Dogbone06
Well-known member
Hey!
I just received a batch of custom boards with the PJRC bootloader. I've done this many many times.
But this batch, gives 4 blinks for some reason. I've tried swapping out the 24MHz crystal from a working board just in case. No luck.
I wanna try to swap the bootloader in case the factory (for some reason) used blank chips instead of using bootloaders from my stock (which I got from PJRC).
But the question is: Is the NXP fused now to the bootloader or is it not since we get the 4 blinks?
"4 Blinks = ARM JTAG & SWD Not Responding (Needs Crystal)The NXP JTAG communication is working, but communication with ARM JTAG or SWD fails. Usually this error means the 24 MHz crystal is not oscillating. NXP's JTAG does not require the oscillator, but the ARM JTAG does. This error also be caused by a bad connection between PTB5 to AD_B0_08, which is the signal that selects which JTAG controller is accessible."
EDIT: After trial and eror it turns out that it's something around the crytal. Not the crystal itself but some component. I am narrowing it down.
In other words, I got one board working by taking a few things from a working board.
I just received a batch of custom boards with the PJRC bootloader. I've done this many many times.
But this batch, gives 4 blinks for some reason. I've tried swapping out the 24MHz crystal from a working board just in case. No luck.
I wanna try to swap the bootloader in case the factory (for some reason) used blank chips instead of using bootloaders from my stock (which I got from PJRC).
But the question is: Is the NXP fused now to the bootloader or is it not since we get the 4 blinks?
"4 Blinks = ARM JTAG & SWD Not Responding (Needs Crystal)The NXP JTAG communication is working, but communication with ARM JTAG or SWD fails. Usually this error means the 24 MHz crystal is not oscillating. NXP's JTAG does not require the oscillator, but the ARM JTAG does. This error also be caused by a bad connection between PTB5 to AD_B0_08, which is the signal that selects which JTAG controller is accessible."

EDIT: After trial and eror it turns out that it's something around the crytal. Not the crystal itself but some component. I am narrowing it down.
In other words, I got one board working by taking a few things from a working board.
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