I purchased 2 Raspberry Pico 2W. To try the RISCs.
The 3 things that I want to get going first:
debug session on 1 RISC with PicoProbe FreeRTOS SMP running on the 2 RISCS use 3 PIOs (I used the 3rd pio with the stepper motor design I made earlier)
customer action photo: Pico 2W on a pico-eurocard
customer action photo: Pico 2W runs 10 stepper motors on 3 PIOs
so it works when I build for the ARM cores on the Pico 2:
At least I know now that the debugger works, openocd works, and that the Pico 2 works.
I did a first little assembler test - code suggested by chatGPT: How to check if a RISCV core is used:
bool is_riscv(void) {
uint32_t misa;
// Try to read RISC-V misa register
// Only valid on RISC-V. Undefined on ARM.
__asm__ volatile (
"csrr %0, misa"
: "=r"(misa)
:
: // No clobbers
);
// misa should have non-zero value if this is a RISC-V core
return misa != 0;
}
if (is_riscv()) {
uart_puts(UART_ID, "on riscv\n");
}
Some more progress. Goal 2 unlocked:
FreeRTOS executing tasks on the two riscv cores:
I ran out of pcb headers for these boards. I went a bit fancy :).
I use a silver paint pen at the moment to mark particular boards or pins. Maybe I should invest in a set of different colours. And paint the trusted black headers.
