*64 */
#define SHT1_5 5*0x100 /*采样周期=TADC12CLK*96 */
#define SHT1_6 6*0x100 /*采样周期=TADC12CLK*128 */
#define SHT1_7 7*0x100 /*采样周期=TADC12CLK*192 */
#define SHT1_8 8*0x100 /*采样周期=TADC12CLK*256 */
#define SHT1_9 9*0x100 /*采样周期=TADC12CLK*384 */
#define SHT1_10 10*0x100 /*采样周期=TADC12CLK*512 */
#define SHT1_11 11*0x100 /*采样周期=TADC12CLK*768 */
#define SHT1_12 12*0x100 /*采样周期=TADC12CLK*1024 */
#define SHT1_13 13*0x100 /*采样周期=TADC12CLK*1024 */
#define SHT1_14 14*0x100 /*采样周期=TADC12CLK*1024 */
#define SHT1_15 15*0x100 /*采样周期=TADC12CLK*1024 */
/* ADC12CTL1 内8位控制寄存器位*/
#define ADC12BUSY 0x0001 /*ADC12忙标志位*/
#define CONSEQ_0 0*2 /*单通道单次转换*/
#define CONSEQ_1 1*2 /*序列通道单次转换*/
#define CONSEQ_2 2*2 /*单通道多次转换*/
#define CONSEQ_3 3*2 /*序列通道多次转换*/
#define ADC12SSEL_0 0*8 /*ADC12内部时钟源*/
#define ADC12SSEL_1 1*8 /*ACLK*/
#define ADC12SSEL_2 2*8 /*MCLK*/
#define ADC12SSEL_3 3*8 /*SCLK*/
#define ADC12DIV_0 0*0x20 /*1分频*/
#define ADC12DIV_1 1*0x20 /*2分频*/
#define ADC12DIV_2 2*0x20 /*3分频*/
#define ADC12DIV_3 3*0x20 /*4分频*/
#define ADC12DIV_4 4*0x20 /*5分频*/
#define ADC12DIV_5 5*0x20 /*6分频*/
#define ADC12DIV_6 6*0x20 /*7分频*/
#define ADC12DIV_7 7*0x20 /*8分频*/
#define ISSH 0x0100 /*采样输入信号反向与否控制位*/
#define SHP 0x0200 /*采样信号(SAMPCON)选择控制位*/
#define SHS_0 0*0x400 /*采样信号输入源选择控制位 ADC12SC*/
#define SHS_1 1*0x400 /*采样信号输入源选择控制位 TIMER_A.OUT1*/
#define SHS_2 %2
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十万火急【msp430单片机的AD转换程序】!!!!!
这个是F247的程序。
#include "msp430x24x.h"
#define Latch_addr_H P5OUT|=0x10
#define Latch_addr_L P5OUT=0xef
#define Latch_data_H P5OUT|=0x20
#define Latch_data_L P5OUT=0xdf
#define uchar unsigned char
void delay(unsigned int i);
void LED_Disp(uchar pos,uchar value);
void init();
void transport();
void ADC12setup(void);
const uchar tab[11]={0x03,0x9f,0x25,0x0d,0x99,0x49,0x41,0x1f,0x01,0x09,0xfe};
uchar shuma[4]={6,7,8,9};
unsigned int shuju;
//主函数
main( void )
{
uchar m;
P5DIR |= 0x30; //定义为输出端口
P4DIR |= 0xff;
P2DIR |=0xff;
P2OUT=0xff;
init();
transport();
delay(2000);
ADC12CTL0 |= ADC12SC; //sampling open,AD转换完成后(ADC12BUSY=0),ADC12SC自动复位;
while((ADC12IFG BIT0) == 0); //等转换结束
shuju = ADC12MEM0; //读转换数据值,同时清ADC12IFG0标志
while(1)
{
//ADC12CTL0 |= ADC12SC; //sampling open,AD转换完成后(ADC12BUSY=0),ADC12SC自动复位;
//while((ADC12IFG BIT0) == 0); //等转换结束
//shuju = ADC12MEM0;
transport();
LED_Disp(m,shuma[m]);
delay(5);
m++;
if(m3)
m=0;
if(m==3)
{
LED_Disp(m,10);
delay(5);
}
}
}
//初始化+采集
void init()
{
WDTCTL = WDTPW + WDTHOLD; // 停止WDT
P1DIR=0x01;P1OUT=0x0f; //LED设置
ADC12setup();
_EINT(); // 全局中断使能
}
//ADC12初始化
void ADC12setup(void)
{
//ADC12设置**************************
P6SEL |= 0x01; //使用A/D通道 A0
ADC12CTL0 = ADC12ON ; //开ADC12内核,设SHT0=2 (N=4)
ADC12CTL1 = SHP ; //SAMPCON信号选为采样定时器输出
//ADC12内部参考电压设置
ADC12CTL0 |= REF2_5V; //选用内部参考电压为2.5V
ADC12CTL0 |= REFON; //内部参考电压打开
ADC12MCTL0 |= SREF_0; //R+=3.3V R-=VSS
//转换允许
ADC12CTL0 |= ENC ; //转换允许(上升沿)
shuju=0x00;
}
//转换
void transport()
{
unsigned int q;
q=(shuju*5)/4;
