Difficulties to follow the IceStick Tutorial. about learn-fpga

[BrunoLevy]

It's because I am stupid !
I forgot to push this file,
Now normally it is fixed,
Would you try again and tell me what it gives ?
Thanks in advance,
-- B

[at91rm9200]

Thank you very much. It works perfectly now.

Regards, Bernd.

[at91rm9200]

Hello Bruno,

sorry to bother you again. I am not able to see any UART output in the terminal.

Executing make ICESTICK in FemtoRV directory works without errors, iceprog is successfully programming femtosoc.bin. But there is no output in the terminal.

make blinker_loop.prog in the ASM_EXAMPLES directory works as expected. I can see the LEDs blink.

Make hello.prog in the EXAMPLES directory seems not to produce any output in the terminal.

So I disabled/commented NRV_IO_SSD1351 and NRV_IO_MAX7219 in RTL/CONFIGS/icestick_config.v and run make ICESTICK again.

Now I get the following error message:

/home/bernd/fpga/mue/project/riscv/femtorv_2102/learn-fpga/FemtoRV/FIRMWARE//TOOLCHAIN/riscv64-unknown-elf-gcc-8.3.0-2020.04.0-x86_64-linux-ubuntu14/bin/riscv64-unknown-elf-gcc -Os -I/home/bernd/fpga/mue/project/riscv/femtorv_2102/learn-fpga/FemtoRV/FIRMWARE//LIBFEMTOGL -I/home/bernd/fpga/mue/project/riscv/femtorv_2102/learn-fpga/FemtoRV/FIRMWARE//LIBFEMTORV32 -I/home/bernd/fpga/mue/project/riscv/femtorv_2102/learn-fpga/FemtoRV/FIRMWARE//LIBFEMTOC -DICE_STICK=1 -fno-pic -march=rv32i -mabi=ilp32 -fno-stack-protector -w -Wl,--no-relax -c femtoGL.c
femtoGL.c: In function 'GL_init':
femtoGL.c:62:16: error: 'OLED_WIDTH' undeclared (first use in this function)
GL_width = OLED_WIDTH;
^~~~~~~~~~
femtoGL.c:62:16: note: each undeclared identifier is reported only once for each function it appears in
femtoGL.c:63:16: error: 'OLED_HEIGHT' undeclared (first use in this function)
GL_height = OLED_HEIGHT;
^~~~~~~~~~~
../makefile.inc:72: recipe for target 'femtoGL.o' failed
make[2]: *** [femtoGL.o] Error 1

I am unsure now, if NRV_IO_SSD1351 and NRV_IO_MAX7219 should be disabled or not.

Regards, Bernd.

[at91rm9200]

I found a workaround: I added

#if !defined(SSD1351) || !defined(SSD1331)
#define OLED_WIDTH 1
#define OLED_HEIGHT 1
#endif

in femtorv32h, line 112 to get femtoGL compiled with NRV_IO_SSD1351 and NRV_IO_MAX7219 disabled.
And now I can see the UART messages in the terminal :-)

Regards, Bernd.

[BrunoLevy]

Hi,
There is an easier way:
You can edit RTL/CONFIGS/icestick_config.v and comment-out all the devices you are not using
(NRV_IO_SSD1351, NRV_IO_MAX7219), then the firware detects it and sends all outputs to the UART.

I'll make it clearer in the tutorial.

Best wishes,
-- B

[at91rm9200]

yes, I tried to comment-out NRV_IO_SSD1351 and NRV_IO_MAX7219. But compiling the firmware fails then with the error, I mentioned above:
femtoGL.c: In function 'GL_init':
femtoGL.c:62:16: error: 'OLED_WIDTH' undeclared (first use in this function)
GL_width = OLED_WIDTH;

Anyway, I thank you for this fantastic project and close this issue now.
Regards, Bernd.

[BrunoLevy]

You are perfectly right.
I have pushed your suggested fix, thank you very much !
-- B