{"id":381,"date":"2022-12-16T15:34:30","date_gmt":"2022-12-16T07:34:30","guid":{"rendered":"http:\/\/www.huangrongzhen.ink\/?p=381"},"modified":"2023-10-25T13:58:45","modified_gmt":"2023-10-25T05:58:45","slug":"dma-%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.huangrongzhen.ink\/?p=381","title":{"rendered":"DMA \u5b66\u4e60\u7b14\u8bb0"},"content":{"rendered":"

\u8bb0\u5f55\u4e00\u4e9b DMA \u5b66\u4e60\u8fc7\u7a0b\u4e2d\u7684\u5fc3\u5f97\u4f53\u4f1a\uff0c\u9002\u7528\u4e8e GD32 \u6216 STM32 \u5e73\u53f0\u3002\u4ece\u65b0\u7684\u89c6\u89d2\u53bb\u7406\u89e3 DMA \u4e2d\u7684… <\/p><\/div>\n\n\n

<\/span>DMA \u7684\u4f20\u8f93\u6a21\u5f0f<\/span><\/h2>\n\n\n\n

DMA \u7684\u6570\u636e\u4f20\u8f93\u6709\u5927\u81f4\u53ef\u4ee5\u5206\u4e3a\u4e24\u7c7b\uff0c\u4e00\u7c7b\u662f\u9700\u8981\u8bf7\u6c42\u4fe1\u53f7\uff0c\u53e6\u4e00\u7c7b\u662f\u4e0d\u9700\u8981\u8bf7\u6c42\u4fe1\u53f7\u3002DMA \u7684\u5185\u5b58\u5230\u5185\u5b58\u6a21\u5f0f\uff08M2M\uff09<\/strong>\u4e0d\u9700\u8981\u8bf7\u6c42\u4fe1\u53f7\uff0c\u5916\u8bbe\u5230\u5185\u5b58\uff08P2M\uff09<\/strong>\u548c\u5185\u5b58\u5230\u5916\u8bbe\uff08M2P\uff09<\/strong> \u6a21\u5f0f\u9700\u8981\u8bf7\u6c42\u4fe1\u53f7\u3002<\/p>\n\n\n\n

\u62ff\u5185\u5b58\u62f7\u8d1d\u4e3a\u4f8b\uff0c\u5982\u679c\u53ea\u662f\u7b80\u5355\u7684\u5185\u5b58\u62f7\u8d1d\uff0c\u90a3\u4e48\u53ef\u4ee5\u7528 DMA \u7684 M2M \u6a21\u5f0f\uff0c\u6b64\u65f6\u6570\u636e\u7684\u62f7\u8d1d\u901f\u5ea6\u4ec5\u53d7\u9650\u4e8e\u5185\u90e8\u603b\u7ebf\u7684\u4f20\u8f93\u901f\u5ea6\uff0c\u8fd9\u5c31\u5c5e\u4e8e\u4e0d\u9700\u8981\u8bf7\u6c42\u4fe1\u53f7\u7684 DMA \u4f20\u8f93\uff1b\u5982\u679c\u5bf9\u62f7\u8d1d\u7684\u901f\u5ea6\u6709\u8981\u6c42\uff0c\u4f8b\u5982\u9700\u8981\u6bcf\u9694 10us \u62f7\u8d1d\u4e00\u4e2a\u6570\u636e\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u5f15\u5165\u5b9a\u65f6\u5668\u53d1\u8d77\u8bf7\u6c42\u4fe1\u53f7\u63a7\u5236\u62f7\u8d1d\u901f\u5ea6\uff0c\u6b64\u65f6 DMA \u7684\u4f20\u8f93\u5c31\u4e0e\u5b9a\u65f6\u5668\uff0c\u51c6\u786e\u7684\u8bf4\u662f\u5b9a\u65f6\u5668\u53d1\u8d77\u7684\u8bf7\u6c42\u4fe1\u53f7\u626f\u4e0a\u4e86\u5173\u7cfb\uff0c\u8fd9\u65f6\u5c31\u4e0d\u80fd\u7528 M2M \u6a21\u5f0f\u4e86\uff0c\u5e94\u8be5\u7528 P2M \u6216 M2P \u6a21\u5f0f\u3002\u4f7f\u7528\u5b9a\u65f6\u5668\u63a7\u5236 DMA \u505a\u5185\u5b58\u62f7\u8d1d\u60c5\u51b5\u4e0b\uff0cDMA \u7684\u5916\u8bbe\u5730\u5740\u53ef\u4ee5\u6307\u5411\u7cfb\u7edf\u4e2d\u7684\u4efb\u4e00\u5730\u5740\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ef\u4ee5\u6307\u5411\u5904\u7406\u5668\u67d0\u4e00\u5916\u8bbe\u7684\u5bc4\u5b58\u5668\u5730\u5740\uff0c\u4e5f\u53ef\u4ee5\u6307\u5411 SRAM\/Flash \u91cc\u7684\u4efb\u4e00\u5730\u5740\uff1b\u540c\u7406\uff0c\u6b64\u65f6 DMA \u7684\u5185\u5b58\u5730\u5740\u4e5f\u53ef\u4ee5\u6307\u5411\u7cfb\u7edf\u4e2d\u7684\u4efb\u4e00\u5730\u5740\u3002<\/p>\n\n\n\n

<\/span>DMA \u4e0e\u5916\u8bbe\u95f4\u7684\u6570\u636e\u4f20\u8f93<\/span><\/h2>\n\n\n\n

DMA \u4e0e\u5916\u8bbe\u95f4\u7684\u6570\u636e\u4f20\u8f93\u53ef\u4ee5\u5206\u6210\u4e24\u7c7b\uff0c\u4e00\u7c7b\u662f\u5916\u8bbe\u652f\u6301 DMA\uff0c\u53e6\u4e00\u7c7b\u662f\u5916\u8bbe\u4e0d\u652f\u6301 DMA\u3002\u5916\u8bbe\u652f\u6301 DMA \u662f\u6307\u5916\u8bbe\u81ea\u5df1\u80fd\u4ea7\u751f DMA \u8bf7\u6c42\u4fe1\u53f7\uff0c\u4ee5 GD32F303ZET6 \u7684\u4e32\u53e3\u4e3a\u4f8b\uff0c\u8be5\u5904\u7406\u5668\u603b\u5171\u6709 5 \u4e2a\u4e32\u53e3\uff0c\u5176\u4e2d UART0 ~ UART3 \u652f\u6301 DMA\uff0cUART4 \u4e0d\u652f\u6301 DMA\u3002\u4e5f\u5c31\u662f\u8bf4 UART0 ~ UART3 \u80fd\u591f\u81ea\u5df1\u4ea7\u751f DMA \u8bf7\u6c42\u4fe1\u53f7\uff0cUART4 \u5e76\u4e0d\u80fd\u4ea7\u751f DMA \u8bf7\u6c42\u4fe1\u53f7\u3002<\/p>\n\n\n\n

\u5bf9\u4e8e\u652f\u6301 DMA \u7684\u5916\u8bbe\uff0c\u4e0e DMA \u4e4b\u95f4\u7684\u4ea4\u4e92\u53ef\u4ee5\u6709\u4e24\u79cd\u9009\u62e9\uff0c\u4e00\u662f\u5916\u8bbe\u81ea\u5df1\u4ea7\u751f DMA \u8bf7\u6c42\u4fe1\u53f7\uff0c\u8bf7\u6c42 DMA \u53d1\u8d77\u4e00\u6b21\u6570\u636e\u4f20\u8f93\uff1b\u4e8c\u662f\u5916\u8bbe\u4e0d\u53d1\u8d77 DMA \u8bf7\u6c42\u4fe1\u53f7\uff0c\u800c\u662f\u7531\u5176\u5b83\u5916\u8bbe\uff0c\u4f8b\u5982\u5b9a\u65f6\u5668\u53d1\u8d77 DMA \u8bf7\u6c42\u4fe1\u53f7\uff0c\u89e6\u53d1\u6570\u636e\u4f20\u8f93\u3002<\/p>\n\n\n\n

