DirectC facilitates in-system embedded programming of Microchip FPGAs using an integrated or external microprocessor (MPU) that contains either JTAG-DirectC or SPI-DirectC.  These methods use direct and indirect memory access to complete the programming. JTAG-DirectC supports PolarFire® SoC, PolarFire, IGLOO® 2,  SmartFusion® 2, RTG4™, ProASIC® 3, IGLOO ,  SmartFusion® and Fusion devices. SPI-DirectC supports PolarFire SoC, PolarFire, IGLOO 2 and SmartFusion 2 devices.

The source code integrates JTAG-DirectC and SPI-DirectC by adding the necessary Application Programming Interface (API) calls and compiling the modified source code to create a binary executable. The binary executable is downloaded onto the system along with the programming data file.