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| author | Marti Bolivar <mbolivar@leaflabs.com> | 2011-08-16 06:11:25 -0400 |
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| committer | Marti Bolivar <mbolivar@leaflabs.com> | 2011-08-16 06:11:25 -0400 |
| commit | b49dfa32cc38e7a8a708261a03ed0d8ce69f7feb (patch) | |
| tree | 09dc5e5bcf6bba4a84e6a56d9f31d411ee354a66 /source | |
| parent | 1529927c59ee12f390bec9eb612343a982e1f43c (diff) | |
| download | librambutan-b49dfa32cc38e7a8a708261a03ed0d8ce69f7feb.tar.gz librambutan-b49dfa32cc38e7a8a708261a03ed0d8ce69f7feb.zip | |
usart: Add electrical configuration removed from serial.rst.
Diffstat (limited to 'source')
| -rw-r--r-- | source/usart.rst | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/source/usart.rst b/source/usart.rst index e65821d..fa9c55c 100644 --- a/source/usart.rst +++ b/source/usart.rst @@ -10,11 +10,17 @@ another Maple, etc.). .. contents:: Contents :local: +.. _usart-circuit: + Hardware/Circuit Design ----------------------- -.. TODO [0.0.12] Add some more information here (like how you should -.. connect TX_a to RX_b and RX_a to TX_b). +To use a serial port to communicate with an external serial device, +connect the TX pin to your device's RX pin, the RX to your device's TX +pin, and your Maple board's ground to your device's ground. + +.. warning:: Don't connect these pins directly to an RS232 serial + port; they operate at +/- 12V and can damage your board. .. TODO [0.0.12/Maple Native] UART4 and UART5, Native links @@ -52,3 +58,6 @@ Recommended Reading * ST `Reference Manual RM0008 <http://www.st.com/stonline/products/literature/rm/13902.pdf>`_ (PDF), Chapter 27. +* `Serial and UART Tutorial + <http://www.freebsd.org/doc/en/articles/serial-uart/>`_ (written for + FreeBSD, but contains a large amount of general information). |