G2553里面有没有温度传感器啊？？-457887107的回答

19条回答

457887107

2019-03-26 07:24

/*这是2012.1.3在官方网站http://processors.wiki.ti.com/index.php?title=MSP430_LaunchPad_(MSP-EXP430G2)#Complete_Projects 下载的，版本号：slac435b
*中文为本人http://wangfuchong.com添加的注释，切记不一定正确，仅供尽可能地快速了解程序的结构。
×还是有一些疑惑，总觉得有不够严谨的可能，大家帮助分析。
* main.c
*
* MSP-EXP430G2-LaunchPad User Experience Application
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/******************************************************************************
* MSP-EXP430G2-LaunchPad User Experience Application
*
* 1. Device starts up in LPM3 + blinking LED to indicate device is alive
* + Upon first button press, device transitions to application mode
* 2. Application Mode
* + Continuously sample ADC Temp Sensor channel, compare result against
* initial value
* + Set PWM based on measured ADC offset: Red LED for positive offset, Green
* LED for negative offset
* + Transmit temperature value via TimerA UART to PC
* + Button Press --> Calibrate using current temperature
* Send character '? via UART, notifying PC
*
* Changes:
*
* 1.2 + Updated register naming conventions to reflect latest standard by TI
* e.g.: CCR0 --> TACCR0, CCTL0 --> TACCTL0
* + Changed method to capture TAR value into TACCR0 by using capture a
* SW-triggered event. [Changing TACCR input from GND to VCC]
× 1.2是与版本slac435a相比新更改的部分
* 1.1 + LED1 & LED2 labels changed so that Green LED(LED2) indicates sampled
* temperature colder than calibrated temperature and vice versa
* with Red LED (LED1).
* + Turn off peripheral function of TXD after transmitting byte to
* eliminate the extra glitch at the end of UART transmission
* 1.0 Initial Release Version
*
* Texas Instruments, Inc.
******************************************************************************/
#include "msp430g2231.h"
#define LED1 BIT0 //绿灯，BIT0，BIT6之类的是宏定义，请在头文件"msp430g2231.h"中查看
#define LED2 BIT6 //红灯，参见MSP-EXP430G2 LaunchPad Experimenter Board User's Guide
#define LED_DIR P1DIR
#define LED_OUT P1OUT
#define BUTTON BIT3 //P1.3为板上按键S2
#define BUTTON_OUT P1OUT //端口输出寄存器
#define BUTTON_DIR P1DIR //端口方向控制寄存器
#define BUTTON_IN P1IN //端口输入寄存器
#define BUTTON_IE P1IE //端口中断允许寄存器
#define BUTTON_IES P1IES //端口中断触发沿控制寄存器
#define BUTTON_IFG P1IFG //端口中断标志寄存器
#define BUTTON_REN P1REN //端口上下拉电阻使能控制寄存器
#define TXD BIT1 // TXD on P1.1
#define RXD BIT2 // RXD on P1.2
#define APP_STANDBY_MODE 0 //待机模式标志，也就是接上电源（或USB）后红绿灯交替闪的状态
#define APP_APPLICATION_MODE 1 //应用模式标志，也就是待机模式时按按键后进入的状态，也就是测量温度
#define TIMER_PWM_MODE 0
#define TIMER_UART_MODE 1 //串口模式状态
#define TIMER_PWM_PERIOD 2000
#define TIMER_PWM_OFFSET 20
#define TEMP_SAME 0
#define TEMP_HOT 1
#define TEMP_COLD 2
