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Repeated invocation of function "void sleep_us(uint64_t us)" can cause lockup #195

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opened 2021-02-27 05:26:06 -06:00 by ascotraces · 13 comments

ascotraces commented

2021-02-27 05:26:06 -06:00

(Migrated from github.com)

The attached code based on SDK C/C++ examples code test.c and built under Window10 demonstrates the problem:
test.zip

#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/gpio.h"
#include "pico/binary_info.h"

const uint LED_PIN = 25;

int main() {

stdio_init_all();

gpio_init(LED_PIN);
gpio_set_dir(LED_PIN, GPIO_OUT);
while (1) {
gpio_put(LED_PIN, 0);
sleep_ms(250);
gpio_put(LED_PIN, 1);
puts("Hello World\n");
sleep_ms(250);

  // invocation of function "void sleep_us(uint64_t us)"
  // when the number of microseconds to sleep (parameter "us") value
  // is set to 9 program lockup occurs, values of 8 and 10 are OK
  sleep_us(9);

}
}

The attached code based on SDK C/C++ examples code test.c and built under Window10 demonstrates the problem: [test.zip](https://github.com/raspberrypi/pico-sdk/files/6054267/test.zip) #include <stdio.h> #include "pico/stdlib.h" #include "hardware/gpio.h" #include "pico/binary_info.h" const uint LED_PIN = 25; int main() { stdio_init_all(); gpio_init(LED_PIN); gpio_set_dir(LED_PIN, GPIO_OUT); while (1) { gpio_put(LED_PIN, 0); sleep_ms(250); gpio_put(LED_PIN, 1); puts("Hello World\n"); sleep_ms(250); // invocation of function "void sleep_us(uint64_t us)" // when the number of microseconds to sleep (parameter "us") value // is set to 9 program lockup occurs, values of 8 and 10 are OK sleep_us(9); } }

kilograham commented

2021-02-27 12:07:07 -06:00

(Migrated from github.com)

attach a UF2

ascotraces commented

2021-02-27 14:03:15 -06:00

(Migrated from github.com)

UF2 attached
test-uf2.zip

UF2 attached [test-uf2.zip](https://github.com/raspberrypi/pico-sdk/files/6055283/test-uf2.zip)

ascotraces commented

2021-02-27 14:19:30 -06:00

(Migrated from github.com)

Developer Command Prompt for VS2019.txt

[Developer Command Prompt for VS2019.txt](https://github.com/raspberrypi/pico-sdk/files/6055317/Developer.Command.Prompt.for.VS2019.txt)

kilograham commented

2021-02-27 18:41:24 -06:00

(Migrated from github.com)

I can see your UF2 hang; sadly i should really have asked for the ELF, but:

Can you tell me output of:

From your pico-sdk and pico-examples directories:

git log -n 1

Can you send me the ELF that is built, and ideally see if you can reproduce it in debug mode (not sure if you are using VS Code, or cmd line, but you want to add -DCMAKE_BUILD_TYPE=Debug to your initial build setup)

Let me know if a debug build is broken too, if so send me the ELF for that as well

Finally, include the cmake output when starting from a clean/fresh build directory

I can see your UF2 hang; sadly i should really have asked for the ELF, but: Can you tell me output of: From your pico-sdk and pico-examples directories: ``` git log -n 1 ``` Can you send me the ELF that is built, and ideally see if you can reproduce it in debug mode (not sure if you are using VS Code, or cmd line, but you want to add -DCMAKE_BUILD_TYPE=Debug to your initial build setup) Let me know if a debug build is broken too, if so send me the ELF for that as well Finally, include the cmake output when starting from a clean/fresh build directory

ascotraces commented

2021-02-28 09:49:33 -06:00

(Migrated from github.com)

Git logs, ELF and CMake output for both the original build and a clean build in GitLogsAndtestELF.zip. The clean build also reproduced the hang problem.
test-uf2.zip

The debug build using -DCMAKE_BUILD_TYPE=Debug works fine. The resultant test.uf2 loads and executes correctly. I have enclosed the ELF and CMake output for information purposes, see file test-debug.zip.
test-uf2.zip

Git logs, ELF and CMake output for both the original build and a clean build in GitLogsAndtestELF.zip. The clean build also reproduced the hang problem. [test-uf2.zip](https://github.com/raspberrypi/pico-sdk/files/6057019/test-uf2.zip) The debug build using -DCMAKE_BUILD_TYPE=Debug works fine. The resultant test.uf2 loads and executes correctly. I have enclosed the ELF and CMake output for information purposes, see file test-debug.zip. [test-uf2.zip](https://github.com/raspberrypi/pico-sdk/files/6057039/test-uf2.zip)

ascotraces commented

2021-02-28 10:04:52 -06:00

(Migrated from github.com)

GitLogsAndtestELF.zip
test-debug.zip

Ignore the test-uf2.zip files attached in the previous comment. The correct GitLogsAndtestELF.zip and test-debug.zip files are attached to this comment.

[GitLogsAndtestELF.zip](https://github.com/raspberrypi/pico-sdk/files/6057074/GitLogsAndtestELF.zip) [test-debug.zip](https://github.com/raspberrypi/pico-sdk/files/6057101/test-debug.zip) Ignore the test-uf2.zip files attached in the previous comment. The correct GitLogsAndtestELF.zip and test-debug.zip files are attached to this comment.

lurch commented

2021-02-28 10:37:12 -06:00

(Migrated from github.com)

Would you mind trying the same thing with the develop branch of pico-sdk, to see if that still has the same problem?

Would you mind trying the same thing with the `develop` branch of pico-sdk, to see if that still has the same problem?

kilograham commented

2021-02-28 11:17:02 -06:00

(Migrated from github.com)

ah, useful information would be that you are using stdio_usb!

kilograham commented

2021-02-28 11:19:48 -06:00

(Migrated from github.com)

but i can now reproduce the problem (only with gcc 10.2.1)

kilograham commented

2021-02-28 11:22:40 -06:00

(Migrated from github.com)

and on the develop branch

👍 1

ascotraces commented

2021-02-28 13:25:33 -06:00

(Migrated from github.com)

I confirm:
a) That if I switch to the develop branch of pico-sdk, then I still have the same problem.
b) I am using gcc 10.2.1 20201103 (release).
c) I am using usb serial comms.

GitLogDevelop.zip

I confirm: a) That if I switch to the develop branch of pico-sdk, then I still have the same problem. b) I am using gcc 10.2.1 20201103 (release). c) I am using usb serial comms. [GitLogDevelop.zip](https://github.com/raspberrypi/pico-sdk/files/6057744/GitLogDevelop.zip)

lurch commented

2021-03-12 03:23:12 -06:00

(Migrated from github.com)