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   源码介绍

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C6747_spi.c

void SPIconfig()

{
Uint32 spidat1;

SPI_SPIGCR0 = 0;   //SPI复位
C6747_wait(0xff);
SPI_SPIGCR0 = 1;   //SPI取消复位

SPI_SPIGCR1 = 0    //设置为Master模式
| (0 << 24)  //enable
| (0 << 16)  //Internal loop-back test mode disabled:自检
| (1 << 1)
| (1 << 0);  //3:Master;0:Slave

SPI_SPIPC0 = 0     //1:SPI功能引脚;0:GPIO功能引脚
| (1 << 11)  //SPI_SOMI
| (1 << 10)  //SPI_SIMO
| (1 << 9)   //SPI_CLK
| (0 << 8)   //SPI_ENA
| (1 << 0);  //SPI_SCS

SPI_SPIPC1 = 0     //SPI引脚的输入输出配置
    | (0 << 11)  //SPI_SOMI pin is an input
    | (1 << 10)  //SPI_SIMO pin is an output
    | (1 << 9)   //SPI_CLK pin is an output
//     | (1 << 8)   //SPI_ENA pin is an output
    | (1 << 0);  //SPI_SCS pin is an output

// spidat1 = 0
//     | (0 << 28)
//     | (0 << 24)
//     | (2 << 16)
//     | (0 << 0);

spidat1 = 0
| (0 << 28)  //CSHOLD:CS始终为低
| (0 << 25)
| (0 << 24)  //FORMAT:0
| (0 << 16)  //CSRN:CS -> LOW
| (0 << 0);  //TXDATA
SPI_SPIDAT1 = spidat1;

SPI_SPIFMT0 = 0
| (0 << 20)  //Most significant bit is shifted out first:高位移出
| (0 << 18)  //delay enable:0;delay disable:1
| (0 << 17)  //POLARITY
| (0 << 16)  //PHASE
| (11 << 8)   //SPIclk -> 12.5MHz
| (8 << 0);  //SPI data word length 8bits

SPI_SPIDEF = 0
| (0 << 0);  //define the state of the SPIx_SCS[n] pins when no transmissions are performed.

SPI_SPIDELAY = 0
| (18 << 24)
| (18 << 16);

SPI_SPIINT = 0
| (1 << 24)  //high-impedance
| (0 << 16)
| (0 << 8)
| (0 << 6)
| (1 << 4);  //enables interrupt on the error

SPI_SPILVL = 0
| (0 << 8)   //Receive interrupt is mapped to interrupt line INT1 it is 1;(reserved)
| (0 << 6)   //Receive overrun interrupt is mapped to interrupt line INT1 it is 1;(reserved)
| (0 << 4);  //Bit error interrupt is mapped to the interrupt the INT1 if it is 1;(reserved)


SPI_SPIGCR1 |= (1 << 24);  //enable
}