#define TEMP_THRESHOLD 5
// Conditions for 9600/4=2400 Baud SW UART, SMCLK = 1MHz
#define Bitime_5 0x05*4 // ~ 0.5 bit length + small adjustment
#define Bitime 13*4//0x0D
#define UART_UPDATE_INTERVAL 1000 //主循环次数进行一次串口发送温度值
unsigned char BitCnt;
unsigned char applicationMode = APP_STANDBY_MODE; //功能模式标志，初始值为待机模式
unsigned char timerMode = TIMER_PWM_MODE;
unsigned char tempMode;
unsigned char calibrateUpdate = 0;
unsigned char tempPolarity = TEMP_SAME;
unsigned int TXByte;
/* Using an 8-value moving average filter on sampled ADC values */
long tempMeasured[8]; //定义数组以计算8次10位ADC温度采样的平均值
unsigned char tempMeasuredPosition=0; //温度测量值数组索引
long tempAverage; //8次10位ADC温度采样的平均值
long tempCalibrated, tempDifference;
void InitializeLeds(void); //IO端口初始化，设置两颗LED对应的端口并两设置为熄灭初始状态
void InitializeButton(void); //IO端口初始化，配置按键
void PreApplicationMode(void); //进入待机模式，红绿灯交替闪，等待按键 Blinks LED, waits for button press
void ConfigureAdcTempSensor(void); //配置温度传感器模数转换
void ConfigureTimerPwm(void); //配置定位器为PWM模式
void ConfigureTimerUart(void); //配置定时器为Uart模式
void Transmit(void); //串口发送子程序
void InitializeClocks(void); //初始化时钟系统
void main(void)
{
unsigned int uartUpdateTimer = UART_UPDATE_INTERVAL; //主循环次数进行一次串口发送温度值
unsigned char i;
WDTCTL = WDTPW + WDTHOLD; // 停止看门狗 Stop WDT
InitializeClocks(); //初始化时钟系统
InitializeButton(); //配置按键
InitializeLeds(); //设置端口并两设置两颗LED对应为熄灭初始状态
PreApplicationMode(); //进入待机模式，红绿灯交替闪，等待按键 Blinks LEDs, waits for button press
//执行PreApplicationMode()将进入低功耗模式，程序停止在此，直到有按键按下
/* 进入应用模式 Application Mode begins */
applicationMode = APP_APPLICATION_MODE; //功能模式标志变成应用模式
ConfigureAdcTempSensor(); //配置温度传感器模数转换
ConfigureTimerPwm(); //配置定位器PWM模式
__enable_interrupt(); //使能全局中断 Enable interrupts.
/* Main Application Loop */
while(1)
{
ADC10CTL0 |= ENC + ADC10SC; //ADC使能，ADC开始转换一次 Sampling and conversion start
__bis_SR_register(CPUOFF + GIE); //进入省电模式LPM0，等待AD转换完成中断 LPM0 with interrupts enabled
/* Moving average filter out of 8 values to somewhat stabilize sampled ADC */
tempMeasured[tempMeasuredPosition++] = ADC10MEM; //将温度采样值存入温度值数组下一位
if (tempMeasuredPosition == 8)
tempMeasuredPosition = 0; 复位温度采样值数组索引
tempAverage = 0;
for (i = 0; i < 8; i++)
tempAverage += tempMeasured[i]; //累加温度采样值数组各值
tempAverage >>= 3; //除以8得到平均值 Divide by 8 to get average
if ((--uartUpdateTimer == 0) || calibrateUpdate ) //如果主循环了UART_UPDATE_INTERVAL次或者参考温度按键按过
{
ConfigureTimerUart();
if (calibrateUpdate)
{
TXByte = 248; // A character with high value, outside of temp range
Transmit(); //串口发送值248表示按键按下进行了校准参考
calibrateUpdate = 0; //复位参考温度校准标志变量
}
TXByte = (unsigned char)( ((tempAverage - 630) * 761) / 1024 ); //计算温度华氏值
Transmit(); //串口发送华氏温度值
