[SOLVED] inter-thread messaging problem with OS_PutMail

DamienF · November 29, 2023 at 12:09 AM

Hi, we're porting code from a CMSIS-RTOS environment to embOS ver 4 and are having trouble with inter-thread messaging.
We've put in place code to perform the same as the code example at this link, section "Code Example".
That code essentially demonstrates how two threads can send a mail message via osMailPut (Thread 1) to another (Thread 2) and intercept the message via osMailGet and act upon it.
Do you have a code snippet to do the same using embOS APIs, showing the complete workflow just like the link above?
All our attempts to do the exact same have failed so far, where OS_PutMail generates a runtime exception.
Thanks!
Damien.

SEGGER - Til · November 29, 2023 at 9:15 AM

Dear Damien,

do you already have an embOS license?
Why do you use embOS V4? The latest embOS version is 5.18.0.

Would it be possible to share your code? You don't need to publish it here, but you can also contact us directly:
https://www.segger.com/doc/UM01001_embOS.html#Support

A basic embOS mailbox sample application OS_Mailboxes.c can be found in every BSP in the embOS shipment:

Code

#define MAX_MSG_SIZE  (8)  // Max. number of bytes per message
#define MAX_MSG_NUM   (2)  // Max. number of messages per Mailbox




static OS_STACKPTR int StackHP[128], StackLP[128];  // Task stacks
static OS_TASK         TCBHP, TCBLP;                // Task control blocks
static OS_MAILBOX      MyMailbox;
static char            MyMailboxBuffer[MAX_MSG_SIZE * MAX_MSG_NUM];


static void HPTask(void) {
  char aData[MAX_MSG_SIZE];


  while (1) {
    OS_MAILBOX_GetBlocked(&MyMailbox, (void *)aData);
    OS_COM_SendString(aData);
  }
}


static void LPTask(void) {
  while (1) {
    OS_MAILBOX_PutBlocked(&MyMailbox, "\nHello\0");
    OS_MAILBOX_PutBlocked(&MyMailbox, "\nWorld!\0");
  }
}


int main(void) {
  OS_Init();    // Initialize embOS
  OS_InitHW();  // Initialize required hardware
  OS_TASK_CREATE(&TCBHP, "HP Task", 100, HPTask, StackHP);
  OS_TASK_CREATE(&TCBLP, "LP Task",  50, LPTask, StackLP);
  OS_MAILBOX_Create(&MyMailbox, MAX_MSG_SIZE, MAX_MSG_NUM, &MyMailboxBuffer);
  OS_COM_SendString("embOS OS_Mailbox example");
  OS_COM_SendString("\n\nDemonstrating message passing\n");
  OS_Start();   // Start embOS
  return 0;
}

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However, if necessary, I can also create a sample application like the CMSIS sample application.

Best regards,
Til

[SOLVED] inter-thread messaging problem with OS_PutMail

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