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Altera_Forum's avatar
Altera_Forum
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14 years ago

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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  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    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's avatar
    Altera_Forum
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    14 years ago

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