示例#1
0
文件: spi.c 项目: dihmuzikien/ECE473
uchar SPI_Transmit_sw(uchar send_byte)
{
    uchar rec_byte = 0;
    uchar i;
    for (i = 0; i < 8; i++)
    {
        // Transmit MSB first
        if ((send_byte & 0x80) != 0)
        {
            SET_MOSI(); // Set MOSI high
        }
        else
        {
            CLR_MOSI(); // Set MOSI low
        }

        // Shift 2nd msb to msb
        send_byte = send_byte << 1;

        // Get data from MISO pin
        rec_byte = rec_byte << 1;
        if (GET_MISO())
        {
            rec_byte++;
        }

        // Pulse clock
        SET_SCK();
        ten_us_delay(sw_delay_time);
        CLR_SCK();
        ten_us_delay(sw_delay_time);
    }

    return rec_byte;
}
示例#2
0
文件: tlc5916.c 项目: smeyel/M2
//egy bitet kiküld a ledmeghajtó SDI lábára
//b=0: low
//b!=0: high
static void send_one_bit(int b){
	
	if(b)	SET_SDI();
	else	CLR_SDI();
	
	SET_SCK();
	CLR_SCK();

}