#include "support.h"
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#include "support.h"
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#include "board.h"
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#include "board.h"
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#include "spi.h"
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#include "spi.h"
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#define SPI_XMIT() \
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#define SPI_XMIT() \
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REG32(SPI_BASE + SPI_CTRL) |= SPI_CTRL_GO; \
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REG32(SPI_BASE + SPI_CTRL) |= SPI_CTRL_GO; \
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while(REG32(SPI_BASE + SPI_CTRL) & SPI_CTRL_BSY)
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while(REG32(SPI_BASE + SPI_CTRL) & SPI_CTRL_BSY)
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void spi_init (int slave, int fq, int bit_nb, int lsb, int tx_pol, int rx_pol)
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void spi_init (int slave, int fq, int bit_nb, int lsb, int tx_pol, int rx_pol)
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{
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{
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int ctrl = 0;
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int ctrl = 0;
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/* Set devider register to obtain desired serial clock frequency */
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/* Set devider register to obtain desired serial clock frequency */
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REG32(SPI_BASE + SPI_DEVIDER) = IN_CLK/(fq*2) - 1;
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REG32(SPI_BASE + SPI_DEVIDER) = IN_CLK/(fq*2) - 1;
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/* Set control register */
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/* Set control register */
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ctrl = bit_nb << 3;
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ctrl = bit_nb << 3;
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ctrl |= lsb ? SPI_CTRL_LSB : 0;
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ctrl |= lsb ? SPI_CTRL_LSB : 0;
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ctrl |= tx_pol ? SPI_CTRL_TX_NEGEDGE : 0;
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ctrl |= tx_pol ? SPI_CTRL_TX_NEGEDGE : 0;
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ctrl |= rx_pol ? SPI_CTRL_RX_NEGEDGE : 0;
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ctrl |= rx_pol ? SPI_CTRL_RX_NEGEDGE : 0;
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REG32(SPI_BASE + SPI_CTRL) = ctrl;
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REG32(SPI_BASE + SPI_CTRL) = ctrl;
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/* Activate desired slave device */
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/* Activate desired slave device */
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REG32(SPI_BASE + SPI_SS) = 1 << slave;
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REG32(SPI_BASE + SPI_SS) = 1 << slave;
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}
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}
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unsigned long spi_xmit (unsigned long val)
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unsigned long spi_xmit (unsigned long val)
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{
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{
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REG32(SPI_BASE + SPI_TX) = val;
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REG32(SPI_BASE + SPI_TX) = val;
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SPI_XMIT();
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SPI_XMIT();
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return REG32(SPI_BASE + SPI_RX);
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return REG32(SPI_BASE + SPI_RX);
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}
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}
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