Hi forum members, i am actually facing some problem regarding ADC12 of my MSP430FG4618/F2013 experimenter's board. When i am trying to run the TI code" MSP430xG461x Demo - ADC12, Using the Internal Reference" i found that the "watch window" show me the garbage value of 0x000140 in my code composer studio(version 4.2). In the TI code the internal reference voltage is 2.5v and i choose the input voltage 2.5v DC, so the output should be 0xFF instead of 0x000140. In my settings i give +2.5v DC to channel A0 which is P6.0 and ground the board in the DVss1 which is internally grounded with JTAG2 pin NO.5. I just give the TI code and the image of the setup below.
//******************************************************************************
// MSP430xG461x Demo - ADC12, Using the Internal Reference
//
// This example shows how to use the internal reference of the ADC12.
// It uses the internal 2.5V reference and performs a single conversion
// on channel A0. The conversion results are stored in ADC12MEM0. Test by
// applying a voltage to channel A0, then setting and running to a breakpoint
// at "__no_operation()".
// To view the conversion results, open a register window in Debugger and
// view the contents of ADC12MEM0.
// ACLK = 32kHz, MCLK = SMCLK = default DCO 1048576Hz, ADC12CLK = ADC12OSC
//
//
// MSP430xG461x
// ---------------
// | XIN|-
// | | 32kHz
// Vin -->|P6.0/A0 XOUT|-
// | |
//
//
// A. Dannenberg/ M. Mitchell
// Texas Instruments Inc.
// October 2006
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430xG46x.h"
volatile unsigned int i;
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog
P6SEL |= 0x01; // Enable A/D channel A0
ADC12CTL0 = REFON + REF2_5V + ADC12ON + SHT0_2;
// turn on 2.5V ref, set samp time
ADC12CTL1 = SHP; // Use sampling timer
ADC12MCTL0 = SREF_1; // Vr+=Vref+
for (i = 0x3600; i; i--); // Delay for needed ref start-up.
// See datasheet for details.
ADC12CTL0 |= ENC; // Enable conversions
while (1)
{
ADC12CTL0 |= ADC12SC; // Start conversions
while (!(ADC12IFG & 0x0001)); // Conversion done?
ADC12MEM0; // Access result
__no_operation(); // SET BREAKPOINT HERE
}
}
===================================================
And the CCS window is given below
So this is the all about. If anybody have the solution please give me the reply.
Best Regards
Souvik