\u5bf9\u4e8e\u4e0d\u652f\u6301 DMA \u7684\u5916\u8bbe\uff0c\u53ea\u80fd\u901a\u8fc7\u5176\u5b83\u5916\u8bbe\uff0c\u4f8b\u5982\u5b9a\u65f6\u5668\u4ea7\u751f DMA \u8bf7\u6c42\uff0c\u89e6\u53d1\u6570\u636e\u4f20\u8f93\u3002<\/p>\n\n\n\n

\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cDMA \u7684\u8bf7\u6c42\u4e0e\u5916\u8bbe\u5730\u5740\u3001\u5185\u5b58\u5730\u5740\u5e76\u65e0\u5173\u7cfb\u3002\u5fae\u5904\u7406\u5668\u4e2d\u7684\u5916\u8bbe\uff0c\u4f8b\u5982\u5b9a\u65f6\u5668\u3001ADC\u3001DAC \u7b49\u7b49\uff0c\u53ea\u8981\u662f\u80fd\u4ea7\u751f DMA \u8bf7\u6c42\u7684\uff0c\u90fd\u80fd\u7528\u4e8e\u63a7\u5236\u5176\u5b83\u5916\u8bbe\u4e0e DMA \u7684\u4ea4\u4e92\uff0c\u4f7f\u7528\u5b9a\u65f6\u5668\u63a7\u5236 DMA \u4f20\u8f93\u901f\u5ea6\u7684\u6bd4\u8f83\u591a\u3002<\/p>\n\n\n\n

<\/span>DMA \u7684\u6570\u636e\u4f20\u8f93\u65b9\u5411<\/span><\/h2>\n\n\n\n

\u4f7f\u7528 DMA \u65f6\uff0c\u6700\u91cd\u8981\u7684\u4e00\u70b9\uff0c\u4e0d\u8981\u88ab\u5916\u8bbe\u5730\u5740\u548c\u5185\u5b58\u5730\u5740\u8bef\u5bfc\uff0c\u5916\u8bbe\u5730\u5740\u548c\u5185\u5b58\u5730\u5740\u53ef\u4ee5\u6307\u5411\u7cfb\u7edf\u4e2d\u4efb\u610f\u5730\u5740\uff0c\u5916\u8bbe\u5730\u5740\u5e76\u4e0d\u4e00\u5b9a\u8981\u6307\u5411\u67d0\u4e00\u5bc4\u5b58\u5668\u5730\u5740\uff0c\u5185\u5b58\u5730\u5740\u4e5f\u4e0d\u4e00\u5b9a\u975e\u5f97\u662f\u6307\u5411\u5185\u5b58 SRAM \u6216 Flash\u3002DMA \u7684\u6570\u636e\u4f20\u8f93\u65b9\u5411\u5e76\u4e0d\u4ee3\u8868\u5916\u8bbe\u7684\u6570\u636e\u4f20\u8f93\u65b9\u5411\u3002DMA \u6570\u636e\u4f20\u8f93\u65b9\u5411\u4e3a\u5916\u8bbe\u5230\u5185\u5b58\uff0c\u53ea\u662f\u8bf4\u8981\u5c06\u6570\u636e\u4ece\u5916\u8bbe\u5730\u5740\uff08\u53ef\u4ee5\u6307\u5411\u4efb\u610f\u5730\u5740\uff09\u642c\u8fd0\u5230\u5185\u5b58\u5730\u5740\uff08\u4e5f\u53ef\u4ee5\u6307\u5411\u4efb\u610f\u5730\u5740\uff09\uff0c\u5e76\u4e0d\u662f\u8bf4\u6570\u636e\u4e00\u5b9a\u8981\u4ece SRAM \u642c\u8fd0\u5230\u67d0\u4e00\u5916\u8bbe\u7684\u5bc4\u5b58\u5668\u3002\u4ee5\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\u4e3a\u4f8b\u3002<\/p>\n\n\n\n

\u8fd9\u662f\u4e00\u6bb5\u4e32\u53e3 DMA \u53d1\u9001<\/strong>\u6570\u636e\u7a0b\u5e8f\uff0c\u7528\u4e8e\u5c06\u5185\u5b58\u4e2d\u7684\u4e00\u6bb5\u6570\u636e\u901a\u8fc7\u4e32\u53e3\u53d1\u9001\u51fa\u53bb\u3002\u9996\u5148\u58f0\u660e\u4e00\u70b9\uff0c\u8fd9\u6bb5\u4ee3\u7801\u662f\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u7684\u3002\u8fd9\u91cc\u6211\u6545\u610f\u5c06\u5916\u8bbe\u5730\u5740\u6307\u5411\u4e86 SRAM\/Flash \u67d0\u4e00\u5730\u5740\uff0c\u5185\u5b58\u5730\u5740\u53cd\u800c\u6307\u5411\u4e86\u4e32\u53e3\u6570\u636e\u5bc4\u5b58\u5668\u5730\u5740\uff0c\u6570\u636e\u4f20\u8f93\u65b9\u5411\u8bbe\u5b9a\u4e3a\u5916\u8bbe\u5230\u5185\u5b58\u3002\u540c\u65f6\u7981\u7528\u4e86\u5185\u5b58\u5730\u5740\u589e\u6da8\u548c\u4f7f\u80fd\u4e86\u5916\u8bbe\u5730\u5740\u589e\u6da8\u3002\u4e3a\u4e86\u80fd\u4ea7\u751f DMA \u8bf7\u6c42\uff0c\u9700\u8981\u5c06\u4e32\u53e3\u7684 DMA \u53d1\u9001\u5f00\u5173\u6253\u5f00<\/strong>\u3002<\/p>\n\n\n\n

\u8fd9\u6bb5\u4ee3\u7801\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u5c31\u8bf4\u660e\u4e86\u524d\u8fb9\u7684\u5047\u8bbe\u662f\u6b63\u786e\u7684\uff0c\u5916\u8bbe\u5730\u5740\u548c\u5185\u5b58\u5730\u5740\u5b9e\u9645\u6307\u5411\u54ea\u91cc\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u81ea\u7531\u914d\u7f6e\u3002\u5b9e\u9645\u5e94\u7528\u7684\u65f6\u5019\uff0c\u5916\u8bbe\u5730\u5740\u8fd8\u662f\u8981\u6307\u5411\u5916\u8bbe\u5bc4\u5b58\u5668\uff0c\u5185\u5b58\u5730\u5740\u8fd8\u662f\u8981\u6307\u5411 SRAM\/Flash \uff0c\u65b9\u4fbf\u540e\u7eed\u7684\u7ef4\u62a4\u548c\u5f00\u53d1\uff0c\u5426\u5219\u5bb9\u6613\u51fa\u73b0\u8bef\u89e3\u3002<\/p>\n\n\n\n

