Noduino I2C Scan
来自Jack's Lab
(版本间的差异)
(→编译烧写) |
(→代码示例) |
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第102行: | 第102行: | ||
<source lang=cpp> | <source lang=cpp> | ||
+ | #include "noduino.h" | ||
+ | void setup() | ||
+ | { | ||
+ | serial_begin(115200); | ||
+ | wire_begin(); | ||
+ | } | ||
+ | |||
+ | void loop() | ||
+ | { | ||
+ | byte error, address; | ||
+ | int nDevices; | ||
+ | |||
+ | serial_printf("I2C Scanning...\r\n"); | ||
+ | |||
+ | nDevices = 0; | ||
+ | for (address = 1; address < 127; address++) { | ||
+ | // The i2c_scanner uses the return value of | ||
+ | // the wire_endTransmisstion to see if | ||
+ | // a device did acknowledge to the address. | ||
+ | wire_beginTransmission(address); | ||
+ | error = wire_endTransmission(); | ||
+ | |||
+ | if (error == 0) { | ||
+ | serial_printf("I2C device found at address 0x%02X\r\n", address); | ||
+ | nDevices++; | ||
+ | } else if (error == 4) { | ||
+ | serial_printf("Unknow error at address 0x%02X\r\n", address); | ||
+ | } | ||
+ | } | ||
+ | if (nDevices == 0) | ||
+ | serial_printf("No I2C devices found\r\n"); | ||
+ | else | ||
+ | serial_printf("done\r\n"); | ||
+ | |||
+ | delay(25*1000); | ||
+ | } | ||
</source> | </source> | ||
2016年8月28日 (日) 09:46的版本
目录 |
1 开发环境准备
根据您的系统,选择如下快速指南:
- Getting Started with Noduino SDK on Linux
- Getting Started with Noduino SDK on Mac OS X
- Getting Started with Noduino SDK on Windows
2 硬件准备
所有 I2C 设备,都接在:
- SCL --> D9
- SDA --> D8
3.3V 供电
保证连在总线上的所有设备地址不冲突!
3 编译烧写
进入你的 i2c-scan 目录:
$ cd /PATH/TO/noduino-sdk/examples/noduino/i2c-scan
编译、上传一步完成:
$ make flash
不同平台下,你的串口设备号可能不一样,确认一下你的串口设备,Linux 下 Falcon 开发板可能被识别为 /dev/ttyUSB1(dmesg 查看),则:
$ make flash ESPPORT=/dev/ttyUSB1
Windows 下 Falcon 开发板可能被识别为 COM6(控制面板 --> 设备管理器里查看),则:
$ make flash ESPPORT=COM6
4 查看结果
上传完之后,用串口工具,用 115200 的波特率打开串口,即可看到串口在持续输出传感器测得的值:
Windows 下可用串口调试助手这类插看
Linux 下推荐使用 picocom:
$ sudo apt-get install picocom $ picocom -b 115200 /dev/ttyUSB1 picocom v1.7 port is : /dev/ttyUSB2 flowcontrol : none baudrate is : 115200 parity is : none databits are : 8 escape is : C-a local echo is : no noinit is : no noreset is : no nolock is : no send_cmd is : sz -vv receive_cmd is : rz -vv imap is : omap is : emap is : crcrlf,delbs, Terminal ready ...... ......
Ctrl + a q 退出 picocom
5 代码示例
#include "noduino.h" void setup() { serial_begin(115200); wire_begin(); } void loop() { byte error, address; int nDevices; serial_printf("I2C Scanning...\r\n"); nDevices = 0; for (address = 1; address < 127; address++) { // The i2c_scanner uses the return value of // the wire_endTransmisstion to see if // a device did acknowledge to the address. wire_beginTransmission(address); error = wire_endTransmission(); if (error == 0) { serial_printf("I2C device found at address 0x%02X\r\n", address); nDevices++; } else if (error == 4) { serial_printf("Unknow error at address 0x%02X\r\n", address); } } if (nDevices == 0) serial_printf("No I2C devices found\r\n"); else serial_printf("done\r\n"); delay(25*1000); }
6 扩展阅读
- 更多问题参考: