Hi,
I'm working on a custom board which uses LPC1857 cortex-M3 processor. The SDRAM AS4C16M16SA (4M word x 16-bit x 4-bank) connected to DYCS1. The SDRAM initliazation looks ok on the scope. Also SDRAM write seems to be ok. Below in the SDRAM/Controller configuration and intialization code attached.
While reading a byte until address 0x30000000 to 0x30000003 everything seems ok and I think it is because of the buffer. After that porocessor locks up and goes for infinite read. I would appreciate if anybody could help with their ideas.
testing method:
#define SDRAM_BASE_ADDR (0x30000000 | 0x3)
//write
add = (uint8_t *)(SDRAM_BASE_ADDR );
for (i=0;i<66;i++)
{
*add = num1 ;
//num1++;
add++;
}
blink(led1);
//read
add = (uint8_t *)(SDRAM_BASE_ADDR );
for (i=0;i<1i++)
{
val1[i] = *add;
add++;
}
while (1) {blink(led2);}
-Using Keil MDK Pro and Jlink debug adapter
Thanks,
Sanjay
Original Attachment has been moved to: sdram-init.txt.zip
