# 93lc66b(raspberry pi zero)

目的:實現簡易的讀寫

# 93lc66b(raspberry pi)
硬體平台:raspberry zero
目的:對93lc66b實現簡易讀寫

## 接線圖


CS-GPIO8
DI-GPIO10
DO-GPIO9
CLK-GPIO11
ORG-GPIO4
VCC-3.3V
VSS-GND

## 腳本測試
使用以下腳本程式測試

#!/bin/bash

cs=/sys/class/gpio/gpio8/value
clk=/sys/class/gpio/gpio11/value
miso="cat /sys/class/gpio/gpio9/value"
mosi=/sys/class/gpio/gpio10/value
org=/sys/class/gpio/gpio4/value

array=(1 0 1 0 0 0 0 0 0 0 0)
array_rd=(1 1 0 0 0 0 0 0 0 0 0)
dat=(1 0 1 0 1 0 1 1 1 0 1 1 1 0 1 0)

function spi_init(){
echo 4 > /sys/class/gpio/export
echo 8 > /sys/class/gpio/export
echo 9 > /sys/class/gpio/export
echo 10 > /sys/class/gpio/export
echo 11 > /sys/class/gpio/export
sleep 0.5
echo in > /sys/class/gpio/gpio9/direction
echo out > /sys/class/gpio/gpio4/direction
echo out > /sys/class/gpio/gpio8/direction
echo out > /sys/class/gpio/gpio10/direction
echo out > /sys/class/gpio/gpio11/direction
#echo 0 > $cs
#echo 0 > $clk
#echo 0 > $mosi
}

function spi_exit(){
echo 4 > /sys/class/gpio/unexport
echo 8 > /sys/class/gpio/unexport
echo 9 > /sys/class/gpio/unexport
echo 10 > /sys/class/gpio/unexport
echo 11 > /sys/class/gpio/unexport
}

function write(){
echo "write start"
echo 1 > $cs
for i in {0..10} 
do
  echo 0 > $clk
#  echo ${array[$i]}
  echo ${array[$i]} > $mosi
  sleep 0.000010
  echo 1 > $clk
  sleep 0.000010
done
for i in {0..15}
do
  echo 0 > $clk
#  echo ${dat[$i]}
  echo "${dat[$i]}" > $mosi
  sleep 0.000010
  echo 1 > $clk
  sleep 0.000010
done
echo 0 > $cs
sleep 0.000010
#while [ $($miso)==1 ]
#do
#echo busy
#done
}
function read_mem(){
echo "read start"
echo 1 > $cs
for i in {0..10} 
do
  echo 0 > $clk
#  echo ${array[$i]}
  echo ${array_rd[$i]} > $mosi
  sleep 0.000010
  echo 1 > $clk
  sleep 0.000010
done
for i in {0..15}
do
  echo 0 > $clk
#  echo ${dat[$i]}
#  echo "${dat[$i]}" > $mosi
  echo $($miso)
  sleep 0.000010
  echo 1 > $clk
  sleep 0.000010
done
echo 0 > $cs
}

spi_exit
spi_init
echo 1 > $org
if [ $1 -eq 1 ]
then
 write
elif [ $1 -eq 2 ]
then
 read_mem
else
 echo none
fi
#write
#read_mem
echo 0 > $org
#spi_exit

寫入和讀出的資料不同，目前看來結果是錯誤的(未完成)。
下一步會嘗試製作成**洞洞板**讓之後便於外接**邏輯分析儀**驗證溝通的界面信號是否正確。
參考資料:
[datasheet](http://ww1.microchip.com/downloads/en/DeviceDoc/21795b.pdf)

###### tags: `raspberry pi`