{"id":856,"date":"2014-12-28T18:26:56","date_gmt":"2014-12-28T09:26:56","guid":{"rendered":"http:\/\/research.itplants.com\/?p=856"},"modified":"2015-02-04T21:25:41","modified_gmt":"2015-02-04T12:25:41","slug":"mmra%e3%83%a9%e3%82%a4%e3%83%96%e3%83%a9%e3%83%aa%e3%83%bc%e3%81%a7ad%e5%a4%89%e6%8f%9b","status":"publish","type":"post","link":"https:\/\/research.itplants.com\/?p=856","title":{"rendered":"mraa\u30e9\u30a4\u30d6\u30e9\u30ea\u30fc\u3067AD\u5909\u63db"},"content":{"rendered":"

edison\u306emraa\u30e9\u30a4\u30d6\u30e9\u30ea\u30fc\u3092\u4f7f\u3063\u3066\u3001MCP3425\u3068\u3044\u3046ADC\u3092\u4f7f\u3048\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u306e\u3067\u3001\u8a18\u4e8b\u3092\u66f8\u304d\u307e\u3059\u3002<\/p>\n

MCP3425\u306f\u300112bit\/14bit\/16bit\u5207\u308a\u66ff\u3048\u3067\u4f7f\u3048\u308bAD\u5909\u63dbIC\u3067\u3059\u3002I2C\u3067\u63a5\u7d9a\u3057\u307e\u3059\u3002<\/p>\n

