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I'm trying to program the chip via serial based on requirements for my project so I'm stuck with using the max232. Is there anything to convert from UART to SPI directly? or would I have to purchase something like a MAX3100 to interface with the Atmel? Also, the reason I'm using SPI is because I...
I'm trying to connect my RS232 with MAX232 to my ATMega32 (http://www.atmel.com/Images/8272S.pdf) for ISP but I think I must be missing a component. If I'm going to do ISP, do I need something to convert the UART from RS232 to interface with SPI? What would I use to do this? Is there a chip that...
Doesn't a bootloader require that the chip be restarted aka powered off and on? I'm trying to remotely re-program this chip so I want compile the hex files locally, then send the hex files to a remote (linux) machine that has a service running. This service realizes new files have come in and...
I want to be able to rewrite the program stored in flash on my ATMega32 with a new program via a serial connection. Is there a way to do this without having to rely on a programmer? For example, could I write a program on the ATmega that when it gets a certain message on the serial port, the...
So with my ATMega32, it considers anything between 0-0.8V as logical 0s and 2.2-5V as logical 1s as well. This why a TTL converter is needed (via MAX232). However, my PC looks at higher voltage levels as logical 0s and 1s. So TTL is really a voltage translation between the PC (or other device)...
I've seen a lot of blog posts about using a RS232 with MAX232 for TTL serial conversion for microcontrollers. However, I'm not sure why we choose to use this. Does anybody know why TTL conversion is useful and when to use it? In my case my serial connection goes to an ATMega32. Couldn't I just...
I'm trying to output a message from an ATMega32 every five seconds via a serial (RS232) port. I'd like program the ATMega through the serial port as well. How would I be able to do this? Would this mean I would need a bootloader? I just want to be able to flash a new program using the serial...
Hello Everyone, I'm a novice starting a project to create my own prototype to create a simple NFC reader. I wanted some design advice from the pro community in this matter. I know that I will need an MCU connected to a PN532 but there are a few goals I'm not sure how to address:
1) I want to be...
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