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<h1 id="csce-462">CSCE 462</h1>
<h1 id="soc">SOC:</h1>
<ul>
<li>System On a Chip</li>
</ul>
<h1 id="latency-vs-throughput">Latency vs Throughput</h1>
<ul>
<li>latency: time to complete one operation</li>
<li>throughput: operations per second</li>
<li>memory has both latency and throughput</li>
</ul>
<h1 id="gpio">GPIO</h1>
<ul>
<li>General Purpose Input/Output</li>
<li>sometimes called "Port A"</li>
</ul>
<h1 id="raspberry-pi-3">Raspberry Pi 3</h1>
<ul>
<li>1.2GHz 4-core processor</li>
<li>1GB RAM</li>
<li>40 board pins, 26 are GPIO</li>
<li>WiFi, Ethernet</li>
</ul>
<h1 id="positive-vs-negative-logic">positive vs negative logic</h1>
<ul>
<li>positive logic
<ul>
<li>AKA pull down resistor</li>
<li>switch:
<ul>
<li>resistor from GPIO to ground</li>
<li>switch from Vcc to GPIO</li>
</ul></li>
<li>LED: resistor and LED in series between GPIO and ground</li>
</ul></li>
<li>negative logic
<ul>
<li>AKA pull up resistor</li>
<li>switch:
<ul>
<li>resistor between GPIO and Vcc</li>
<li>switch between GPIO and ground</li>
</ul></li>
<li>LED: resistor and LED in series between GPIO and Vcc</li>
</ul></li>
<li>in all cases, LED must be oriented correctly (pointing toward lower voltage)</li>
<li>GPIO should only be used for less than 8mA
<ul>
<li>if LED or something needs more than that, connect it to an inverter, then connect the LED using the other kind of logic (positive/negative)</li>
</ul></li>
<li>typically use about 10k Ohm resistor with switches</li>
</ul>
<h1 id="arm">ARM</h1>
<ul>
<li>link register: stores return address of function
<ul>
<li>means that leaf function calls are faster</li>
</ul></li>
<li>flag bits
<ul>
<li><code>c</code> carry (unsigned overflow)
<ul>
<li><code>c</code> set after unsigned addition => overflow</li>
<li><code>c</code> <strong>NOT</strong> set after unsigned subtraction => overflow</li>
</ul></li>
<li><code>v</code> overflow (signed overflow)
<ul>
<li><code>v</code> set after signed addition => overflow</li>
<li><code>v</code> set after signed subtraction => overflow</li>
</ul></li>
<li><code>z</code> zero</li>
<li><code>n</code> negative</li>
<li><code>p</code> parity
<ul>
<li>just xor of all bits together</li>
</ul></li>
<li>flags set after every instruction?</li>
</ul></li>
<li><a href="http://www.peter-cockerell.net/aalp/html/ch-2.html" class="uri">http://www.peter-cockerell.net/aalp/html/ch-2.html</a></li>
<li><a href="http://www.peter-cockerell.net/aalp/html/ch-3.html" class="uri">http://www.peter-cockerell.net/aalp/html/ch-3.html</a></li>
<li>instruction format: <code>add{cond}{s} <dest>, <lhs>, <rhs></code>
<ul>
<li><code>s</code>, if present, means the instruction can change processor flags (e.g. over/underflow)</li>
</ul></li>
<li><code>ldr</code>: load word (to register)</li>
<li><code>str</code>: store word
<ul>
<li>load/store can have suffix to do non-32-bit sizes:
<ul>
<li><code>b</code>: byte</li>
<li><code>h</code>: half-word (16 bits)</li>
</ul></li>
<li><code>ldr Rd, =label</code> (pseudo-instruction): loads address of label into register</li>
</ul></li>
<li>16 registers: <code>R0</code>-<code>R15</code>, and <code>CPSR</code>
<ul>
<li><code>R0</code>-<code>R3</code>: arguments to function call, and return value</li>
<li><code>R12 IP</code>: Intra procedural call</li>
<li><code>R13 SP</code>: Stack Pointer</li>
<li><code>R14 LR</code>: Link Register
<ul>
<li>stores return address</li>
</ul></li>
<li><code>R15 PC</code>: Program Counter
<ul>
<li>you can read/write to this directly, it's not special (though not a good idea)</li>
</ul></li>
<li><code>CPSR</code>: Current Program State Register:
<ul>
<li>stores flags about the state of the program: negative, zero, carry, overflow, underflow, privileged mode, etc...</li>
<li>can be modified directly (want to do read-modify-write state backup first)</li>
</ul></li>
<li><code>R4-R11</code> and <code>R13 SP</code> are callee preserved: function should push during prologue and pop in epilogue of function</li>
<li>callee must preserve <code>R14 LR</code> if it wishes to call subroutines</li>
<li><code>R12 IP</code> is weird. Used for libraries as stack space?</li>
</ul></li>
<li><code>push</code>/<code>pop</code> for accessing stack
<ul>
<li><p>you can push/pop multiple things at once, but you need to reverse at the end:</p>
<pre><code>push {ip, lr, sp}
pop {sp, lr, ip}</code></pre></li>
</ul></li>
<li><code>bl</code>: branch and link (set link register). use to call subroutines</li>
<li><code>bx lr</code>: branch to link register, to return from subroutine</li>
