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F2013/ FG4618 I2C; receive buffer junk values

Krishna Thallapaka
Intellectual 770 points

Hello,

On the Slave receiver end(FG4618), I wrote:

short rcv_buf_address = 0x6E; // the address for UCB0RXBUF
const short *rcv_buf = &rcv_buf_address;

host_data = *rcv_buf;

 

But all I receive is junk values,

Krishna.

  • 0
    Guru 227245 points

    Aehm, what do you want with this code?

    &UCBRXBUF is the address of UCBRXBUF. Which might (or might not, I didn't check, as it ias always defined in the header files) be 0x6e.

    &rcv_buf_address, however, is the memory location of the rcv_buf_address variable and point somewher einto the ram area.

    Now you let rcv_buf point to the address of the rcv_buf_address variable and then you read from where rcv_buf points to. Which would give, let's guess, 0x6e?

    Not to mention that UCB0RXBUF is an unsigned char and not a short.

    Why don't you just use
    host_data=UCB0RXBUF;
    ?

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