0 Replies Latest reply on Jan 14, 2010 6:30 AM by nicola.horsburgh

    CSDADC causes I2C to fail

    nicola.horsburgh
              I have a CY8C24894 PSoC configured with CSDADC and I2CHW slave modules. The aim is to get the touch positions to an external processor via I2C.   
         
      For debug purposes I have commented out all the capsense code. When doing I2C echoes to the master processor without starting the CSDADC, I get a 100% success rate. But when the CSDADC module is started the I2C fails completely. Viewing the I2C lines on a scope shows that when it fails the PSoC does not even give an ACK to the master's address byte. The only difference between the working and non-working projects is the calling of function CSD_Start().   
         
      The selection option for CSDADC is "CSDADC with PWM8 clock source". I have attached the project.