/*******************************************************************************
* Function Name : ADS7843_SPI_Init
* Description : ADS7843 SPI 初始化
* Input : None
* Output : None
* Return : None
* Attention : None
*******************************************************************************/
static void ADS7843_SPI_Init(void)
{
volatile uint32_t dummy;
/* Initialize and enable the SSP1 Interface module. */
LPC_SC->PCONP |= (1 << 10); /* Enable power to SSPI1 block */
/* P0.7 SCK, P0.8 MISO, P0.9 MOSI are SSP pins. */
LPC_PINCON->PINSEL0 &= ~((3UL<<14) | (3UL<<16) | (3UL<<18)) ; /* P0.7,P0.8,P0.9 cleared */
LPC_PINCON->PINSEL0 |= (2UL<<14) | (2UL<<16) | (2UL<<18); /* P0.7 SCK1,P0.8 MISO1,P0.9 MOSI1 */
/* PCLK_SSP1=CCLK */
LPC_SC->PCLKSEL0 &= ~(3<<20); /* PCLKSP0 = CCLK/4 (18MHz) */
LPC_SC->PCLKSEL0 |= (1<<20); /* PCLKSP0 = CCLK (72MHz) */
LPC_SSP1->CR0 = 0x0007; /* 8Bit, CPOL=0, CPHA=0 */
LPC_SSP1->CR1 = 0x0002; /* SSP1 enable, master */
LPC17xx_SPI_SetSpeed ( SPI_SPEED_500kHz );
/* wait for busy gone */
while( LPC_SSP1->SR & ( 1 << SSPSR_BSY ) );
/* drain SPI RX FIFO */
while( LPC_SSP1->SR & ( 1 << SSPSR_RNE ) )
{
dummy = LPC_SSP1->DR;
}
}
/* Initialize the SSP0, SSP0_PCLK=CCLK=72MHz */
void LPC17xx_SPI_Init (void)
{
uint32_t dummy;
dummy = dummy; // avoid warning
/* Initialize and enable the SSP0 Interface module. */
LPC_SC->PCONP |= (1 << 21); /* Enable power to SSPI0 block */
/* SSEL is GPIO, output set to high. */
LPC_GPIO0->FIODIR |= (1<<16); /* P0.16 is output */
LPC_PINCON->PINSEL1 &= ~(3<<0); /* P0.16 SSEL (used as GPIO) */
LPC17xx_SPI_DeSelect (); /* set P0.16 high (SSEL inactiv) */
/* SCK, MISO, MOSI are SSP pins. */
LPC_PINCON->PINSEL0 &= ~(3UL<<30); /* P0.15 cleared */
LPC_PINCON->PINSEL0 |= (2UL<<30); /* P0.15 SCK0 */
LPC_PINCON->PINSEL1 &= ~((3<<2) | (3<<4)); /* P0.17, P0.18 cleared */
LPC_PINCON->PINSEL1 |= ((2<<2) | (2<<4)); /* P0.17 MISO0, P0.18 MOSI0 */
/* PCLK_SSP0=CCLK */
LPC_SC->PCLKSEL1 &= ~(3<<10); /* PCLKSP0 = CCLK/4 (18MHz) */
LPC_SC->PCLKSEL1 |= (1<<10); /* PCLKSP0 = CCLK (72MHz) */
LPC_SSP0->CR0 = 0x0007; /* 8Bit, CPOL=0, CPHA=0 */
LPC_SSP0->CR1 = 0x0002; /* SSP0 enable, master */
LPC17xx_SPI_SetSpeed (SPI_SPEED_400kHz);
/* wait for busy gone */
while( LPC_SSP0->SR & ( 1 << SSPSR_BSY ) );
/* drain SPI RX FIFO */
while( LPC_SSP0->SR & ( 1 << SSPSR_RNE ) )
{
dummy = LPC_SSP0->DR;
}
}