uartUpdateTimer = UART_UPDATE_INTERVAL; //复位循环计数变量
ConfigureTimerPwm(); //配置定时器回PWM模式
}
tempDifference = tempAverage - tempCalibrated; //计算相对于参考温度的差值
if (tempDifference < -TEMP_THRESHOLD) //如果采样温度值低于参考温度值差值TEMP_THRESHOLD
{
tempDifference = -tempDifference; //差值取正
tempPolarity = TEMP_COLD; //极性变量设为值TEMP_COLD
LED_OUT &= ~ LED1; //LED1绿灯置灭
}
else
if (tempDifference > TEMP_THRESHOLD) //如果采样温度值高于参考温度值差值TEMP_THRESHOLD
{
tempPolarity = TEMP_HOT; //极性变量设为值TEMP_COLD
LED_OUT &= ~ LED2; //LED2红灯置灭
}
else //如果相对于参考温度值偏差没有超过阈值TEMP_THRESHOLD
{
tempPolarity = TEMP_SAME; //性变量设为值TEMP_SAME
TACCTL0 &= ~CCIE; //关TACCTL0中断使能
TACCTL1 &= ~CCIE; //关TACCTL1中断使能
LED_OUT &= ~(LED1 + LED2); //置两灯皆灭
}
if (tempPolarity != TEMP_SAME) //如果相对于参考温度值偏差超过阈值TEMP_THRESHOLD
{
tempDifference <<= 3; //温度偏差值乘以8
tempDifference += TIMER_PWM_OFFSET; //加上一个偏置值
TACCR1 = ( (tempDifference) < (TIMER_PWM_PERIOD-1) ? (tempDifference) : (TIMER_PWM_PERIOD-1) ); //置TACCR1，最大为TIMER_PWM_PERIOD-1。
//TACCR1值控制亮的时间，定时器计数到TACCR1在中断中将关闭灯，在TACCR0中断中亮灯
TACCTL0 |= CCIE; //开TACCTL0中断使能
TACCTL1 |= CCIE; //开TACCTL1中断使能
}
} //返回主循环
}
//进入待机模式，红绿灯交替闪，等待按键
void PreApplicationMode(void)
{
LED_DIR |= LED1 + LED2; //p1.0和P1.6口为输出
LED_OUT |= LED1; //绿灯亮 To enable the LED toggling effect
LED_OUT &= ~LED2; //红灯灭
BCSCTL1 |= DIVA_1; //辅助时钟分频设置为2 ，ACLK=6KHz
BCSCTL3 |= LFXT1S_2; //辅助时钟源选择VLOCLK，12KHz //ACLK = VLO
TACCR0 = 1200; //
TACTL = TASSEL_1 | MC_1; //定时器时钟源选择辅助时钟ACLK，增计数模式 // TACLK = SMCLK, Up mode.
TACCTL1 = CCIE + OUTMOD_3; //捕获/比较控制寄存器1设置为比较模式，输出模式为“置位/复位” ，中断允许 // TACCTL1 Capture Compare
TACCR1 = 600;
__bis_SR_register(LPM3_bits + GIE); // LPM0 with interrupts enabled ？？低功耗模式LPM3
//此时cpu停止，等待中断，如果是比较1中断，则进入中断程序：ta1_isr(void)，因为是CC1。
//如果是按键中断，则进入PORT1_ISR(void)中断服务程序，在PORT1_ISR(void)中将退出此低功耗模式
}
//配置温度传感器模数转换
void ConfigureAdcTempSensor(void)
{
unsigned char i;
/* Configure ADC Temp Sensor Channel */
ADC10CTL1 = INCH_10 + ADC10DIV_3; //选择ADC通道为温度传感器，时钟4分频 // Temp Sensor ADC10CLK/4
ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE; // VR+ = VREF+ and VR- = VSS，采样保持时间=64×ADC10CLK周期，打开内部参考电压，打开ADC模块，ADC中断允许
__delay_cycles(1000); //延时等待ADC参考电压建立 // Wait for ADC Ref to settle
ADC10CTL0 |= ENC + ADC10SC; //ADC使能，ADC开始转换一次 // Sampling and conversion start
__bis_SR_register(CPUOFF + GIE); //进入省电模式LPM0，等待AD转换完成中断 // LPM0 with interrupts enabled
tempCalibrated = ADC10MEM;
for (i=0; i < 8; i++)
tempMeasured[i] = tempCalibrated;
tempAverage = tempCalibrated; //第一次转换，平均温度取样值和校准值相等
}
//配置定位器为PWM模式
void ConfigureTimerPwm(void)
{
timerMode = TIMER_PWM_MODE;
TACCR0 = TIMER_PWM_PERIOD; //
TACTL = TASSEL_2 | MC_1; //定时器时钟源选择辅助时钟SMCLK，增计数模式 // TACLK = SMCLK, Up mode.
