Glad you got it worked out! I typically do this as a union of the UINT32
and a UINT8 array. This DOES rely on the endianness of the processor, so
it's not completely portable. But I think it makes pretty clean code.

Harold


> Awesome, you guys nailed it.
>
> (((uint32_t)=E2=80=99D=E2=80=99) << 24)  does the trick.
>
> Thanks
>
> justin
>
> On 11 August 2018 at 20:37, Michael Graff <explorer@flame.org> wrote:
>
>> I believe you want to cast the characters. Example, from memory vs
>> trial:
>>
>> (((uint32_t)=E2=80=99D=E2=80=99) << 24)
>>
>> The problem seems to be when the arduino 16-bit compiler promotes the
>> char
>> to its longest natural integer size, which is 16 bits. The ESP handles
>> 32
>> bit into natively so chars become the desired length automatically.
>>
>> On the arduino, without casting the target of the shift to a long enough
>> size manually, it basically shifts all the bits off the end and becomes
>> zero. There=E2=80=99s probably a warning about this in your compile logs=
..
>>
>> --Michael (from an iPhone)
>>
>>
>> > On Aug 11, 2018, at 7:09 AM, Jason White <whitewaterssoftwareinfo@
>> gmail.com> wrote:
>> >
>> > Method A: Cast each of the characters to uint32_t and be sure to
>> completely
>> > surround the casted value in parentheses.
>> >
>> > Method B (probably better in my opinion): structure , union, or even
>> just
>> > an array of uint8_t.
>> >
>> > On Saturday, August 11, 2018, Justin Richards
>> <justin.richards@gmail.com
>> >
>> > wrote:
>> >
>> >> Probably best posed in an arduino forum but hoping someone could pick
>> an
>> >> obvious mistake, steer me in the right direction or suggest a better
>> way.
>> >>
>> >> I have generally avoided the << and >> operators but I thought they
>> would
>> >> be ideal to pack a 32bit variable with commands.
>> >>
>> >> So trying this
>> >>
>> >> uint32_t ds =3D ('D'<<24)|('C'<<16) |('B'<<8)|('A');
>> >>
>> >> when compiled for an ESP8266 target in arduino IDE and printed gives
>> >>
>> >> 0x44434241 as expected.
>> >>
>> >> when the target is UNO it produces
>> >>
>> >> 0x4241
>> >>
>> >> Doing this
>> >>
>> >> uint32_t ds =3D 'D';
>> >>  ds =3D (ds << 8)| 'C';
>> >>  ds =3D (ds << 8)| 'B';
>> >>  ds =3D (ds << 8)| 'A';
>> >>
>> >> for either target works ok.
>> >>
>> >> I have tried type casting (not sure that is the right phrase) like
>> >>
>> >> uint32_t ds =3D uint32_t('D'<<24)|uint32_t('C'<<16)
>> >> |uint32_t('B'<<8)|uint32_t('A');
>> >>
>> >> But no joy for the uno target.
>> >>
>> >> The final goal is to construct SPI commands with a esp8266 master
>> with a
>> >> UNO slave.
>> >>
>> >> The following compiles and works fine for the esp8266 target but has
>> the
>> >> issues mentioned above for the UNO target.
>> >>
>> >> #define UNO1_ADDR uint32_t(uint32_t('U')|uint32_t('1'<<8)) //Address
>> UNO1
>> >> #define cmdREADPIN uint32_t(UNO1_ADDR | uint32_t('R'<<16))
>> >> #define cmdWRITEPIN uint32_t((UNO1_ADDR | uint32_t('W'<<16))
>> >> #define cmdREADPIN1 uint32_t(cmdREADPIN | uint32_t('1'<<24))
>> >> #define cmdREADPIN2 uint32_t(cmdREADPIN | uint32_t('2'<<24))
>> >> #define cmdREADPIN3 uint32_t(cmdREADPIN | uint32_t('3'<<24))
>> >>
>> >> Any tips?
>> >>
>> >> Justin
>> >> --
>> >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
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>> >
>> >
>> > --
>> > Jason White
>> > --
>> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
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>>
>> --
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> --
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