any sample code for external memory interface?

[hg-chen]

Posted on December 05, 2007 at 22:55

any sample code for external memory interface?

[mark9]

Posted on May 17, 2011 at 09:48

#ifndef MINIMAL_BSP

// EMI = External Memory Interface

void BSP_EMI_Config(void) {

EMI_DeInit();

#if BOARD == BOARD_SP_SC

// configure CS0 and CS1

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;

GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;

GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt3;

GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_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_IPConnected = GPIO_IPConnected_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

// SCU_EMIALEConfig( , ); not used

// configure EMI

EMI_InitTypeDef eMI_InitStruct;

EMI_StructInit(&eMI_InitStruct);

eMI_InitStruct.EMI_Bank_WSTRD = 4; // read wait states. determined empirically

eMI_InitStruct.EMI_Bank_WSTWR = 1; // write wait state. determined empirically

// we have 64KB on banks 0 and 1 each, so configure both

EMI_Init(EMI_Bank0, &eMI_InitStruct);

EMI_Init(EMI_Bank1, &eMI_InitStruct);

#endif

}

uint32_t BSP_SRAM_MemoryTest(void) {

#if BOARD == BOARD_SP_SC

// test. bank 0 is at 0x3800.0000 and bank1 is at 0x3C00.0000

// test low bits

uint8_t* bank0;

uint8_t* bank1;

bank0 = (uint8_t*) 0x38000000;

bank1 = (uint8_t*) 0x3C000000;

uint32_t errCount[2] = {0,0};

// write pattern A

for(int i=0;i<0x10000;i++) {

bank0[i] = 0xAA;

bank1[i] = 0x55;

}

for(int i=0;i<0x10000;i++) {

if (bank0[i] != 0xAA) {

errCount[0]++;

}

if (bank1[i] != 0x55) {

errCount[1]++;

}

}

// write pattern B

for(int i=0;i<0x10000;i++) {

bank0[i] = 0x55;

bank1[i] = 0xAA;

}

for(int i=0;i<0x10000;i++) {

if (bank0[i] != 0x55) {

errCount[0]++;

}

if (bank1[i] != 0xAA) {

errCount[1]++;

}

}

// write pattern C

for(int i=0;i<0x10000;i++) {

bank0[i] = (i & 0xFF);

bank1[i] = ~(i & 0xFF);

}

for(int i=0;i<0x10000;i++) {

if (bank0[i] != (i & 0xFF)) {

errCount[0]++;

}

if (bank1[i] != (uint8_t) ~(i & 0xFF)) {

errCount[1]++;

}

}

// write pattern D

for(int i=0;i<0x10000;i++) {

bank0[i] = ~(i & 0xFF);

bank1[i] = (i & 0xFF);

}

for(int i=0;i<0x10000;i++) {

if (bank1[i] != (i & 0xFF)) {

errCount[0]++;

}

if (bank0[i] != (uint8_t) ~(i & 0xFF)) {

errCount[1]++;

}

}

return errCount[0]+errCount[1];

#else

return 99999;

#endif

}

[hg-chen]

Posted on May 17, 2011 at 09:48

Is there any sample code for running external memory interface?

[hg-chen]

Posted on May 17, 2011 at 09:48

thanks!

How about setup STR912 EMI ( External Memory Interface) that I

would like to load 2 Mega byte code and use 2 Mega byte data ( means 4

Mega byte EMI). Is there any sample code that I can reference?