Using the SDRAM Controller with Qsys

Hello all,

This code has been tested with the BeMicroMax and it will be help you to test your SDRAM memory :

We assume that you are set your memory controller with QSYS :

In my case the memory controller is mapped at the address : (0x800000)# define SDRAM_BASE (0x800000)# define SDRAM_BASE_MUX (SDRAM_BASE + 0x2000) /** Offset for the exception */

/** Variables */

uint32_t u32AddrSram = 0;

uint16_t u16Value = 0;

uint16_t u16ReadSramValue = 0;

/** example for write and read only one byte at the time in the sram */

for( u32AddrSram = 0; u32AddrSram< 100 ; u32addrsram += 0x08)

{

/** Write Data */

alt_printf("\n*** SDRAM WRITE[%x] VALUE = %x \n\r ", (SDRAM_BASE_MUX + u32AddrSram) , (uint8_t)(u16Value));

iowr_8direct(SDRAM_BASE_MUX, (uint16_t)u32AddrSram, (uint8_t)u16Value);

/** Read Data */

u16ReadSramValue = iord_8direct(SDRAM_BASE_MUX, u32AddrSram);

alt_printf("\n*** SDRAM READ[%x] VALUE = %x \n\r ", (SDRAM_BASE_MUX + u32AddrSram), u16ReadSramValue);

/** Change the value */

u16Value++;

}

/** example for write and read only 2bytes at the time in the sram */

u16Value = 0xA000;

for( u32AddrSram = 0; u32AddrSram< 100 ; u32addrsram += 0x10)

{

/** Write Data */

alt_printf("\n*** SDRAM WRITE[%x] VALUE = %x \n\r ", (SDRAM_BASE_MUX + u32AddrSram) , (uint16_t)(u16Value));

iowr_16direct(SDRAM_BASE_MUX, (uint16_t)u32AddrSram, (uint16_t)u16Value);

/** Read Data */

u16ReadSramValue = iord_16direct(SDRAM_BASE_MUX, u32AddrSram);

alt_printf("\n*** SDRAM READ[%x] VALUE = %x \n\r ", (SDRAM_BASE_MUX + u32AddrSram), u16ReadSramValue);

/** Change the value */

u16Value++;

}

/*** Result for Byte */

*** SDRAM WRITE[802000] VALUE = 0

*** SDRAM READ[802000] VALUE = 0

*** SDRAM WRITE[802008] VALUE = 1

*** SDRAM READ[802008] VALUE = 1

*** SDRAM WRITE[802010] VALUE = 2

*** SDRAM READ[802010] VALUE = 2

*** SDRAM WRITE[802018] VALUE = 3

*** SDRAM READ[802018] VALUE = 3

*** SDRAM WRITE[802020] VALUE = 4

*** SDRAM READ[802020] VALUE = 4

*** SDRAM WRITE[802028] VALUE = 5

*** SDRAM READ[802028] VALUE = 5

*** SDRAM WRITE[802030] VALUE = 6

*** SDRAM READ[802030] VALUE = 6

*** SDRAM WRITE[802038] VALUE = 7

*** SDRAM READ[802038] VALUE = 7

*** SDRAM WRITE[802040] VALUE = 8

*** SDRAM READ[802040] VALUE = 8

*** SDRAM WRITE[802048] VALUE = 9

*** SDRAM READ[802048] VALUE = 9

*** SDRAM WRITE[802050] VALUE = a

*** SDRAM READ[802050] VALUE = a

*** SDRAM WRITE[802058] VALUE = b

*** SDRAM READ[802058] VALUE = b

*** SDRAM WRITE[802060] VALUE = c

*** SDRAM READ[802060] VALUE = c

/** result for 2bytes read */

*** SDRAM WRITE[802000] VALUE = a000

*** SDRAM READ[802000] VALUE = a000

*** SDRAM WRITE[802010] VALUE = a001

*** SDRAM READ[802010] VALUE = a001

*** SDRAM WRITE[802020] VALUE = a002

*** SDRAM READ[802020] VALUE = a002

*** SDRAM WRITE[802030] VALUE = a003

*** SDRAM READ[802030] VALUE = a003

*** SDRAM WRITE[802040] VALUE = a004

*** SDRAM READ[802040] VALUE = a004

*** SDRAM WRITE[802050] VALUE = a005

*** SDRAM READ[802050] VALUE = a005

*** SDRAM WRITE[802060] VALUE = a006

*** SDRAM READ[802060] VALUE = a006