UT.6.01

C1 Bevezetés

Folyamatosan gyűjtöm az anyagokat és fordítom, ahogy lehet

C2 Alap fogalmak

Hexadecimális számok

Hex Digit	Decimal  Value	Binary Value
0	0	0000
1	1	0001
2	2	0010
3	3	0011
4	4	0100
5	5	0101
6	6	0110
7	7	0111
8	8	1000
9	9	1001
A or a	10	1010
B or b	11	1011
C or c	12	1100
D or d	13	1101
E or e	14	1110
F or f	15	1111

Beágyazott rendszerek

Processzor típusok: x86 (ált. asztali gép), ARM.
"Az I/O az a ragasztó, amivel a processzor kapcsolódik a világhoz."
Tervezési szempontok: tesztelhetőség, haszon, energia igény, méret, megfelelő válasz megfelelő időben.
Human-computer interface (HCI) or man-machine interface (MMI).
Tipikus példa: multiméter.

Bevezetés a számítógépekhez

Neumann architecture

Számítógép = proceszor + RAM + ROM + IO.
Neumann architecture, "A port is a physical connection between the computer and its outside world. Ports allow information to enter and exit the system."
"A bus is a collection of wires used to pass information between modules."

A busz vezetékek gyűjteménye, amit a modulok közti információ cserére használunk.

Harvard architecture

ARM®Cortex™-M processor. "separate data and instruction buses"

Külön adat, és utasítás buszok.

"The nested vectored interrupt controller (NVIC) manages interrupts, which are hardware-triggered software functions. " A beágyazott irányítható megszakítás-vezérlő - NVIC

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Fogalmak

A microprocessor is a small processor.

A microcomputer is a small computer that includes a processor, memory and I/O devices.

A microcontroller is a single chip computer.

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CPU regiszterek

ISA Instruction set architecture

MEMORY MAP LAYOUT

RAM (random access memory)

ROM (read only memory)
ROM-ok:

Static RAM (SRAM)

Programmable ROM (PROM) 10000 times slower RAM

Electrically erasable programmable ROM (EEPROM)

"In regular EEPROM, you can erase and program individual bytes. "

FLASH ROM

"Flash ROM is a popular type of EEPROM. Each flash bit requires only two MOSFET transistors. The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years."

"Each flash bit requires only two MOSFET transistors The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years. The other transistor is used to read the bit by sensing whether or not the other transistor has trapped charge."

"Flash ROM must be erased in large blocks. On many of Stellaris family of microcontrollers, we can erase the entire ROM or just a 1024-byte block."

"Because flash is smaller than regular EEPROM, most microcontrollers have a large flash into which we store the software. For all the systems in this class, we will store instructions and constants in flash ROM and place variables and temporary data in static RAM."

"Flash ROM is higher density because it requires few transistors compared to RAM."

Software

CortexM_InstructionSet.pdf Instruction Set Reference Manual https://courses.edx.org/c4x/UTAustinX/UT.6.01x/asset/CortexM_InstructionSet.pdf

CortexM4_TRM_r0p1.pdf Cortex-M4 Technical Reference Manual https://courses.edx.org/c4x/UTAustinX/UT.6.01x/asset/CortexM_InstructionSet.pdf

LaunchPadUsersManual.pdf LaunchPad Manual

tm4c123gh6pm.pdf Data Sheet for the TM4C123 microcontroller

C3 Elektronikai alapismeretek

Ohm törvény

R = V / I

I = V / R

R = V / I

P = V * I   Power = Voltage  * Current

P = V2 / R  Power = Voltage2 / Resistance           

P = I2 * R  Power = Current2 * Resistance

Energia

Elemekre:

E (energia)= V (feszültség) * I (áramerősség) * time (idő)

E-> állandó ; V -> állandó, az idő vagy az I csökkentésével csökkenthetjük a felhasznált energiát.

C4 Digitális logikai műveletek

D Logikai műveletek

A	B	AND	NAND	OR	NOR	EOR	Ex NOR
0	0	0	1	0	1	0	1
0	1	0	1	1	0	1	0
1	0	0	1	1	0	1	0
1	1	1	0	1	0	0	1
Symbol		A&B	~(A&B)	A|B	~(A|B)	A^B	~(A^B)

Boolean Algebra

A & B = B & A A | B = B | A (A & B) & C = A & (B & C) (A | B) | C = A | (B | C) (A | B) & C = (A & C) | (B & C) (A & B) | C = (A | C) & (B | C) A & 0 = 0 A | 0 = A A & 1 = A A | 1 = 1 A | A = A A | (~A) = 1 A & A = A A & (~A) = 0 ~(~A) = A ~(A | B) = (~A) & (~B) ~(A & B) = (~A) | (~B)

Commutative Law Commutative Law Associative Law Associative Law Distributive Law Distributive Law Identity of 0 Identity of 0 Identity of 1 Identity of 1 Property of OR Property of OR Property of AND Property of AND Inverse De Morgan’s Theorem De Morgan’s Theorem

Large numbers reference

Value	SI          Decimal	SI          Decimal		Value	IEC          Binary	IEC          Binary
10001	k	kilo-		10241	Ki	kibi-
10002	M	mega-		10242	Mi	mebi-
10003	G	giga-		10243	Gi	gibi-
10004	T	tera-		10244	Ti	tebi-
10005	P	peta-		10245	Pi	pebi-
10006	E	exa-		10246	Ei	exbi-
10007	Z	zetta-		10247	Zi	zebi-
10008	Y	yotta-		10248	Yi	yobi-

C4 Beveztés a C-be

Háttér

A C nagyon népszerű nyelv (2013-ban a programok 18%), több programot írnak C-ben mint Javaban, PHP-ben, Python-ban vagy Perl-ben.
Szintén nagyon népszerű még Objective-C és a C++ is.

A C nagyon vas közeli, a beágyazott rendszerek pedig az I/O-kra (GPIO-kra) épülnek.

A C felépítése

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Punctuation	Meaning
;	End of statement
:	Defines a label
,	Separates elements of a list
( )	Start and end of a parameter list
{ }	Start and stop of a compound statement
[ ]	Start and stop of a array index
" "	Start and stop of a string
' '	Start and stop of a character constant

Variables (változók)

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Data type	Precision	Range
unsigned char	8-bit unsigned	0 to +255
signed char	8-bit signed	-128 to +127
unsigned int	compiler-dependent
int	compiler-dependent
unsigned short	16-bit unsigned	0 to +65535
short	16-bit signed	-32768 to +32767
unsigned long	unsigned 32-bit	0 to 4294967295L
long	signed 32-bit	-2147483648L to 2147483647L
float	32-bit float	±10-38 to ±10+38
double	64-bit float	±10-308 to ±10+308