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器件型号：MSP430FR2355 大家好、我使用示例代码来读取内部温度、但得到的结果是荒谬的。 以摄氏度为单位的稳态温度为55C (应为~室温)。 芯片发热会导致摄氏度不上升、这是我无法解释的、尤其是当原始 ADC 值不断增加时。
我正在使用的代码来自 Resource Explorer、并在下面重复使用。
问题- #define CALADC_15V_30C (0x1A1A)和 #define CALADC_15V_85C (0x1A1C)的存储器地址值是否正确？ 数据表中没有完全像写入的那些值、 我想这些值是 CAL_ADC_15T30和 CAL_ADC_15T85、它们的存储器偏移地址为0x8和0xB。
提前感谢。
理查德
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//******************************************************************************
// MSP430FR235x Demo - ADC, Sample A12 Temp and Convert to oC and oF
//
// Description: This example works on Single-Channel Single-Conversion Mode.
// A single sample is made on A12 (temperature) with reference to
// internal 1.5V Vref. Software sets ADCSC to start sample and conversion
// periodically
// - ADCSC automatically cleared at EOC. ADC internal oscillator times
// sample and conversion. In Mainloop MSP430 waits in LPM3 to save power until
// ADC conversion complete, ADC12_ISR will convert the result to oC and oF
//
// ACLK = default REFO ~32768Hz, MCLK = SMCLK = default DCODIV ~1MHz.
//
// Uncalibrated temperature measured from device to device will vary due to
// slope and offset variance from device to device - please see datasheet.
//
// This code example show how to use the TLV calibrated data to measure temperature.
// This code example is for industrial temperature device which operating temperature range is -40oC ~ +85oC.
// For extended temperature device (-40oC ~ +105oC), ADC calibration result is for 105oC - please see datasheet.
//
// MSP430FR2355
// -----------------
// /|\| |
// | | |
// --|RST |
// | |
// >---|A12(temp) |
//
//
// Winter Yu
// Texas Instruments Inc.
// April. 2018
// Built with IAR Embedded Workbench v7.10 & Code Composer Studio v7.2
//******************************************************************************
#include <msp430.h>
#define CALADC_15V_30C *((unsigned int *)0x1A1A) // Temperature Sensor Calibration-30 C
// See device datasheet for TLV table memory mapping
#define CALADC_15V_85C *((unsigned int *)0x1A1C) // Temperature Sensor Calibration-High Temperature (85 for Industrial, 105 for Extended)
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
TB0CCTL0 |= CCIE; // TBCCR0 interrupt enabled
TB0CCR0 = 65535;
TB0CTL = TBSSEL__ACLK | MC__UP; // ACLK, UP mode
// Configure ADC - Pulse sample mode; ADCSC trigger
ADCCTL0 |= ADCSHT_8 | ADCON; // ADC ON,temperature sample period>30us
ADCCTL1 |= ADCSHP; // s/w trig, single ch/conv, MODOSC
ADCCTL2 &= ~ADCRES; // clear ADCRES in ADCCTL
ADCCTL2 |= ADCRES_2; // 12-bit conversion results
ADCMCTL0 |= ADCSREF_1 | ADCINCH_12; // ADC input ch A12 => temp sense
ADCIE |=ADCIE0; // Enable the Interrupt request for a completed ADC_B conversion
// Configure reference
PMMCTL0_H = PMMPW_H; // Unlock the PMM registers
PMMCTL2 |= INTREFEN | TSENSOREN; // Enable internal reference and temperature sensor
__delay_cycles(400); // Delay for reference settling
__bis_SR_register(LPM0_bits | GIE); // LPM0 with interrupts enabled
__no_operation(); // Only for debugger
}
// ADC interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC_VECTOR
__interrupt void ADC_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(ADC_VECTOR))) ADC_ISR (void)
#else
#error Compiler not supported!
#endif
{
volatile float temp;
volatile float IntDegF;
volatile float IntDegC;
switch(__even_in_range(ADCIV,ADCIV_ADCIFG))
{
case ADCIV_NONE:
break;
case ADCIV_ADCOVIFG:
break;
case ADCIV_ADCTOVIFG:
break;
case ADCIV_ADCHIIFG:
break;
case ADCIV_ADCLOIFG:
break;
case ADCIV_ADCINIFG:
break;
case ADCIV_ADCIFG:
temp = ADCMEM0;
// Temperature in Celsius
// The temperature (Temp, C)=
IntDegC = (temp-CALADC_15V_30C)*(85-30)/(CALADC_15V_85C-CALADC_15V_30C)+30;
// Temperature in Fahrenheit
// Tf = (9/5)*Tc | 32
IntDegF = 9*IntDegC/5+32;
//__bic_SR_register_on_exit(LPM3_bits); // Exit LPM3
break;
default:
break;
}
}
// Timer B0 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER0_B0_VECTOR
__interrupt void Timer_B (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER0_B0_VECTOR))) Timer_B (void)
#else
#error Compiler not supported!
#endif
{
ADCCTL0 |= ADCENC | ADCSC; // Sampling and conversion start
}