\/\/\u4e32\u53e3\u53d1\u9001\u51fd\u6570\nunsigned int WriteUART0(unsigned char *pBuf, unsigned int len)\n{\n  \/\/DMA\u521d\u59cb\u5316\u7ed3\u6784\u4f53\n  dma_parameter_struct dma_init_struct;\n  \n  \/\/\u914d\u7f6eDMA\n  rcu_periph_clock_enable(RCU_DMA0);\n  dma_deinit(DMA0, DMA_CH3);                                      \/\/\u590d\u4f4dDMA\u901a\u9053\n  dma_init_struct.direction    = DMA_PERIPHERAL_TO_MEMORY;        \/\/\u8bbe\u7f6eDMA\u6570\u636e\u4f20\u8f93\u65b9\u5411\uff08\u6545\u610f\u8bbe\u6210\u5916\u8bbe\u5230\u5730\u5740\uff09\n  dma_init_struct.memory_addr  = (uint32_t)&USART_DATA(USART0);   \/\/\u5185\u5b58\u5730\u5740\u8bbe\u7f6e\uff08\u6545\u610f\u8bbe\u6210 UART \u7684\u6570\u636e\u5bc4\u5b58\u5668\u5730\u5740\uff09\n  dma_init_struct.memory_inc   = DMA_MEMORY_INCREASE_DISABLE;     \/\/\u7981\u6b62\u5185\u5b58\u5730\u5740\u589e\u6da8\n  dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;           \/\/\u5185\u5b58\u6570\u636e\u4f4d\u6570\u8bbe\u7f6e\n  dma_init_struct.number       = len;                             \/\/\u5185\u5b58\u6570\u636e\u91cf\u8bbe\u7f6e\n  dma_init_struct.periph_addr  = (uint32_t)pBuf;                  \/\/\u5916\u8bbe\u5730\u5740\u8bbe\u7f6e\uff08\u6545\u610f\u8bbe\u6210 SRAM \u5185\u5730\u5740\uff09\n  dma_init_struct.periph_inc   = DMA_PERIPH_INCREASE_ENABLE;      \/\/\u4f7f\u80fd\u5916\u8bbe\u5730\u5740\u589e\u6da8\n  dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;       \/\/\u5916\u8bbe\u6570\u636e\u4f4d\u6570\u8bbe\u7f6e\n  dma_init_struct.priority     = DMA_PRIORITY_MEDIUM;             \/\/\u4f18\u5148\u7ea7\u8bbe\u7f6e\n  dma_init(DMA0, DMA_CH3, &dma_init_struct);                      \/\/\u6839\u636e\u53c2\u6570\u521d\u59cb\u5316\n  dma_circulation_disable(DMA0, DMA_CH3);                         \/\/\u5355\u6b21\u4f20\u8f93\n  dma_memory_to_memory_disable(DMA0, DMA_CH3);                    \/\/\u7981\u7528\u5185\u5b58\u5230\u5185\u5b58\n\n  \/\/\u5f00\u542fDMA\u4f20\u8f93\n  dma_channel_enable(DMA0, DMA_CH3);\n  \n  \/\/\u7b49\u5f85\u4f20\u8f93\u5b8c\u6210\n  while(RESET == dma_flag_get(DMA0, DMA_CH3, DMA_FLAG_FTF)){}\n\n  \/\/\u8fd4\u56de\u5b9e\u9645\u5199\u5165\u6570\u636e\u7684\u4e2a\u6570\n  return len;\n}<\/code><\/pre>\n\n\n\n
\u5728 TI \u516c\u53f8\u53d1\u5e03\u7684 C28x \u67b6\u6784\u4e2d\uff0c\u4ee5TMS320F2833x\u3001TMS320F2823x \u4e3a\u4f8b\uff0c\u8fd9\u7c7b\u5fae\u5904\u7406\u5668\u7684 DMA \u5c31\u6ca1\u6709\u5916\u8bbe\u5730\u5740\u548c\u5185\u5b58\u5730\u5740\u4e00\u8bf4\uff0c\u53ea\u8bbe\u7f6e\u4e86\u6e90\u5730\u5740\u548c\u76ee\u7684\u5730\u5740\uff0c\u6570\u636e\u56fa\u5b9a\u4ece\u6e90\u5730\u5740\u4f20\u8f93\u5230\u76ee\u7684\u5730\u5740\u3002<\/p>\n\n\n\n
<\/span>DMA \u8bf7\u6c42<\/span><\/h2>\n\n\n\n
\u73b0\u5728\u56de\u8fc7\u5934\u6765\u770b DMA \u4e0e\u5916\u8bbe\u95f4\u7684\u6570\u636e\u4f20\u8f93\uff0c\u8fd8\u662f\u4ee5\u4e32\u53e3\u4e3a\u4f8b\u3002\u6211\u4eec\u90fd\u77e5\u9053\uff0c\u4e32\u53e3\u7684\u4f20\u8f93\u901f\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u4ee5\u6ce2\u7279\u7387 115200\u4e3a\u4f8b\uff0c\u5047\u5b9a\u4e00\u4e2a\u8d77\u59cb\u4f4d + 8 \u4e2a\u6570\u636e\u4f4d + \u4e00\u4e2a\u505c\u6b62\u4f4d\u3002\u5728 115200 \u6ce2\u7279\u7387\u4e0b\uff0c\u6bcf\u79d2\u949f\u53ef\u4ee5\u4f20\u8f93 11520 \u4e2a\u5b57\u8282\uff0c\u4e5f\u5c31\u662f\u4e00\u4e2a\u5b57\u8282\u9700\u8981 86.8us \u624d\u80fd\u88ab\u53d1\u9001\u51fa\u53bb\u3002\u8fd9\u65f6\u5019\u6211\u4eec\u4e0d\u80fd\u7528 DMA \u7684 M2M \u6a21\u5f0f\u53bb\u53d1\u9001\u4e32\u53e3\u6570\u636e\uff0c\u56e0\u4e3a M2M \u6a21\u5f0f\u4e0b\u6570\u636e\u4f20\u8f93\u901f\u5ea6\u7279\u522b\u5feb\uff0c\u4e0a\u4e00\u4e2a\u5b57\u8282\u8fd8\u672a\u4f20\u8f93\u5b8c\u6210\uff0c\u5199\u4e00\u4e2a\u5b57\u8282\u53c8\u6765\u4e86\uff0c\u8fd9\u65f6\u5c31\u4f1a\u9020\u6210\u6570\u636e\u4f20\u8f93\u9519\u8bef\u3002\u6240\u4ee5\u901a\u8fc7 DMA \u53d1\u9001\u4e32\u53e3\u6570\u636e\u65f6\uff0c\u53ea\u80fd\u4f7f\u7528 M2P \u6216 P2M\u6a21\u5f0f\u3002<\/p>\n\n\n\n
\u5728 M2P \u6216 P2M\u6a21\u5f0f\u4e0b\uff0cDMA \u7684\u4f20\u8f93\u4f9d\u8d56\u4e8e DMA \u8bf7\u6c42\uff0c\u5916\u8bbe\u6bcf\u53d1\u8d77\u4e00\u6b21 DMA \u8bf7\u6c42\uff0cDMA \u4fbf\u4f20\u8f93\u4e00\u4e2a\u6570\u636e\uff0c\u53ef\u4ee5\u662f 1 \u4e2a 8 \u4f4d\u6570\u636e\uff0c\u53ef\u4ee5\u662f 1 \u4e2a 16 \u4f4d\u6570\u636e\uff0c\u4e5f\u53ef\u4ee5\u662f 1 \u4e2a 32 \u4f4d\u6570\u636e\u3002\u8fd9\u4e2a DMA \u8bf7\u6c42\u53ef\u4ee5\u662f\u5916\u8bbe\u81ea\u5df1\u4ea7\u751f\uff0c\u4e5f\u53ef\u4ee5\u662f\u5176\u5b83\u5916\u8bbe\u4ea7\u751f\u3002<\/p>\n\n\n\n
