I2C transferring character

Ananya Pramanik

Other Parts Discussed in Thread: MSP430F5438A

Hello. I am using msp4305438A. The FET debugger is msp430-UIF. I want to transfer "HELLO" to a slave using I2C. My code is as follows. I am getting an error message that

Error:expected a declaration

Error while running C/C++ compiler.

#include"msp430.h"

{

WDTCTL = WDTPW + WDTHOLD;

UCB0CTL0 = UCA10_0 + UCSLA10_0 + UCMM_0 + UCMST_1 + UCMODE_3 + UCSYNC_1;

UCB0CTL1 = UCSSEL_2 + UCTR_1 + UCT0STT + UCSWRST;

unsigned char x[5]={0x48,0x45,0x4C,0x4C,0x4F};

char *ptr;

ptr = &x;

UCB0TXBUF = *ptr;

ptr++;

UCB0CTL1 = UCT0STP;

_EINT();

_BIS_SR(LPM0_bits);

while(1);

}

over 13 years ago

0 Andy Neil over 13 years ago

Guru 35565 points

Ananya Pramanik said:
I am getting an error message that
Error:expected a declaration

Note that this is a 'C' syntax issue - it has nothing specifically to do with I2C or the MSP430.

Where, exactly do you get that message?

Ananya Pramanik said:
Error while running C/C++ compiler.

Are you using it in 'C' or C++ mode?

Remember that 'C' is more restrictive about where declarations are allowed...

0 Ananya Pramanik over 13 years ago in reply to Andy Neil

Prodigy 95 points

hello sir,

please elaborate a little more on this. what sort of extension is the compiler talking about.

i am using it in embedded c++ mode.

regards

0 Jens-Michael Gross over 13 years ago

Guru 227245 points

If this is your code,w ell, teh compiler is right. It is tellign you that it expects a declaration.

Following the C standard, I would also expect a declaration. Such as a function declaration.

Hint: maybe a function with the name 'main'?

Your code has only a function body without any context.

0 Norman Wong over 13 years ago in reply to Ananya Pramanik

Guru 26430 points

Beyond the C vs C++ syntax problems, I2C needs some more setup. Maybe take a look at the examples for your MSP430 variant.

http://www.ti.com/product/msp430f5438a
http://www.ti.com/litv/zip/slac375a

See files MSP430x54xA_uscib0_i2c_*.c.

0 Ananya Pramanik over 13 years ago in reply to Jens-Michael Gross

Prodigy 95 points

Thank you for your help sir.

Regards

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I2C transferring character