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fix(ScanI2C): fetch the SE050 probe response with requestFrom() (#11133)

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Carlos Valdes
2026-07-23 09:57:14 +02:00
committed by GitHub
co-authored by GitHub
parent 8a9980576f
commit 2c1fd6b7ea
1 changed files with 20 additions and 8 deletions
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src/detect/ScanI2CTwoWire.cpp
+20 -8
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@@ -905,15 +905,27 @@ void ScanI2CTwoWire::scanPort(I2CPort port, uint8_t *address, uint8_t asize)
break;
case 0x48: {
i2cBus->beginTransmission(addr.address);
uint8_t getInfo[] = {0x5A, 0xC0, 0x00, 0xFF, 0xFC};
uint8_t expectedInfo[] = {0xa5, 0xE0, 0x00, 0x3F, 0x19};
uint8_t info[5];
// T=1oI2C soft reset; an SE050 answers A5 E0 00 3F 19. requestFrom() is
// required: readBytes() only drains the RX buffer requestFrom() fills.
const uint8_t getInfo[] = {0x5A, 0xC0, 0x00, 0xFF, 0xFC};
const uint8_t expectedInfo[] = {0xA5, 0xE0, 0x00, 0x3F, 0x19};
uint8_t info[sizeof(expectedInfo)] = {0};
size_t len = 0;
i2cBus->write(getInfo, 5);
i2cBus->endTransmission();
len = i2cBus->readBytes(info, 5);
if (len == 5 && memcmp(expectedInfo, info, len) == 0) {
bool isSE050 = false;
i2cBus->beginTransmission(addr.address);
i2cBus->write(getInfo, sizeof(getInfo));
if (i2cBus->endTransmission() == 0) {
delay(2); // guard time before the answer can be read back
len = i2cBus->requestFrom((uint8_t)addr.address, (uint8_t)sizeof(info));
if (len == sizeof(info)) {
for (size_t i = 0; i < sizeof(info); i++)
info[i] = i2cBus->read();
isSE050 = (memcmp(expectedInfo, info, sizeof(info)) == 0);
}
}
if (isSE050) {
LOG_INFO("NXP SE050 crypto chip found");
type = NXP_SE050;
break;