ardupilot/libraries/AP_HAL_PX4/examples/simple/simple.cpp

/*
  simple hello world sketch
  Andrew Tridgell September 2011
*/

#include <AP_HAL/AP_HAL.h>

void setup();
void loop();

const AP_HAL::HAL& hal = AP_HAL::get_HAL();

void setup() {
    hal.console->printf("hello world\n");
}

void loop()
{
    hal.scheduler->delay(1000);
    hal.console->printf("*\n");
}

AP_HAL_MAIN();
HAL_PX4: update simple example 2013-01-02 22:17:32 -04:00			`/*`
			`simple hello world sketch`
			`Andrew Tridgell September 2011`
			`*/`
AP_HAL_PX4: trivial console header 2012-10-27 02:18:51 -03:00
AP_HAL_PX4: standardize inclusion of libaries headers This commit changes the way libraries headers are included in source files: - If the header is in the same directory the source belongs to, so the notation '#include ""' is used with the path relative to the directory containing the source. - If the header is outside the directory containing the source, then we use the notation '#include <>' with the path relative to libraries folder. Some of the advantages of such approach: - Only one search path for libraries headers. - OSs like Windows may have a better lookup time. 2015-08-11 03:28:43 -03:00			`#include <AP_HAL/AP_HAL.h>`
AP_HAL_PX4: trivial console header 2012-10-27 02:18:51 -03:00
AP_HAL_PX4: example fix travis warning missing function declaration implicit cast some style fix 2017-04-13 08:31:40 -03:00			`void setup();`
			`void loop();`

AP_HAL: make code not depend on concrete HAL implementations The switching between different AP_HAL was happening by giving different definitions of AP_HAL_BOARD_DRIVER, and the programs would use it to instantiate. A program or library code would have to explicitly include (and depend) on the concrete implementation of the HAL, even when using it only via interface. The proposed change move this dependency to be link time. There is a AP_HAL::get_HAL() function that is used by the client code. Each implementation of HAL provides its own definition of this function, returning the appropriate concrete instance. Since this replaces the job of AP_HAL_BOARD_DRIVER, the definition was removed. The static variables for PX4 and VRBRAIN were named differently to avoid shadowing the extern symbol 'hal'. 2015-10-16 17:22:11 -03:00			`const AP_HAL::HAL& hal = AP_HAL::get_HAL();`
AP_HAL_PX4: trivial console header 2012-10-27 02:18:51 -03:00
HAL_PX4: update simple example 2013-01-02 22:17:32 -04:00			`void setup() {`
AP_HAL_PX4: example fix travis warning missing function declaration implicit cast some style fix 2017-04-13 08:31:40 -03:00			`hal.console->printf("hello world\n");`
AP_HAL_PX4: trivial console header 2012-10-27 02:18:51 -03:00			`}`

HAL_PX4: update simple example 2013-01-02 22:17:32 -04:00			`void loop()`
			`{`
AP_HAL_PX4: example fix travis warning missing function declaration implicit cast some style fix 2017-04-13 08:31:40 -03:00			`hal.scheduler->delay(1000);`
			`hal.console->printf("*\n");`
AP_HAL_PX4: trivial console header 2012-10-27 02:18:51 -03:00			`}`

HAL_PX4: update simple example 2013-01-02 22:17:32 -04:00			`AP_HAL_MAIN();`