X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;ds=sidebyside;f=cluck.lisp;h=1267bd15e737c0c4ad21ce28647ff7a6412fe61a;hb=1cc74b26dec2bbe49fa511ad366e33e271a3f0a7;hp=ba30b44b8d480a84ec682358f35b84a795560ea8;hpb=6ff14a32a58770c6d3b32c9679936f128cd5d6fc;p=cluck.git

diff --git a/cluck.lisp b/cluck.lisp
index ba30b44..1267bd1 100644
--- a/cluck.lisp
+++ b/cluck.lisp
@@ -5,7 +5,7 @@
 ;;;; Name:          cluck.asd
 ;;;; Purpose:       Common Lisp uControler Clock Calculator
 ;;;; Programmer:    Kevin M. Rosenberg
-;;;; Date Started:  March 207
+;;;; Date Started:  March 2007
 ;;;;
 ;;;; $Id$
 ;;;;
@@ -36,9 +36,9 @@
 ;;;; SUCH DAMAGE.
 ;;;; *************************************************************************
 
-(defpackage cluck
+(defpackage #:cluck
   (:use #:cl)
-  (:export 
+  (:export
    #:show-timers
    #:show-8-bit-timers
    #:show-16-bit-timers
@@ -53,12 +53,11 @@
 (defvar *f-cpu* 16000000)
 
 (defvar *8-bit-prescalars* '(1 8 64 256))
-
 (defvar *10-bit-prescalars* '(1 8 64 256 1024))
 
 (defvar *base-error-zero-baud-clk* (* 9 25 8192)
 "Base multiple for multi-megahertz clock frequencies to have
-0% error at common UART baud rates. Value of this base is 1.8432 million. 
+0% error at common UART baud rates. Value of this base is 1.8432 million.
 Common multiples of this are 2 (3.6864Mhz), 4 (7.3728Mhz), 8 (14745600),
 and 10 (18.432MHz)")
 
@@ -119,16 +118,17 @@ controllers, 32-bit timers use 8-bit prescalers"
     (ms-timer-width ms f-cpu *10-bit-prescalars* width)))
 
 (defparameter *baud-rates* '(300 600 1200 2400 4800 9600 14400 19200 28800
-                             38400 56000 57600 76800 115200 128000 250000 256000 500000))
+                             38400 56000 57600 76800 115200 128000 250000
+                             256000 500000))
 
 (defun avr-uart-divisors (&optional (f-cpu *f-cpu*) (view-below-percent nil))
   "Displays the divisor UBRR and error percent for various baud
 rates for F_CPU. UBBR is limited to 12 bits."
   (dolist (baud *baud-rates*)
     (let* ((ubrr (min 4096
-                      (round (- (/ f-cpu 16 baud) 1))))
+                      (max 0 (round (- (/ f-cpu 16 baud) 1)))))
            (ubrr2 (min 4096
-                       (round (- (/ f-cpu 8 baud) 1))))
+                       (max 0 (round (- (/ f-cpu 8 baud) 1)))))
            (actual-baud (/ f-cpu 16 (1+ ubrr)))
            (actual-baud2 (/ f-cpu 8 (1+ ubrr2)))
            (err (* 100 (- (/ actual-baud baud) 1)))
@@ -144,10 +144,10 @@ rates for F_CPU. UBBR is limited to 12 bits."
 rates for Fcy. BRG is limited to 16 bits."
   (dolist (baud *baud-rates*)
     (let* ((brg (min 65536
-                     (max 1 (round (- (/ fcy 16 baud) 1)))))
+                     (max 0 (round (- (/ fcy 16 baud) 1)))))
            (actual-baud (/ fcy 16 (1+ brg)))
            (err (* 100 (- (/ actual-baud baud) 1))))
-      (when (or (not view-below-percent) 
+      (when (or (not view-below-percent)
                 (< (abs err) view-below-percent))
         (format t "~6D ~4D ~5,1F%~%" baud brg err)))))