<li>constants: <code>mov r1, =label</code>
<ul>
<li>can do <code>ldr r0, =0x523</code> (translates to <code>PC</code> relative load)</li>
</ul></li>
<li>literal: <code>mov r0, #5</code>, <code>mov r2, #0x1C</code></li>
<li>memory access: <code>ldr r0 [r0]</code>, <code>str r0 [r1, #offset]</code>
<ul>
<li>memory access is sometimes done relative to <code>PC</code></li>
</ul></li>
<li><code>bic {Rd,} Rn, <op2></code>: bit-clear. Clears all bits in <code>Rd</code> that are set in <code>Rn</code>. Equivalent to <code>Rd = Rn & (~op2)</code></li>
</ul>
<h1 id="powers-of-two">powers of two:</h1>
<ul>
<li><span class="math inline">\(2^{10}\)</span> is 1K</li>
<li><span class="math inline">\(2^{20}\)</span> is 1M</li>
<li><span class="math inline">\(2^{30}\)</span> is 1G</li>
</ul>
<h1 id="systick-timer">SysTick timer</h1>
<ul>
<li>24-bit timer that counts down at bus clock frequency</li>
<li>only counts down</li>
<li>control registers (memory mapped)
<ul>
<li><code>ctrl</code>: control
<ul>
<li>can have different sources (but is always internal on raspberry pi)</li>
<li>bit 16: COUNT bit
<ul>
<li>1 if current value has been 0 since the last time you read ctrl register</li>
<li>0 otherwise</li>
</ul></li>
<li>enable bit to start timer (bit 0)</li>
</ul></li>
<li><code>reload</code>: value to start at (after counting wraps)</li>
<li><code>current</code>: current value timer is counting at
<ul>
<li>whenever you write to this, no matter what you write, it resets the counter</li>
</ul></li>
</ul></li>
</ul>
<h1 id="finite-state-machine-fsm">Finite State Machine (FSM)</h1>
<ul>
<li>Mealy vs Moore
<ul>
<li>Moore
<ul>
<li>output on states</li>
<li>output based on current state only</li>
</ul></li>
<li>Mealy
<ul>
<li>output on state transitions (edges of graph)</li>
<li>output based on state and current input</li>
</ul></li>
</ul></li>
<li>can have wait time at each state</li>
<li>can be implemented like a linked list (or other ways)</li>
<li>implementation
<ul>
<li>linked list: pointers link to adjacent nodes</li>
<li>table: stores indexes of adjacent nodes</li>
</ul></li>
<li>if you implement with a data structure, you need a driver function to advance states and whatnot</li>
<li>data structure implementation seems way over complicated</li>
</ul>
<h1 id="software-abstraction">Software abstraction</h1>
<ul>
<li>Define a problem with a minimal set of basic, abstract principles / concepts</li>
<li>Separation of concerns via interface/policy mechanisms</li>
<li>Straightforward, mechanical path to implementation</li>
<li>advantages
<ul>
<li>faster to develop</li>
<li>easier to debug</li>
<li>easier to change</li>
</ul></li>
</ul>
<h1 id="exam-2-material">exam 2 material</h1>
<!-- stuff not on exam 1 -->
<!--
# interrupts
* generated externally or internally
* external: IO device (e.g. keyboard)
* internal, e.g. exception, syscall
* each interrupt source has two bits:
* arm bit: allow that interrupt to be triggered
* flag bit: hardware sets this flag to throw interrupt, software clears flag when it starts handling the interrupt
* interrupts are prioritized
* against each other and against current state of CPU
* PRIMASK: interrupt priority mask register
* there is a global interrupt enable/disable flag
* acknowledge interrupt means clear flag bit and begin handling interrupt
* can set other bit to enable/disable interrupts by source
* interrupt program status register IPSR: stores info about current interrupt
* interrupt service routine ISR: called by CPU when interrupt happens
* TODO is there a separate one per interrupt?
-->
<h1 id="adc-analog-to-digital-converter">ADC: Analog to Digital Converter</h1>
<ul>
<li>4 limitations
<ul>
<li>finite precision</li>
<li>finite voltage range</li>
<li>discrete sampling frequency</li>
<li>finite number of samples</li>
</ul></li>
</ul>
<h1 id="uart">UART</h1>
<ul>
<li>Universal asynchronous receiver-transmitter</li>
<li>has a FIFO buffer in case software doesn't read it fast enough</li>
<li>UART can generate interrupts at various levels of buffer filled on receive</li>
</ul>
<h1 id="spi">SPI</h1>
<ul>
<li>multiple slaves, single master</li>
<li>synchronized (has a clock)</li>
<li>always full duplex</li>
<li>daisy chain-able</li>
<li>pins
<ul>
<li><strong>MOSI:</strong> master out slave in</li>
<li><strong>MISO:</strong> master in slave out</li>
<li><strong>SCLK:</strong> master clock</li>
<li><strong>SS_BAR:</strong> unique line to select slave</li>
</ul></li>
</ul>
<h1 id="i2c">I2C</h1>
<ul>
<li>half duplex</li>
</ul>
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