Use of 2 different SPI hardware ports i parallel stm32f4 -Arduino

Libraries
1

Hello, i am new here.

i want to use 2 different spi ports in parallel connected to different hardware. Single SPI is fine:
SPI.begin();
SPI.setClockDivider(SPI_CLOCK_DIV4);
SPI.setDataMode(SPI_MODE0);
SPI.setBitOrder(MSBFIRST);

I have only found 1 advice to use the second SPI port:

SPIClass SPIII(PB15, PB14, PB13);
SPIII.begin();
SPIII.setClockDivider(SPI_CLOCK_DIV4);
SPIII.setDataMode(SPI_MODE0);
SPIII.setBitOrder(MSBFIRST);

Trying to use the SPI ports:

sendbuffer[10] = SPI.transfer(0); is fine , works.

sendbuffer[4] = SPIII.transfer(0); does not work. The error message is:

src\main.cpp:264:19: error: ‘SPIII’ was not declared in this scope; did you mean ‘SPI’?

I have no idea what’s wrong.
It would be nice to get some help.

Thanks in advance.
Ulrich

2

What’s the full code? The SPIII variable must either be global or be declared in the same function (though, you probably want it global). Seems like a pure C++ issue to me.

3

Dear maxgerhardt,
thank you. Your suggestion helped me a lot to find the error between my ears.

it was

void setup() {

SPIClass SPIII(PB15, PB14, PB13);

  SPIII.begin();
  SPIII.setClockDivider(SPI_CLOCK_DIV4);
  SPIII.setDataMode(SPI_MODE0);
  SPIII.setBitOrder(MSBFIRST);
 }

but it should be:

SPIClass SPIII(PB15, PB14, PB13);

void setup() {

  SPIII.begin();
  SPIII.setClockDivider(SPI_CLOCK_DIV4);
  SPIII.setDataMode(SPI_MODE0);
  SPIII.setBitOrder(MSBFIRST);
 }

The examples have not been clear enough for me to understand the usage of the example.

It seems to work. Now i will check it with hardware.
Thanks a lot,
Ulrich

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