Driver /help required for atmel AT45DB041B

[rob]

Hi all
I am having little or no response from the chip. I am using the 8 pin device and currently cant even read the status so this makes the driver debugging very difficult. I have interfaced directly to an 16f877 using the hardware SP interface.
So if anybody has a driver i can share or some pointers please help.

thanks in advance
regards
Rob Sterling
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This message was ported from CCS's old forum
Original Post ID: 11145

[Joe Heinrich]

:=Hi all
:=I am having little or no response from the chip. I am using the 8 pin device and currently cant even read the status so this makes the driver debugging very difficult. I have interfaced directly to an 16f877 using the hardware SP interface.
:=So if anybody has a driver i can share or some pointers please help.
:=
:=thanks in advance
:=regards
:=Rob Sterling

Here is code I wrote using CCS 2.XXX and MPLAB 5.01(I think).
It gives you basic functionality.

//this is to develope code for spi to atmel 45db321 memory. 10-20-2001
//10.26.2001 this works for getting the status out of the
// memory so it should be easy to get spi working for
//the other commands.

#include <16f877.h>
#include <stdlib.h>


#DEVICE PIC16F877 *=16 ICD=TRUE

#use delay (clock=2457600)
#use fast_io(a)
#use fast_io(b)
#use fast_io(c)
#use fast_io(d)
#use fast_io(e)

#define flash_ready_busy_pin pin_c2
#define flash_cs_pin pin_d2

//flash commands for Atmel at45db321
#define main_read 0x52
#define read_buff1 0x54
#define read_buff2 0x56
#define main_to_buff1 0x53
#define main_to_buff2 0x55
#define main_to_buff1_compare 0x60
#define main_to_buff2_compare 0x61
#define write_buff1 0x84
#define write_buff2 0x87
#define buff1_to_main 0x83
#define buff2_to_main 0x86
#define main_write_thru_buff1 0x82
#define main_write_thru_buff2 0x85
#define page_erase 0x81
#define block_erase 0x50
#define status_reg 0x57


#define SSPCON 0x0014

#byte TRISC = 0x0087
#byte TRISD = 0x0088

#byte sspstat = 0x0094
#define bf 0

void cs_low();
int spi_write1(spi_data);

////////////////////////////////////

int spi_write1(spi_data)
{
spi_write(spi_data);
}

////////////////////////////////////

void cs_low() //select the flash
{
output_low(flash_cs_pin);
}

////////////////////////////////////

void cs_high() //deselect and close flash
{

//might need to check sspstat,bf

output_high(flash_cs_pin);
}

////////////////////////////////////

main()
{
int flash_temp;
set_tris_c(0b11010111); //spi,timer1,tx,rx

set_tris_d(0b11111011); //memory control

setup_spi(spi_master|spi_h_to_l|spi_clk_div_4);
output_high(flash_cs_pin);
output_low(flash_cs_pin);
spi_write(0x57);
spi_write(0x55);
flash_temp=spi_read();
while (!bit_test(sspstat,bf));
cs_high();

cs_low();
spi_write1(write_buff1);
spi_write1(0x7f);
spi_write1(0xf8);
spi_write1(0);
spi_write1(11);
while (!bit_test(sspstat,bf));
cs_high();

cs_low();
spi_write1(read_buff1);
spi_write1(0x7f);
spi_write1(0xf8);
spi_write1(0);
spi_write1(10);
spi_write1(10);
spi_write1(10);
flash_temp = spi_read();
spi_write1(10);
flash_temp = spi_read();
spi_write1(10);
flash_temp = spi_read();
while (!bit_test(sspstat,bf));
cs_high();

cs_low();
spi_write(buff1_to_main);
spi_write1(0x7f);
spi_write1(0xf8);
spi_write1(0);
while (!bit_test(sspstat,bf));
cs_high();

cs_low();
spi_write1(main_read);
spi_write1(0x7f);
spi_write1(0xf8);
spi_write1(0);
spi_write1(00);
spi_write1(00);
spi_write1(00);
spi_write1(00);
spi_write1(00);
flash_temp=spi_read();
return(spi_read());

}
___________________________
This message was ported from CCS's old forum
Original Post ID: 11158

[Charlie U]

:=Hi all
:=I am having little or no response from the chip. I am using the 8 pin device and currently cant even read the status so this makes the driver debugging very difficult. I have interfaced directly to an 16f877 using the hardware SP interface.
:=So if anybody has a driver i can share or some pointers please help.
:=
:=thanks in advance
:=regards
:=Rob Sterling

Following the link below and dig deeper. This may have an answer to your problem.
___________________________
This message was ported from CCS's old forum
Original Post ID: 11171

[rob]

Hi

Thanks for the help - i found my problem it was thee spi setup i had
setup_spi(spi_master|spi_l_to_h|spi_clk_div_4); and spi-read();
and the fix is
setup_spi(spi_master|spi_h_to_l|spi_clk_div_4); and sip_read(0);
___________________________
This message was ported from CCS's old forum
Original Post ID: 11253