Classical Drawing Atelier Pdf To Word. Chip45boot2 is a professional bootloader for Atmel AVR ATmega Xmega microcontrollers with Intel hex file support and automatic baudrate adjustment. (command 'g') to avoid loss of XON transmission due to possible uart init in user application; V2.90: renamed many variables and functions to indicate the data type and. Firmware programming over USART/SPI/TWI and other serial interfaces. For Atmel PC Bootloader tool to operate correctly as a host over UART it shall get the connection enumerated as a COM. Recommended fuse bits for supported AVR® microcontrollers are given in Table 2-2 and fuse bits for supported XMEGA®.

********************************** * * * AVR Universal Bootloader * * A V R U n i v e r sa l B o o t l o a d e r * * * ********************************** Last modified at 2012.Jue [Bug fixed] There two serious bugs found in V4.5, because new version has not publish, so I fix these bugs first here. In file bootldr.c, add below in line 475 and 499: bufptr -= BUFFERSIZE; It will cause download fail when CRC error. Thank Ben Wilson found and fix this bug. In file bootldr.c, replace lines (*((void(*)(void))(BootStart)))(); to (*((void(*)(void))(BootStart/2)))(); • • • • • • • • • • • • • • Introduction This project is a general AVR bootloader, for different type of AVR device, all you need to do is modify macro definition, and you don not need to modify the main program. There are many bootloader program on internet, but most of them are only available for special types. When we need to use other types device, we must do a lot of modification.

And many of them are only realize the basic functions, and have bugs, hidden problem or may be used inconveniently, so we have developed this program. This project based on ATmega128 bootloader program which developed by Mr ChaoMa, and combined experience in bootloader of PIC18 microcontroller I have wrote before, and used the macro definition skill from AVRUSB, and optimize and test the code time after time, finally get this project. This AVR universal bootloader can support most types of AVR microcontrollers(Mega series), which have self-programable capability, boot section and UART. If the device have many serial ports, you can use any one of them. This bootloader supports RS232, RS485 and RS422. It can also supports USI, SPI, I2C interface if you made some modify.

This bootloader will occupy less than 1k words flash maximum, and it may occupy less than 256 words minimum. The space occupied by the bootloader is relative with device type, configuration parameters, funcations you select, and the optimize grade that the compiler use. Main feature • Support many types of AVR microcontrollers. • Support AVR device with multi-uart. • Support RS232/RS485/RS422 mode. • Support customize communication baudrate and system clock frequcene.

• Automatically calculate the baudrate error. • Write with AVR GCC, 100% C code. • High optimized code, occupy small space.

• Cut out the function conveniently, and can meet different requirements. • Support Watchdog. • User may use the LED to show the upgrade status. • Support to use super terminal as download software on PC. • Support verification while write to FLASH.