From b49dfa32cc38e7a8a708261a03ed0d8ce69f7feb Mon Sep 17 00:00:00 2001 From: Marti Bolivar Date: Tue, 16 Aug 2011 06:11:25 -0400 Subject: usart: Add electrical configuration removed from serial.rst. --- source/usart.rst | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'source') 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 `_ (PDF), Chapter 27. +* `Serial and UART Tutorial + `_ (written for + FreeBSD, but contains a large amount of general information). -- cgit v1.2.3