release lab1

commit 476d939c2a616d82d1255e19d4432fc0ee19bbc0
Author: jenniferlin0902 <[email protected]>
Date:   Mon Jan 14 09:20:09 2019 -0800

    release lab1

Author: jenniferlin0902

_data/unreleased.csv

@@ -1,6 +1,5 @@
 permalink,title,released
 "/labs/lab4/","Lab 4: Linked and Loaded",false
-"/labs/lab1/","Lab 1: Setup your Raspberry Pi",false
 "/labs/lab5/","Lab 5: Keyboard Surfin",false
 "/labs/projectlab1/","Project Lab 1: What is Your Project?",false
 "/labs/lab3/","Lab 3: Debugging and Testing",false

labs/lab1/README.md

@@ -0,0 +1,14 @@
+---
+permalink: /labs/lab1/checkin/
+title: 'Lab 1: Check-in'
+---
+
+1. How much current flows through the LED?
+
+2. What is the offset in bytes where e3 occurs in blink.bin?
+
+3. Show us that you are able to use bootloader to send a program to the Pi. Your success confirms you are ready for action -- way to go!
+
+4. How can you use the blink program to experimentally estimate the number of instructions per second executed by the ARM processor in the Raspberry Pi?
+
+Don't forget to return all tools to the shelves & leave your workspace as clean as you left it.

labs/lab1/checkin.md

@@ -0,0 +1,5 @@
+Blink an LED 
+
+Blink the LED connected to GPIO 20.
+
+

labs/lab1/code/blink/README.md

@@ -0,0 +1,42 @@
+.equ DELAY, 0x3F0000
+
+// configure GPIO 20 for output
+ldr r0, FSEL2
+mov r1, #1
+str r1, [r0]
+
+// set bit 20
+mov r1, #(1<<20)
+
+loop: 
+
+// set GPIO 20 high
+ldr r0, SET0
+str r1, [r0] 
+
+// delay
+mov r2, #DELAY
+wait1:
+    subs r2, #1
+    bne wait1
+
+// set GPIO 20 low
+ldr r0, CLR0
+str r1, [r0] 
+
+// delay
+mov r2, #DELAY
+wait2:
+    subs r2, #1
+    bne wait2
+
+b loop
+
+FSEL0: .word 0x20200000
+FSEL1: .word 0x20200004
+FSEL2: .word 0x20200008
+SET0:  .word 0x2020001C
+SET1:  .word 0x20200020
+CLR0:  .word 0x20200028
+CLR1:  .word 0x2020002C
+

labs/lab1/code/blink/blink.s

@@ -0,0 +1,6 @@
+Use a button to control an LED.
+
+The button is connected to GPIO 10.
+
+The LED is connected to GPIO 20.
+

labs/lab1/code/button/README.md

@@ -0,0 +1,44 @@
+// configure GPIO 10 for input
+ldr r0, FSEL1
+mov r1, #0
+str r1, [r0]
+
+// configure GPIO 20 for output
+ldr r0, FSEL2
+mov r1, #1
+str r1, [r0]
+
+// bit 10
+mov r2, #(1<<10)
+
+// bit 20
+mov r3, #(1<<20)
+
+loop: 
+	// read GPIO 10 
+	ldr r0, LEV0
+	ldr r1, [r0] 
+	tst r1, r2
+	beq on // when the button is pressed (goes LOW), turn on LED
+        
+        // set GPIO 20 low
+    off:
+        ldr r0, CLR0
+        str r3, [r0]
+        b loop
+
+        // set GPIO 20 high
+    on:
+        ldr r0, SET0
+        str r3, [r0]
+        b loop
+
+FSEL0: .word 0x20200000
+FSEL1: .word 0x20200004
+FSEL2: .word 0x20200008
+SET0:  .word 0x2020001C
+SET1:  .word 0x20200020
+CLR0:  .word 0x20200028
+CLR1:  .word 0x2020002C
+LEV0:  .word 0x20200034
+LEV1:  .word 0x20200038