shuma[0]=q%10;
shuma[1]=(q%100)/10;
shuma[2]=(q%1000)/100;
shuma[3]=q/1000;
}
//显示函数
void LED_Disp(uchar pos,uchar value)
{
P5OUT=0x00;
P4OUT=0x10(pos);
Latch_addr_H;
Latch_addr_L;
if( value=10)
{
P4OUT=tab[value];
Latch_data_H;
Latch_data_L;
}
}
//延时
void delay(unsigned int i)
{ int m,n;
for(m=0;mi;m++)
for(n=0;n120;n++);
}
/*adc中断服务程序
#pragma vector=ADC_VECTOR//ADC 中断服务程序
__interrupt void ADC12ISR (void)
{
static unsigned int index = 0; // 中断服务程序中的静态变量
A0results[index] = ADC12MEM0; //移动A0 结果往数组,此操作的同时清除ADC12FIG.0
A1results[index] = ADC12MEM1; //移动A1 结果往数组,此操作的同时清除ADC12FIG.1
A2results[index] = ADC12MEM2; //移动A2 结果往数组,此操作的同时清除ADC12FIG.2
A3results[index] = ADC12MEM3; //移动A3 结果往数组,此操作的同时清除ADC12FIG.3
index = (index+1)%Num_of_Results; // 增加结果的索引,取index 变量的模(余数)
}
*/
求单片机大神技术帝帮忙!!基于msp430的电子秤问题。lcd显示和称重没问题。但是连接后屏幕数字无变化。
uart_init函数的问题。
UCA0工作于UART模式时,需要设置相应的IO口,并打开IO口的第二功能。
还有一点,建议不要使用20次累加算法,建议8次或者16次,用移位来计算结果。因为430的除法是用软件实现的,会占用大量的CPU时间。
谁帮我讲一下这段IAR的c语言程序,200分重谢!
4-ADC12应有例程
//******************************************************************************
//MSP430F149 ADC12模块+串行通讯的实验程序
//使用ADC12采集实验,将采集到数据送向PC.(单路单次采集)
//P3.4为发送,P3.5为接收 晶体使32768HZ/8MHZ. 串行波特率B/S
//使用SMCLK作为波特率发器时,不能使用LPM2,LPM3!
//以下程序已验证通过,初学者可直接使用.由时间仓促和水平有限,请读者批评指正.
//编写:
//******************************************************************************
#include msp430x14x.h
//********************************************
//表区
unsigned char number_table[]={'0','1','2','3','4','5','6','7','8','9'};
unsigned char display_buffer[]={0x00,0x00,0x00,0x00,0xff};
//*******************波特率***********300 600 1200 2400 4800 9600 19200 38400 76800 115200const
//************************************[0]**[1]**[2]*[3]**[4]**[5]***[6]***[7]****[8]***[9]*
unsigned char BaudrateUBR0[] ={0x6D,0x36,0x1B,0x0D,0x06,0x03, 0xA0, 0xD0, 0x68, 0x45};
unsigned const char BaudrateUBR1[] ={0x00,0x00,0x00,0x00,0x00,0x00, 0x01, 0x00, 0x00, 0x00};
unsigned const char BaudrateUMCTL[]={0x22,0xD5,0x03,0x6B,0x6F,0x4A, 0xC0, 0x40, 0x40, 0x4A};
unsigned char timp;
//变量区
unsigned int ADC0 ;
//子程序声明
void init (void); //初始化
void ADC12setup(void); //ADC12初始化
void BaudrateSetup(unsigned char U0); //UART0初始化
void data_converter(unsigned char *p,unsigned int vaule); //数据变换
void send_data(unsigned char *p); //串行口发送数组
//********************************************
void main(void)
{
init();
//主循环
for (;;)
{
LPM0;
ADC12CTL0 |= ADC12SC; //sampling open,AD转换完成后(ADC12BUSY=0),ADC12SC自动复位;
while((ADC12IFG BIT0) == 0); //等转换结束
ADC0 = ADC12MEM0; //读转换数据值,同时清ADC12IFG0标志
data_converter(display_buffer,ADC0); //数据变换
send_data(display_buffer); //发送数据
}
}
//********************************************************************************
void init(void)
{
WDTCTL = WDTPW + WDTHOLD; // 停止WDT
P1DIR=0x01;P1OUT=0x0f; //LED设置
BaudrateSetup(6);
ADC12setup();
_EINT(); // 全局中断使能
}
//**********************************************************************************
//串口接收中断,退出LPM0模式.
