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linetest.c
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linetest.c
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#include <stdio.h>
#include <sched.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h> /* For mode constants */
#include <fcntl.h> /* For O_* constants */
#include <stdlib.h>
#define COLUMN_MAX 145
#define ROWS 7
#define LINES 3
#define BYTES_PER_LINE 19
unsigned char *shared_memory_setup(int size)
{
unsigned char *result = NULL;
/* Open the shared memory. */
int descriptor = shm_open("ledsign", O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
/* Size up the shared memory. */
ftruncate(descriptor, size);
result = mmap(NULL, size,
PROT_WRITE | PROT_READ, MAP_SHARED,
descriptor, 0 );
return result;
}
int main(int argc, char **argv) {
// turn on lines one at a time
unsigned char *outbuff = shared_memory_setup(ROWS * LINES * BYTES_PER_LINE);
int a;
while (1)
{
int line, row, on_row, byte = 0;
for(on_row = 0; on_row < 7; on_row++)
{
printf("Testing Row %i\n", on_row);
for(row = 0; row < 7; row++)
{
int offset = BYTES_PER_LINE * row;
for(byte =0; byte<BYTES_PER_LINE; byte++)
{
*(outbuff+offset+byte) = (row==on_row)?0xff:0x00;
}
}
for(line = 0; line < 3; line++)
{
for(row = 0; row < 7; row++)
{
int offset = BYTES_PER_LINE * (row + (7*line));
for(byte =0; byte<BYTES_PER_LINE; byte++)
{
*(outbuff+offset+byte) = (row==on_row)?0xff:0x00;
}
}
}
sleep(2);
}
}
// for(a = 0; a< ROWS * LINES * BYTES_PER_LINE; a++) {
// *(outbuff+a) = (char)a;
// }
return 0;
}