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20 Nov 2009

Harman replied to Problem in Transmitting Data in SPI COmmunication. in MSP430 Ultra-Low Power Microcontrollers .

Harman replied to Software delay problem??? in MSP430 Ultra-Low Power Microcontrollers .

Harman replied to can any body give me any link of 4 PIN SPI routines in MSP430 Ultra-Low Power Microcontrollers .

Harman replied to IAR Embedded Workbench Kickstart for MSP430 v4.21 in MSP430 Ultra-Low Power Microcontrollers .

13 Nov 2009

Harman replied to Blood pressure measurements? in MSP430 Ultra-Low Power Microcontrollers .

10 Nov 2009

Harman replied to Analog input on eZ430-F2013 in MSP430 Ultra-Low Power Microcontrollers .

Harman replied to Blood pressure measurements? in MSP430 Ultra-Low Power Microcontrollers .

9 Nov 2009

Harman replied to lcd for msp430 in MSP430 Ultra-Low Power Microcontrollers .

6 Nov 2009

Harman replied to MSP-FET430U28 initial setup in MSP430 Ultra-Low Power Microcontrollers .

Harman replied to Blood pressure measurements? in MSP430 Ultra-Low Power Microcontrollers .

29 Oct 2009

Harman replied to BIasing LCD in MSP430 Ultra-Low Power Microcontrollers .

23 Oct 2009

Harman replied to MSP430F5348 - ADC12_A - Sampling Rate in MSP430 Ultra-Low Power Microcontrollers .

Harman replied to firmware update over the air in MSP430 Ultra-Low Power Microcontrollers .

Harman replied to Sigma delta with PGA input? in MSP430 Ultra-Low Power Microcontrollers .

15 Oct 2009

Harman replied to SCG0 bit and LPM modes in MSP430 Ultra-Low Power Microcontrollers .

My Comments

YING-CHANG CHENG wrote Sorry for the Font Messy

on 17 Aug 2009 2:05 AM

Hi,

I just saw your reply on "Using the SD16 of the MSP430 F2013 to measure supply voltage" and it was quite clear. However, when I practiced the code example "msp430x20x3_sd16A_01.c" (as shown below) and downloaded it into my EZ430 stick, I could not get stable voltage value (variation was large).

////

msp430x20x3_sd16A_01.c

////

In this example, I think the SD16 can only sense 0v to 0.6volt (please correct me if I am wrong). Therefore, I set up a simple example in which I used a DC supply, 0.6 volt connecting with a series of resistors R1 (1KOhm) and R2 ( 2KOhm) to GND; I fed the R2 voltage (0.4v) and GND into my EZ430 input hole P4 and P5 respectively. When I set a break point in "__interrupt void SD16ISR(void) " and press GO, the SD16MEM0 value I got from each break was not the same, and the value varied from 30000 to 40000. I also thought the SD16MEM0 of 0.6V should be 65535, but I still got an unstable result. Do you have any suggestion for me? If possible, could you email me some instruction? Thank you so much.

Allen (chengyc0314@gmail.com)

Normal 0 0 2 false false false MicrosoftInternetExplorer4

YING-CHANG CHENG wrote Question in Using EZ430_f2013 / SD16 module

on 17 Aug 2009 2:00 AM

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Hi,

/////////////////////////////

#include <msp430x20x3.h>
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
P1DIR |= 0x01;                            // Set P1.0 to output direction
SD16CTL = SD16REFON + SD16SSEL_1;         // 1.2V ref, SMCLK
SD16INCTL0 = SD16INCH_1;                  // A1+/-
SD16CCTL0 = SD16UNI + SD16IE;            // 256OSR, unipolar, interrupt enable
//SD16AE = SD16AE2;                         // P1.1 A1+, A1- = VSS
SD16AE = SD16AE2 + SD16AE3;
SD16CCTL0 |= SD16SC;                      // Set bit to start conversion

_BIS_SR(LPM0_bits + GIE);
}

#pragma vector = SD16_VECTOR
__interrupt void SD16ISR(void)
{
if (SD16MEM0 < 0x7FFF)                   // SD16MEM0 > 0.3V?, clears IFG
    P1OUT &= ~0x01;
else
    P1OUT |= 0x01;
}
/////////////////////////////////////////////

Normal 0 0 2 false false false MicrosoftInternetExplorer4  /* Style Definitions */ table.MsoNormalTable {mso-style-name:表格內文; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}

In this example, I think the SD16 can only sense 0v to 0.6volt (please correct me if I am wrong). Therefore, I set up a simple example in which I used a DC supply, 0.6 volt connecting with a series of resistors R1 (1KOhm) and R2 ( 2KOhm) to GND; I fed the R2 voltage (0.4v) and GND into my EZ430 input hole P4 and P5 respectively. When I set a break point in “__interrupt void SD16ISR(void) “ and press GO, the SD16MEM0 value I got from each "break" was not the same, and the value varied from 30000 to 40000. I also thought the SD16MEM0 of 0.6V should be 65535, but I still got an unstable result. Do you have any suggestion for me? If possible, could you email me some feedback? Thank you so much.

Allen (chengyc0314@gmail.com)