\u4e32\u53e3\u53d1\u9001\u6570\u636e\u65f6\uff0c\u5982\u679c\u6253\u5f00\u4e86 DMA \u53d1\u9001\u4f7f\u80fd\u5f00\u5173\uff0c\u90a3\u4e48\u6bcf\u53d1\u5b8c\u4e00\u4e2a\u5b57\u8282\u5c31\u4f1a\u53d1\u51fa\u4e00\u4e2a DMA \u8bf7\u6c42\uff0c\u8fd9\u4e2a DMA \u8bf7\u6c42\u53ea\u4f1a\u4f5c\u7528\u4e8e\u7279\u5b9a\u7684 DMA \u901a\u9053\uff0c\u5bf9\u4e8e GD32F303ZET6\uff0c\u5c31\u662f DMA0 \u7684\u901a\u9053 3\u3002\u6ce8\u610f\uff1a\u8fd9\u4e2a DMA \u53d1\u9001\u4f7f\u80fd\u5f00\u5173\u4f4d\u4e8e UART \u5916\u8bbe\uff0c\u800c\u4e0d\u662f DMA\u5916\u8bbe\u3002DMA0 \u7684\u901a\u9053 3 \u63a5\u6536\u5230\u8bf7\u6c42\u540e\u4fbf\u4f20\u8f93\u4e0b\u4e00\u4e2a\u6570\u636e\uff0c\u5982\u6b64\u5faa\u73af\u53cd\u590d\uff0c\u76f4\u81f3\u6570\u636e\u53d1\u9001\u5b8c\u6210\u3002DMA0 \u7684\u901a\u9053 3 \u53d1\u9001\u5b8c\u6700\u540e\u4e00\u6570\u636e\u540e\uff0c\u968f\u5373\u5c06\u901a\u9053\u7684\u4f7f\u80fd\u5f00\u5173\u5173\u6389\uff0c\u5373 DMA \u901a\u9053\u7684\u4f7f\u80fd\u5f00\u5173\u5728\u6570\u636e\u4f20\u8f93\u5b8c\u6bd5\u540e\u4f1a\u81ea\u52a8\u5173\u95ed\u3002\u56e0\u4e3a\u662f\u5199\u5165\u4e32\u53e3\u7684\u6570\u636e\u5bc4\u5b58\u5668\uff0c\u6240\u4ee5 UART \u4f1a\u5f00\u542f\u4e00\u6b21\u6570\u636e\u4f20\u8f93\uff0c\u5c06\u5199\u5165\u7684\u6570\u636e\u53d1\u9001\u51fa\u53bb\u3002\u6570\u636e\u53d1\u9001\u5b8c\u6bd5\u540e\uff0c\u56e0\u4e3a\u6253\u5f00\u4e86\u4e32\u53e3 DMA \u53d1\u9001\u4f7f\u80fd\u5f00\u5173\uff0c\u6240\u4ee5 UART \u4f1a\u53d1\u8d77\u4e00\u6b21 DMA \u8bf7\u6c42\uff0c\u4f46\u6b64\u65f6 DMA \u901a\u9053\u5904\u4e8e\u7981\u7528\u72b6\u6001\uff0c\u6240\u4ee5\u8be5\u8bf7\u6c42\u4f1a\u88ab\u5ffd\u7565\uff08\u629b\u5f03\uff09\u3002UART \u53ea\u7ba1\u53d1\u8d77 DMA \u8bf7\u6c42\uff0c\u5e76\u4e0d\u5173\u5fc3\u8be5\u8bf7\u6c42\u662f\u5426\u6709\u4f5c\u7528\u3002<\/p>\n\n\n\n
\u8fd9\u4e5f\u5c31\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec\u662f\u80fd DMA \u53d1\u9001\u4e32\u53e3\u6570\u636e\u540e\uff0cprintf \u51fd\u6570\u8fd8\u80fd\u6b63\u5e38\u4f7f\u7528\u7684\u539f\u56e0\uff0cprintf \u51fd\u6570\u7684\u79fb\u690d\u5982\u4e0b\u6240\u793a\u3002printf \u51fd\u6570\u6bcf\u8f93\u51fa\u4e00\u4e2a\u5b57\u8282\uff0cUART \u90fd\u4f1a\u53d1\u8d77\u4e00\u6b21 DMA \u8bf7\u6c42\uff0c\u4f46\u6b64\u65f6 DMA \u901a\u9053\u65f6\u5173\u95ed\u7684\uff0c\u8be5\u8bf7\u6c42\u88ab\u5ffd\u7565\uff08\u629b\u5f03\uff09\u3002\u6240\u4ee5\u53ea\u8981 DMA \u53d1\u9001\u671f\u95f4\u4e0d\u8c03\u7528 printf \u51fd\u6570\uff0c\u5355\u7247\u673a\u5c31\u80fd\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n\n\n\n
\/\/\u91cd\u5b9a\u5411 fputc \u51fd\u6570\nint fputc(int ch, FILE *f)\n{\n  \/\/\u53d1\u9001\u5b57\u7b26\u51fd\u6570\uff0c\u4e13\u7531fputc\u51fd\u6570\u8c03\u7528\n  usart_data_transmit(USART0, (uint8_t) ch);\n\n  \/\/\u7b49\u5f85\u4e0a\u4e00\u6b21\u53d1\u9001\u5b8c\u6210\n  while(RESET == usart_flag_get(USART0, USART_FLAG_TBE));\n\n  return ch;\n}<\/code><\/pre>\n\n\n\n
\u7efc\u4e0a\uff0c\u5982\u679c\u542f\u7528\u4e86 M2P \u6216 P2M\u6a21\u5f0f\uff0c\u90a3\u4e48 DMA \u7684\u4f20\u8f93\u5c06\u4f9d\u8d56\u4e8e DMA \u8bf7\u6c42\uff0c\u8fd9\u4e2a\u8bf7\u6c42\u53ef\u4ee5\u662f\u5916\u8bbe\u81ea\u5df1\u53d1\u8d77\uff0c\u4e5f\u53ef\u4ee5\u662f\u5176\u5b83\u5916\u8bbe\u4ea7\u751f\u3002DMA \u8bf7\u6c42\u53ea\u4f1a\u4f5c\u7528\u4e8e\u7279\u5b9a\u7684 DMA \u901a\u9053\uff0c\u5177\u4f53\u662f\u54ea\u4e2a\u5f97\u770b\u82af\u7247\u7684\u6570\u636e\u624b\u518c\u6216\u53c2\u8003\u624b\u518c\u3002\u901a\u5e38\u4e00\u4e2a DMA \u901a\u9053\u53ef\u4ee5\u5bf9\u5e94\u591a\u4e2a\u5916\u8bbe\uff0c\u5982\u4e0b\u6240\u793a\uff0cDMA0 \u7684\u901a\u90530 \u5bf9\u5e94\u7740 TIMER1\u3001TIMER3 \u548c ADC0\u3002\u4e00\u65e6 DMA \u901a\u9053\u4f7f\u80fd\uff0c\u8fd9\u4e9b\u5916\u8bbe\u90fd\u53ef\u4ee5\u53d1\u8d77 DMA \u8bf7\u6c42\uff0c\u89e6\u53d1 DMA \u4f20\u8f93\u3002\u8fd9\u4e9b\u5916\u8bbe\u90fd\u4f1a\u8bbe\u7f6e\u6709 DMA \u4f20\u8f93\u4f7f\u80fd\u5f00\u5173\uff0c\u4f4d\u4e8e\u5916\u8bbe\u5185\u90e8\uff0c\u590d\u4f4d\u540e\u5904\u4e8e\u5173\u95ed\u72b6\u6001\u3002<\/p>\n\n\n\n
