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Fixed bug with DWEN fuse bit management, where the newly written value

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was being read back too quickly after the write, resulting in garbage data (0xFF)
being returned. Removal of the default (35 millisecond) CMSIS command delay
is what revealed this issue.
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2025-02-22 22:23:53 +00:00
parent 7bbd856c35
commit a53a8c87f0
1 changed files with 17 additions and 4 deletions
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21
src/Targets/Microchip/Avr8/Avr8.cpp
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@@ -890,6 +890,8 @@ namespace Targets::Microchip::Avr8
}
void Avr8::updateDwenFuseBit(bool enable) {
using Services::StringService;
if (this->avrIspInterface == nullptr) {
throw Exception{
"Debug tool or driver does not provide access to an ISP interface - please confirm that the "
@@ -1027,23 +1029,34 @@ namespace Targets::Microchip::Avr8
Logger::info("Cleared lock bits confirmed");
Logger::debug("DWEN fuse byte value (before update): 0x" + StringService::toHex(dwenFuseByte));
const auto newFuseValue = this->setFuseEnabled(dwenBitFieldDescriptor, dwenFuseByte, enable);
Logger::debug("New DWEN fuse byte value (to be written): 0x" + StringService::toHex(newFuseValue));
Logger::warning("Updating DWEN fuse bit");
this->avrIspInterface->programFuse(dwenRegisterDescriptor, newFuseValue);
Logger::debug("Verifying DWEN fuse bit");
if (this->avrIspInterface->readFuse(dwenRegisterDescriptor) != newFuseValue) {
throw Exception{"Failed to update DWEN fuse bit - post-update verification failed"};
// If we read back the newly-written value too quickly after writing, we get garbage data
std::this_thread::sleep_for(std::chrono::milliseconds{50});
const auto writtenValue = this->avrIspInterface->readFuse(dwenRegisterDescriptor);
if (writtenValue != newFuseValue) {
throw Exception{
"Failed to update DWEN fuse bit - post-update verification failed (value read: 0x"
+ StringService::toHex(writtenValue) + ")"
};
}
Logger::info("DWEN fuse bit successfully updated");
this->avrIspInterface->deactivate();
} catch (const Exception& exception) {
} catch (const Exception&) {
this->avrIspInterface->deactivate();
throw exception;
throw;
}
}