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I'm trying to program an ATF1508 using JTAG signals generated by a microcontroller. I can read the IDCODE myself. When I try to program an SVF file it also includes the instruction to read the IDCODE, which succeeds. It has a few hundred other instructions then reads in data 41 bytes at a time...
The diagram is pretty simple:
Here is the microcontroller code:
while(1)
{
UART_SendHex(UART_Receive(0));
UART_Send(' ');
delay_ms(1000);
}
With a known working FT232 cable the terminal window waits for input. If I type 'a' it prints "61" which is the correct hex value for...
I set up an FT232R on protoboard and now it is acting a little strange. It enumerates fine under Windows 7 when I plug it in but does not loop back data when I connect RX to TX. It was a few months ago when I soldered it on but as I remember it did loop data back at that time. I connected it to...
I have an Atmel AT89LP6440 but no parallel programmer so I made a PC program that uses an FTDI cable in SPI mode to program it instead. This works well and I am able to both program the chip and read back the firmware. The chip uses a synchronous SPI format. Here is the code I have that works...
Although this post is several years old I wanted to post an answer since I recently had the same problem and the answer doesn't seem to exist anywhere else on the internet.
The problem seems to be with some sort of latency in receiving acknowledgement from the chip that each line of the hex...
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