Git-Mirrors/tillitis-key
1
0
Fork 0
mirror of https://github.com/tillitis/tillitis-key1.git synced 2025-11-28 11:21:45 -05:00
Code Issues Projects Releases Packages Wiki Activity

PoC: PicoRV32 interrupts

Browse source 
A proof-of-concept of enabling PicoRV32 interrupts. Two interrupt
sources, which can be triggered by writes to memory addresses, are
added.  The design has only been simulated, not run on hardware.

Synthesis:

Ice40 LC utilization is 93% (4934/5280) when built using tkey-builder:4

Simulation:

A `tb_application_fpga_irqpoc` target is added. Running `make
tb_application_fpga_irqpoc` creates `tb_application_fpga_sim.fst` which
can be inspected in GTKWave or Surfer.

Firmware:

A simple firmware is added in `fw/irqpoc`. It enables both interrupts
and triggers each interrupt once.

Custom PicoRV32 instructions are located in `custom_ops.S`. It is
imported from upstream PicoRV32 commit:
70f3c33ac8
This commit is contained in:
Mikael Ågren 2024-12-03 17:33:59 +01:00
parent d2c7fb0ba9
commit 5e15b40a86
No known key found for this signature in database
GPG key ID: E02DA3D397792C46
10 changed files with 363 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

10
hw/application_fpga/fw/irqpoc/main.c Normal file
View file

@ -0,0 +1,10 @@
/*
* Copyright (C) 2022, 2023 - Tillitis AB
* SPDX-License-Identifier: GPL-2.0-only
*/
int main(void)
{
while (1) {
}
}