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IODevice.cpp: Fix error in overlap checking.

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The checkNoOverlap() function didn't work correctly in the case where one device has nPins=0.  All devices configured after that were rejected, even when no overlap was present.
This commit is contained in:
Neil McKechnie 2023-01-16 23:03:53 +00:00
parent abf62dfd85
commit ccf463b507
1 changed files with 11 additions and 10 deletions
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3
IODevice.cpp
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@ -292,6 +292,7 @@ bool IODevice::checkNoOverlap(VPIN firstPin, uint8_t nPins, uint8_t i2cAddress)
VPIN lastPin=firstPin+nPins-1; VPIN lastPin=firstPin+nPins-1;
for (IODevice *dev = _firstDevice; dev != 0; dev = dev->_nextDevice) { for (IODevice *dev = _firstDevice; dev != 0; dev = dev->_nextDevice) {
if (nPins > 0 && dev->_nPins > 0) {
// check for pin range overlaps (verbose but compiler will fix that) // check for pin range overlaps (verbose but compiler will fix that)
VPIN firstDevPin=dev->_firstVpin; VPIN firstDevPin=dev->_firstVpin;
VPIN lastDevPin=firstDevPin+dev->_nPins-1; VPIN lastDevPin=firstDevPin+dev->_nPins-1;
@ -301,7 +302,7 @@ bool IODevice::checkNoOverlap(VPIN firstPin, uint8_t nPins, uint8_t i2cAddress)
firstPin, lastPin); firstPin, lastPin);
return false; return false;
} }
}
// Check for overlapping I2C address // Check for overlapping I2C address
if (i2cAddress && dev->_I2CAddress==i2cAddress) { if (i2cAddress && dev->_I2CAddress==i2cAddress) {
DIAG(F("WARNING HAL Overlap. i2c Addr 0x%x ignored."),i2cAddress); DIAG(F("WARNING HAL Overlap. i2c Addr 0x%x ignored."),i2cAddress);