[ts-7000] [ts7400] program crash when writing GPIO data register

["yuezhu92" <>]

Hello all,

I've written an small application to drive GPIO in userspace (on Debian linux 
SDcard)

The program crashs when it tries to write the GPIO data register for DIO_8 to 
DIO_15 (0x12c0_0003, according to APPENDIX B in TS7400 manual). Read/Write all 
other registers related to GPIO works fine. 

Has any one ever had this problem?
I compile on native system linking linux source on destop-pc via nfs.
Version is 2.4.26-ts11

code:


int fd = open("/dev/mem", O_RDWR|O_SYNC);

char* page1   = (char *)mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 
0x12c00000);

page1[3] = 0xff; //error! program crash

Thanks

Yue





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