Avr Dragon Schematic10/14/2020
What can be essential to note here is that in screening the memory space, I feel also examining the AT16V8 address decoder.I published a little Z .80 program and loaded it into RAM for the Z80 to run and it works as expected.The system is simple, stuff some bytes tó the AVRs I0 port tackle and perform the same for the 82C55s IO slot address.
The purpose was to end up being capable to test the IO port decoding in thé ATF16V8 PLD and test the programmable wait-state power generator, which is induced by the Z80s access to the AVRs IO address. These functions function as anticipated and I will publish on that later. Although I have written program code for one task in Chemical, I feel not G fluent, hence I have always been leaning towards pure assembly vocabulary, which I have always been quite comfortable developing in. I have already performed this for another project and it supports 32-bit quantities as parameters to the commands. Still, its a little bit of a job and I would not really blend this into the AttoBASIC supply code. Ive done this béfore BUT the SDcárd library utilizes a great deal of regional variables and internal management. Nevertheless, the DS3231 user interface is easy plenty of that it would be less difficult to write my own code for it. There are usually several functional pads that need to be examined, both on thé AVR and thé Z80 support circuitry. Always getting to configure, reconfigure, adobe flash, test, debug, fix program code, re-flash and do it all over again. Those current debug cycles on ány FLASH-baséd MCU can become very time consuming, which I wanted out ways to reduce the time. ![]() With some adjustments to the code, I was capable to completely support the TWI ánd SPI interfaces fór the project I has been operating on at the time. Since after that, I have got discovered it to become indispensable in analyzing new hardware gadgets and preliminary hardware screening when an AVR will be the embedded microcontroller on a particular project, like as this Z80 SBC. It furthermore helps to become the AttoBASIC maintainér (since 2011) as I know the system well sufficient to include support for any function if I find I have got a want for it. For the following initial hardware tests, I possess been using AttoBASIC and to provide others with examples, I will offer each system listing that has been utilized for the tests. I desired to leave the JTAG interface and some AD channels obtainable, hence PORTF was not completely accessible. The 74HM299 is certainly an 8-little bit universal change register with 3-condition outputs. It should work the exact same on the AT90USB1286 but I wished to end up being certain and it did. Its a basic program; initialize all ports to their appropriate state, setup TIMER 2 as the Z80 clock source and generate a pulse on the Z80 CLK RST pin. I then made a decision to expand upon that by testing the RAM with the Z .80 in-circuit. After all, that will be the last objective, to use the AVR as a web host controller with the Z80 in-circuit. Below is definitely the reasoning analyzers capture of the AttoBASIC plan that is usually testing Memory.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |