\u3068\u3053\u308d\u3067\u3001\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3001\u3061\u3087\u3063\u3068\u5947\u5999\u3060\u3088\u306d\u3002<\/p>\n
for(unsigned long *p=PTR_START; p<PTR_END; p++){
CRCIN = *p;
}
crc_result = CRCOUT;<\/pre>\nCRCIN\u306b\u3072\u305f\u3059\u3089\u5024\u3092\u4ee3\u5165\u3057\u3066\u3001CRCOUT\u3092\u8aad\u3093\u3067\u3044\u308b\u3068\u3002<\/p>\n
\u5f53\u7136\u306e\u3053\u3068\u306a\u304c\u3089\u3001\u3053\u306eCRCIN\u3068\u3044\u3046\u306e\u306f\u666e\u901a\u306e\u5909\u6570\u3067\u306f\u306a\u304f\u3066\u3001\u30de\u30a4\u30b3\u30f3\u306e\u6a5f\u80fd\u30ec\u30b8\u30b9\u30bf\u3067\u3001<\/p>\n
CRCIN\u30ec\u30b8\u30b9\u30bf\u306b1\u56de\u66f8\u304d\u8fbc\u3080\u3068CRC\u6f14\u7b97\u304c1\u56de\u884c\u308f\u308c\u3001\u305d\u306e\u7d50\u679c\u306fCRCOUT\u304b\u3089\u53d6\u5f97\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3002<\/p>\n
\nCRC\u6f14\u7b97\u3063\u3066\u666e\u901a\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u66f8\u304f\u3068\u3081\u3093\u3069\u304f\u3055\u3044\u304c\u3001\u56de\u8def\u3067\u4f5c\u308c\u3070\u6bd4\u8f03\u7684\u7c21\u5358\u3060\u3002<\/p>\n
\u4f7f\u7528\u3057\u3066\u3044\u308b\u30de\u30a4\u30b3\u30f3\u3067\u306f\u3001CRC16\u3068CRC32\u306e\u4ee3\u8868\u7684\u306a\u3082\u306e\u304c\u8a08\u7b97\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u3002<\/p>\n
\u30de\u30a4\u30b3\u30f3\u306e\u30da\u30ea\u30d5\u30a7\u30e9\u30eb\u3063\u3066\u3053\u3046\u3044\u3046\u306e\u3082\u3042\u308b\u3093\u3067\u3059\u3088\u3002<\/p>\n
\u666e\u901a\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u66f8\u304f\u3088\u308a\u3082\u9ad8\u901f\u306b\u8a08\u7b97\u3067\u304d\u308b\u306e\u306f\u8a00\u3046\u307e\u3067\u3082\u306a\u3044\u304c\u3001<\/p>\n
\u305d\u308c\u3067\u3082\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066CRC\u6f14\u7b97\u3059\u308b\u3068\u6642\u9593\u304c\u304b\u304b\u3063\u3066\u3057\u307e\u3046\u3002<\/p>\n
\u3057\u304b\u3082\u3001\u6700\u521d\u306b\u66f8\u3044\u305f\u3088\u3046\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3084\u308b\u3068\u8a08\u7b97\u4e2d\u306f\u4ed6\u306e\u51e6\u7406\u304c\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u554f\u984c\u3082\u3042\u308b\u3002<\/p>\n
\n\u305d\u3053\u3067DMA\u3067\u3042\u308b\u3002<\/p>\n
DMA\u306fDirect Memory Access\u3001CPU\u3092\u4f7f\u308f\u305a\u306b\u30c7\u30fc\u30bf\u8ee2\u9001\u3092\u884c\u3046\u4ed5\u7d44\u307f\u3060\u3002<\/p>\n
\u4e0a\u306e\u51e6\u7406\u306f\u3001\u30c7\u30fc\u30bf\u3092\u53f3\u304b\u3089\u5de6\u306b\u6d41\u3057\u3066\u3044\u308b\u3060\u3051\u3060\u304b\u3089\u3001DMA\u306b\u3084\u3089\u305b\u308c\u3070\u305d\u306e\u9593\u306fCPU\u306f\u624b\u653e\u3057\u306b\u3067\u304d\u308b\u3002<\/p>\n
\u9001\u4fe1\u5143\u306e\u30dd\u30a4\u30f3\u30bf\u3060\u3051\u9032\u3081\u3066\u3001\u9001\u4fe1\u5148\u306e\u30dd\u30a4\u30f3\u30bf\u306f\u56fa\u5b9a\u3068\u3044\u3046\u3053\u3068\u3082\u3067\u304d\u308b\u306e\u3067\u3001\u6a5f\u80fd\u30ec\u30b8\u30b9\u30bf\u306b\u66f8\u304d\u8fbc\u307f\u7d9a\u3051\u308b\u3053\u3068\u3001<\/p>\n
\u9006\u306b\u9001\u4fe1\u5143\u3092\u56fa\u5b9a\u306b\u3057\u3066\u3001\u6a5f\u80fd\u30ec\u30b8\u30b9\u30bf\u3092\u8aad\u307f\u8fbc\u307f\u7d9a\u3051\u308b\u3068\u3044\u3046\u3053\u3068\u3082\u3067\u304d\u308b\u3002<\/p>\n
