Difference between revisions of "UART TX"

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{{Port
 
{{Port
 
|Number=$133B
 
|Number=$133B
 +
|NumberDec=4923
 +
|PortMask=%0001 0011 0011 1011
 
|ShortDesc=Sends byte to serial port. If read, tells if data in RX buffer
 
|ShortDesc=Sends byte to serial port. If read, tells if data in RX buffer
 
|Readable=Yes
 
|Readable=Yes
 
|Writable=Yes
 
|Writable=Yes
 
|Subsystem=UART
 
|Subsystem=UART
|PortMask=%0001 0011 0011 1011 ??
 
 
}}
 
}}
Write to this port sends the byte to serial port (routed to WiFi module connector).
+
0x133B UART Tx
Read from this port returns 0 if there are bytes to read in RX FIFO buffer, or 1 if no RX data.
+
 
 +
(R)
 +
:bit 7 = 1 if the Rx is in a break condition      ; external device has held Tx=0 for at least 20 bit periods
 +
:bit 6 = 1 if the Rx experienced a framing error  ; (clears on read, includes parity and stop bit errors)
 +
:bit 5 = 1 if the next Rx byte was received after an error condition was detected (framing, overflow)
 +
:bit 4 = 1 if the Tx buffer is empty
 +
:bit 3 = 1 if the Rx buffer is near full (3/4)
 +
:bit 2 = 1 if the Rx buffer overflowed            ; (clears on read)
 +
:bit 1 = 1 if the Tx buffer is full
 +
:bit 0 = 1 if the Rx buffer contains bytes
 +
 
 +
(W)
 +
:Send a byte to the connected device.

Latest revision as of 22:05, 1 July 2022

Number $133B
Decimal 4923
Short desc. Sends byte to serial port. If read, tells if data in RX buffer
Bit Mask %0001 0011 0011 1011
Readable Yes
Writable Yes
Subsystem UART

0x133B UART Tx

(R)

bit 7 = 1 if the Rx is in a break condition  ; external device has held Tx=0 for at least 20 bit periods
bit 6 = 1 if the Rx experienced a framing error  ; (clears on read, includes parity and stop bit errors)
bit 5 = 1 if the next Rx byte was received after an error condition was detected (framing, overflow)
bit 4 = 1 if the Tx buffer is empty
bit 3 = 1 if the Rx buffer is near full (3/4)
bit 2 = 1 if the Rx buffer overflowed  ; (clears on read)
bit 1 = 1 if the Tx buffer is full
bit 0 = 1 if the Rx buffer contains bytes

(W)

Send a byte to the connected device.