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In your code Output code you have not define bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_64); // 4MHz clock with _64 , you not divide the clock. Per default the clock freq. is 250MHz, so you receive with 250MHz clock and you send with 64Mhz... which would explain why it would work when a single program is used and the frequency is the same. ...

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