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Here is an example reading the DIO card that you can buy from TS for the PC104 bus. Check the manual to verify the offsets for the PC104 bus itself, and also your card. Make you add the compiler option -mcpu=arm9 Don. #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <sys/mman.h> /******************************************************************** Routine to initialize and test the TS-DIO24. Written by Donald W. Carr ********************************************************************/ // Start for PC/104 8 bit read/write to I/O static volatile unsigned char *pc104_start; static volatile unsigned char *dio24_r0; static volatile unsigned char *dio24_r1; static volatile unsigned char *dio24_r2; static volatile unsigned char *dio24_r3; static volatile unsigned char *dio24_r4; static volatile unsigned char *dio24_r5; static volatile unsigned char *dio24_r6; static volatile unsigned char *dio24_r7; // Pick the correct base depending on jumper settings #define DIO24_BASE (0x0100) //#define DIO24_BASE (0x0108) //#define DIO24_BASE (0x0110) //#define DIO24_BASE (0x0118) /********************************************************************/ int main(int argc, char *argv[]) { int size = getpagesize(); printf("Page Size = %d\n", size); int fd = open("/dev/mem", O_RDWR|O_SYNC); if (fd == -1) { perror("open /dev/mem"); exit(1); } pc104_start = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x11E00000); if (MAP_FAILED == pc104_start) { perror("mmap"); exit(1); } // Assign the addresses for all of the registers dio24_r0 = (unsigned char *) (pc104_start + DIO24_BASE + 0); dio24_r1 = (unsigned char *) (pc104_start + DIO24_BASE + 1); dio24_r2 = (unsigned char *) (pc104_start + DIO24_BASE + 2); dio24_r3 = (unsigned char *) (pc104_start + DIO24_BASE + 3); dio24_r4 = (unsigned char *) (pc104_start + DIO24_BASE + 4); dio24_r5 = (unsigned char *) (pc104_start + DIO24_BASE + 5); dio24_r6 = (unsigned char *) (pc104_start + DIO24_BASE + 6); dio24_r7 = (unsigned char *) (pc104_start + DIO24_BASE + 7); *dio24_r3 = 0x00; // disaple all interupts *dio24_r4 = 0x03; // select borts B and C for input printf("Wrote, r3 = 0x00 (no interrupts) , r1 = 0x03 (B,C input)\n"); if (*dio24_r0 == 0x54) { printf("Card detected!!\n"); } else { printf("Card not detected, check base address, or card not installed\n"); } *dio24_r5 = 0xA5; // Set some bits for port A. while (1) // Now read all of the ports once a second { sleep(1); unsigned char byte3 = *dio24_r3; printf("0-7: %02x %02x %02x %02x %02x %02x %02x %02x\n", (int) *dio24_r0, (int) *dio24_r1, (int) *dio24_r2, (int) *dio24_r3, (int) *dio24_r4, (int) *dio24_r5, (int) *dio24_r6, (int) *dio24_r7); } } /********************************************************************/ On 1/21/07,
Mr Stagiaire <> wrote:
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