\r\n#include "mraa.h"                          \/* Edison GPIO\u7528\u30e9\u30a4\u30d6\u30e9\u30ea *\/\r\n\r\n#define ADRES_MCP3425 0x68  \/*  ADC MCP3425 16bit ADC I2C *\/\r\n\r\nmraa_i2c_context i2c;                    \/* I2C\u901a\u4fe1\u7528\u5909\u6570\u5ba3\u8a00 *\/\r\n\r\nvoid adc_init(){\r\n  uint8_t comand_data[2]={0x00,0x00};      \/* \u9001\u4fe1\u7528\u30d0\u30c3\u30d5\u30a1 *\/\r\n  mraa_init();                             \/* mraa\u30e9\u30a4\u30d6\u30e9\u30ea\u521d\u671f\u5316 *\/\r\n  i2c = mraa_i2c_init(1);                  \/* I2C\u901a\u4fe1\u521d\u671f\u5316 *\/\r\n\/*\r\n bit 7  RDY: Ready Bit\r\n bit 6-5        C1-C0 Channel Selection Bits 00\r\n bit 4          O\/C Conversion Mode Bit 1 Continuous Conversion Mode\r\n bit 3-2        10 15SPS(16bit)\r\n bit 3-2        01   SPS(14bit)\r\n bit 3-2        00   SPS(12bit)\r\n bit 1-0        Gain  00=1V\/V\r\n *\/\r\n        mraa_i2c_address(i2c, ADRES_MCP3425); \/* I2C\u30a2\u30c9\u30ec\u30b9\u8a2d\u5b9a *\/\r\n        comand_data[0]=0x00; \/\/ Register\r\n\r\n\/\/     One Shot \u304b \u9023\u7d9a\u53d6\u308a\u8fbc\u307f\u304b\u3092\u9078\u629e\u3059\u308b\r\n\/\/      comand_data[1]=0x10;\/\/ Continuous Conversion Mode\r\n        comand_data[1]=0x80;\/\/ One Shot Conversion Mode\r\n\r\n        mraa_i2c_write_byte(i2c, comand_data[1]); \/* COMMAND *\/\r\n}\r\n\r\nint adc_read()\r\n{\r\n        uint8_t comand_data[2]={0x00,0x00};      \/* \u9001\u4fe1\u7528\u30d0\u30c3\u30d5\u30a1 *\/\r\n        uint8_t val[3]={0x00,0x00,0x00};\r\n        char RDY=1;                                                         \r\n\r\n        \/\/     One Shot \u306a\u3089\u3053\u3053\u3067\u8aad\u307f\u8fbc\u307f\u3092\u958b\u59cb\u3059\u308b\u3002\u3000\u9023\u7d9a\u30e2\u30fc\u30c9\u306a\u3089\u4e0d\u8981\u3002\r\n        comand_data[0]=0x00; \/\/ Register\r\n        comand_data[1]=0x80;\/\/ One Shot Conversion Mode\r\n        mraa_i2c_write_byte(i2c, comand_data[1]); \/* COMMAND *\/\r\n        \/\/\r\n\r\n        while(RDY){\r\n        mraa_i2c_read(i2c, val, 3);     \/* I2C data read*\/\r\n        RDY = (val[2] & 0x80) >> 7; \/\/ Data Ready then LOW\r\n        }\r\n        val[0] = val[0] & 0x0F; \/\/ mask n bits\r\n        return ((int)val[0]*0xFF+val[1]);\r\n}\r\n<\/pre>\n
\u5206\u304b\u3063\u3066\u3057\u307e\u3048\u3070\u7c21\u5358\u306a\u3053\u3053\u3067\u3059\u304c\u3001\u5206\u304b\u3089\u306a\u3044\u3068\u975e\u5e38\u306b\u96e3\u3057\u3044\u3067\u3059\u306d\u3002
\n\u307e\u305a\u3001<\/p>\n
#define ADRES_MCP3425 0x68\u00a0 \/*\u00a0 ADC MCP3425 16bit ADC I2C *\/<\/pre>\n
\u306e\u3068\u3053\u308d\u3067\u3059\u304c\u3001MCP3425 \u306f\u30010x68\u3000\u3068\u3044\u3046I2C\u30d0\u30b9\u3067\u306e\u56fa\u6709\u30a2\u30c9\u30ec\u30b9\u3092\u3082\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30a2\u30c9\u30ec\u30b9\u304c\u885d\u7a81\u3059\u308b\u3082\u306e\u306f\u3001\u540c\u3058I2C\u30d0\u30b9\u3067\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002<\/p>\n
\u521d\u671f\u5316\u306e\u90e8\u5206\u3067\u306f\u3001<\/p>\n
\r\n  i2c = mraa_i2c_init(1);                  \/* I2C\u901a\u4fe1\u521d\u671f\u5316 *\/\r\n<\/pre>\n
\u3067\u306f\u3001I2C1\u3092\u521d\u671f\u5316\u3057\u307e\u3059\u3002<\/p>\n
\r\n  i2c = mraa_i2c_init(0);                  \/* I2C\u901a\u4fe1\u521d\u671f\u5316 *\/\r\n<\/pre>\n
\u3067\u306f\u3001I2C6\u304c\u521d\u671f\u5316\u3055\u308c\u307e\u3059\u3002\u4f55\u6545\u3001\u3053\u3093\u306a\u3084\u3084\u3063\u3053\u3057\u3044\u4ed5\u69d8\u306b\u3057\u305f\u306e\u3067\u3057\u3087\u3046\u304b\u306d\u3002<\/p>\n
\r\nmraa_i2c_write_byte(i2c, comand_data[1]); \/* COMMAND *\/\r\n<\/pre>\n
\u306e\u3068\u3053\u308d\u3067\u306f\u3001MCP3425\u306e\u30ec\u30b8\u30b9\u30bf\u306b\u3001\u8a2d\u5b9a\u5024\u3092\u66f8\u304d\u8fbc\u3093\u3067\u3044\u307e\u3059\u3002\u30ec\u30b8\u30b9\u30bf\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u30010x00\u3067\u3059\u3002\u30ec\u30b8\u30b9\u30bf\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u3001mraa_i2c_write_byte\u304c\u81ea\u52d5\u7684\u306b\u9078\u3093\u3067\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n
\u3061\u306a\u307f\u306b\u3001<\/p>\n
\r\nmraa_i2c_write_byte_data(i2c, comand_data, 2); \/* COMMAND *\/\r\n<\/pre>\n
\u3068\u3057\u3066\u3082\u540c\u3058\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u30ec\u30b8\u30b9\u30bf\u306b\u66f8\u304d\u8fbc\u3080\u5024\u3067\u3001One Shot\u304b\u9023\u7d9a\u53d6\u308a\u8fbc\u307f\u304b\u300112bit\/14bit\/16bit\u306eAD\u304b\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u8a2d\u5b9a\u5f8c\u306f\u3001\u00a0mraa_i2c_read(i2c, val, 3); \u3067\u8aad\u307f\u8fbc\u3080\u306e\u3067\u3059\u304c\u3001AD\u5909\u63db\u304c\u7d42\u308f\u3063\u3066\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u7d42\u308f\u3063\u3066\u3044\u306a\u3044\u306e\u306b\u5024\u3092\u8aad\u307f\u8fbc\u3080\u3068\u3001\u540c\u3058\u5024\u3070\u304b\u308a\u8aad\u307f\u8fbc\u3080\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\r\nwhile(RDY){\r\nmraa_i2c_read(i2c, val, 3); \u00a0 \u00a0 \/* I2C data read*\/\r\nRDY = (val[2] & 0x80) >> 7; \/\/ Data Ready then LOW\r\n}\r\n<\/pre>\n
3\u30d0\u30a4\u30c8\u76ee\u306b\u3001Config\u30d0\u30a4\u30c8\u304c\u3042\u308a\u3001\u305d\u3053\u306e7bit\u76ee\u3092\u898b\u3066\u3001RDY\u304c\uff10\u306b\u306a\u3063\u305f\u3089\u6b63\u3057\u3044\u5024\u304c\u8aad\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
edison\u306emraa\u30e9\u30a4\u30d6\u30e9\u30ea\u30fc\u3092\u4f7f\u3063\u3066\u3001MCP3425\u3068\u3044\u3046ADC\u3092\u4f7f\u3048\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u306e\u3067\u3001\u8a18\u4e8b\u3092\u66f8\u304d\u307e\u3059\u3002 MCP3425\u306f\u300112bit\/14bit\/16bit\u5207\u308a\u66ff\u3048\u3067\u4f7f\u3048\u308bAD\u5909\u63dbIC\u3067\u3059\u3002I2C\u3067\u63a5\u7d9a\u3057\u307e\u3059…<\/p>\n
 Read more →<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/research.itplants.com\/index.php?rest_route=\/wp\/v2\/posts\/856"}],"collection":[{"href":"https:\/\/research.itplants.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/research.itplants.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/research.itplants.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/research.itplants.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=856"}],"version-history":[{"count":11,"href":"https:\/\/research.itplants.com\/index.php?rest_route=\/wp\/v2\/posts\/856\/revisions"}],"predecessor-version":[{"id":950,"href":"https:\/\/research.itplants.com\/index.php?rest_route=\/wp\/v2\/posts\/856\/revisions\/950"}],"wp:attachment":[{"href":"https:\/\/research.itplants.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=856"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/research.itplants.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=856"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/research.itplants.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=856"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}