\u6ce8\u610f\uff1a\u542f\u7528 DMA \u4f20\u8f93\u540e\uff0cDMA \u901a\u9053\u4e0b\u53ea\u80fd\u6709\u4e00\u4e2a\u5916\u8bbe\u53d1\u8d77 DMA \u8bf7\u6c42\uff0c\u5426\u5219\u4f1a\u5f15\u8d77\u4f20\u8f93\u9519\u8bef\u3002\u73b0\u5728\u4e00\u4e9b\u9ad8\u7aef\u5904\u7406\u5668\u7684 DMA \u63a7\u5236\u5668\u5185\u90e8\u6709\u5916\u8bbe\u9009\u62e9\u5668\uff0c\u4f8b\u5982 GD32F470 \u7cfb\u5217\u3001STM32F4 \u7cfb\u5217\uff0c\u53ef\u4ee5\u6307\u5b9a\u53ea\u63a5\u6536\u67d0\u4e00\u5916\u8bbe\u7684 DMA \u8bf7\u6c42\uff0c\u5c4f\u853d\u6389\u5176\u5b83\u5916\u8bbe\u7684 DMA \u8bf7\u6c42\u3002\u4f7f\u7528 GD32F470 \u7cfb\u5217\u6216 STM32F4 \u7cfb\u5217\u65f6\uff0c\u9700\u8981\u7279\u522b\u6ce8\u610f \uff0c\u5982\u679c DMA \u5f00\u542f\u4e86\u5355\u6b21\u6a21\u5f0f\uff0c\u4e00\u65e6 DMA \u505c\u6b62\u5de5\u4f5c\uff0c\u4e0e\u4e4b\u5173\u8054\u7684\u5916\u8bbe\u4e5f\u968f\u4e4b\u505c\u6b62\u5de5\u4f5c\uff0c\u6b64\u65f6\u5fc5\u987b\u8981\u590d\u4f4d\u5916\u8bbe\u548c DMA\uff0c\u5e76\u91cd\u65b0\u521d\u59cb\u5316\u624d\u80fd\u7ee7\u7eed\u5de5\u4f5c\u3002<\/mark><\/p>\n\n\n\n
DMA0<\/td>Channel\uff10<\/td>Channel\uff11<\/td>Channel\uff12<\/td>Channel\uff13<\/td>Channel\uff14<\/td>Channel5<\/td>Channel6<\/td><\/tr>
TIMER0<\/td>–<\/td>TIMER0_CH0<\/td>TIMER0_CH1<\/td>TIMER0_CH3
TIMER0_TG
TIMER0_CMT<\/td>		TIMER0_UP<\/td>TIMER0_CH2<\/td>–<\/td><\/tr>
TIMER1<\/td>TIMER1_CH2<\/td>TIMER1_UP<\/td>–<\/td>–<\/td>TIMER1_CH0<\/td>–<\/td>TIMER1_CH1
TIMER1_CH3<\/td><\/tr>
TIMER2<\/td>–<\/td>TIMER2_CH2<\/td>TIMER2_CH3
TIMER2_UP<\/td>		–<\/td>–<\/td>TIMER2_CH0
TIMER2_TG<\/td>		–<\/td><\/tr>
TIMER3<\/td>TIMER3_CH0<\/td>–<\/td>–<\/td>TIMER3_CH1<\/td>TIMER3_CH2<\/td>–<\/td>TIMER3_UP<\/td><\/tr>
ADC0<\/td>ADC0<\/td>–<\/td>–<\/td>–<\/td>–<\/td>–<\/td>–<\/td><\/tr>
SPI\uff0fI2S<\/td>–<\/td>SPI0_RX<\/td>SPI0_TX<\/td>SPI1\/I2S1_TX<\/td>SPI1\/I2S1_TX<\/td>–<\/td>–<\/td><\/tr>
USART<\/td>–<\/td>USART2_TX<\/td>USART2_RX<\/td>USART0_TX<\/td>USART0_RX<\/td>USART1_RX<\/td>USART1_TX<\/td><\/tr>
I2C<\/td>–<\/td>–<\/td>–<\/td>I2C1_TX<\/td>I2C1_RX<\/td>I2C0_TX<\/td>I2C0_RX<\/td><\/tr><\/tbody><\/table>
DMA0 \u5404\u901a\u9053\u8bf7\u6c42\u8868<\/figcaption><\/figure>\n\n\n\n
<\/span>\u4f7f\u7528\u5b9a\u65f6\u5668\u89e6\u53d1 DMA \u53d1\u9001\u4e32\u53e3\u6570\u636e<\/span><\/h2>\n\n\n\n
\u901a\u8fc7\u89c2\u5bdf DMA0 \u5404\u901a\u9053\u8bf7\u6c42\u8868\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6240\u6709\u901a\u9053\u90fd\u53ef\u4ee5\u901a\u8fc7\u5b9a\u65f6\u5668\u4ea7\u751f DMA \u8bf7\u6c42\u3002\u5b9a\u65f6\u5668\u4ea7\u751f\u4e2d\u65ad\u8bf7\u6c42\u6709\u51e0\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u66f4\u65b0\u4e8b\u4ef6\u4ea7\u751f\uff08TIMERx_UP\uff09\uff0c\u53ef\u4ee5\u4f7f\u7528\u89e6\u53d1\u4e8b\u4ef6\u4ea7\u751f\uff08TIMERx_TG\uff09\uff0c\u5b9a\u65f6\u5668\u7684\u89e6\u53d1\u4e8b\u4ef6\u4e0d\u4ec5\u53ef\u4ee5\u89e6\u53d1 ADC\u3001DAC \u8f6c\u6362\uff0c\u4e5f\u80fd\u7528\u4e8e\u4ea7\u751f DMA \u8bf7\u6c42\u3002\u5b9a\u65f6\u5668\u7684\u6bd4\u8f83\u8f93\u51fa\u4e8b\u4ef6\uff08TIMERx_CHx\uff09\u540c\u6837\u53ef\u4ee5\u7528\u4e8e DMA \u8bf7\u6c42\u3002TIMERx_CMT \u6682\u65f6\u4e0d\u77e5\u9053\u662f\u4ec0\u4e48\u4e8b\u4ef6\u3002\u901a\u5e38\u6211\u4eec\u4f1a\u9009\u62e9\u4f7f\u7528\u5b9a\u65f6\u7684\u66f4\u65b0\u4e8b\u4ef6\u6216\u89e6\u53d1\u4e8b\u4ef6\u4ea7\u751f DMA \u8bf7\u6c42\uff0c\u56e0\u4e3a\u6bd4\u8f83\u7b80\u5355\u3002<\/p>\n\n\n\n
\u524d\u8fb9\u8bf4\u8fc7\uff0cDMA \u8bf7\u6c42\u53ef\u4ee5\u662f\u5916\u8bbe\u81ea\u5df1\u53d1\u8d77\uff0c\u4e5f\u53ef\u4ee5\u662f\u5176\u5b83\u5916\u8bbe\u4ea7\u751f\uff0c\u6240\u4ee5\u6211\u4eec\u4e5f\u53ef\u4ee5\u7528 TIMER0 \u7684\u66f4\u65b0\u4e8b\u4ef6\u89e6\u53d1 DMA \u4f20\u8f93\uff0c\u53d1\u9001\u4e32\u53e3\u6570\u636e\u3002\u4f46\u4e3a\u4e86\u8bc1\u660e\u5176\u5b83\u901a\u9053\u4e5f\u53ef\u4ee5\u5c06\u6570\u636e\u53d1\u9001\u51fa\u53bb\uff0c\u6b64\u5904\u9009\u62e9\u4e86 TIMER1 \u7684\u66f4\u65b0\u4e8b\u4ef6\u3002\u5b9e\u9645\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u53ea\u8981\u63a7\u5236\u597d\u53d1\u9001\u95f4\u9699\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u7528\u7b49\u5f85 DMA \u4f20\u8f93\u5b8c\u6210\uff0c\u4ee5\u8282\u7701\u4e00\u4e9b CPU \u8d44\u6e90\u3002<\/p>\n\n\n\n
