133 lines
3.1 KiB
C++
133 lines
3.1 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) { Wire.begin(MY_DISPLAY_SDA, MY_DISPLAY_SCL, 400000); }
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void i2c_deinit(void) {
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Wire.~TwoWire(); // shutdown/power off I2C hardware
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// configure pins as input to save power, because Wire.end() enables pullups
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pinMode(MY_DISPLAY_SDA, INPUT);
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pinMode(MY_DISPLAY_SCL, INPUT);
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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 IP5306_PRIMARY_ADDRESS:
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ESP_LOGI(TAG, "0x%X: IP5306 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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}
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// mutexed functions for i2c r/w access
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uint8_t i2c_readBytes(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len) {
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if (I2C_MUTEX_LOCK()) {
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uint8_t ret = 0;
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Wire.beginTransmission(addr);
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Wire.write(reg);
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Wire.endTransmission(false);
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uint8_t cnt = Wire.requestFrom(addr, (uint8_t)len, (uint8_t)1);
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if (!cnt)
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ret = 0xFF;
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uint16_t index = 0;
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while (Wire.available()) {
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if (index > len) {
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ret = 0xFF;
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goto finish;
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}
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data[index++] = Wire.read();
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}
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finish:
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I2C_MUTEX_UNLOCK(); // release i2c bus access
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return ret;
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} else {
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ESP_LOGW(TAG, "[%0.3f] i2c mutex lock failed", millis() / 1000.0);
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return 0xFF;
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}
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}
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uint8_t i2c_writeBytes(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len) {
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if (I2C_MUTEX_LOCK()) {
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uint8_t ret = 0;
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Wire.beginTransmission(addr);
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Wire.write(reg);
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for (uint16_t i = 0; i < len; i++) {
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Wire.write(data[i]);
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}
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ret = Wire.endTransmission();
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I2C_MUTEX_UNLOCK(); // release i2c bus access
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return ret ? ret : 0xFF;
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} else {
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ESP_LOGW(TAG, "[%0.3f] i2c mutex lock failed", millis() / 1000.0);
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return 0xFF;
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}
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}
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