Thanks!
If you don't mind, I would also like to ask you regarding the EEPROM.
Is it currently being used by the board or is it also implemented for
expansion purposes? I thought it might have been used for storing prefences
to be loaded but apparently from the comments its eems to be done from
Flash rather than the external EEPROM.
If it is used was it implemented because of a lack of on-board memory on
the STM32F4? Might you know how much memory is consumed as the SM1000 is
running and how I could verify it?
Kindest regards and sorry for any bother.
On Wed, Mar 7, 2018 at 9:43 PM, David Rowe <da...@rowetel.com> wrote:
> Hi Jacob,
>
> 1/ Test is an unused feature at present, you can treat it like a GPIO
>
> 2/ We use an opto-isolator so we don't have to provide a switch to the
> external radios PTT circuit. An electro-mechanical relay would have been
> an alternative. It's usually a mechanical switch on your PTT mic.
> - David
>
> On 08/03/18 00:22, Jacob Falzon wrote:
>
>> Hello again,
>>
>> there are another two pins for the SM1000 that I wanted to know more
>> about.
>>
>> The Test pin connects to a Self-Test circuit. What exactly is this used
>> to test for please?
>> Also there is another pin named CPPT that connects to an optoisolator. I
>> understand that the CPPT signal is used to trigger the PTT for the radio
>> but why is the opto-isolator implemented please?
>>
>> Thank you very much for your attention.
>>
>> Kindest regards,
>>
>>
>>
>> On Sat, Feb 24, 2018 at 9:01 PM, Jacob Falzon <jacobfalzon2...@gmail.com
>> <mailto:jacobfalzon2...@gmail.com>> wrote:
>>
>> Thank you very much for your attention.
>>
>> Have a good night!
>>
>> On 24 Feb 2018 8:26 PM, "David Rowe" <da...@rowetel.com
>> <mailto:da...@rowetel.com>> wrote:
>>
>> Hi Jacob,
>>
>> These pins are just broken out as GPIOs or for future expansion.
>>
>> - David
>>
>> On 25/02/18 00:54, Jacob Falzon wrote:
>>
>> Hi there,
>>
>> i was looking at the schematic and I came upon the SPI pins
>> and the UART pins in the schematic.
>>
>> The SPI pins ( SCK, MOSI, MISO, NSS) do not seem to be
>> connected with an external component. What is their purpose?
>>
>> Also the UART pins whilst available are they currently
>> utilised for some purpose?
>>
>> Many thanks for your kind attention.
>>
>> Regards,
>>
>>
>>
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