91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
// Basic config
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#include "globals.h"
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#include "i2c.h"
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// Local logging tag
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static const char TAG[] = __FILE__;
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void i2c_init(void) {
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#ifdef HAS_DISPLAY
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Wire.begin(MY_OLED_SDA, MY_OLED_SCL, 400000);
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#else
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Wire.begin(SDA, SCL, 400000);
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#endif
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}
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void i2c_deinit(void) {
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Wire.~TwoWire(); // shutdown/power off I2C hardware
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#ifdef HAS_DISPLAY
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// to save power, because Wire.end() enables pullups
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pinMode(MY_OLED_SDA, INPUT);
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pinMode(MY_OLED_SCL, INPUT);
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#else
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pinMode(SDA, INPUT);
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pinMode(SCL, INPUT);
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#endif
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}
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int i2c_scan(void) {
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int i2c_ret, addr;
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int devices = 0;
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ESP_LOGI(TAG, "Starting I2C bus scan...");
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// block i2c bus access
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if (I2C_MUTEX_LOCK()) {
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// Scan at 100KHz low speed
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Wire.setClock(100000);
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for (addr = 8; addr <= 119; addr++) {
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Wire.beginTransmission(addr);
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Wire.write(addr);
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i2c_ret = Wire.endTransmission();
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if (i2c_ret == 0) {
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devices++;
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switch (addr) {
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case SSD1306_PRIMARY_ADDRESS:
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case SSD1306_SECONDARY_ADDRESS:
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ESP_LOGI(TAG, "0x%X: SSD1306 Display controller", addr);
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break;
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case BME_PRIMARY_ADDRESS:
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case BME_SECONDARY_ADDRESS:
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ESP_LOGI(TAG, "0x%X: Bosch BME MEMS", addr);
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break;
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case AXP192_PRIMARY_ADDRESS:
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ESP_LOGI(TAG, "0x%X: AXP192 power management", addr);
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break;
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case QUECTEL_GPS_PRIMARY_ADDRESS:
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ESP_LOGI(TAG, "0x%X: Quectel GPS", addr);
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break;
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case MCP_24AA02E64_PRIMARY_ADDRESS:
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ESP_LOGI(TAG, "0x%X: 24AA02E64 serial EEPROM", addr);
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break;
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default:
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ESP_LOGI(TAG, "0x%X: Unknown device", addr);
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break;
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}
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} // switch
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} // for loop
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ESP_LOGI(TAG, "I2C scan done, %u devices found.", devices);
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// Set back to 400KHz
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Wire.setClock(400000);
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I2C_MUTEX_UNLOCK(); // release i2c bus access
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} else
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ESP_LOGE(TAG, "I2c bus busy - scan error");
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return devices;
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} |