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21 lines
438 B
21 lines
438 B
#include <xinu.h> |
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int32 spiputc (struct dentry *devptr, char c) |
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{ |
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struct spi_csreg *spiptr; /* SPI control and status regs */ |
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/* Configure SPI peripheral */ |
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if(devptr->dvminor == 0) { |
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spiptr = (struct spi_csreg *)SPI1_BASE; |
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} |
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else { |
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kprintf("SPI device not recognized\n"); |
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return SYSERR; |
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} |
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/* Check if buffer is empty -- busy wait TODO: interrupts */ |
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while (spiptr->sr & ~(1 << SPI_TXE)); |
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spiptr->dr = c; |
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return OK; |
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}
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