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I2s USART conflict??

Question asked by DocCC on May 13, 2013
Latest reply on May 14, 2013 by DocCC
I am successfully using I2C control and I2S to send data to the CS43L22 and producing simple sawtooth--> musical notes(see http://www.mind-dump.net/configuring-the-stm32f4-discovery-for-audio#comment-1344).
When I try to use USART3(interrupt) using Arduino serial monitor with Arduino/Software Serial to send character to change musical note I get no sound. I've avoided using pins assigned to the I2's, and can toggle LED's and echo characters both demonstrating successful communication and 'understanding' of the character data I'm sending, but not sound.
Is there some inherent conflict possible?

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