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- README
- ======
- gapuino is an evaluation board for GAP8, a 1+8-core DSP-like RISC-V
- MCU. GAP8 features a RI5CY core called Fabric Controller(FC), and a
- cluster of 8 RI5CY cores that runs at a bit slower speed. GAP8 is an
- implementation of the opensource PULP platform, a Parallel-Ultra-Low-
- Power design.
- The port is currently very minimal, though additional support may be
- added in the future to address more of the board peripherals.
- Supported:
- - USB UART (console port)
- - uDMA on SOC domain
- - FLL clock scaling
- Not supported:
- - SPI, I2C, I2S, CPI, LVDS, Hyper-bus on the uDMA subsystem
- - the sensor board
- - the 8-core cluster
- - the Hardware convolution engine
- See also:
- gapuino board and the sensor board:
- https://gwt-website-files.s3.amazonaws.com/gapuino_um.pdf
- https://gwt-website-files.s3.amazonaws.com/gapuino_multisensor_um.pdf
- GAP8 datasheet:
- https://gwt-website-files.s3.amazonaws.com/gap8_datasheet.pdf
- Contents
- ========
- - Environment Setup
- - Configurations
- - Execute
- Environment Setup
- =================
- First, setup the gap_sdk from GreenwavesTechnologies' github repo.
- Follow the README to setup the toolchain and environment.
- https://github.com/GreenWaves-Technologies/gap_sdk/
- Configurations
- ==============
- Each gapuino configuration is maintained in a sub-directory and can
- be selected as follow:
- tools/configure.sh gapuino/<subdir>
- Where <subdir> is one of the following:
- nsh
- ---
- This is an NSH example that uses the UART connected to FT2232 as
- the console. Default UART settings are 115200, 8N1.
- Execute
- =======
- You may download the ELF to the board by `plpbridge` in gap_sdk.
- Remember to first `cd` to the gap_sdk/ and `source sourceme.sh`, so
- that you have the $GAP_SDK_HOME environment varible.
- Use the following command to download and run the ELF through JTAG:
- $GAP_SDK_HOME/install/workstation/bin/plpbridge \
- --cable=ftdi@digilent --boot-mode=jtag --chip=gap \
- --binary=nuttx \
- load ioloop reqloop start wait
- As for debugging, the following command download the ELF and opens
- a gdbserver on port 1234:
- $GAP_SDK_HOME/install/workstation/bin/plpbridge \
- --cable=ftdi@digilent --boot-mode=jtag --chip=gap \
- --binary=nuttx \
- load ioloop gdb wait
- And then launch the gdb on another terminal:
- riscv32-unknown-elf-gdb nuttx
- ...
- (gdb) target remote :1234
- Remote debugging using :1234
- IRQ_U_Vector_Base () at chip/startup_gap8.S:293
- 293 j reset_handler /* 32 */
- (gdb)
- And then enjoy yourself debugging with the CLI gdb :-)
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