MSP430I2040: MSP430I2040

Santosh PG1

Part Number: MSP430I2040

Hi,

We are using MSP430i2040 for measuring the differential analog input and found there is a difference of 0.67mV in the ADC result when we short the A+ and A- terminal which should result in 0mV as the difference will be zero.

I have attached the schematics and the sample code used for testing, please let us know the gain or any other missing configuration that required to be added in the code.

#include "msp430i2040.h"

unsigned int storeone;

void main(void) {

__delay_cycles(3200); // Delay

__bis_SR_register(GIE);

while (1) {

SD24CCTL0 |= SD24SC;
while (!(SD24CCTL0 & SD24IFG))
;
storeone = SD24MEM0;
}
}

over 6 years ago

0 Bruce McKenney over 6 years ago

Guru 102835 points

Did you include a copy of low_level_init.c? That provides a function (_system_pre_init) which is automatically called to load the calibration constants. If you need it, there's a copy in the msp430i20xx_sd24_04 Example project (I'm pretty sure they're all the same):

http://dev.ti.com/tirex/explore/node?node=AF07UvYuuIkPyVw8AiNGLg__IOGqZri__LATEST

0 Santosh PG1 over 6 years ago in reply to Bruce McKenney

Prodigy 160 points

Hi Bruce,

The low_level_init.c file is included, any additional configurations are required??

Thanks,

Santosh.

0 Bruce McKenney over 6 years ago in reply to Santosh PG1

Guru 102835 points

I recall being able to get 0s from the SD24 by connecting the +/- together, though that was some years ago, and I was using my own program rather than one of the Examples. It now appears I broke my breakout board sometime since.

I suspect we'll need to wait for a Wizard to appear.