2013-11-06 01:12:55 +01:00
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/**
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* No full implementation, just dumping serial output
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* to console
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*
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2014-01-08 03:14:33 +01:00
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*/
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/** @const */
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var DLAB = 0x80;
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/**
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2013-11-06 01:12:55 +01:00
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* @constructor
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*/
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2014-01-08 03:14:33 +01:00
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function UART(dev, port, adapter)
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2013-11-06 01:12:55 +01:00
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{
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2014-01-05 03:19:09 +01:00
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var io = dev.io,
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2014-01-08 03:14:33 +01:00
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pic = dev.pic,
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line = "",
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baud_rate = 0,
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line_control = 0,
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line_status = 0,
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fifo_control = 0,
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interrupt_enable = 0,
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modem_control = 0,
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modem_status = 0,
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scratch_register = 0,
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irq = 0,
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input = new ByteQueue(4096);
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if(port === 0x3E8 || port === 0x3F8)
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{
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irq = 4;
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}
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else if(port === 0x3E8 || port === 0x3E8)
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{
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irq = 3;
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}
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else
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{
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dbg_log("Invalid port: " + h(port), LOG_SERIAL);
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return;
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}
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function data_received(data)
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{
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input.push(data);
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if(interrupt_enable & 1)
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{
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push_irq();
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}
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}
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adapter.init(data_received);
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function push_irq()
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{
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pic.push_irq(irq);
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}
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io.register_write(port, function(out_byte)
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{
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if(line_control & DLAB)
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{
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baud_rate = baud_rate & ~0xFF | out_byte;
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return;
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}
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//dbg_log("data: " + h(out_byte), LOG_SERIAL);
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if(out_byte === 0xFF)
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{
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return;
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}
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if(!adapter)
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{
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return;
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}
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if(adapter.put_line)
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{
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if(out_byte === 0x0A)
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{
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adapter.put_line(line);
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line = "";
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}
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else
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{
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line += String.fromCharCode(out_byte);
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}
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}
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else
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{
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adapter.put_str(String.fromCharCode(out_byte));
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}
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});
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io.register_write(port | 1, function(out_byte)
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{
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if(line_control & DLAB)
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{
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baud_rate = baud_rate & 0xFF | out_byte << 8;
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dbg_log("baud rate: " + h(baud_rate), LOG_SERIAL);
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}
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else
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{
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interrupt_enable = out_byte;
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dbg_log("interrupt enable: " + h(out_byte), LOG_SERIAL);
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}
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});
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2013-11-06 01:12:55 +01:00
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2014-01-08 03:14:33 +01:00
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io.register_read(port, function()
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2013-11-06 01:12:55 +01:00
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{
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2014-01-08 03:14:33 +01:00
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if(line_control & DLAB)
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{
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return baud_rate & 0xFF;
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}
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else
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2013-11-06 01:12:55 +01:00
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{
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2014-01-08 03:14:33 +01:00
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var data = input.shift();
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2014-01-05 03:19:09 +01:00
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2014-01-08 03:14:33 +01:00
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if(data === -1)
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{
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dbg_log("Input empty", LOG_SERIAL);
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}
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else
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{
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dbg_log("Input: " + h(data), LOG_SERIAL);
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}
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return data;
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}
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});
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io.register_read(port | 1, function()
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{
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if(line_control & DLAB)
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{
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return baud_rate >> 8;
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2013-11-06 01:12:55 +01:00
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}
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else
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{
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2014-01-08 03:14:33 +01:00
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return interrupt_enable;
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2013-11-06 01:12:55 +01:00
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}
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});
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2013-12-20 22:05:49 +01:00
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2014-01-08 03:14:33 +01:00
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io.register_read(port | 2, function()
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{
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return fifo_control;
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});
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io.register_write(port | 2, function(out_byte)
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{
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dbg_log("fifo control: " + h(out_byte), LOG_SERIAL);
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fifo_control = out_byte;
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});
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io.register_read(port | 3, function()
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{
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return line_control;
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});
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io.register_write(port | 3, function(out_byte)
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{
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dbg_log("line control: " + h(out_byte), LOG_SERIAL);
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line_control = out_byte;
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});
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io.register_read(port | 4, function()
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{
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return modem_control;
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});
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io.register_write(port | 4, function(out_byte)
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{
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dbg_log("modem control: " + h(out_byte), LOG_SERIAL);
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modem_control = out_byte;
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});
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io.register_read(port | 5, function()
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{
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var line_status = 0;
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if(input.length)
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{
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line_status |= 1;
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}
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line_status |= 0x20;
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//dbg_log("read line status: " + h(line_status), LOG_SERIAL);
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return line_status;
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});
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io.register_write(port | 5, function(out_byte)
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{
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});
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io.register_read(port | 6, function()
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{
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//dbg_log("read modem status: " + h(modem_status), LOG_SERIAL);
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return modem_status;
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});
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io.register_write(port | 6, function(out_byte)
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{
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modem_status = out_byte;
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});
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io.register_read(port | 7, function()
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{
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return scratch_register;
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});
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io.register_write(port | 7, function(out_byte)
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2013-12-20 22:05:49 +01:00
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{
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2014-01-08 03:14:33 +01:00
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scratch_register = out_byte;
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2013-12-20 22:05:49 +01:00
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});
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2013-11-06 01:12:55 +01:00
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}
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