{"id":809,"date":"2023-02-14T08:35:46","date_gmt":"2023-02-14T00:35:46","guid":{"rendered":"http:\/\/www.huangrongzhen.ink\/?p=809"},"modified":"2023-10-28T14:20:44","modified_gmt":"2023-10-28T06:20:44","slug":"%e8%bd%af%e4%bb%b6-spi-%e9%a9%b1%e5%8a%a8","status":"publish","type":"post","link":"https:\/\/www.huangrongzhen.ink\/?p=809","title":{"rendered":"\u8f6f\u4ef6 SPI \u9a71\u52a8"},"content":{"rendered":"<div class=\"wp-block-post-excerpt\"><p class=\"wp-block-post-excerpt__excerpt\">\u9002\u7528\u4e8e GD32 \u7cfb\u5217\uff0c\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u79fb\u690d\u5230\u5176\u5b83\u5e73\u53f0 <\/p><\/div>\n\n\n<p>\u4f7f\u7528\u8f6f\u4ef6\u5b9e\u73b0\u7684 SPI \u9a71\u52a8\uff0c\u5728\u8fd9\u91cc\u8bb0\u5f55\u907f\u514d\u6bcf\u6b21\u90fd\u91cd\u65b0\u7f16\u5199\u4e00\u904d\u3002<\/p>\n\n\n\n<p>\u5ef6\u65f6\u51fd\u6570\u53ef\u4ee5\u4e3a\u7a7a\uff0c\u4e5f\u53ef\u4ee5\u7528\u5ef6\u65f6\u51fd\u6570\u3002\u5bf9\u4e8e\u9ad8\u901f MCU\uff0c\u5982\u679c\u901f\u5ea6\u8fc7\u5feb\uff0c\u53ef\u4ee5\u4f7f\u7528\u5ef6\u65f6\u51fd\u6570\u63a7\u5236\u4f20\u8f93\u901f\u5ea6\u3002<\/p>\n\n\n\n<p>\u7528\u6237\u9700\u8981\u81ea\u884c\u914d\u7f6e\u3001\u63a7\u5236\u7247\u9009\u4fe1\u53f7\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"c\" class=\"language-c\">\/\/\u5b8f\u5b9a\u4e49\n#define CLK_SET()   gpio_bit_set(GPIOB, GPIO_PIN_13)\n#define CLK_CLR()   gpio_bit_reset(GPIOB, GPIO_PIN_13)\n#define MOSI_SET()  gpio_bit_set(GPIOB, GPIO_PIN_15)\n#define MOSI_CLR()  gpio_bit_reset(GPIOB, GPIO_PIN_15)\n#define GET_MISO()  gpio_input_bit_get(GPIOB, GPIO_PIN_14)\n\/\/#define SPI_DELAY() DelayNus(1)\n#define SPI_DELAY()\n\n\/\/\u521d\u59cb\u5316\nvoid InitSPI(void)\n{\n  rcu_periph_clock_enable(RCU_GPIOB);\n  gpio_init(GPIOB, GPIO_MODE_OUT_PP, GPIO_OSPEED_MAX, GPIO_PIN_13 | GPIO_PIN_15);\n  gpio_init(GPIOB, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_MAX, GPIO_PIN_14);\n  gpio_bit_set(GPIOB, GPIO_PIN_13 | GPIO_PIN_15);\n}\n\n\/\/\u8bfb\u5199\u51fd\u6570\nunsigned char SPIReadWriteByte(unsigned char data)\n{\n  unsigned char i, output;\n\n  \/\/\u8fd4\u56de\u503c\u6e05\u96f6\n  output = 0;\n  \n  \/\/\u5faa\u73af\u53d1\u9001\n  for(i = 0; i &lt; 8; i++)\n  {\n    \/\/\u8bbe\u7f6e MOSI \u8f93\u51fa\n    if(data &amp; 0x80)\n    {\n      MOSI_SET();\n    }\n    else\n    {\n      MOSI_CLR();\n    }\n    \n    \/\/\u62c9\u4f4e\u65f6\u949f\u7ebf\n    CLK_CLR();\n    SPI_DELAY();\n    \n    \/\/\u62c9\u9ad8\u65f6\u949f\u7ebf\n    CLK_SET();\n    SPI_DELAY();\n\n    \/\/\u83b7\u53d6 MOSI \u8f93\u5165\n    output = (output &lt;&lt; 1) | GET_MISO();\n\n    \/\/\u53d1\u9001\u4e0b\u4e00\u4f4d\n    data = data &lt;&lt; 1;\n  }\n  \n  \/\/\u8ba9\u6570\u636e\u7ebf\u4e5f\u56de\u5f52\u5230\u9ad8\u7535\u5e73\n  MOSI_SET();\n\n  \/\/\u8fd4\u56de\n  return output;\n}\n\n\/\/\u6279\u91cf\u53d1\u51fd\u6570\nvoid SPIWriteMultiple(unsigned char* buf, unsigned int len)\n{\n  unsigned int i;\n  for(i  = 0; i &lt; len; i++)\n  {\n    SPIReadWriteByte(buf[i]);\n  }\n}\n\n\/\/\u6279\u91cf\u8bfb\u51fd\u6570\nvoid SPIReadMultiple(unsigned char* buf, unsigned int len)\n{\n  unsigned int i;\n  for(i  = 0; i &lt; len; i++)\n  {\n    buf[i] = SPIReadWriteByte(0xFF);\n  }\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9002\u7528\u4e8e GD32 \u7cfb\u5217\uff0c\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u79fb\u690d\u5230\u5176\u5b83\u5e73\u53f0<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,6],"tags":[],"_links":{"self":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/809"}],"collection":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=809"}],"version-history":[{"count":11,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/809\/revisions"}],"predecessor-version":[{"id":2181,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/809\/revisions\/2181"}],"wp:attachment":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=809"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}