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https://opencores.org/ocsvn/openrisc/openrisc/trunk
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[/] [openrisc/] [trunk/] [bootloaders/] [orpmon/] [drivers/] [spi.c] - Rev 439
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#include "support.h" #include "board.h" #include "spi.h" #define SPI_XMIT() \ REG32(SPI_BASE + SPI_CTRL) |= SPI_CTRL_GO; \ while(REG32(SPI_BASE + SPI_CTRL) & SPI_CTRL_BSY) void spi_init (int slave, int fq, int bit_nb, int lsb, int tx_pol, int rx_pol) { int ctrl = 0; /* Set devider register to obtain desired serial clock frequency */ REG32(SPI_BASE + SPI_DEVIDER) = IN_CLK/(fq*2) - 1; /* Set control register */ ctrl = bit_nb << 3; ctrl |= lsb ? SPI_CTRL_LSB : 0; ctrl |= tx_pol ? SPI_CTRL_TX_NEGEDGE : 0; ctrl |= rx_pol ? SPI_CTRL_RX_NEGEDGE : 0; REG32(SPI_BASE + SPI_CTRL) = ctrl; /* Activate desired slave device */ REG32(SPI_BASE + SPI_SS) = 1 << slave; } unsigned long spi_xmit (unsigned long val) { REG32(SPI_BASE + SPI_TX) = val; SPI_XMIT(); return REG32(SPI_BASE + SPI_RX); }
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