用LPC1768的IO口模拟SPI时序，将程序贴上，
#define CH376_SPI_SCK_init() gpio_init(LPC_GPIO0,15,1,1)
#define CH376_SPI_SCK_high() gpio_output_value(LPC_GPIO0,15,1)
#define CH376_SPI_SCK_low() gpio_output_value(LPC_GPIO0,15,0)
#define CH376_SPI_SCS_init() gpio_init(LPC_GPIO0,16,1,1)
#define CH376_SPI_SCS_high() gpio_output_value(LPC_GPIO0,16,1)
#define CH376_SPI_SCS_low() gpio_output_value(LPC_GPIO0,16,0)
#define CH376_SPI_MISO_init() gpio_init(LPC_GPIO0,17,0,1)
#define CH376_SPI_MISO() gpio_read_value(LPC_GPIO0,17)
#define CH376_SPI_MOSI_init() gpio_init(LPC_GPIO0,18,1,1)
#define CH376_SPI_MOSI_high() gpio_output_value(LPC_GPIO0,18,1)
#define CH376_SPI_MOSI_low() gpio_output_value(LPC_GPIO0,18,0)
#define CH376_SPI_RST_init() gpio_init(LPC_GPIO0,19,1,1)
#define CH376_SPI_RST_high() gpio_output_value(LPC_GPIO0,19,1)
#define CH376_SPI_RST_low() gpio_output_value(LPC_GPIO0,19,0)
#define CH376_SPI_INT_init() gpio_init(LPC_GPIO0,20,0,1)
#define CH376_SPI_INT_state() gpio_read_value(LPC_GPIO0,20)
void mDelaymS(uint16_t cnt)
{
uint16_t i,j;
for(i=0;i
{
for(j=0;j<5000;j++);
}
}
void delay_us(uint16_t cnt)
{
uint16_t i,j;
for(i=0;i
{
for(j=0;j<10;j++);
}
}
voidCH376_PORT_INIT( void )
{
CH376_SPI_SCS_high();
CH376_SPI_SCK_high();
}
voidxEndCH376Cmd( void )
{
CH376_SPI_SCS_high();
}
voidSpi376OutByte(uint8_t d )
{
//ssp_write_read_byte(LPC_SSP0,d);
uint8_t i;
for(i=0;i<8;i++)
{
CH376_SPI_SCK_low();
if(d&0x80)
{
CH376_SPI_MOSI_high();
}
else
{
CH376_SPI_MOSI_low();
}
d<<=1;
CH376_SPI_SCK_high();
}
}
uint8_t Spi376InByte(void)
{
uint8_t i,d=0;
for(i=0;i<8;i++)
{
CH376_SPI_SCK_low();
d<<=1;
if(CH376_SPI_MISO())
{
d++;
}
CH376_SPI_SCK_high();
}
return d;
}
/*******************************************************************************
向CH376写命令
*******************************************************************************/
voidxWriteCH376Cmd( uint8_t mCmd )
{
CH376_SPI_SCS_high();
delay_us(3);
CH376_SPI_SCS_low();
mDelaymS( 10 );
Spi376OutByte( mCmd );
delay_us(2);
}
/*******************************************************************************
向CH376写数据
*******************************************************************************/
voidxWriteCH376Data( uint8_t mData )
{
Spi376OutByte( mData );
delay_us(10);
}
/*******************************************************************************
CH376读数据
*******************************************************************************/
uint8_txReadCH376Data( void )
{
uint8_t i=0;
delay_us( 10 );
i=Spi376InByte();
return (i);
}
/*******************************************************************************
查询INT中断
*******************************************************************************/
uint8_tQuery376Interrupt( void )
{
uint8_t i;
i = (CH376_SPI_INT_state() ? 0 : 1 );
return( i );
}
/*******************************************************************************
初始化CH376
*******************************************************************************/
uint8_tmInitCH376Host( void )
{
uint8_tres;
mDelaymS(100);
/*CH376_SPI_RST_high();
mDelaymS(100);
CH376_SPI_RST_low();
mDelaymS(100);*/
CH376_PORT_INIT( );
xWriteCH376Cmd( CMD11_CHECK_EXIST );
xWriteCH376Data( 0x55 );
res = xReadCH376Data( );
//printf("res =%02x \n",(unsigned short)res);
xEndCH376Cmd( );
if ( res != 0xAA ) return( ERR_USB_UNKNOWN );
xWriteCH376Cmd( CMD11_SET_USB_MODE );
xWriteCH376Data( 0x06 );
delay_us( 20 );
res = xReadCH376Data( );
//printf("res =%02x \n",(unsigned short)res);
xEndCH376Cmd( );
if ( res == CMD_RET_SUCCESS )
{
return( USB_INT_SUCCESS );
}
else
{
return( ERR_USB_UNKNOWN );
}
}
初始化返回值一直是0xff,不知道怎么回事，泪崩！！！
