Amazon FreeRTOS on HiFive RevB

HiFive1 Rev B
1

Hi, I tried to run an example of amazon freertos on hifive rev B board, the source code from here (https://github.com/sifive/Amazon-FreeRTOS)

I have built successfully aws_demo and aws_test projects by Freedom Studio. However I get some errors when try to download and run program.

The debugger showed that it was trapped in an infinite loop in file entry.S

/* For sanity's sake we set up an early trap vector that just does nothing.  If
 * you end up here then there's a bug in the early boot code somewhere. */
.section .text.metal.init.trapvec
.align 2
early_trap_vector:
    .cfi_startproc
    csrr t0, mcause
    csrr t1, mepc
    csrr t2, mtval
    j early_trap_vector
    .cfi_endproc

In think the issue is in the Debug Configuration.

2

The repository above is targeting learn inventor board (although hifive1 is mentioned in the repo)

3

Thanks for replying. Can it be used for Hifive1. How to solve my issue

4

The HiFive1, HiFive1 RevB, and Learn Inventor boards aren’t compatible with each other. The AWS freeRTOS port is just for the Learn Inventor board as far as I know.

But there is a HiFive1 RevB freeRTOS port upstream.


I don’t have a HiFive1 RevB board, so I’ve never tried it and can’t answer questions about it.

5

I had used demo project of FreeRTOS for HiFive1 RevB before and it worked well. Then to communicate with AWS, I used POST and GET methods.
In posted this question to know if I could use Amazon-FreeRTOS for my HiFive1 RevB

1 Like
6

Hello @TaLucGiaHoang

I found your repository here. Is this the demo project you were talking about?

I tried running it on my system, but for some reason I cannot get SPI to work when using the JTAG in debug mode. I do not think anything is coming across the the ESP.

7

I got it to work. For some reason, when running in Freedom Studio debug mode, no SPI/AT commands go out the the ESP. I took the elf file from Freedom Studio, converted it to hex using objcopy in Ubuntu, then uploaded to the hifive board using the USB drag and drop feature.

8

Hi @lfolkerts
You can watch my video here.

I found your repository here. Is this the demo project you were talking about?
I tried running it on my system, but for some reason I cannot get SPI to work when using the JTAG in debug mode. I do not think anything is coming across the the ESP.

  • Yes, that repo is used for my video.
  • I used Freedom Studio to build and download binary. To run this FreeRTOS demo you need to disconnect debugger, press reset button and use a UART terminal to get the log.

I got it to work. For some reason, when running in Freedom Studio debug mode, no SPI/AT commands go out the the ESP. I took the elf file from Freedom Studio, converted it to hex using objcopy in Ubuntu, then uploaded to the hifive board using the USB drag and drop feature.

  • You cannot get AT command from SPI because my demo uses delay method of FreeRTOS API, that is different from SiFive delay API.

For details, in my drv_esp32.c file:

#define delay_ms(ms)    vTaskDelay( ( TickType_t )ms / portTICK_PERIOD_MS ) //delay ms