From 7f95ac1927e47d240c6adaadd1286284d2d5c5e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fredrik=20Gr=C3=B6nlund?= <fredrik.gronlund.o@gmail.com>
Date: Wed, 21 Dec 2016 14:45:28 +0100
Subject: [PATCH] Minor change to improve readability.
---
implementation/spi-uwb.tex | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/implementation/spi-uwb.tex b/implementation/spi-uwb.tex
index cdda2bd..a15c13e 100644
--- a/implementation/spi-uwb.tex
+++ b/implementation/spi-uwb.tex
@@ -74,11 +74,10 @@
\item \makebox[2cm][l]{SPICLK:} \makebox[2cm][l]{PB10}
\end{itemize}
- Handling NSS (Slave select) in hardware would be faster and easier.
- An undocumented hardware bug in the STMF7-series processor causes the hardware-managed NSS to malfunction if NSS Pulse was disabled. \cite{web:stm_nss_problem}
+ The NSS pin is handled in software like a standard digital GPIO pin.
+ Handling NSS (Slave select) in hardware would be faster and easier, however an undocumented hardware bug in the STMF7-series processor causes the hardware-managed NSS to malfunction when NSS Pulse is disabled \cite{web:stm_nss_problem}.
An example of NSS Pulse mode can be seen in Figure \ref{pic:NSSP}.
The DW1000 does not support NSS Pulse communication, so software NSS was required.
- The NSS pin is instead handled like a standard digital GPIO pin.
All other SPI is implemented using the HAL\footnote{Hardware Abstraction Layer} libraries supplied by STMicroelectronics for this processor.
\begin{figure}[H]
@@ -212,7 +211,7 @@
At maximum precision (\SI{0.25}{\degree} resolution and 3 byte per point) a total of $\frac{\SI{270}{\degree}}{0.25} = 1080$ data points, resulting in 3240 bytes of data.
This gives
\begin{align*}
- \frac{1080}{90 / 3} = 36\text{ full packages.}
+ \frac{1080}{90 / 3} = 36\text{ packets.}
\end{align*}
--
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