TS-8100-4200 kpad
From embeddedTS Manuals
This header is designed to connect to the KPAD accessory which uses the odd DIO on this header to scan a 4x4 keypad. This example scans the KPAD and prints out the pressed character.
/* KPAD 4x4 keypad example code
*
* To compile, copy to the board and run:
* gcc kpad.c -o kpad */
#include <stdio.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
// The mpeek/mpoke functions are specific to the TS-4200
volatile uint16_t *muxbus = 0;
uint16_t mpeek16(uint16_t addr)
{
uint16_t value;
if(muxbus == 0) {
int mem = open("/dev/mem", O_RDWR|O_SYNC);
muxbus = mmap(0,
getpagesize(),
PROT_READ|PROT_WRITE,
MAP_SHARED,
mem,
0x30000000);
}
return muxbus[(addr + 0x400)/2];
}
void mpoke16(uint16_t addr, uint16_t value)
{
if(muxbus == 0) {
int mem = open("/dev/mem", O_RDWR|O_SYNC);
muxbus = mmap(0,
getpagesize(),
PROT_READ|PROT_WRITE,
MAP_SHARED,
mem,
0x30000000);
}
muxbus[(addr + 0x400)/2] = value;
}
int main()
{
uint8_t ddr = 0xf0;
uint8_t out = 0x0f;
int row, col;
char *keys[4][4] = {
{ "1", "2", "3", "UP" },
{ "4", "5", "6", "DOWN" },
{ "7", "8", "9", "2ND" },
{ "CLEAR", "0", "HELP", "ENTER" }
};
//set first 4 as outputs, last 4 as inputs
mpoke16(0x8, ddr);
mpoke16(0x4, out);
while(1) {
for(row = 0; row < 4; row++) {
mpoke16(0x8, ddr | (1 << row));
mpoke16(0x4, out | (1 << row));
usleep(50000);
uint16_t in = mpeek16(0xc);
for(col = 4; col < 8; col++) {
if(in & (1 << col)) {
// If we read it, sleep and read again to debounce
usleep(1000);
in = mpeek16(0xc);
if(in & (1 << col)) {
printf("%s\n", keys[row][col - 4]);
fflush(stdout);
}
}
}
}
}
return 0;
}