Posted on December 06, 2016 at 16:48Hi, I have a custom hardware dev board which includes an SDRAM (MT48LC4M16A2), NAND Flash and a STM32F429. The schematic for this board is identical to other commercial dev boards that have the same memory configuration.
Here is a my test code :
#define SDRAM_Write8(address, value) (*(__IO uint8_t *) (SDRAM_BANK_ADDR + (address)) = (value))
#define SDRAM_Read8(address) (*(__IO uint8_t *) (SDRAM_BANK_ADDR + (address)))
SDRAM_Init(); //Same as example provided by st demo examples
//Init reading buffer
for(i = 0; i < 100; i++)
{
u8TempBuff[i] = 0x00;
}
// Erase sdram
for(i = 0; i < 100;i++)
{
SDRAM_Write8(i, (uint8_t)0x00);
}
//Write Data
for(i = 0; i < 100;i++)
{
SDRAM_Write8(i, (uint8_t)0xaa);
}
//Read data
for(i = 0; i < 100; i++)
{
u8TempBuff[i] = SDRAM_Read8(i);
}
//Print read data
for(i = 0; i < 1000; i++)
{
TRACE_INFO('%x-',u8TempBuff[i]);
}
while(true);
Every time I run the program I get this result:
0-aa-0-aa-0-aa-0-aa-0-aa-0-aa-0-aa-0-aa-0-aa-0-aa-20-aa-a2-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-aa-...
I can't figure out why some first bytes are not written correctly? Any help with this problem ?
