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Altera_Forum
Honored Contributor I
957 Views

DE2-70 adv7180

Hello. I can not initialize the adv7180 adc over i2c - no akcnowledgement returns when i write its address. The "reset" is tied to '1', also tried to follow datasheet (5ms reset -> program) it does not affect. Any ideas what can be wrong?

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3 Replies
Altera_Forum
Honored Contributor I
30 Views

Wrong address? Check read and write addresses.

Altera_Forum
Honored Contributor I
30 Views

IOWR_8DIRECT(I2C_BASE,OC_I2C_TXR,0x80); //write slave address+write bit IOWR_8DIRECT(I2C_BASE,OC_I2C_CR,0x90); //set STA, set WR 

The address is (according to de2 manual) 0x40. One bit shift to the left + write bit = 0x80. Also, when i register the isr, the first interrupt occures because of arbitration lost it might mean something or simply core bug i don't know.
Altera_Forum
Honored Contributor I
30 Views

Usually, the read/write depends on the last bit, so should be 0x40/0x41?