#pragma vector=USART0RX_VECTOR
__interrupt void usart0_rx (void)
{
LPM0_EXIT;
}
//**********************************************************************************
//ADC12初始化
void ADC12setup(void)
{
//ADC12设置**************************
P6SEL |= 0x01; //使用A/D通道 A0
ADC12CTL0 = ADC12ON ; //开ADC12内核,设SHT0=2 (N=4)
ADC12CTL1 = SHP ; //SAMPCON信号选为采样定时器输出
//ADC12内部参考电压设置
ADC12CTL0 |= REF2_5V; //选用内部参考电压为2.5V
ADC12CTL0 |= REFON; //内部参考电压打开
ADC12MCTL0 |= SREF_1; //R+=2.5V R-=VSS
//转换允许
ADC12CTL0 |= ENC ; //转换允许(上升沿)
ADC0=0x00;
}
//**********************************************************************************
//UART0初始化
void BaudrateSetup(unsigned char U0)
{
unsigned int i;
if(U05) //当U05时,启用XT2
{
BCSCTL1 = ~XT2OFF; //启动XT2,
do
{ IFG1 = ~OFIFG; //清OSCFault标志
for(i=0xFF;i0;i--); //延时等待
}
while((IFG1 OFIFG) != 0); //查OSCFault,为0时转换完成
BCSCTL2 |= SELS; //SMCLK为XT2
}
//UART0
P1OUT=0x00;
if(U05){UTCTL0=SSEL1;} // 时钟源:SMCLK
else{UTCTL0=SSEL0;} // 时钟源:ACLK
UCTL0 = ~SWRST; // SWRST复位, USART允许
UCTL0=CHAR; // 8bit
ME1|=UTXE0 + URXE0; // Enable Tx0,Rx0
IE1|=URXIE0; // RX使能
UBR00=BaudrateUBR0[U0]; // 低位分频器因子
UBR10=BaudrateUBR1[U0]; // 高位分频器因子
UMCTL0=BaudrateUMCTL[U0]; // 波特率调整因子
P3SEL |= 0x30; // 将P3.4,5使用外围模块 = USART0 TXD/RXD
P3DIR |= 0x10; // 将P3.4设为输出(发),P3.5默认为输入(收)
}
//**********************************************************************************
//数据变换
void data_converter(unsigned char *p,unsigned int value)
{
unsigned int m,n,j=0;
p[0]=number_table[value/1000];
m=value%1000;
p[1]=number_table[m/100];
n=m%100;
p[2]=number_table[n/10];
j=n%10;
p[3]=number_table[j/1];
}
//**********************************************************************************
//串行口发送数组
void send_data(unsigned char *p)
{unsigned int n;
timp=RXBUF0;
for(n=0;p[n]!=0xff;n++)
{
while ((IFG1 UTXIFG0) == 0); // USART0发送UTXIFG0=1,表示UTXBUF准备好发送一下字符
TXBUF0 = p[n];
}
}
//**********************************************************************************
//ADC12模块例程(1)结速
MSP430 AD部分的小问题
1) SHT1 / SHT0是采样保持时间长短设置。AD都有最小采样保持时间,不懂的话,百度下。这个和电路匹配还有芯片本身寄生电容、采样电容大小相关。
2)SHP 是用来选择 脉冲采样方式 (Pulse sample mode)还是扩展采样模式(Extended sample mode)
3)SAMPCON 实际是 触发采样动作到采样完成 的时间差。 这个要分 情况,看2中你选的是哪个模式。 扩展采样模式的话,SHI触发,那采样即时开始,SHI停止采样即时停止。 脉冲采样方式的话,SHi只是个触发信号而已,它需要和采样时钟(ADC12CLK)进行同步,同步后才能开始真正的采样。这时候你就看出SHT1/SHT0的作用了,它是用来确定采样保持时间的。
PS:采样时间= 采样保持时间(SHT1/SHT0决定) + 采样转换时间(12*ADC12CLK)