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AP_RangeFinder_LightWareI2C: Fix driver after I2CDevice conversion

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* Fix semaphore not being released in ::get_reading
* Simplify semaphore releasing logic
* Fix typo
This commit is contained in:
Murilo Belluzzo 2016-07-11 20:03:44 -03:00 committed by Lucas De Marchi
parent 49d1520850
commit 66fdfbb850
1 changed files with 12 additions and 15 deletions
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27
libraries/AP_RangeFinder/AP_RangeFinder_LightWareI2C.cpp
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@ -21,7 +21,7 @@
extern const AP_HAL::HAL& hal;
/*
The constructor also initialises the rangefinder. Note that this
The constructor also initializes the rangefinder. Note that this
constructor is not called until detect() returns true, so we
already know that we should setup the rangefinder
*/
@ -54,29 +54,26 @@ AP_RangeFinder_Backend *AP_RangeFinder_LightWareI2C::detect(RangeFinder &_ranger
// read - return last value measured by sensor
bool AP_RangeFinder_LightWareI2C::get_reading(uint16_t &reading_cm)
{
uint8_t buff[2];
if (ranger._address[state.instance] == 0) {
return false;
}
// exit immediately if we can't take the semaphore
if (!_dev->get_semaphore()->take(1)) {
return false;
}
if (ranger._address[state.instance] == 0) {
return false;
}
uint8_t buff[2];
// read the high and low byte distance registers
if (!_dev->read(buff, sizeof(buff))) {
_dev->get_semaphore()->give();
return false;
bool ret = _dev->read(buff, sizeof(buff));
if (ret) {
// combine results into distance
reading_cm = ((uint16_t)buff[0]) << 8 | buff[1];
}
// combine results into distance
reading_cm = ((uint16_t)buff[0]) << 8 | buff[1];
// return semaphore
_dev->get_semaphore()->give();
return true;
return ret;
}
/*