[Arm-netbook] Testing: GPIO

[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Thu, Mar 1, 2018 at 8:33 PM, Richard Wilbur <richard.wilbur at gmail.com> wrote:
> On Wed, Feb 28, 2018 at 2:41 PM, Luke Kenneth Casson Leighton
> <lkcl at lkcl.net> wrote:
>> On Wed, Feb 28, 2018 at 9:09 PM, Richard Wilbur
>> <richard.wilbur at gmail.com> wrote:
>>> After realizing that you mentioned all 8 GPIO lines were on the 20-pin
>>> expansion header J5 in the microdesktop case, I consulted the
>>> microdesktop schematic for clues.
>>>
>>> I suspect the UART and EOMA I2C pins should be left to those functions.
>>
>>  yehyeh.   UART implicitly tested "if console works it's probably
>> good" and I2C with a bus scan, i2c-utils, if 0x51 EEPROM shows up,
>> it's good.
>>
>>> I have added tables to the "Testing"[*] page under the "GPIO" section
>>> with my nominations for which pins to test and their mapping back to
>>> A20 register bits.
>>
>>  awesome.  it'll have to be done manually for now,
>
> Are you suggesting that the testing "will have to be done manually"?

 the mapping created manually.  sorry, i was thinking in terms of
device-tree fragments... which don't exist yet.

> What is the time frame of "for now"?

 when testing is required.

> I'm trying to figure out which pins of the expansion header we want to
> test, which pins of the processor those correspond to, and thus which
> registers and bits of those registers we need to manipulate.  That
> determines how I need to interact with the GPIO driver.

 yehyeh.  and determining that interaction "has to be done manually".
if the devicetree fragment existed it would be a much simpler matter.

>>> Luke, does this match your understanding of the GPIO pins to test?
>>
>>  yep - GPIO_19,20,21 missing.
>
> In the following table (created while I was trying to figure out which
> GPIO were connected in the EOMA standard) you will see that EOMA nets
> GPIO(18)/EINT3, GPIO(19), GPIO(20), and GPIO(21) are not connected on
> the microdesktop schematic v1.7 from J14.  Thus they are at J14 but
> not available anywhere else in the microdesktop v1.7.

 yep, forgot that.  why the heck did i leave them out??  duur...


> 1342 Fri 23 Feb 2018:
> EOMA      A20           DS113      microdesktop
> Net Name  ball register CON15 pin  J14 pin
> PWM        B19   PI3      43         22  GPIO(10)
> EINT0      A6    PH0      63         32  GPIO(11)
> EINT1      B6    PH1      17          9  GPIO(16)
> EINT2      B2    PH14     44         56  PWFBOUT GPIO(17)
> EINT3      C2    PH18     39         20  NC GPIO(18)
> GPIO(19)   A1    PH15     40         54  NC
> GPIO(20)   C1    PH17     41         21  NC
> GPIO(21)   B1    PH16     42         55  NC
>
> We could obviously create a v1.8 schematic for the microdesktop and
> connect these EOMA nets to a header, if desired.

 yes.  damn.  i think it's probably that i didn't update the
micro-desktop schematic when i changed the EOMA68 spec from 24-pin to
18-pin RGB/TTL.

l.