Hi world101
To make this modification, I determined the speed of the M5Stack by making a program with:
Serial.println (F_CPU)
which gave 24000000
Then, I modified the file ..\libraries\RF24-master\RF24.cpp by adding these lines (who have // For M5Stack Gray as a remark)
#if !defined(SOFTSPI)
_SPI.setBitOrder(MSBFIRST);
_SPI.setDataMode(SPI_MODE0);
#if !defined(F_CPU) || F_CPU < 20000000
_SPI.setClockDivider(SPI_CLOCK_DIV2);
#elif F_CPU < 40000000
_SPI.setClockDivider(SPI_CLOCK_DIV4);
#elif F_CPU < 80000000
_SPI.setClockDivider(SPI_CLOCK_DIV8);
#elif F_CPU < 160000000
_SPI.setClockDivider(SPI_CLOCK_DIV16);
#elif F_CPU == 240000000 // For M5Stack Grey
_SPI.setClockDivider(SPI_CLOCK_DIV2); // For M5Stack Grey**
#elif F_CPU < 320000000
_SPI.setClockDivider(SPI_CLOCK_DIV32);
#elif F_CPU < 640000000
_SPI.setClockDivider(SPI_CLOCK_DIV64);
#elif F_CPU < 1280000000
_SPI.setClockDivider(SPI_CLOCK_DIV128);
#else
#error "Unsupported CPU frequency. Please set correct SPI divider."
#endif
#endif
Regarding the program where I use the RF24, it is very large, I can, if you want, give you an example of use, with several pipes.
cordially
jpbbricole
