UART TX: Difference between revisions

Revision as of 11:13, 4 May 2020

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

Write:

send a byte to the connected device. There is no Tx buffer so the program must make sure the last transmission is completed before sending another byte.

Read:

bit 2 = 1 if the read buffer is full

bit 1 = 1 if the transmitter is busy sending a byte

bit 0 = 1 if the read buffer contains received bytes

@@ Line 8: / Line 8: @@
 |Subsystem=UART
 }}
-Write to this port sends the byte to serial port (routed to WiFi module connector).
+Write:
-Read from this port returns 0 if there are bytes to read in RX FIFO buffer, or 1 if no RX data.
+: send a byte to the connected device.  There is no Tx buffer so the program must make sure the last transmission is completed before sending another byte.
+Read:
+: bit 2 = 1 if the read buffer is full
+: bit 1 = 1 if the transmitter is busy sending a byte
+: bit 0 = 1 if the read buffer contains received bytes