i2c scan with low speed

This commit is contained in:
Verkehrsrot 2019-10-13 16:59:03 +02:00
parent 970807d5c1
commit a7230af6d7

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@ -15,9 +15,11 @@ int i2c_scan(void) {
// block i2c bus access
if (I2C_MUTEX_LOCK()) {
// Scan at 100KHz low speed
Wire.setClock(100000);
for (addr = 8; addr <= 119; addr++) {
// scan i2c bus with no more to 100KHz
Wire.beginTransmission(addr);
Wire.write(addr);
i2c_ret = Wire.endTransmission();
@ -58,6 +60,9 @@ int i2c_scan(void) {
ESP_LOGI(TAG, "I2C scan done, %u devices found.", devices);
// Set back to 400KHz
Wire.setClock(400000);
I2C_MUTEX_UNLOCK(); // release i2c bus access
} else
ESP_LOGE(TAG, "I2c bus busy - scan error");