ok it's checked in.
BTW my interpretation of the Atmel datasheet is that only writes are limited to 8 bytes;
reads don't appear to have a limit (although the i2c layer has a 32 byte limit).
Our i2c-dev.h in our package got reduced to almost nothing by Kyosti,
I'm going to try and recover it in our 2.4 branch so we're back where
this compiles.
Christian Vogel wrote:
> Hi Mark,
>
> On Thu, May 22, 2003 at 09:22:17AM -0400, Mark Studebaker wrote:
>
>>In lm_sensors-2.7.0,
>>we've already made clear in the README files in prog/eepromer
>>that 'eeprom' is for small eeproms and 'eepromer' is for big eeproms.
>
>
> Nobody doubts that :-) The problem with "eeprom.c" is, that it's not
> working with *very* *small* eeproms. The small ones must be written/read
> 8 bytes at a time (which also works with the bigger ones) whereas my code uses 16.
>
> Furthermore, Frank found another error (the condition in the
> for(;;)-loop) which should be corrected nevertheless. Therefore please
> consider applying the patch below which is exactly what Frank sent to
> you as a whole file.
>
> Greetings,
> Chris
>
> --- eeprom.c 2003/05/22 13:01:44 1.1
> +++ eeprom.c 2003/05/22 14:04:20
> @@ -22,7 +22,9 @@
> #define DEFAULT_EEPROM_ADDR 0x50 /* the 24C16 sits on i2c address 0x50 */
> #define DEFAULT_NUM_PAGES 8 /* we default to a 24C16 eeprom which has 8 pages */
> #define BYTES_PER_PAGE 256 /* one eeprom page is 256 byte */
> -#define MAX_BYTES 16 /* max number of bytes to write in one piece */
> +#define MAX_BYTES 8 /* max number of bytes to write in one chunk */
> + /* ... note: 24C02 and 24C01 only allow 8 bytes to be written in one chunk. *
> + * if you are going to write 24C04,8,16 you can change this to 16 */
>
> /* write len bytes (stored in buf) to eeprom at address addr, page-offset offset */
> /* if len=0 (buf may be NULL in this case) you can reposition the eeprom's read-pointer */
> @@ -264,11 +266,11 @@
> for(j=0;j<sizeof(buf);j++)
> buf[j]=0;
> }
> - for(j=0;j<MAX_BYTES;j++)
> + for(j=0;j<(BYTES_PER_PAGE/MAX_BYTES);j++)
> if(eeprom_write(d,addr+i,j*MAX_BYTES,buf+(j*MAX_BYTES),MAX_BYTES)<0)
> exit(1);
> } else {
> - for(j=0;j<MAX_BYTES;j++)
> + for(j=0;j<(BYTES_PER_PAGE/MAX_BYTES);j++)
> if(eeprom_read(d,addr+i,j*MAX_BYTES,buf+(j*MAX_BYTES),MAX_BYTES)<0)
> exit(1);
> }
>
