MDK-ARM Keil, MDK-ARM Datasheet - Page 42

• Manufacturer Part Number: MDK-ARM
• Description: KIT REALVIEW MCU DEVELOPMENT
• Manufacturer: Keil
• Type: Compiler and IDEr

Specifications of MDK-ARM

• For Use With/related Products: ARM MCUs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

42
A task sending a message:
__task void Send_Task (void)
}
A task to receive the message:
__task void Receive_Task (void)
}
Exercise: Mailbox
This exercise presents the minimum code to initialize a mailbox and then pass a
formatted message between two tasks.
…
MESSAGE *mptr;
os_mbx_init (MsgBox, sizeof (MsgBox));
tsk1 = os_tsk_self ();
tsk2 = os_tsk_create (Receive_Task, 0x1);
while (1)
…
}
…
MESSAGE *rptr;
while (1) {
}
mptr = _alloc_box (mpool);
for (i=0; i < 4 ; i++)
}
os_mbx_send (MsgBox, mptr, 0xffff);
os_mbx_wait (MsgBox, &rptr, 0xffff);
pwm_value = *rptr->ADresult [0];
_free_box (mpool, rptr);
…
Mptr->ADresult [i] = ADresult (i);
Mptr->PORT0 = IOPIN0;
{
{
{
{
// Wait for a message arrives
// Read the message data
// Free the mail slot
// Use the data in this task
Chapter 2. Developing With an RTOS
// Acquire a mailbox
// Fill it with data
// Send the message