- fix for #244, byte-order wrong for LSBFIRST buffer transfers

[RudolphRiedel]

See #244, when using buffer transfers with LSBFIRST the byte-order was wrong.

[aentinger]

Hi @RudolphRiedel ☕ 👋

I've verified your changes w/ this test sketch:

#include <SPI.h>

uint8_t TEST_DATA[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};

void setup()
{
  SPI.begin();
  SPI.beginTransaction(SPISettings(1*1000*1000, LSBFIRST, SPI_MODE0));
  SPI.transfer((void *)TEST_DATA, sizeof(TEST_DATA));
}

void loop()
{

}

Before

After

[aentinger]

Tested and verified.

[aentinger]

Thank you for the fix @RudolphRiedel ☕ 👋 🚀