TACCTL0 = CCIE;
TACCTL1 = CCIE + OUTMOD_3; //捕获/比较控制寄存器1设置为比较模式，输出模式为“置位/复位” ，中断允许？？OUTMOD_3有什么用？ // TACCTL1 Capture Compare
TACCR1 = 1;
}
//配置定时器为Uart模式
void ConfigureTimerUart(void)
{
timerMode = TIMER_UART_MODE; // Configure TimerA0 UART TX
TACCTL0 = OUT; //输出为高电平 // TXD Idle as Mark
TACTL = TASSEL_2 + MC_2 + ID_3; //定时器时钟源选择辅助时钟SMCLK，连续计数模式，时钟8分频 // SMCLK/8, continuous mode
P1SEL |= TXD + RXD; //打开P1.1，P1.2引脚特殊功能
P1DIR |= TXD; //P1.1端口方向为输出
}
//串口发送子程序 Function Transmits Character from TXByte
void Transmit()
{
BitCnt = 0xA; //低电平起始位+8位数据+高电平停止位共10位 // Load Bit counter, 8data + ST/SP
/* Simulate a timer capture event to obtain the value of TAR into the TACCR0 register */
//模仿捕捉模式以获得当前的TAR值赋予TACCR0
TACCTL0 = CM_1 + CCIS_2 + SCS + CAP + OUTMOD0; //上升沿捕捉，输入源为GND，输出模式置位模式 //capture on rising edge, initially set to GND as input // clear CCIFG flag
TACCTL0 |= CCIS_3; //改变输入源为VCC，相当于输入源上升沿变化，触发捕捉//change input to Vcc, effectively rising the edge, triggering the capture action
while (!(TACCTL0 & CCIFG)); //查询TACCTL0中断标志位 //allowing for the capturing//updating TACCR0.
TACCR0 += Bitime ; //首位发送延时 // Some time till first bit
TXByte |= 0x100; //增加停止位 // Add mark stop bit to TXByte
TXByte = TXByte << 1; //左移一位右边添加一位0表示起始位 // Add space start bit
TACCTL0 = CCIS0 + OUTMOD0 + CCIE; //比较模式，OUTMOD0=OUTMOD_1输出模式为置位模式，清中断标志，中断允许 // TXD = mark = idle
while ( TACCTL0 & CCIE ); //循环，直到反复中断中完成发送 // Wait for TX completion
}
//TACCR0中断专用， Timer A0 interrupt service routine
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
if (timerMode == TIMER_UART_MODE) //定时器为Uart模式
{
TACCR0 += Bitime; //TACCR0加上一位串口数据所需的计数量，准备下一次中断 // Add Offset to TACCR0
if (TACCTL0 & CCIS0) //为什么要？ TX on CCI0B?
{
if ( BitCnt == 0) //如果全部发送完成
{
P1SEL &= ~(TXD+RXD); //取消引脚特殊功能
TACCTL0 &= ~ CCIE ; //关闭中断使能 // All bits TXed, disable interrupt
}
else
{
TACCTL0 |= OUTMOD2; //注意是“或”运算，设置成复位模式（原来为复位OUTMOD0，现在为OUTMOD_3） // TX Space
if (TXByte & 0x01)
TACCTL0 &= ~ OUTMOD2; //如果发送的是1，输出模式转为置位模式 // TX Mark
TXByte = TXByte >> 1; //右移一位，准备下一位发送
BitCnt --; //发送位计数
}
}
}
else //定位器为PWM模式
{
if (tempPolarity == TEMP_HOT)
LED_OUT |= LED1; //如果相对于参考温度偏差为正，LED1绿灯置为亮
if (tempPolarity == TEMP_COLD)
LED_OUT |= LED2; //如果相对于参考温度偏差为负，LED2红灯置为亮
TACCTL0 &= ~CCIFG; //清中断标志位??有必要么?不是自动清除？
}
}
//TACCR1和定时器共用中断向量
#pragma vector=TIMERA1_VECTOR
__interrupt void ta1_isr(void)
{
TACCTL1 &= ~CCIFG; //捕获比较中断标志CCIFG。比较模式：定时器 TAR 值等于寄存器 CCR1 值时CCIFG置位。需手动清除
if (applicationMode == APP_APPLICATION_MODE)
