Download E-books Networking and Internetworking with Microcontrollers (Embedded Technology) PDF

By Fred Eady

Subtle networking and communications features that have been formerly the only area of mainframes, desktops, and workstations at the moment are turning into vital within the realm of smaller embedded microcontrollers. even though, documentation, criteria, and layout info is scattered between many assets and is tough to discover.

In this sensible ebook, well known columnist and embedded clothier Fred Eady is your advisor and consultant. He pulls jointly all of the helpful layout heritage and information and exhibits you the way to take advantage of today’s reasonable microcontrollers for strong communications and networking functions resembling neighborhood zone networks and embedded net. utilizing operating code examples and schematics, Eady steers you thru the fundamentals utilizing renowned microcontroller households, PIC and Atmel.

Included are a wealth of unique layout examples for:
· RS-232 firmware and hardware
· Microcontroller USARTs
· The I2C bus
· Ethernet implementation
· Embedded net implementation
· instant links

Sample resource code is equipped and punctiliously defined for the entire program examples. The accompanying CD-ROM comprises the instance code in addition to a searchable e-book model of the textual content, that can assist you wake up to hurry speedy. you'll spend days or perhaps weeks pulling jointly the entire details that Eady has assembled during this one crucial reference.

* the one resource that attracts jointly difficult-to-find layout details, and teaches step by step the best way to use it to create robust networking applications
* comprises absolutely practical examples of microcontroller and firmware
* better half cd-rom comprises all schematics and code used in the publication

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106 I2C... the opposite Serial Protocol //; SSPSTAT bits: S = 1, D_A = 1, R_W = 1, BF = zero //; //; nation five: Slave I2C good judgment reset by way of NACK from grasp. //; //; SSPSTAT bits: S = 1, D_A = 1, R_W = zero, BF = zero //; //;---------------------------------------------------//State 1 if(S && ! D_A && ! R_W && BF ) dummy = SSPBUF; //State 2 else if(S && D_A && ! R_W && BF ) { digit = SSPBUF; update_latch = actual; } //State three else if(S && ! D_A && R_W && ! BF ) { index = 0x00; while(BF); do{ WCOL = zero; SSPBUF = numbers[index]; }while(WCOL); ++index; CKP = 1; } //State four else if(S && D_A && R_W && ! BF ) { while(BF); do{ WCOL = zero; SSPBUF = numbers[index]; }while(WCOL); if(++index > 0x04) index = 0x00; CKP = 1; } //State five else if(S && D_A && ! R_W && ! BF ) index = zero; } 107 Chapter 6 void main() { int8 x; SET_TRIS_A(0b11111111); SET_TRIS_B(0b11111111); SET_TRIS_C(0b11111101); SET_TRIS_D(0b00000000); ADCON1 = 0x06; //00000110 all ports set for electronic ADCON0 = zero; update_latch = fake; //****************************************************************** //* INITIALIZE universal VARIABLES //****************************************************************** SSPSTAT = 0x80; SSPCON2 = 0x00; //****************************************************************** //* let SLAVE INTERRUPTS //****************************************************************** enable_interrupts(INT_SSP); enable_interrupts(GLOBAL); //****************************************************************** //* SLAVE major //****************************************************************** do{ { if(update_latch) { output_d(digit); latchdata; update_latch = fake; } } }while(1); } Code Snippet 6. 10: Don’t fear; I’ve integrated the code at the CDROM so that you won’t need to expend your palms typing code. you have already got a great deal with at the innerworkings of the PIC I²C slave code in Code Snippet 6. 10. even if, I’ve thrown within the kitchen sink within the AVR grasp code bobbing up in Code Snippet 6. eleven. So, I’ll holiday it up and talk about the code components as they're encountered. think of the remainder of the code during this bankruptcy as a part of Code Snippet 6. eleven. 108 I2C... the opposite Serial Protocol ////////////////////////////////////////////////////////////////////// // AVR I2C grasp driving force // effortless ETHERNET AVR BOARD // writer: Fred Eady // model: 1. zero // Date: 08/26/03 // Description: RS232 capabilities AND I2C grasp capabilities ////////////////////////////////////////////////////////////////////// #include #include #include #pragma interrupt_handler USART_RX_interrupt:iv_USART_RX #pragma interrupt_handler USART_TX_interrupt:iv_USART_UDRE Code Snippet 6. 11a: There’s not anything the following you can’t discuss intelligently. It seems like we’re going to incorporate a few interrupt pushed RS-232 at the AVR part. The #pragma statements in Code Snippet 6. 11a are a useless giveaway. The affirmation of an RS-232 resurrection is proven in Code Snippet 6. 11b. //****************************************************************** //* functionality PROTOTYPES //****************************************************************** int recvchar( void ); int sendchar( int ); unsigned char CharInQueue(void); void init_USART(unsigned int baud); void twi_init(void); void i2c_start(void); void i2c_write(unsigned char datum); unsigned char i2c_read(unsigned char acknak); void i2c_stop(void); Code Snippet 6.

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