\u305d\u3057\u305f\u3089\u3001DMA\u3092\u4f7f\u3046\u3068\u624b\u653e\u3057\u306b\u3067\u304d\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u8ee2\u9001\u901f\u5ea6\u3082\u901f\u304b\u3063\u305f\u3002\u500d\u901f\u8fd1\u304b\u3063\u305f\u3002<\/p>\n
\u4eca\u56de\u306e\u7528\u9014\u3067\u306f\u3001\u8a08\u7b97\u5b8c\u4e86\u307e\u3067\u306b\u304b\u304b\u308b\u6642\u9593\u306f\u305d\u3053\u307e\u3067\u91cd\u8981\u3067\u306f\u306a\u3044\u3057\u3001CPU\u304c\u624b\u653e\u3057\u306b\u306a\u3089\u306a\u3044\u3068\u3057\u3066\u3082\u5de5\u592b\u3059\u308c\u3070\u306a\u3093\u3068\u304b\u306a\u308b\u306e\u3060\u304c\u3001<\/p>\n
DMA\u3092\u4f7f\u3063\u3066\u60aa\u3044\u3053\u3068\u306f\u4f55\u3082\u306a\u3044\u306e\u3067\u3001DMA\u3092\u4f7f\u3063\u3066CRC\u8a08\u7b97\u3092\u3059\u308b\u3053\u3068\u306b\u3057\u3088\u3046\u3068\u601d\u3046\u3002<\/p>\n
\n\u3055\u3066\u3001\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u8ee2\u9001\u3059\u308b\u306a\u3089\u3070DMA\u306f\u5927\u304d\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308b\u3002<\/p>\n
\u4ed6\u306b\u30da\u30ea\u30d5\u30a7\u30e9\u30eb\u304b\u3089\u306e\u5272\u308a\u8fbc\u307f\u3092DMA\u3067\u53d7\u3051\u3066\u3001\u305d\u308c\u306b\u5fdc\u3058\u3066\u30c7\u30fc\u30bf\u8ee2\u9001\u3092\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3068\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u30b7\u30ea\u30a2\u30eb\u901a\u4fe1\u306e\u9001\u4fe1\u30d0\u30c3\u30d5\u30a1\u306b4\u30d0\u30a4\u30c8\u00d7100\u56de\u8ee2\u9001\u3059\u308b\u3068DMA\u306b\u8a2d\u5b9a\u3057\u3066\u3001\u9001\u4fe1\u30d0\u30c3\u30d5\u30a1\u304c\u7a7a\u306e\u3068\u304d\u306b\u767a\u751f\u3059\u308b\u5272\u308a\u8fbc\u307f\u3092DMA\u306b\u3064\u306a\u3052\u3066\u304a\u304f\u3002<\/p>\n
\u305d\u306e\u4e0a\u3067\u3001\u6700\u521d\u306e1\u56de\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089\u30c8\u30ea\u30ac\u3092\u304b\u3051\u3066\u3084\u308c\u3070\u3001<\/p>\n
\u30d0\u30c3\u30d5\u30a1\u306b4\u30d0\u30a4\u30c8\u8ee2\u9001\u21924\u30d0\u30a4\u30c8\u9001\u4fe1\u2192\u30d0\u30c3\u30d5\u30a1\u304c\u7a7a\u306b\u306a\u3063\u305f\u306e\u30674\u30d0\u30a4\u30c8\u8ee2\u9001\u21924\u30d0\u30a4\u30c8\u9001\u4fe1\u2026\u2026\u3068\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4ecb\u3055\u305a\u306b\u3067\u304d\u308b\u3002<\/p>\n
4\u30d0\u30a4\u30c8\u00d7100\u56de\u306e\u8ee2\u9001\u3092\u7d42\u3048\u305f\u3089\u3001DMA\u8ee2\u9001\u5b8c\u4e86\u3068\u306a\u308b\u306e\u3067\u3001\u305d\u3053\u3067\u5272\u308a\u8fbc\u307f\u3092\u767a\u751f\u3055\u305b\u308b\u306a\u308a\u3001\u8ee2\u9001\u5b8c\u4e86\u3092\u30dd\u30fc\u30ea\u30f3\u30b0\u3057\u3066\u304a\u3051\u3070\u3088\u3044\u3002<\/p>\n
AD\u5909\u63db\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3001AD\u5909\u63db\u7d50\u679c\u304b\u3089RAM\u306b1\u30ef\u30fc\u30c9\u00d716\u56de\u8ee2\u9001\u3068DMA\u306b\u8a2d\u5b9a\u3057\u3066\u3001AD\u5909\u63db\u5b8c\u4e86\u5272\u308a\u8fbc\u307f\u3092DMA\u306b\u3064\u306a\u3052\u308b\u3002<\/p>\n
\u305d\u308c\u3067\u3001AD\u30b3\u30f3\u30d0\u30fc\u30bf\u306f\u5b9a\u5468\u671f\u3067\u52d5\u304f\u3088\u3046\u306b\u3057\u3066\u304a\u3051\u3070\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4ecb\u3055\u305a\u306b\u5b9a\u5468\u671f\u306716\u56de\u53d6\u5f97\u3057\u305f\u30a2\u30ca\u30ed\u30b0\u5024\u304cRAM\u306b\u683c\u7d0d\u3055\u308c\u308b\u3002<\/p>\n
