Hello all,
I am using two SPIs for my project. I figured out that the first SPI instance (SPI) corresponds to LPSPI4 and the second (SPI1) corresponds to LPSPI3.
While LPSPI4 works fine (checked on the scope), I am not seeing LPSPI3 MOSI and SCK signals. Here is my code to initialize those:
// LPSPI4
SPI.begin();
SPI.beginTransaction(SPISettings(50000000, MSBFIRST, SPI_MODE0));
// LPSPI3
SPI1.begin();
SPI1.beginTransaction(SPISettings(50000000, MSBFIRST, SPI_MODE0));
Pins used for LPSPI4:
SCK = 13
SOUT(MOSI)= 11
Pins used for LPSPI3:
SCK = 27
SOUT (MOSI) = 26
I tried the SPI1.setSCK() and SPI1.setMOSI() calls, but this changes nothing.
If I manually configure the processor pads like the following, I can see SCK on the scope:
CORE_PIN27_CONFIG = MODE_ALT2; // SCK
I am unable to see the MOSI signal, even if I configure the pad:
CORE_PIN26_CONFIG = MODE_ALT2; // MOSI
So my questions are:
What am I doing wrong?
Why do I have to configure a pad to see the SCK signal? Normally the SPI1 class use it as default.
Why can't I see the MOSI signall?
I am quite lost. Maybe I am doing a stupid mistake.
I am using two SPIs for my project. I figured out that the first SPI instance (SPI) corresponds to LPSPI4 and the second (SPI1) corresponds to LPSPI3.
While LPSPI4 works fine (checked on the scope), I am not seeing LPSPI3 MOSI and SCK signals. Here is my code to initialize those:
// LPSPI4
SPI.begin();
SPI.beginTransaction(SPISettings(50000000, MSBFIRST, SPI_MODE0));
// LPSPI3
SPI1.begin();
SPI1.beginTransaction(SPISettings(50000000, MSBFIRST, SPI_MODE0));
Pins used for LPSPI4:
SCK = 13
SOUT(MOSI)= 11
Pins used for LPSPI3:
SCK = 27
SOUT (MOSI) = 26
I tried the SPI1.setSCK() and SPI1.setMOSI() calls, but this changes nothing.
If I manually configure the processor pads like the following, I can see SCK on the scope:
CORE_PIN27_CONFIG = MODE_ALT2; // SCK
I am unable to see the MOSI signal, even if I configure the pad:
CORE_PIN26_CONFIG = MODE_ALT2; // MOSI
So my questions are:
What am I doing wrong?
Why do I have to configure a pad to see the SCK signal? Normally the SPI1 class use it as default.
Why can't I see the MOSI signall?
I am quite lost. Maybe I am doing a stupid mistake.
Last edited: