FSMC总线设置

只看该作者 · 2024-5-14 09:35

各位，使用STM32F405读取挂在FSMC总线上的14位ADC，  设置位宽为16位，结果每次读取总线都会发出两次片选和读使能信号，不知为何，敬请指教！       readWriteTiming.FSMC_AddressSetupTime = 0x02;    //µØÖ·½¨Á¢Ê±¼ä£¨ADDSET£©Îª16¸öHCLK 1/168M=6ns*16=96ns
readWriteTiming.FSMC_AddressHoldTime = 0x00;    //µØÖ·±£³ÖÊ±¼ä£¨ADDHLD£©Ä£Ê½AÎ´ÓÃµ½
readWriteTiming.FSMC_DataSetupTime = 0x03; //Êý¾Ý±£´æÊ±¼äÎª60¸öHCLK =6*60=360ns
readWriteTiming.FSMC_BusTurnAroundDuration = 0x00;
readWriteTiming.FSMC_CLKDivision = 0x00;
readWriteTiming.FSMC_DataLatency = 0x00;
readWriteTiming.FSMC_AccessMode = FSMC_AccessMode_A;    //Ä£Ê½A

      FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM4;//  ÕâÀïÎÒÃÇÊ¹ÓÃNE4 £¬Ò²¾Í¶ÔÓ¦BTCR[6],[7]¡£
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable; // ²»¸´ÓÃÊý¾ÝµØÖ·
FSMC_NORSRAMInitStructure.FSMC_MemoryType =FSMC_MemoryType_SRAM;// FSMC_MemoryType_SRAM;  //SRAM
FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;//´æ´¢Æ÷Êý¾Ý¿í¶ÈÎª16bit
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode =FSMC_BurstAccessMode_Disable;// FSMC_BurstAccessMode_Disable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait=FSMC_AsynchronousWait_Disable;
FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable; //  ´æ´¢Æ÷Ð´Ê¹ÄÜ
FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable; // ¶ÁÐ´Ê¹ÓÃ²»Í¬µÄÊ±Ðò
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &readWriteTiming; //¶ÁÐ´Ê±Ðò
FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &readWriteTiming;  //Ð´Ê±Ðò

FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);  //³õÊ¼»¯FSMCÅäÖÃ

FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM4, ENABLE);  // Ê¹ÄÜBANK1