18 Aug
2011
18 Aug
'11
11:17 p.m.
On 08/18/2011 10:24 PM, Kevin Redon wrote:
Hi,
I think I found a small hardware bug while fixing the v1.0p boards
(adding a 100nF capacitor near the LDO pin 4).
When I want to put the SAM7S in SAM-BA mode (shorting TEST and 3.3V
pins), it does not work, even after waiting a lot of time.
The 2 LEDs are on, and when I touch PA0 (pin 48 on the right upper
corner of the SAM7S, near the "A") with a piece of metal, the LEDs
switch off and putting into SAM-BA mode works.
maybe PA0 needs to be low/up but it is not connected and probably floating.
The solution is easy, but should we correct that for the next version
(if it is a real bug)?
Interesting, I asked questions about the default state of PA0,PA1 and PA2 in
the 'TST PIN and...'. So the SAM7 datasheet in the git repo says that:
PA0-PA... default is: 'Pulled-up input at reset'. Sorry, I am a noob with HW
but even with PA0 not connected... it should be pulled up and be a logical
one? Did you check if there is a more recent version of the datasheet?