52 lines
984 B
C
52 lines
984 B
C
#include <stdint.h>
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#include "../include/spi.h"
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void spi_init()
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{
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SPI_REG(SPI_CTRL) = 0x06; // CPOL = 1, CPHA = 1
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}
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void spi_set_ss(uint8_t level)
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{
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if (!level)
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SPI_REG(SPI_CTRL) |= 1 << 3;
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else
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SPI_REG(SPI_CTRL) &= ~(1 << 3);
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}
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void spi_write_byte(uint8_t data)
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{
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SPI_REG(SPI_DATA) = data;
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SPI_REG(SPI_CTRL) |= 1 << 0; // start
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while (SPI_REG(SPI_STATUS) & 0x1); // wait transfer complete
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}
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void spi_write_bytes(uint8_t data[], uint32_t len)
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{
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uint32_t i;
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for (i = 0; i < len; i++)
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spi_write_byte(data[i]);
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}
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uint8_t spi_read_byte()
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{
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uint8_t data;
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SPI_REG(SPI_CTRL) |= 1 << 0; // start
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while (SPI_REG(SPI_STATUS) & 0x1); // wait transfer complete
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data = SPI_REG(SPI_DATA) & 0xff; // readback data
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return data;
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}
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void spi_read_bytes(uint8_t data[], uint32_t len)
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{
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uint32_t i;
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for (i = 0; i < len; i++)
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data[i] = spi_read_byte();
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}
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