[DigiKey "Smart Manufacturing, Non-stop Happiness" Creative Competition] bbb RMP (Red Magic Probe) stands up

iysheng

[DigiKey "Smart Manufacturing, Non-stop Happiness" Creative Competition] bbb RMP (Red Magic Probe) stands up [Copy link]

#### bbb RMP (Red Magic Probe) has stood up. Haha, after a few days of debugging, mainly asking for advice in the upstream community group blackmagic, the problem of not being able to download programs through the load command has been solved. Now you can download programs to 32 through bbb RMP. Here is a screenshot of the successful download: 
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 I am happy. The following is a brief introduction to the solution process of this problem. 1. First, I opened the printing support. After the guidance of the big guys, I suspected that there was an error when I responded to gdb, not a problem with the gdb protocol stack (gdb is still relatively stable and reliable). In this direction, I rebased my program to synchronize with the upstream, because the maintainer ``dragonmux`` told me that my code was too old and the recent update fixed many bugs. I rebased to the latest code, and then gradually found that after gdb sent me the ``vFlashWrite`` command, I did not return a normal response. After debugging, I found that the package verification I received from gdb did not pass. Because the last two bytes of the gdb package are the checksum of the previous content. 2. After knowing the reason, the next question is, why does the gdb package I received fail the checksum? I just want to see if the data sent by gdb is consistent with what I received. At this time, I continue to ask the big guys how to view the content sent by gdb. The method is to enter ``set debug remote 1`` in gdb and start printing, so that you can compare. The data actually sent by gdb is as follows: 
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 You can see that the sender obviously sent the characters ``\r`` and ``\x0d``, but I did not find this character when I printed it on my side. The details are as follows: 
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<a href="javascript:;" class="loginf" >download attach</a>

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 Then I roughly know the problem and where it is. I added the following diff for the serial port configuration ``` diff diff --git a/src/gdb_packet.c b/src/gdb_packet.c index 6ab5307a..7aa688d8 100644 --- a/src/gdb_packet.c +++ b/src/gdb_packet.c @@ -117,6 +117,8 @@ packet_state_e consume_remote_packet(char *const packet, const size_t size) #endif } +// vFlashWrite:addr:XX... Write data XX to the specified addr flash address +// XX is binary data size_t gdb_getpacket(char *const packet, const size_t size) { packet_state_e state = PACKET_IDLE; /* State of the packet capture */ diff --git a/src/platforms/bbb/platform.cb/src/platforms/bbb/platform.c index 13493d74..8f6af07e 100644 --- a/src/platforms/bbb/platform.c +++ b/src/platforms/bbb/platform.c @@ -112,6 +112,8 @@ static bool set_interface_attribs(void) // disable IGNBRK for mismatched speed tests; otherwise receive break // as \000 chars tty.c_iflag &= ~IGNBRK; // disable break processing + tty.c_iflag &= ~ICRNL; // 取消0d -> 0a 转换+ tty.c_iflag &= ~IXON; tty.c_lflag = 0; // no signaling chars, no echo, // no canonical processing tty.c_oflag = 0; // no remapping, no delays ``` Then the problem was solved smoothly. Attached is the link of my code repository: [https://github.com/iysheng/blackmagic/tree/bbb](https://github.com/iysheng/blackmagic/tree/bbb) I would like to express my sincere gratitude to the community partners who helped me solve this problem in the past few days. The community is very good and nice.

HonestQiao

The spirit of research is worth learning!

If gdb is used properly, it can be of great help to development work!

iysheng

HonestQiao posted on 2024-1-11 08:14 The spirit of research is worth learning! If gdb is used well, it can be of great help to development work!

Because it was a competition, I wanted to do better. The process was a bit tiring, but fortunately the problem could be solved. I felt like I had suddenly realized something.

HonestQiao

iysheng posted on 2024-1-11 09:23 Because it is a competition, I want to do better. This process is a bit tiring, but fortunately the problem can be solved. There is a feeling of sudden enlightenment.

This is the effect that research aims to achieve.

Once you get through the painful process, you will reap happiness!

[DigiKey "Smart Manufacturing, Non-stop Happiness" Creative Competition] bbb RMP (Red Magic Probe) stands up [Copy link]

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