Give a child a robot, he'll play for an hour. Teach him to build, and he'll play forever.
https://mindboards.org:443/
-TimNXC Guide wrote:In NXC the mutex type is a 32-bit value that is used to synchronize access to resources shared across multiple threads.
For this reason there is never a reason to declare a mutex variable inside a task or a function. It is designed for global variables that all tasks or functions can Acquire or Release in order to obtain exclusive access to a resource that other tasks or functions are also trying to use
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mutex motorMutex; task t1() { while (true) { Acquire(motorMutex); // use the motor(s) protected by this mutex. Release(motorMutex); Wait(MS_500); } } task t2() { while (true) { Acquire(motorMutex); // use the motor(s) protected by this mutex. Release(motorMutex); Wait(MS_200); } } task main() { Precedes(t1, t2); }
Yes, as Matt said, you can do this:mattallen37 wrote:You want to have a variable that can be accessed by all tasks? Just use global variables, not local.
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int g_iCharVal; // declare global variable (that will store the value of the current ASCII character position)
// Displays stuff!
task display()
{
string cOut; // lol :) Technically, it should be szOut, but I like messing things up
while(1)
{
// Convert g_iCharVal to string and store in cOut
cOut = FlattenVar(g_iCharVal);
// Display information on screen
ClearScreen();
NumOut(0, LCD_LINE1, g_iCharVal, 0);
TextOut(0, LCD_LINE2, cOut, 0);
}
}
// Changes the variable according to user input
task change()
{
while(1)
{
if(ButtonPressed(BTNLEFT, 0))
g_iCharVal--;
if(ButtonPressed(BTNRIGHT, 0))
g_iCharVal++;
if(g_iCharVal < 0x20) // 0x20 == ' '
g_iCharVal = 0x7F;
if(g_iCharVal > 0x7F) // 0x7F == '!', IIRC
g_iCharVal = 0x20;
}
}
task main()
{
g_iCharVal = 0x20;
// start other 2 tasks
Precedes(display, change);
// doNotUse = 4; // ERROR!
}
int doNotUse = 3;