C2000WARE: Testing the AD7847 with the TMDSCNCD280049C

Hi Kotaro,

We don’t have an example specifically for the AD7847, but you can build this test by combining the standard ADC and GPIO examples from C2000Ware for F28004x.You can install the latest C2000Ware and make sure CCS can see it under “Window > Preferences > Code Composer Studio > Products”. In CCS, use Project > Import CCS Projects… and browse into “C2000Ware\driverlib\f28004x\examples\adc”. For example, import and build “adc_ex1_soc_software” as a starting point. That gives you a working CCS project with clocks, linker command file, and basic device init for TMDSCNCD280049C on TMDSHSECDOCK.

Select the ADC channel that corresponds to the ADC_IN pin you are using on the controlCARD/HSEC dock and modify “initADCs()”. Make sure to trigger the conversion (software or ePWM) and confirm you can read the correct value in AdcaResultRegs.ADCRESULTx.

The AD7847 expects a 12-bit parallel bus plus control signals (CS, WR). Choose the GPIO pins like 12 data bits: (GPIO0–GPIO11) and control lines: (GPIO12 > CS, GPIO13 > WR) and configure them as output.

After you read adcResult = AdcaResultRegs.ADCRESULT0, align to the AD7847’s data width (12-bit):

uint16_t dacData = adcResult & 0x0FFF;

Finally, drive each GPIO bit.

You can first do this in a simple for(;;) loop (no interrupts) to validate the interface, then later move it into an ADC ISR if you need continuous streaming.

Best Regards,

Masoud