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I2C Scans for all! (S2 users having ESP_ERR_TIMEOUT: I2C Bus Busy) #710

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I2C Scans for all! (S2 users having ESP_ERR_TIMEOUT: I2C Bus Busy) #710

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21 changes: 18 additions & 3 deletions src/components/i2c/WipperSnapper_I2C.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -156,22 +156,37 @@ WipperSnapper_Component_I2C::scanAddresses() {

// Scan all I2C addresses between 0x08 and 0x7F inclusive and return a list of
// those that respond.
uint8_t addresses_failed_count = 0, current_failed_count = 0;
WS_DEBUG_PRINTLN("EXEC: I2C Scan");
for (address = 0x08; address < 0x7F; address++) {
start_scan:
current_failed_count = 0;
_i2c->beginTransmission(address);
endTransmissionRC = _i2c->endTransmission();

#if defined(ARDUINO_ARCH_ESP32)
// Check endTransmission()'s return code (Arduino-ESP32 ONLY)
// https://github.com/espressif/arduino-esp32/blob/master/libraries/Wire/src/Wire.cpp
if (endTransmissionRC == 5) {
WS_DEBUG_PRINTLN("ESP_ERR_TIMEOUT: I2C Bus Busy");
addresses_failed_count++;
current_failed_count++;
WS_DEBUG_PRINT("ESP_ERR_TIMEOUT: I2C Bus Busy - (Address: 0x");
WS_DEBUG_PRINT(address, HEX);
WS_DEBUG_PRINT(" - Error Count: ");
WS_DEBUG_PRINT(current_failed_count);
WS_DEBUG_PRINT(" of ");
WS_DEBUG_PRINT(addresses_failed_count);
WS_DEBUG_PRINT(")");
scanResp.bus_response =
wippersnapper_i2c_v1_BusResponse_BUS_RESPONSE_ERROR_HANG;
// NOTE: ESP-IDF appears to handle this "behind the scenes" by
// resetting/clearing the bus. The user should be prompted to
// perform a bus scan again.
break;
// perform a bus scan again. This is a workaround for the ESP32s2 in v3.1.x
if (current_failed_count > 5 || addresses_failed_count > 100) {
WS_DEBUG_PRINTLN("ESP_ERR_TIMEOUT: Too many bus hangs");
break;
}
goto start_scan;
} else if (endTransmissionRC == 7) {
WS_DEBUG_PRINT("I2C_ESP_ERR: SDA/SCL shorted, requests queued: ");
WS_DEBUG_PRINTLN(endTransmissionRC);
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