35973473d3
the SPI module reads and writes at the same time. If you don't want to write a value, then write all zeros or whatever the device you are communicating with wants.
26 lines
523 B
C
26 lines
523 B
C
#include <stdio.h>
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#include <stdint.h>
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#include <spi.h>
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char retval;
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int main(void)
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{
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printf("Setting SPI location to 0x02\n");
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*(uint8_t*)0x7ff0 = 2;
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if (!(*(uint8_t*)0x7ff0 == 2)) {
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printf("Expected 0x02 at 0x7ff0\n");
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return 1;
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}
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printf("Done!\n\n");
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printf("Starting spi_byte test...\n");
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retval = spi_byte(0xa5);
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if (retval != 0) {
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printf("Expected 0 return value from spi_byte\n");
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return 1;
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}
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printf("Done! %x\n", retval);
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return 0;
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} |