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In TX_START mode, a lack of data to send is not treated as a shortfall. Zeroes are written to SGPIO, but no shortfall is recorded in the stats. Using this mode helps avoid spurious shortfalls at startup. As soon as there is data to transmit, the M0 switches to TX_RUN mode. This change adds five cycles to the normal TX path, in order to check for TX_START mode before sending data, and to switch to TX_RUN in that case. It also adds two cycles to the TX shortfall path, to check for TX_START mode and skip shortfall processing in that mode. Note the allocation of r3 to store the mode setting, such that this value is still available after the tx_zeros routine.
The primary firmware source code for USB HackRF devices is hackrf_usb. Most of the other directories contain firmware source code for test and development. The common directory contains source code shared by multiple HackRF firmware projects. The cpld directory contains HDL source for the CPLD. The firmware is set up for compilation with the GCC toolchain available here: https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads Required dependency: https://github.com/mossmann/libopencm3 If you are using git, the preferred way to install libopencm3 is to use the submodule: $ cd .. $ git submodule init $ git submodule update To build and install a standard firmware image for HackRF One: $ cd hackrf_usb $ mkdir build $ cd build $ cmake .. $ make $ hackrf_spiflash -w hackrf_usb.bin If you have a Jawbreaker, add -DBOARD=JAWBREAKER to the cmake command. If you have a rad1o, use -DBOARD=RAD1O instead. It is possible to use a USB Device Firmware Upgrade (DFU) method to load firmware into RAM. This is normally only required to recover a device that has had faulty firmware loaded, but it can also be useful for firmware developers. For loading firmware into RAM with DFU you will need: http://dfu-util.sourceforge.net/ To start up HackRF One in DFU mode, hold down the DFU button while powering it on or while pressing and releasing the RESET button. Release the DFU button after the 3V3 LED illuminates. A .dfu file is built by default when building firmware. Alternatively you can use a known good .dfu file from a release package. Load the firmware into RAM with: $ dfu-util --device 1fc9:000c --alt 0 --download hackrf_usb.dfu