mirror of
https://github.com/espressif/ESP8266_RTOS_SDK.git
synced 2025-06-01 16:16:54 +08:00
92 lines
1.8 KiB
Markdown
92 lines
1.8 KiB
Markdown
# _I2C Example_
|
|
|
|
* This example will show you how to use I2C module:
|
|
|
|
* read external i2c sensor, here we use a MPU6050 sensor for instance.
|
|
|
|
## Pin assignment
|
|
|
|
* master:
|
|
* GPIO14 is assigned as the data signal of i2c master port
|
|
* GPIO2 is assigned as the clock signal of i2c master port
|
|
|
|
## How to use example
|
|
|
|
### Hardware Required
|
|
|
|
* Connection:
|
|
* connect sda/scl of sensor with GPIO14/GPIO2
|
|
* no need to add external pull-up resistors, driver will enable internal pull-up resistors.
|
|
|
|
### Configure the project
|
|
|
|
```
|
|
make menuconfig
|
|
```
|
|
|
|
* Set serial port under Serial Flasher Options.
|
|
|
|
|
|
### Build and Flash
|
|
|
|
Build the project and flash it to the board, then run monitor tool to view serial output:
|
|
|
|
```
|
|
make -j4 flash monitor
|
|
```
|
|
|
|
(To exit the serial monitor, type ``Ctrl-]``.)
|
|
|
|
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
|
|
|
|
## Example Output
|
|
|
|
```
|
|
I (0) gpio: GPIO[14]| InputEn: 0| OutputEn: 1| OpenDrain: 1| Pullup: 1| Pulldown: 0| Intr:0
|
|
I (0) gpio: GPIO[2]| InputEn: 0| OutputEn: 1| OpenDrain: 1| Pullup: 1| Pulldown: 0| Intr:0
|
|
I (0) main: *******************
|
|
|
|
I (0) main: who_am_i: 68
|
|
|
|
I (0) main: TEMP: 26.51
|
|
|
|
I (0) main: sensor_data[0]: -1288
|
|
|
|
I (0) main: sensor_data[1]: 8796
|
|
|
|
I (0) main: sensor_data[2]: 11088
|
|
|
|
I (0) main: sensor_data[3]: -3408
|
|
|
|
I (0) main: sensor_data[4]: -223
|
|
|
|
I (0) main: sensor_data[5]: 67
|
|
|
|
I (0) main: sensor_data[6]: -11
|
|
|
|
I (0) main: error_count: 0
|
|
|
|
I (0) main: *******************
|
|
|
|
I (0) main: who_am_i: 68
|
|
|
|
I (0) main: TEMP: 26.55
|
|
|
|
I (0) main: sensor_data[0]: -1224
|
|
|
|
I (0) main: sensor_data[1]: 8748
|
|
|
|
I (0) main: sensor_data[2]: 11084
|
|
|
|
I (0) main: sensor_data[3]: -3392
|
|
|
|
I (0) main: sensor_data[4]: -318
|
|
|
|
I (0) main: sensor_data[5]: 235
|
|
|
|
I (0) main: sensor_data[6]: 21
|
|
|
|
I (0) main: error_count: 0
|
|
|
|
```
|