From f628b56812727bc87da4e3da98322fd4cd12b213 Mon Sep 17 00:00:00 2001
From: Ben Blazak <benblazak@gmail.com>
Date: Tue, 13 Mar 2012 23:51:51 -0700
Subject: [PATCH] worked on pin assignments a little; and some other minor
 updates

---
 doc/references.md      |  3 +++
 src/ergodox-firmware.c | 22 ++++++++++++++++------
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/doc/references.md b/doc/references.md
index 3f7bb32..1b5e078 100644
--- a/doc/references.md
+++ b/doc/references.md
@@ -23,6 +23,9 @@
 	  -> [powering LEDs]
 	     (http://wolfstone.halloweenhost.com/Lighting/litlpo_PoweringLEDs.html)
 
+* [Vcc, Vdd, Vss, etc.]
+  (http://encyclobeamia.solarbotics.net/articles/vxx.html)
+
 
 ## Noob C Stuff
 
diff --git a/src/ergodox-firmware.c b/src/ergodox-firmware.c
index 604e55d..9ca0081 100644
--- a/src/ergodox-firmware.c
+++ b/src/ergodox-firmware.c
@@ -28,12 +28,12 @@
 
 /* ----------------------------------------------------------------------------
  * Pinouts and Pin assignments
- * ===========================
  * - '+' indicates pin
  * - 'o' indicates unused pin
  * - '-'s inserted between some of the pin names for readability
  * - 'OC**' pins enclosed in parenthesis had lines over them in the pinout
  * ----------------------------------------------------------------------------
+ * ----------------------------------------------------------------------------
  *  Teensy 2.0
  *  ==========               GND +---.....---+ VCC
  *                        SS PB0 +           + PF0 ADC0
@@ -94,11 +94,22 @@
  *             column4      GPB4 +07       22+ GPA2   row2
  *             column5      GPB5 +08       21+ GPA1   row1
  *             column6      GPB6 +09       20+ GPA0   row0
- *                               o10       19+ INTA   ?TODO
- *      power_positive  Vdd(Vcc) +11       18+ INTB   ?TODO
+ *                               o10       19o
+ *      power_positive  Vdd(Vcc) +11       18o
  *                 I2C       SCL +12       17o
- *                 I2C       SDA +13       16+ RESET  ?TODO
- *                               o14-------15+ ADDR   ?TODO
+ *                 I2C       SDA +13       16+ RESET  (see note)
+ *                               o14-------15+ ADDR   (see note)
+ *
+ *  notes:
+ *  - ADDR (pin15): Set to 0b000 via
+ *        Vdd(Vcc) -- R1 -- V2 (on ADDR) -- R2 -- Vss(GND)
+ *    where
+ *        Vdd = +5V
+ *         R1 = ?TODO:\
+ *         V2 = ?TODO: | (see mcp23018 datasheet, pg 11)
+ *         R2 = ?TODO:/
+ *  - RESET (pin16): Not used by software.  Might want to have it available
+ *    somewhere physically just in case though?
  * ------------------------------------------------------------------------- */
 
 
@@ -176,4 +187,3 @@ void main() {
 	init();
 }
 
-