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Fixed bug with AVR8 output pin manipulation where GPIO CLEAR registers were not being set correctly.

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When the GPIO CLEAR register is not the same as the SET register, there is
no need to read the value before setting the appropriate bit on the
CLEAR register. We were reading the value and *then* setting the
appropriate bit. The value we were reading had previous bits set (from previous
clear operations, I suspect), which we were not clearing (before
setting the appropriate bits). This was resulting in other GPIO pins
on the same PORT being cleared unexpectedly. Doh!
This commit is contained in:
Nav
2021-07-17 01:57:13 +01:00
parent 86134fead1
commit 41c98bc5ba
1 changed files with 32 additions and 28 deletions
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28
src/Targets/Microchip/AVR/AVR8/Avr8.cpp
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@@ -447,6 +447,20 @@ void Avr8::setPinState(int variantId, const TargetPinDescriptor& pinDescriptor,
|| !padDescriptor.gpioPortClearAddress.has_value()
|| padDescriptor.gpioPortClearAddress == portSetAddress
) {
if (padDescriptor.gpioPortClearAddress != portSetAddress) {
/*
* We don't need to read the register if the SET and CLEAR operations are performed via different
* registers.
*
* Instead, we can just set the appropriate bit against the SET register.
*/
this->writeMemory(
TargetMemoryType::RAM,
portSetAddress,
{static_cast<unsigned char>(0x01 << pinNumber)}
);
} else {
auto portSetRegisterValue = this->readMemory(TargetMemoryType::RAM, portSetAddress, 1);
if (portSetRegisterValue.empty()) {
@@ -465,6 +479,7 @@ void Avr8::setPinState(int variantId, const TargetPinDescriptor& pinDescriptor,
);
}
}
}
/*
* We only need to update the PORT clear register if the IO state was set to LOW, and the clear register is
@@ -476,26 +491,15 @@ void Avr8::setPinState(int variantId, const TargetPinDescriptor& pinDescriptor,
) {
// We also need to ensure the PORT clear register value is correct
auto portClearAddress = padDescriptor.gpioPortClearAddress.value();
auto portClearRegisterValue = this->readMemory(TargetMemoryType::RAM, portClearAddress, 1);
if (portClearRegisterValue.empty()) {
throw Exception("Failed to read PORT (OUTSET) register value");
}
auto portClearBitset = std::bitset<std::numeric_limits<unsigned char>::digits>(portClearRegisterValue.front());
if (portClearBitset.test(pinNumber) == (ioState == TargetPinState::IoState::LOW)) {
// PORT clear register needs updating
portClearBitset.set(pinNumber, (ioState == TargetPinState::IoState::LOW));
this->writeMemory(
TargetMemoryType::RAM,
portClearAddress,
{static_cast<unsigned char>(portClearBitset.to_ulong())}
{static_cast<unsigned char>(0x01 << pinNumber)}
);
}
}
}
}
bool Avr8::memoryAddressRangeClashesWithIoPortRegisters(
TargetMemoryType memoryType,