\/\/\u4e32\u53e3\u914d\u7f6e\u51fd\u6570\nstatic void ConfigUART(unsigned int bound)\n{\n  \/\/\u5c40\u90e8\u53d8\u91cf\n  dma_parameter_struct dma_init_struct;  \/\/DMA \u521d\u59cb\u5316\u7ed3\u6784\u4f53\n  timer_parameter_struct timer_initpara; \/\/\u5b9a\u65f6\u5668\u521d\u59cb\u5316\u7ed3\u6784\u4f53\n  \n  \/\/RCU \u4f7f\u80fd\n  rcu_periph_clock_enable(RCU_GPIOA);  \/\/\u4f7f\u80fd GPIOA \u65f6\u949f\n  rcu_periph_clock_enable(RCU_TIMER1); \/\/\u4f7f\u80fd TIMER1 \u7684\u65f6\u949f\n  rcu_periph_clock_enable(RCU_DMA0);   \/\/\u4f7f\u80fd DMA0 \u65f6\u949f\n\n  \/\/\u914d\u7f6eTX\u7684GPIO \n  gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9);\n\n  \/\/\u914d\u7f6eUSART\u7684\u53c2\u6570\n  rcu_periph_clock_enable(RCU_USART0);                            \/\/\u4f7f\u80fd\u4e32\u53e3\u65f6\u949f\n  usart_deinit(USART0);                                           \/\/\u6062\u590d\u9ed8\u8ba4\u503c\n  usart_baudrate_set(USART0, bound);                              \/\/\u8bbe\u7f6e\u6ce2\u7279\u7387\n  usart_stop_bit_set(USART0, USART_STB_1BIT);                     \/\/\u8bbe\u7f6e\u505c\u6b62\u4f4d\n  usart_word_length_set(USART0, USART_WL_8BIT);                   \/\/\u8bbe\u7f6e\u6570\u636e\u5b57\u957f\u5ea6\n  usart_parity_config(USART0, USART_PM_NONE);                     \/\/\u8bbe\u7f6e\u5947\u5076\u6821\u9a8c\u4f4d\n  usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);           \/\/\u4f7f\u80fd\u53d1\u9001\n  usart_enable(USART0);                                           \/\/\u4f7f\u80fd\u4e32\u53e3\n\n  \/\/\u914d\u7f6eTIMER1\n  timer_deinit(TIMER1);                                           \/\/\u8bbe\u7f6e TIMER1 \u53c2\u6570\u6062\u590d\u9ed8\u8ba4\u503c\n  timer_struct_para_init(&timer_initpara);                        \/\/\u521d\u59cb\u5316 timer_initpara\n  timer_initpara.prescaler         = 119;                         \/\/\u8bbe\u7f6e\u9884\u5206\u9891\u5668\u503c\uff0c1MHz\n  timer_initpara.counterdirection  = TIMER_COUNTER_UP;            \/\/\u8bbe\u7f6e\u5411\u4e0a\u8ba1\u6570\u6a21\u5f0f\n  timer_initpara.period            = 1 + (10000000 \/ bound);      \/\/\u8bbe\u7f6e\u81ea\u52a8\u91cd\u88c5\u8f7d\u503c\n  timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;            \/\/\u8bbe\u7f6e\u65f6\u949f\u5206\u5272\n  timer_init(TIMER1, &timer_initpara);                            \/\/\u6839\u636e\u53c2\u6570\u521d\u59cb\u5316\u5b9a\u65f6\u5668\n  timer_enable(TIMER1);                                           \/\/\u4f7f\u80fd\u5b9a\u65f6\u5668\n  timer_dma_enable(TIMER1, TIMER_DMA_UPD);                        \/\/\u5b9a\u65f6\u5668\u66f4\u65b0\u4e8b\u4ef6\u4f5c\u4e3a DMA \u89e6\u53d1\u6e90\n  \n  \/\/\u914d\u7f6eDMA\n  dma_deinit(DMA0, DMA_CH1);                                      \/\/\u590d\u4f4d DMA \u901a\u9053\n  dma_init_struct.direction    = DMA_MEMORY_TO_PERIPHERAL;        \/\/\u8bbe\u7f6e DMA \u6570\u636e\u4f20\u8f93\u65b9\u5411\n  dma_init_struct.memory_addr  = NULL;                            \/\/\u5185\u5b58\u5730\u5740\u8bbe\u7f6e\uff0c\u5148\u4e3a\u7a7a\n  dma_init_struct.memory_inc   = DMA_MEMORY_INCREASE_ENABLE;      \/\/\u5185\u5b58\u589e\u957f\u4f7f\u80fd\n  dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;           \/\/\u5185\u5b58\u6570\u636e\u4f4d\u6570\u8bbe\u7f6e\n  dma_init_struct.number       = 0;                               \/\/\u5185\u5b58\u6570\u636e\u91cf\u8bbe\u7f6e\uff0c\u5148\u4e3a 0\n  dma_init_struct.periph_addr  = (uint32_t)(&USART_DATA(USART0)); \/\/\u5916\u8bbe\u5730\u5740\u8bbe\u7f6e\n  dma_init_struct.periph_inc   = DMA_PERIPH_INCREASE_DISABLE;     \/\/\u5916\u8bbe\u5730\u5740\u589e\u957f\u5931\u80fd\n  dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;       \/\/\u5916\u8bbe\u6570\u636e\u4f4d\u6570\u8bbe\u7f6e\n  dma_init_struct.priority     = DMA_PRIORITY_MEDIUM;             \/\/\u4f18\u5148\u7ea7\u8bbe\u7f6e\n  dma_init(DMA0, DMA_CH1, &dma_init_struct);                      \/\/\u6839\u636e\u53c2\u6570\u521d\u59cb\u5316\n  