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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| is I2C FORCE_HW compatible with status check of write ? |
 Posted: Fri May 15, 2009 1:27 pm |
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V3.249 18F4525 @ 18432000Hz
I'm using a Microchip 24LC256 chip and I'm rewriting the driver for
page write and for going across chip boundaries.
my question: is I2C FORCE_HW compatible with status check of write?
I am using the write_ext_eeprom() from 24256.c as a start.
When I change to FORCE_HW my routine locks and can't complete the write. It seems to be stuck at the status check.
If I turn off FORCE_HW then it works.
C:\Program Files\PICC\Drivers\24256.C
| Code: | void write_ext_eeprom(long int address, BYTE data)
{
//parts are missing for the copyrights sake
.....stop...
i2c_start();
status=i2c_write(0xa0);
while(status==1)
{
i2c_start();
status=i2c_write(0xa0);
}
}
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this is changed in the driver
#use i2c(master,SDA=EEPROM_SDA,SCL=EEPROM_SCL,FORCE_HW) //start with slow
| Code: | //05/14/2009 9:54AM Single 24LC256 EEPROM
#define FIRM_MAJOR (int8) 'i'
#define FIRM_MINOR (int8) 8
#include <18F4525.h>
#fuses hs,nowdt,noprotect,nolvp,put
#use delay(clock=18432000,RESTART_WDT)
#use rs232(baud=19200,xmit=PIN_D7,invert,stream=DEBUG)
#case
#zero_ram
#include <STDLIB.H>
#define AddrVal 0
#define EEPROM_SDA PIN_C4
#define EEPROM_SCL PIN_C3
#include "24256.C" //local copy of driver.. I'm messing with this
void init(void);
void init_ext_eeprom(void);
void display_binary(char c);
void write_ext_eeprom(int16 address,int8 data);
int8 read_ext_eeprom(int16 address);
void main(void)
{
int8 i,tmp;
int8 w[70];//1024 byte write array with random data
int8 r[70];//1024 byte read array with read in data
int16 addr;//array is written to and read from address
int16 cnt;//counter for setting up array
init();
init_ext_eeprom();
addr=AddrVal;
for (cnt=0;cnt<sizeof(w);cnt++) w[cnt]=rand();
for(addr=AddrVal,cnt=0;cnt<sizeof(w);cnt++,addr++)
{
write_ext_eeprom(addr,w[cnt]);
fprintf(DEBUG,".");
}
for(addr=AddrVal,cnt=0;cnt<sizeof(w);cnt++,addr++)
{
r[cnt]=read_ext_eeprom(addr);
}
for (cnt=0;cnt<sizeof(w);cnt++)
{
if(r[cnt]!=w[cnt])
{
fprintf(DEBUG,"\w\rError r=%03u w=%03u cnt=%lu\n\r",r[cnt],w[cnt],cnt);
}
}
fprintf(DEBUG,"\n\rDone!\n\r");
while(1);
}
//========================= Functions ==============================//
//=== init ===// setup the initial settings
#define BEEP PIN_C0
#define RELAY PIN_C1
#define XMTHEN PIN_C5
void init(void)
{
int8 tmp;
output_low(BEEP);
output_low(RELAY);
output_low(XMTHEN);
//set_tris_a(0xFF);set_tris_b(0xFF);set_tris_c(0xFF);set_tris_d(0xFF);set_tris_e(0xFF);
setup_adc_ports(NO_ANALOGS); setup_adc(ADC_OFF);
port_b_pullups(FALSE);
fprintf(DEBUG,"Start\n\r");
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri May 15, 2009 2:12 pm |
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| Quote: |
i2c_start();
status=i2c_write(0xa0);
while(status==1)
{
i2c_start();
status=i2c_write(0xa0);
}
i2c_stop();
} |
I noticed one difference between your code and 24256.c.
CCS has an i2c_stop at the end. Your code does not. |
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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| Posted: Fri May 15, 2009 2:15 pm |
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The stop you mentioned fixed it.
This is what I have.. Ill delete if someone could only verify it. Thanks
Ver 3.249
edit ...
snip..
or should there be a stop after the while(status==1) block of the write
Last edited by treitmey on Fri May 15, 2009 4:51 pm; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| Posted: Fri May 15, 2009 5:03 pm |
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I did see that errata. Tried to pop in a 18F452 at about noon time to eliminate that from the equation.
...but by now my brain is mush and I don't know what was tried/eliminated or not.
I've got it working now.
Thanks |
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