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add loopback to UART

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toast 2025-09-27 14:48:42 -07:00 • committed by Fabian
parent 54ec8e8daa
commit e65e4f441e
1 changed files with 8 additions and 1 deletions
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9
src/uart.js
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@ -26,6 +26,9 @@ const UART_IIR_RDI = 0x04; /* Receiver data interrupt */
const UART_IIR_RLSI = 0x06; /* Receiver line status interrupt (High p.) */
const UART_IIR_CTI = 0x0c; /* Character timeout */
// Modem control register
const UART_MCR_LOOPBACK = 0x10;
const UART_LSR_DATA_READY = 0x1; // data available
const UART_LSR_TX_EMPTY = 0x20; // TX (THR) buffer is empty
const UART_LSR_TRANSMITTER_EMPTY = 0x40; // TX empty and line is idle
@ -399,7 +402,11 @@ UART.prototype.write_data = function(out_byte)
this.ThrowInterrupt(UART_IIR_THRI);
this.bus.send("serial" + this.com + "-output-byte", out_byte);
if(this.modem_control & UART_MCR_LOOPBACK) {
this.data_received(out_byte);
} else {
this.bus.send("serial" + this.com + "-output-byte", out_byte);
}
if(DEBUG)
{