Posted on May 17, 2011 at 09:58Hi all,
We have a 4mb (256k x 16) SRAM connected to the EMI as 16bit at CS0, we can read & write up to A15, but writes to A16-A17 do not work, although we can see activity on A16-A17, we are unsure if this is at the correct time.
Any Ideas??
Here is the setup:
/* GPIO7 Configuration */
GPIO_DeInit(GPIO7);
GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull;
GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2 ;
GPIO_Init (GPIO7, &GPIO_InitStructure);
/* GPIO0 Configuration CS0 & 1 & 2*/
GPIO_DeInit(GPIO0);
GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6;
GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull;
GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2;
GPIO_Init (GPIO0, &GPIO_InitStructure);
/***** EMI Setup *****/
/* Enable the clock for EMI*/
SCU_AHBPeriphClockConfig(__EMI | __EMI_MEM_CLK, ENABLE);
SCU_AHBPeriphReset(__EMI | __EMI_MEM_CLK,DISABLE);
/*BCLK=96Mhz*/
SCU_EMIBCLKDivisorConfig(SCU_EMIBCLK_Div1);
/*Enable the Mux mode*/
SCU_EMIModeConfig(SCU_EMI_MUX);
/*ALE length and polarity definition*/
SCU_EMIALEConfig(SCU_EMIALE_LEN1, SCU_EMIALE_POLHigh);
/* EMI Address/Data GPIO Setup */
GPIO_EMIConfig(ENABLE);
/* EMI default configuration : Reset configuration*/
EMI_DeInit();
//Bank 0 CS0
EMI_StructInit(&EMI_InitStruct);
/* Number of bus turnaround cycles added between read and write accesses.*/
EMI_InitStruct.EMI_Bank_IDCY = 0x3;
/* Number of wait states for read accesses*/
EMI_InitStruct.EMI_Bank_WSTRD = 0x1f;
/* Number of wait states for write accesses*/
EMI_InitStruct.EMI_Bank_WSTWR = 0x1f;
/*Output enable assertion delay from chip select assertion*/
EMI_InitStruct.EMI_Bank_WSTROEN = 0x3;
/*Write enable assertion delay from chip select assertion*/
EMI_InitStruct.EMI_Bank_WSTWEN = 0x3;
/*This member Controls the memory width*/
EMI_InitStruct.EMI_Bank_MemWidth = EMI_Width_HalfWord;
/*Write protection feature */
EMI_InitStruct.EMI_Bank_WriteProtection = EMI_Bank_NonWriteProtect;
/*Use Bank0 (CS0)*/
EMI_Init( EMI_Bank0, &EMI_InitStruct);
