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#define SPI_BAUDRATE 1000000
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#define SPI_MASTER 1
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#define SPI_READBUF_LEN 32
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#define SPI_SS_PORT D
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#define SPI_SS_PIN 7
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// copied/adapted from usbdrv.h
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#define SPI_CONCAT(a, b) a ## b
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#define SPI_OUTPORT(name) SPI_CONCAT(PORT, name)
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#define SPI_INPORT(name) SPI_CONCAT(PIN, name)
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#define SPI_DDRPORT(name) SPI_CONCAT(DDR, name)
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#define SPI_SSOUT SPI_OUTPORT(SPI_SS_PORT)
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#define SPI_SSIN SPI_INPORT(SPI_SS_PORT)
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#define SPI_SSDDR SPI_DDRPORT(SPI_SS_PORT)
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uint8_t spi_write(uint8_t *data, uint8_t len);
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void spi_init();
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