[U-Boot-Users] printf question
Okay - so this is probably not a big deal, however when I use the printf in u-boot as follows:
unsigned char x = 0xC2;
printf("this is the problem %02X\n", x);
result is:
this is the problem FFFFFFFC2
-----Original Message----- From: Zhang, Jian [mailto:jzhang@ti.com] Sent: Tuesday, February 03, 2004 2:23 PM To: 'u-boot-users@lists.sourceforge.net' Cc: Zhang, Jian; Woodruff, Richard; Powers, John Subject: [U-Boot-Users] [PATCH] bug fixes for fat.h
This patch fixed two bugs found in fat.h. It is a diff with U-Boot-1.0.0 (10/29/2003).
1. The number of FAT12 entries in FAT12 buffer was calculated incorrectly. As a result, you are not able to read any big file using more 2048 FAT12 entries.
2. data_begin in fsdata struct can be negative depending on the FAT system layout. If it happens, wrong sectors are requested by fat code.
Best Regards, Jian Zhang
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Jerry Walden wrote:
Okay - so this is probably not a big deal, however when I use the printf in u-boot as follows:
unsigned char x = 0xC2;
printf("this is the problem %02X\n", x);
result is:
this is the problem FFFFFFFC2
On most systems any datum of size less than int is implicitly converted to int when passed to a varargs function such as printf.
Char is typically signed so the conversion of any char with the 7 bit set will result in a negative integer.
0xC2 -> 0xFFFFFFFFC2.
To solve it just and with 0xFF.
Regards
Pantelis
In message 603BA0CFF3788E46A0DB0918D9AA95100A09CA4B@sj580004wcom.int.lantronix.com you wrote:
Okay - so this is probably not a big deal, however when I use the printf in u-boot as follows:
unsigned char x = 0xC2; printf("this is the problem %02X\n", x);
result is:
this is the problem FFFFFFFC2
Which system is this on?
-----Original Message----- From: Zhang, Jian [mailto:jzhang@ti.com] Sent: Tuesday, February 03, 2004 2:23 PM To: 'u-boot-users@lists.sourceforge.net' Cc: Zhang, Jian; Woodruff, Richard; Powers, John Subject: [U-Boot-Users] [PATCH] bug fixes for fat.h
...
Why are you quoting a totally unrelated message here????
Wolfgang Denk
participants (3)
-
Jerry Walden -
Pantelis Antoniou -
Wolfgang Denk