About tilolutz

tilolutz · 2012-05-28

Posted on May 28, 2012 at 10:30Hi I want to connect a PCM3168a audio codec to a STM32F407VG (Discovery board). The problem is the Codec is only alive when MCK is provided. Without MCK the control interface (i2c) is dead. Is use SPI3 in I2S mode for ...

tilolutz · 2012-05-31

Posted on May 31, 2012 at 20:15Hi You're right. I have understand the PLL wrong. I thought the PLL frequency is the frequency which is used as clock in I2S. I haven't recognized the divider after the PLL. Now it seems to work, thank you.

tilolutz · 2012-05-29

Posted on May 29, 2012 at 18:52Update: When I set the divider at least to RCC_MCO2Div_2 amplitude is OK. So PLLI2S should be configured correct. Hm, any ideas?

tilolutz · 2012-05-28

Posted on May 28, 2012 at 22:26 Unfortunatly it is not working. I have configured PC9: GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct...

tilolutz · 2012-05-28

Posted on May 28, 2012 at 21:03A circular DMA was my first idea but I would prefer using the MCO because this solution will cost less resources. The manual of the codec tells phase between MCK and CK is not important. Only the ratio must fit. I thin...

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