LED_OUT &= ~(LED1 + LED2); //如果程序运行至是应用模式，置两灯皆灭
else
LED_OUT ^= (LED1 + LED2); //如果是待机模式，异或，原来两个灯本来就是一亮一灭的，所以反复中断的效果是交替闪烁。PreApplicationMode(void)中
}
void InitializeClocks(void)
{
BCSCTL1 = CALBC1_1MHZ; //用FLASH中信息存贮器A段的校准数据设置基本时钟系统控制寄存器 1 // Set range
DCOCTL = CALDCO_1MHZ; //用FLASH中信息存贮器A段的校准数据设置 DCO 控制寄存器，设置DCO校准为1MHz，详细原理请查看G2系列芯片的Users Guide
BCSCTL2 &= ~(DIVS_3); //SMCLK为0分频DCO // SMCLK = DCO = 1MHz
}
void InitializeButton(void) // Configure Push Button
{
BUTTON_DIR &= ~BUTTON; //按键对应的端口方向为输入
BUTTON_OUT |= BUTTON; //设置输出寄存器对应的按键位为1
BUTTON_REN |= BUTTON; //使能上拉电阻，因为对应的输出寄存器位为1。反之如果对应的输出寄存器位为0则自动选择下拉电阻。
BUTTON_IES |= BUTTON; //选择下降沿中断
BUTTON_IFG &= ~BUTTON; //中断标志清零
BUTTON_IE |= BUTTON; //按键中断允许
}
//设置两颗LED对应的端口并两设置为熄灭初始状态
void InitializeLeds(void)
{
LED_DIR |= LED1 + LED2; //P1DIR=BIT1+BIT6 p1.0和P1.6口为输出
LED_OUT &= ~(LED1 + LED2); //两个LED低电平熄灭
}
/* *************************************************************
* Port Interrupt for Button Press
* 1. During standby mode: to exit and enter application mode
* 2. During application mode: to recalibrate temp sensor
* *********************************************************** */
#pragma vector=PORT1_VECTOR
__interrupt void PORT1_ISR(void)
{
BUTTON_IFG = 0; //清P1口所有中断标志
BUTTON_IE &= ~BUTTON; //禁止按键中断使能，防抖动，经过看门狗定时器延时在看门狗定时器中断中再打开 /* Debounce */
WDTCTL = WDT_ADLY_250; //=(WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL+WDTIS0)看门狗设置为定时器模式，计数清零，时钟源为辅助时钟ACLK，定时周期为Taclk×32768
IFG1 &= ~WDTIFG; //清看门狗定时器中断标志 /* clear interrupt flag */
IE1 |= WDTIE; //使能看门狗定时器中断
if (applicationMode == APP_APPLICATION_MODE) //如果是应用模式
{
tempCalibrated = tempAverage; //？？？如果中断发生在for (i = 0; i < 8; i++) tempAverage += tempMeasured[i];不是错了么？
calibrateUpdate = 1; //参考温度校准标志变量
}
else
{
applicationMode = APP_APPLICATION_MODE; //由待机模式切换到应用模式 // Switch from STANDBY to APPLICATION MODE
__bic_SR_register_on_exit(LPM3_bits); //退出低功耗模式LPM3
}
}
// WDT Interrupt Service Routine used to de-bounce button press
#pragma vector=WDT_VECTOR
__interrupt void WDT_ISR(void)
{
IE1 &= ~WDTIE; //禁止看门狗定时器中断 /* disable interrupt */
IFG1 &= ~WDTIFG; //清看门狗定时器中断标志 /* clear interrupt flag */
WDTCTL = WDTPW + WDTHOLD; //使看门狗关闭状态 /* put WDT back in hold state */
BUTTON_IE |= BUTTON; //使能按键中断 /* Debouncing complete */
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
__bic_SR_register_on_exit(CPUOFF); //退出省电模式 // Return to active mode
}

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