DigitalInfinity/ESP32-PaxCounter
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

i2c scan with low speed

Browse Source
This commit is contained in:
Verkehrsrot 2019-10-13 16:59:03 +02:00
parent 970807d5c1
commit a7230af6d7
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/i2cscan.cpp
View File

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