dma_circulation_disable(DMA0, DMA_CH1);                         \/\/\u5355\u6b21\u4f20\u8f93\n  dma_memory_to_memory_disable(DMA0, DMA_CH1);                    \/\/\u7981\u7528\u5185\u5b58\u5230\u5185\u5b58\n  \n  \/\/\u5148\u7981\u7528 DMA\n  dma_channel_disable(DMA0, DMA_CH1);\n}\n\n\/\/\u4e32\u53e3\u53d1\u9001\u51fd\u6570\nunsigned int WriteUART0(unsigned char *pBuf, unsigned int len)\n{\n  timer_disable(TIMER1);                                    \/\/\u7981\u7528\u89e6\u53d1\u5b9a\u65f6\u5668\n  timer_counter_value_config(TIMER1, 0);                    \/\/\u5b9a\u65f6\u5668\u8ba1\u6570\u6e05\u96f6\n  dma_channel_disable(DMA0, DMA_CH1);                       \/\/\u7981\u7528DMA\n  dma_memory_address_config(DMA0, DMA_CH1, (uint32_t)pBuf); \/\/\u8bbe\u7f6e\u5185\u5b58\u5730\u5740\n  dma_transfer_number_config(DMA0, DMA_CH1, (uint32_t)len); \/\/\u8bbe\u7f6e\u6570\u636e\u91cf\n  dma_channel_enable(DMA0, DMA_CH1);                        \/\/\u5f00\u542fDMA\u4f20\u8f93\n  timer_enable(TIMER1);                                     \/\/\u4f7f\u80fd\u5b9a\u65f6\u5668\n  \n  \/\/\u7b49\u5f85\u4f20\u8f93\u5b8c\u6210\n  while(RESET == dma_flag_get(DMA0, DMA_CH1, DMA_FLAG_FTF)){}\n\n  \/\/\u8fd4\u56de\u5b9e\u9645\u5199\u5165\u6570\u636e\u7684\u4e2a\u6570\n  return len;\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u4e2a\u9a71\u52a8\u7684\u7cbe\u9ad3\u5728\u4e8e\u4f7f\u7528\u5b9a\u65f6\u5668\u4ee5\u56fa\u5b9a\u7684\u9891\u7387\u4ea7\u751f DMA \u8bf7\u6c42\uff0c\u5c06\u9700\u8981\u53d1\u9001\u7684\u6570\u636e\u5199\u5230\u4e32\u53e3\u6570\u636e\u5bc4\u5b58\u5668\uff0c\u4ee5\u8fbe\u5230 DMA \u53d1\u9001\u4e32\u53e3\u6570\u636e\u7684\u6548\u679c\uff0c\u65e2\u907f\u514d\u4e86 M2M \u6a21\u5f0f\u4e0b\u4f20\u8f93\u901f\u5ea6\u8fc7\u5feb\u7684\u5c34\u5c2c\uff0c\u4e5f\u4e0d\u7528 CPU \u8fc7\u591a\u7684\u5e72\u9884\u3002\u540c\u6837\u7684\uff0cGD32F303ZET6 \u7684 UART4 \u4e0d\u652f\u6301 DMA\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u4e00\u4e2a\u5b9a\u65f6\u5668\u4ea7\u751f DMA \u8bf7\u6c42\uff0c\u8fbe\u5230 DMA \u53d1\u9001\u4e32\u53e3\u6570\u636e\u7684\u76ee\u7684\u3002<\/p>\n\n\n\n
\u7c7b\u4f3c\u7684\uff0c\u4f7f\u7528\u547c\u5438\u706f\u9a71\u52a8\u65f6\uff0c\u6211\u4eec\u9700\u8981\u4ee5\u4e00\u5b9a\u7684\u5468\u671f\u53bb\u4fee\u6539\u5b9a\u65f6\u5668 PWM \u7684\u5360\u7a7a\u6bd4\uff0c\u8fd9\u90e8\u5206\u5de5\u4f5c\u4e5f\u53ef\u4ee5\u8ba9 DMA \u81ea\u52a8\u5b8c\u6210\u3002\u6211\u4eec\u7528 DMA \u4ee5\u540c\u6837\u7684\u9891\u7387\u66f4\u65b0\u5b9a\u65f6\u5668\u901a\u9053 x \u6355\u83b7\/\u6bd4\u8f83\u5bc4\u5b58\u5668 (TIMERx_CHxCV)\uff0c\u5373\u53ef\u5b9e\u73b0\u5168\u81ea\u52a8\u7684\u547c\u5438\u706f\u3002\u5982\u679c GPIO \u652f\u6301\u7aef\u53e3\u4f4d\u64cd\u4f5c\u5bc4\u5b58\u5668\uff08GPIOx_BOP\uff09\uff0c\u4f7f\u7528 DMA \u4ee5\u4e00\u5b9a\u7684\u9891\u7387\u66f4\u65b0\u8be5\u5bc4\u5b58\u5668\uff0c\u76f4\u63a5\u64cd\u4f5c\u5f15\u811a\u8f93\u51fa\u7535\u5e73\uff0c\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u547c\u5438\u706f\u7684\u6548\u679c\u3002<\/p>\n\n\n\n
<\/span>DMA \u505a\u5185\u5b58\u62f7\u8d1d<\/span><\/h2>\n\n\n\n
\u524d\u8fb9\u4ecb\u7ecd\u4e86\uff0cDMA \u8fd8\u6709\u53e6\u4e00\u79cd\u5de5\u4f5c\u6a21\u5f0f\uff0c\u5373\u5185\u5b58\u5230\u5185\u5b58\u6a21\u5f0f\uff0c\u5e38\u5e38\u7528\u4e8e\u5185\u5b58\u62f7\u8d1d\uff0c\u5982\u4e0b\u5217\u4ee3\u7801\u8868\u793a\u3002\u5982\u679c\u6e90\u7f13\u51b2\u533a\u3001\u76ee\u7684\u7f13\u51b2\u533a\u7684\u9996\u5730\u5740\u662f4\u5b57\u8282\u5bf9\u9f50\uff0c\u4e14\u4f20\u8f93\u6570\u636e\u91cf\u4e5f\u4e3a4\u5b57\u8282\u5bf9\u9f50\u7684\u8bdd\uff0c\u53ef\u4ee5\u5c06\u5916\u8bbe\u6570\u636e\u4f4d\u5bbd\u3001\u5185\u5b58\u6570\u636e\u4f4d\u5bbd\u5747\u8bbe\u6210 32 \u4f4d\uff0c\u5145\u5206\u5229\u7528 32 \u4f4d\u603b\u7ebf\u7684\u4f18\u52bf\uff0c\u53ef\u4ee5\u5c06\u901f\u5ea6\u63d0\u5347 4 \u500d\uff1b\u56e0\u4e3a\u662f\u6309\u5b57\u4f20\u8f93\u7684\uff0c\u6240\u4ee5 DMA \u4f20\u8f93\u7684\u6570\u636e\u91cf\u8981\u9664\u4ee5 4\u3002<\/p>\n\n\n\n
\u6ce8\u610f\uff1aDMA \u6bcf\u4e2a\u901a\u9053\u90fd\u5177\u6709 M2M \u529f\u80fd\uff0c\u53ea\u8981\u8fd9\u4e2a\u901a\u9053\u6ca1\u6709\u88ab\u5360\u7528\uff0c\u5c31\u53ef\u4ee5\u7528\u4e8e\u5185\u5b58\u62f7\u8d1d\u3002<\/p>\n\n\n\n
