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Somewhat better serial device. Still one way only.

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This commit is contained in:
Radosław Kujawa 2017-02-25 02:04:12 +01:00
parent 97c7709dc7
commit 1f072e1b11
1 changed files with 41 additions and 11 deletions
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52
src/device_serial.c
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@ -1,7 +1,6 @@
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
//#include <string.h>
#include <unistd.h>
#include <fcntl.h>
@ -11,10 +10,12 @@
#include "bus.h"
#include "device.h"
const static char *pipepath = "/tmp/serial_tx"; /* should really be configurable */
const static char *txpipepath = "/tmp/rk65c02_serial_tx"; /* should really be configurable */
const static char *rxpipepath = "/tmp/rk65c02_serial_rx"; /* should really be configurable */
struct device_serial_priv {
int pipefd;
int txpipefd;
int rxpipefd;
};
uint8_t device_serial_read_1(void *, uint16_t);
@ -25,13 +26,24 @@ device_serial_read_1(void *vd, uint16_t offset)
{
device_t *d;
struct device_serial_priv *dp;
uint8_t val, nread;
d = (device_t *) vd;
dp = d->aux;
switch (offset) {
case 0x1:
nread = read(dp->rxpipefd, &val, 1);;
if (nread == 0)
val = 0xFE;
if (nread == -1)
val = 0xFD;
default:
break;
}
// XXX: TODO
return 0xAA;
return 0xFF;
}
void
@ -43,10 +55,16 @@ device_serial_write_1(void *vd, uint16_t offset, uint8_t val)
d = (device_t *) vd;
dp = d->aux;
/*fprintf(stderr, "writing to fd %d val %x", dp->pipefd, val);*/
write(dp->pipefd, &val, 1);
fsync(dp->pipefd);
switch (offset) {
case 0x0:
/*fprintf(stderr, "writing to fd %d val %x\n", dp->txpipefd, val);*/
write(dp->txpipefd, &val, 1);
fsync(dp->txpipefd);
break;
default:
/* do nothing */
break;
}
}
device_t *
@ -68,12 +86,17 @@ device_serial_init()
dp = (struct device_serial_priv *) malloc(sizeof(struct device_serial_priv));
d->aux = dp;
if (mkfifo(pipepath, S_IRUSR | S_IWUSR) != 0) {
if (mkfifo(txpipepath, S_IRUSR | S_IWUSR) != 0) {
fprintf(stderr, "Creating FIFO for serial port failed!\n");
/* perror, handle this failure... */
}
if (mkfifo(rxpipepath, S_IRUSR | S_IWUSR) != 0) {
fprintf(stderr, "Creating FIFO for serial port failed!\n");
/* perror, handle this failure... */
}
dp->pipefd = open(pipepath, O_RDWR);
dp->txpipefd = open(txpipepath, O_WRONLY);
dp->rxpipefd = open(rxpipepath, O_RDONLY | O_NONBLOCK);
return d;
}
@ -81,7 +104,14 @@ device_serial_init()
void
device_serial_finish(device_t *d)
{
close(dp->txpipefd);
close(dp->rxpipefd);
unlink(txpipepath);
unlink(rxpipepath);
free(d->aux);
//close pipe etc.
// XXX?
}