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207 lines
7.7 KiB
C
207 lines
7.7 KiB
C
// *************************************************************************************************
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//
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// Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
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//
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// *************************************************************************************************
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// ADC12 functions.
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// *************************************************************************************************
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// *************************************************************************************************
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// Include section
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// system
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#include <project.h>
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// driver
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#include "adc12.h"
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#include "timer.h"
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// *************************************************************************************************
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// Prototypes section
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// *************************************************************************************************
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// Defines section
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// *************************************************************************************************
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// Global Variable section
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u16 adc12_result;
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u8 adc12_data_ready;
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// *************************************************************************************************
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// Extern section
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//
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//
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//// *************************************************************************************************
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//// @fn adc12_single_conversion
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//// @brief Init ADC12. Do single conversion. Turn off ADC12.
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//// @param none
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//// @return none
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//// *************************************************************************************************
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//u16 adc12_single_conversion(u16 ref_v, u16 adc12_sht, u16 adc12_ssel, u16 adc12_vref, u16 adc12_channel, u16 adc12_conv_delay)
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//{
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// u16 adc12_result;
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//
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// // Set REF reference voltage to 1.5V (temperature) or 2.5V (battery)
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// REFCTL0 |= REFMSTR + REFON + ref_v;
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//
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// // Initialize ADC12
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// ADC12CTL0 = ADC12ON + adc12_sht;
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// ADC12CTL1 = ADC12SHP + adc12_ssel; // Use sampling timer, ADC12CLK = ACLK
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// ADC12CTL2 = ADC12RES_2 + ADC12SR; // 12-bit mode, 50ksps
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// ADC12MCTL0 = adc12_vref + adc12_channel; // Set reference, set input channel
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//
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// // Wait until ADC12 reference voltage has settled
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// Timer0_A4_Delay(CONV_US_TO_TICKS(ADC12_REFERENCE_SETTLING_TIME_USEC));
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//
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// // Start conversion
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// ADC12CTL0 |= ADC12ENC | ADC12SC;
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//
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// // Wait until ADC12 has finished
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// Timer0_A4_Delay(CONV_US_TO_TICKS(adc12_conv_delay));
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// while ((ADC12CTL1 & ADC12BUSY) == ADC12BUSY);
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//
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// // Store measurement result
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// adc12_result = ADC12MEM0;
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//
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// // Shut down ADC12
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// ADC12CTL0 &= ~(ADC12ENC | ADC12SC);
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// ADC12CTL0 &= ~ADC12ON;
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//
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// // Shut down reference voltage
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// REFCTL0 &= ~(REFMSTR + REFVSEL_2 + REFON);
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//
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// // Return ADC result
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// return (adc12_result);
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//}
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// *************************************************************************************************
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// @fn adc12_single_conversion
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// @brief Init ADC12. Do single conversion. Turn off ADC12.
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// @param none
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// @return none
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// *************************************************************************************************
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u16 adc12_single_conversion(u16 ref, u16 sht, u16 channel)
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{
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// Initialize the shared reference module
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REFCTL0 |= REFMSTR + ref + REFON; // Enable internal reference (1.5V or 2.5V)
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// Initialize ADC12_A
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ADC12CTL0 = sht + ADC12ON; // Set sample time
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ADC12CTL1 = ADC12SHP; // Enable sample timer
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ADC12MCTL0 = ADC12SREF_1 + channel; // ADC input channel
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ADC12IE = 0x001; // ADC_IFG upon conv result-ADCMEMO
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// Wait 2 ticks (66us) to allow internal reference to settle
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Timer0_A4_Delay(2);
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// Start ADC12
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ADC12CTL0 |= ADC12ENC;
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// Clear data ready flag
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adc12_data_ready = 0;
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// Sampling and conversion start
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ADC12CTL0 |= ADC12SC;
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// Wait until ADC12 has finished
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Timer0_A4_Delay(5);
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while (!adc12_data_ready);
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// Shut down ADC12
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ADC12CTL0 &= ~(ADC12ENC | ADC12SC | sht);
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ADC12CTL0 &= ~ADC12ON;
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// Shut down reference voltage
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REFCTL0 &= ~(REFMSTR + ref + REFON);
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ADC12IE = 0;
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// Return ADC result
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return (adc12_result);
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}
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// *************************************************************************************************
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// @fn ADC12ISR
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// @brief Store ADC12 conversion result. Set flag to indicate data ready.
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// @param none
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// @return none
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// *************************************************************************************************
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//pfs wrapped the following to accommodate mspgcc compiler
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#ifdef __GNUC__
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#include <signal.h>
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interrupt (ADC12_VECTOR) ADC12ISR (void)
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#else
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#pragma vector=ADC12_VECTOR
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__interrupt void ADC12ISR (void)
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#endif
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{
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switch(__even_in_range(ADC12IV,34))
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{
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case 0: break; // Vector 0: No interrupt
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case 2: break; // Vector 2: ADC overflow
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case 4: break; // Vector 4: ADC timing overflow
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case 6: // Vector 6: ADC12IFG0
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adc12_result = ADC12MEM0; // Move results, IFG is cleared
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adc12_data_ready = 1;
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_BIC_SR_IRQ(LPM3_bits); // Exit active CPU
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break;
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case 8: break; // Vector 8: ADC12IFG1
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case 10: break; // Vector 10: ADC12IFG2
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case 12: break; // Vector 12: ADC12IFG3
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case 14: break; // Vector 14: ADC12IFG4
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case 16: break; // Vector 16: ADC12IFG5
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case 18: break; // Vector 18: ADC12IFG6
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case 20: break; // Vector 20: ADC12IFG7
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case 22: break; // Vector 22: ADC12IFG8
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case 24: break; // Vector 24: ADC12IFG9
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case 26: break; // Vector 26: ADC12IFG10
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case 28: break; // Vector 28: ADC12IFG11
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case 30: break; // Vector 30: ADC12IFG12
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case 32: break; // Vector 32: ADC12IFG13
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case 34: break; // Vector 34: ADC12IFG14
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default: break;
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}
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}
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