\/\/\u4f7f\u7528 DMA \u505a\u5185\u5b58\u62f7\u8d1d\nvoid CopyWithDMA(unsigned char* source, unsigned char* target, unsigned int len)\n{\n  \/\/DMA \u521d\u59cb\u5316\u7ed3\u6784\u4f53\n  dma_parameter_struct dma_init_struct;\n  \n  \/\/\u914d\u7f6e DMA\n  rcu_periph_clock_enable(RCU_DMA0);                          \/\/\u4f7f\u80fd DMA \u65f6\u949f\n  dma_deinit(DMA0, DMA_CH0);                                  \/\/\u590d\u4f4d DMA \u901a\u9053\n  dma_init_struct.direction    = DMA_PERIPHERAL_TO_MEMORY;    \/\/\u8bbe\u7f6e DMA \u6570\u636e\u4f20\u8f93\u65b9\u5411\uff0c\u5916\u8bbe\u5230\u5185\u5b58\n  dma_init_struct.memory_addr  = (uint32_t)target;            \/\/\u5185\u5b58\u5730\u5740\u8bbe\u7f6e\n  dma_init_struct.memory_inc   = DMA_MEMORY_INCREASE_ENABLE;  \/\/\u4f7f\u80fd\u5185\u5b58\u5730\u5740\u589e\u6da8\n  dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;       \/\/\u5185\u5b58\u6570\u636e\u4f4d\u6570\u8bbe\u7f6e\n  dma_init_struct.number       = len;                         \/\/\u5185\u5b58\u6570\u636e\u91cf\u8bbe\u7f6e\n  dma_init_struct.periph_addr  = (uint32_t)source;            \/\/\u5916\u8bbe\u5730\u5740\u8bbe\u7f6e\n  dma_init_struct.periph_inc   = DMA_PERIPH_INCREASE_ENABLE;  \/\/\u4f7f\u80fd\u5916\u8bbe\u5730\u5740\u589e\u6da8\n  dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;   \/\/\u5916\u8bbe\u6570\u636e\u4f4d\u6570\u8bbe\u7f6e\n  dma_init_struct.priority     = DMA_PRIORITY_MEDIUM;         \/\/\u4f18\u5148\u7ea7\u8bbe\u7f6e\n  dma_init(DMA0, DMA_CH0, &dma_init_struct);                  \/\/\u6839\u636e\u53c2\u6570\u521d\u59cb\u5316\n  dma_circulation_disable(DMA0, DMA_CH0);                     \/\/\u5355\u6b21\u4f20\u8f93\n  dma_memory_to_memory_enable(DMA0, DMA_CH0);                 \/\/\u4f7f\u80fd\u5185\u5b58\u5230\u5185\u5b58\u6a21\u5f0f\n\n  \/\/\u5f00\u542f DMA \u4f20\u8f93\n  dma_channel_enable(DMA0, DMA_CH0);\n  \n  \/\/\u7b49\u5f85\u4f20\u8f93\u5b8c\u6210\n  while(RESET == dma_flag_get(DMA0, DMA_CH0, DMA_FLAG_FTF)){}\n}<\/code><\/pre>\n\n\n\n
\u9644\u4e0a\u6d4b\u8bd5\u4ee3\u7801<\/p>\n\n\n\n
int main(void)\n{\n  static u8 s_arrSourceBuf[1024];\n  static u8 s_arrTargetBuf[1024];\n  unsigned int i, error;\n  \n  \/\/\u521d\u59cb\u5316\u4e32\u53e3\n  InitUART0(115200);\n  \n  \/\/\u521d\u59cb\u5316\u6e90\u7f13\u51b2\u533a\u548c\u76ee\u7684\u7f13\u51b2\u533a\n  for(i = 0; i < 1024; i++)\n  {\n    s_arrSourceBuf[i] = (u8)i;\n    s_arrTargetBuf[i] = 0;\n  }\n  \n  \/\/\u5185\u5b58\u62f7\u8d1d\n  CopyWithDMA(s_arrSourceBuf, s_arrTargetBuf, 1024);\n  \n  \/\/\u9a8c\u8bc1\n  error = 0;\n  for(i = 0; i < 1024; i++)\n  {\n    if(s_arrTargetBuf[i] != s_arrSourceBuf[i])\n    {\n      error = 1;\n      break;\n    }\n  }\n  \n  \/\/\u9a8c\u8bc1\u6210\u529f\n  if(0 == error)\n  {\n    printf(\"Copy ok\\r\\n\");\n  }\n  else\n  {\n    printf(\"Fail to copy\\r\\n\");\n  }\n  \n  \/\/\u4e3b\u5faa\u73af\n  while(1)\n  {\n    \n  }\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u8bb0\u5f55\u4e00\u4e9b DMA \u5b66\u4e60\u8fc7\u7a0b\u4e2d\u7684\u5fc3\u5f97\u4f53\u4f1a\uff0c\u9002\u7528\u4e8e GD32 \u6216 STM32 \u5e73\u53f0\u3002\u4ece\u65b0\u7684\u89c6\u89d2\u53bb\u7406\u89e3 DMA \u4e2d\u7684\u5916\u8bbe\u5730\u5740\u548c\u5185\u5b58\u5730\u5740\uff0c\u5e76\u8be6\u7ec6\u5206\u6790\u4e86\u5916\u8bbe\u662f\u5982\u4f55\u4e0e DMA \u7ed1\u5b9a\uff0c\u534f\u540c\u8fd0\u884c\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/381"}],"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=381"}],"version-history":[{"count":46,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/381\/revisions"}],"predecessor-version":[{"id":2180,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=\/wp\/v2\/posts\/381\/revisions\/2180"}],"wp:attachment":[{"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=381"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=381"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.huangrongzhen.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=381"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}