43oh  # Lode

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## Reputation Activity

1. Lode got a reaction from fatihinanc in G2553 I2C SCL/INT combined?
@@fatihinanc
eUSCI, what mcu are you on exactly?
Could be handy for the future.

And what scope is that? digital only one?

Furthermore
I don't see your "Calculation of the magnetic flux" as described in the User manual chapter 3, page 9?

This is what I got for that:
signed int TLV493D_flux12Bit(unsigned int r){     signed int c = 0;                                       //bit value     c -= (r & 0x0800) ? 0x0800 : 0;   //12 ~ 2048     c += (r & 0x0400) ? 0x0400 : 0;   //11 ~ 1024     c += (r & 0x0200) ? 0x0200 : 0;   //10 ~  512     c += (r & 0x0100) ? 0x0100 : 0;   // 9 ~  256     c += (r & 0x0080) ? 0x0080 : 0;   // 8 ~  128     c += (r & 0x0040) ? 0x0040 : 0;   // 7 ~   64     c += (r & 0x0020) ? 0x0020 : 0;   // 6 ~   32     c += (r & 0x0010) ? 0x0010 : 0;   // 5 ~   16     c += (r & 0x0008) ? 0x0008 : 0;   // 4 ~    8     c += (r & 0x0004) ? 0x0004 : 0;   // 3 ~    4     c += (r & 0x0002) ? 0x0002 : 0;   // 2 ~    2     c += (r & 0x0001) ? 0x0001 : 0;   // 1 ~    1     return c; } signed int TLV493D_flux8Bit(unsigned int r){     signed int c = 0;                                       //bit value     c -= (r & 0x0800) ? 0x80 : 0;     //12 ~  128     c += (r & 0x0400) ? 0x40 : 0;     //11 ~   64     c += (r & 0x0200) ? 0x20 : 0;     //10 ~   32     c += (r & 0x0100) ? 0x10 : 0;     // 9 ~   16     c += (r & 0x0080) ? 0x08 : 0;     // 8 ~    8     c += (r & 0x0040) ? 0x04 : 0;     // 7 ~    4     c += (r & 0x0020) ? 0x02 : 0;     // 6 ~    2     c += (r & 0x0010) ? 0x01 : 0;     // 5 ~    1     return c; } unsigned int  x=0, y=0, z=0;         //later in loop....         x = (r << 4) | ((r >> 4) & 0x0F);      // byte 0 + high nibble 4         y = (r << 4) | (r & 0x0F);                // byte 1 + low nibble 4         z = (r << 4) | (r & 0x0F);                // byte 2 + low nibble 5         printf("FRM: %d \n\r", ((r & 0x0C) >> 2));   // frame count         printf("CH:  %d \n\r",  (r & 0x03));         // channel 0=none or x, 1=y, 2=z, 3=temp         printf("PD:  %d \n\r", ((r & 0x10) >> 4));   // power down         printf("x: %d / %d \n\r", TLV493D_flux12Bit(x), TLV493D_flux8Bit(x));         printf("y: %d / %d \n\r", TLV493D_flux12Bit(y), TLV493D_flux8Bit(y));         printf("z: %d / %d \n\r", TLV493D_flux12Bit(z), TLV493D_flux8Bit(z)); FRM should increment 0,1,2,3, 0, etc.
CH should be zero meaning measurement is finalized.
2. Lode got a reaction from chicken in G2553 I2C SCL/INT combined?
@@fatihinanc
Out of the millions of chips out there, you guessed correctly!
Working on the same? Did you figure it out...

@@chicken,
i2c just uses P1.6 and P1.7 I believe?
void i2c_init(unsigned char addr, unsigned char prescale){     //P1.6 SCL / P1.7 SDA     P1SEL  |= BIT6 | BIT7;     P1SEL2 |= BIT6 | BIT7;         //... } Isn't P1.5 just used for SPI?
I will try your suggestion. Think the whole thing stranded when I do that.

As a general note I'm trying to see the Interrupt on my little DSO202 oscilloscope, but not really getting around with that thing.
Maybe the problem is that the pin is pulled high with 1.2kOhm resistor?

Will return with more findings, thanks for thinking with me :-)

EDIT:

I got it working, due to your hints/ideas.
For future reference this is quite simply it...
void main(void){ //setup... for(;{        //issue i2c command...         //P1.6 SCL disable         P1SEL  &= ~BIT6;         P1SEL2 &= ~BIT6;         P1IE   |=  BIT6;                            // interrupt         P1IES  |=  BIT6;                            // falling edge (default)         P1IFG  &= ~BIT6;                            // flag clear         __bis_SR_register(LPM4_bits);      // sleep         //-----------------------------------------------------------/         P1IE   &= ~BIT6;                            // !interrupt         //P1.6 SCL re-enable         P1SEL  |= BIT6;         P1SEL2 |= BIT6;                 //read i2c data } } #pragma vector=PORT1_VECTOR __interrupt void ISR_P1(void){     if(P1IFG & BIT6){         P1IFG &= ~BIT6;                        // clear flag         __bic_SR_register_on_exit(LPM4_bits);  // clear LPM bits, returns to main after last LPMx     } } Thanks again!

Now to make sense of the data
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