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Altera_Forum
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19 years ago

how to program use OpenCores I2C Master core in n2

hi all: I am useing the OpenCores I2C Master core in nios2 . But the core have no any documents to guide user. It just have a include file . I have writed the i2c read and write func...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

hi :

I write the i2c read and write function follow fischer's sample.

The write function is work fine.

But the read function hava a little problem.

I find the i2c will work fail after use the read function. The reason is I didn't send

the ACK to I2C slave. so the I2C slave still engross the I2C date.

I try some ways to send the ACK signel to slave ,but not success.

for instance:

*

*

*

IOWR(I2C_MASTER_0_BASE,I2C_CR,CR_IACK); //

IOWR(I2C_MASTER_0_BASE,I2C_CR,CR_NACK );

*data=IORD(I2C_MASTER_0_BASE,I2C_RXR);

*

*

*

Who can give me some advice? Thanks a lot!