\n\u305f\u3060\u3001DMA\u306f\u5358\u7d14\u306b\u5de6\u304b\u3089\u53f3\u306b\u30c7\u30fc\u30bf\u3092\u6d41\u3059\u3053\u3068\u3057\u304b\u3067\u304d\u306a\u3044\u3002CPU\u3092\u4f7f\u308f\u306a\u3044\u3068\u3044\u3046\u306e\u306f\u305d\u3046\u3044\u3046\u3053\u3068<\/p>\n
\u30b7\u30ea\u30a2\u30eb\u901a\u4fe1\u306e\u53d7\u4fe1\u30d0\u30c3\u30d5\u30a1\u304b\u3089RAM\u306b\u53d7\u4fe1\u30d0\u30c3\u30d5\u30a1\u304c\u6e80\u30bf\u30f3\u306b\u306a\u308b\u3054\u3068\u306bDMA\u306b\u8ee2\u9001\u3055\u305b\u308b\u3068\u3044\u3046\u3053\u3068\u3082\u3067\u304d\u308b\u304c\u3001<\/p>\n
DMA\u306b\u8a2d\u5b9a\u3057\u305f\u56de\u6570\u3088\u308a\u3082\u3001\u53d7\u4fe1\u3057\u305f\u30c7\u30fc\u30bf\u304c\u5c11\u306a\u3044\u3068\u3001DMA\u8ee2\u9001\u306f\u6c38\u9060\u306b\u7d42\u308f\u3089\u306a\u3044\u3057\u3001<\/p>\n
\u53d7\u4fe1\u4e2d\u306b\u30c7\u30fc\u30bf\u8ee2\u9001\u4ee5\u5916\u306e\u51e6\u7406\u3092\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3068\u306a\u308c\u3070\u3001DMA\u3060\u3051\u306b\u4efb\u305b\u3066\u304a\u3051\u306a\u3044\u3002<\/p>\n
1\u56de\u306e\u8ee2\u9001\u91cf\u304c\u5c11\u306a\u304f\u3066\u3082\u3001\u56de\u6570\u304c\u591a\u3044\u306e\u3092\u624b\u653e\u3057\u3067\u3067\u304d\u308c\u3070\u30e1\u30ea\u30c3\u30c8\u306f\u3042\u308b\u304c\u3001\u3069\u3046\u305b1\u56de1\u56de\u306f\u5c11\u91cf\u3060\u3057\u3068\u3044\u3046\u8003\u3048\u3082\u3042\u308b\u3002<\/p>\n
\u3084\u308a\u65b9\u6b21\u7b2c\u3067\u3059\u304b\u306d\u3002<\/p>\n
\nDMA\u3068\u3044\u3046\u3082\u306e\u81ea\u4f53\u306f\u77e5\u3063\u3066\u305f\u3051\u3069\u3001\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u8ee2\u9001\u3092\u3059\u308b\u3053\u3068\u3082\u305d\u3093\u306a\u306b\u591a\u304f\u306a\u3044\u3057\u306a\u3041\u3068\u601d\u3063\u3066\u305f\u3089\u3001<\/p>\n
CRC\u8a08\u7b97\u3068\u3044\u3046\u610f\u5916\u306a\u7528\u9014\u3067DMA\u304c\u5927\u304d\u306a\u52b9\u679c\u3092\u767a\u63ee\u3057\u305f\u306e\u3067\u3001\u3088\u3044\u767a\u898b\u3060\u3063\u305f\u3002<\/p>\n
\u305d\u3082\u305d\u3082CRC\u8a08\u7b97\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304b\u305a\u306b\u6e08\u3080\u3060\u3051\u3067\u3082\u30e9\u30c3\u30ad\u30fc\u3068\u601d\u3063\u305f\u3051\u3069\u3001<\/p>\n
\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u3067CRC\u8a08\u7b97\u3067\u304d\u308b\u3068\u3053\u3093\u306a\u3053\u3068\u3082\u3067\u304d\u3061\u3083\u3046\u3093\u3060\u3088\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3068\u3053\u308d\u3067\u3001\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3001\u3061\u3087\u3063\u3068\u5947\u5999\u3060\u3088\u306d\u3002 for(unsigned long *p=PTR_START; p<PTR_END; p++){ CRCIN = *p;}crc_result = CRC […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-4965","post","type-post","status-publish","format-standard","hentry","category-science"],"_links":{"self":[{"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=\/wp\/v2\/posts\/4965","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4965"}],"version-history":[{"count":0,"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=\/wp\/v2\/posts\/4965\/revisions"}],"wp:attachment":[{"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hdmr.org\/d\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}