#define CHANNEL1_PORT 0x41
#define CHANNEL2_PORT 0x42
#define COMMAND_PORT 0x43
+#define SPEAKER_PORT 0x61
#define PIT_INTR_NUM 0
+#define PIT_SPEAKER_GATE 0x01
/* The order of these typedefs is important because the numerical values correspond to the
* values coming from the io ports
struct channel ch_0;
struct channel ch_1;
struct channel ch_2;
+ uint8_t speaker;
};
}
//handle_crystal_tics(dev, &(state->ch_1), oscillations);
- //handle_crystal_tics(dev, &(state->ch_2), oscillations);
+ handle_crystal_tics(dev, &(state->ch_2), oscillations);
}
}
+static int handle_speaker_read(uint8_t *speaker, struct channel * ch, char * val) {
+ *val = *speaker;
+ if ((*speaker & PIT_SPEAKER_GATE)) {
+ *val |= (ch->output_pin << 5);
+ }
+
+ return 0;
+}
-
+static int handle_speaker_write(uint8_t *speaker, struct channel * ch, char val) {
+ *speaker = (val & ~0x20);
+ return 0;
+}
static int handle_channel_cmd(struct channel * ch, struct pit_cmd_word cmd) {
ch->op_mode = cmd.op_mode;
return -1;
}
break;
+ case SPEAKER_PORT:
+ if (handle_speaker_read(&state->speaker, &(state->ch_2), val) == -1) {
+ PrintError("SPEAKER read error\n");
+ return -1;
+ }
+ break;
default:
PrintError("8254 PIT: Read from invalid port (%d)\n", port);
return -1;
return -1;
}
break;
+ case SPEAKER_PORT:
+ if (handle_speaker_write(&state->speaker, &(state->ch_2), val) == -1) {
+ PrintError("SPEAKER write error\n");
+ return -1;
+ }
+ break;
default:
PrintError("8254 PIT: Write to invalid port (%d)\n", port);
return -1;
pit_state = (struct pit *)V3_Malloc(sizeof(struct pit));
V3_ASSERT(pit_state != NULL);
+ pit_state->speaker = 0;
dev = v3_allocate_device(dev_id, &dev_ops, pit_state);
v3_dev_hook_io(dev, CHANNEL1_PORT, &pit_read_channel, &pit_write_channel);
v3_dev_hook_io(dev, CHANNEL2_PORT, &pit_read_channel, &pit_write_channel);
v3_dev_hook_io(dev, COMMAND_PORT, NULL, &pit_write_command);
+ v3_dev_hook_io(dev, SPEAKER_PORT, &pit_read_channel, &pit_write_channel);
#ifdef CONFIG_DEBUG_PIT
PrintDebug("8254 PIT: OSC_HZ=%d, reload_val=", OSC_HZ);