Posted on September 05, 2008 at 07:02I have a problem with Bank 0 EMI. I try to use 8-bit width bus on Bank 0.
I write following code:
{
u16 data;
...
// Initialize Pin 0 Port 2 to Alternate function
GPIO_Config(GPIO2, 0x0001, GPIO_AF_PP); //0x000F
// Initialize the EMI bank 0: enable, 2 wait states, 8-bit wide external
memory device
EMI_Config(0, EMI_ENABLE | EMI_WAITSTATE(10) | EMI_SIZE_8)
// Write data to the external memory
*(u32*)0x60000000 = 0x1234; // write 1234 in bank 0
// Read data from the external memory
data = *(u16*)0x60000000; // read from bank 0
...
}
The problem is that i have only one read and write strobe. Data are send on 16-bit width data bus. When I read EMI_BCON0 register, bits B_SIZE[1:0] are still 0x01. Proccessor dosen't change data bus width from 16-bit to 8-bit. Why does it happend? What I did wrong? Did someone have such problem with bank 0?
Bank 0 can be 8-bit access?? I have pin BOOTEN tied to ground.
