AT45DB161D Help !!!!!

[Sterngleiter]

Hallo,
can someone please help me how can I use this block
" http://www.adestotech.com/sites/default/files/datasheets/doc3500.pdf ".
I'd love to write in and read some data. I can not really see anything from the data sheets. SPI is known to me. I would be happy to see code examples.

[temtronic]

First obvious place to start is the datasheet....

..what PIC have you decided on using ??

Second, try 'googling' and see what relevent 'hits' are found.

Third, what 'platform' have you done? Wirewrap,PCB,breadboard,???

we need more info....

jay

[Sterngleiter]

I use PIC18f8622, Platform is PCWHD Vers.4.134, Googling no success, The Application Note is an example in C for AVR. I understand some of it. But very much unclear how the reading of buffer with. As I understand from the data sheet, the data from Page X to buffer is loaded then it is read from right?

[milan.rajik2013]

[PCM programmer]

[milan.rajik2013]

[PCM programmer]

What I meant was, you both would learn a lot more if you setup a
hardware board and experimented with the CCS dataflash driver,
and if you wrote the PIC code to talk to the driver. You would learn
more than if we gave you code (assuming we have any to give).

[Sterngleiter]

output_low(pin_c3);
spi_xfer(SPI_1,0xd7,8);
output_high(pin_c3);
delay_ms(5);
output_low(pin_c3);
spi_xfer(0x84); //opcode
spi_xfer(0x00); //byt 1 page
spi_xfer(0x00); //byt 2 page
spi_xfer(0x01); //buffer adresse
spi_xfer(0x04); //data
output_high(pin_c3);
delay_cycles(1);
output_low(pin_c3);
spi_xfer(0x84); //opcode
spi_xfer(0x00); //byt 1 page
spi_xfer(0x00); //byt 2 page
spi_xfer(0x02); //buffer adresse
spi_xfer(0x05); //data
output_high(pin_c3);

Earlier, I tried to write some data in the buffer, and below I try to read from the buffer out. I think it does not work out right the second is worth several times the first ausgelesn and not what's wrong here

void lesen(void)
{
test[1]=0;
test[0]=0;
output_low(pin_c3);
spi_xfer(0xd7);
output_high(pin_c3);

delay_cycles(10);
output_low(pin_c3);
spi_xfer(SPI_1,0x54,8);
spi_xfer(SPI_1,0x00,8); //byt 1 page
spi_xfer(SPI_1,0x00,8);
spi_xfer(SPI_1,0x01,8);
delay_cycles(5);

test[0]=spi_xfer(2);
test[0]<<=8;
test[0] &=0xFF00;
test[0] +=spi_xfer(2);
delay_cycles(5);
output_high(pin_c3);

delay_cycles(10);
output_low(pin_c3);
spi_xfer(SPI_1,0x54,8);
spi_xfer(SPI_1,0x00,8); //byt 1 page
spi_xfer(SPI_1,0x02,8);
spi_xfer(SPI_1,0x02,8);
delay_cycles(5);

test[1]=spi_xfer(2);
test[1]<<=8;
test[1] &=0xFF00;
test[1] +=spi_xfer(2);
delay_cycles(5);
output_high(pin_c3);
delay_ms(200);
}

[temtronic]

I have a very hard time believing you can get a 3 volt flash memory chip to interface correctly with a 5volt PIC.
Seems all the 'new' stuff is 3 volts....so I downloaded that spec sheet.

Something gnaws at me that the SPI port is ST rated.
Perhaps you can show us which pins you're using for SPI ?

cheers
jay

[temtronic]

OK, curiosity got the better of me, and I downloaded the PIC datasheet.
Just as I suspected, the SPI pins are ST type and require a Vin of .8*Vdd.
So .8*5 is 4.0Volts which you'll never,ever get out of a 3volt memory device.

When hardware is incorrect, software cannot work.

hth
jay

[Sterngleiter]

#USE SPI (MASTER, CLK=PIN_B6, DI=PIN_B4, DO=PIN_C7, MODE=3, BITS=8, STREAM=SPI_1, MSB_FIRST)

Vdd is 3.3 V, 0.8 * 3.3 = 2.64V

[temtronic]

Are you saying you've got an 18F8622 to actually runs right on '3 volts'?

MCHP spec says 4.2 is the minimum for it.

[Sterngleiter]

I use to test purposes with the PIC16F690 throttled Vdd, it works at a graphic display (SPI)

[temtronic]

Glad you cleared that up, cause the '8622 won't run that low ! The '690 will, but at less than 10MHz.

[Sterngleiter]

"PIC16F690" with internal oscillator 4Mhz, do you think it's not running