Posted on December 16, 2008 at 14:27I need to address the ext. memory (21e00000) in ST91x. I have configured the EMI as follow but still failed~ can you help me?
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 |GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt3;
GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable;
GPIO_Init (GPIO5, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2;
GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable;
GPIO_Init (GPIO7, &GPIO_InitStructure);
GPIO_Init (GPIO8, &GPIO_InitStructure);
GPIO_Init (GPIO9, &GPIO_InitStructure);
// those bastards. this one pin out of 24 is on a different alt bus
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt3;
GPIO_Init (GPIO7, &GPIO_InitStructure);
// configure SCU
SCU_EMIModeConfig(SCU_EMI_DEMUX);
SCU_EMIBCLKDivisorConfig(SCU_EMIBCLK_Div1); // or SCU_EMIBCLK_Div1;
SCU->GPIOEMI = 1; // enable ports 8 & 9 for EMI
GPIO_EMIConfig( ENABLE );
/* Enable EMI clock */
EMI_DeInit();
EMI_StructInit( &eMI_InitStruct );
eMI_InitStruct.EMI_Bank_MemWidth = EMI_Width_HalfWord;
eMI_InitStruct.EMI_Bank_IDCY =0x6;
eMI_InitStruct.EMI_Bank_WSTRD =0x6;
eMI_InitStruct.EMI_Bank_WSTWR =0x6;
eMI_InitStruct.EMI_Bank_WSTROEN=0x6;
eMI_InitStruct.EMI_Bank_WSTWEN=0x08;
eMI_InitStruct.EMI_Bank_MemWidth=EMI_Width_HalfWord;
EMI_Init( EMI_Bank1, &eMI_InitStruct );
