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 variable.
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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