/* Setup SPI handle and parameters */
static void setupSpiMaster()
{
SPI_CFG_T spiCfg;
SPI_DELAY_CONFIG_T spiDelayCfg;
/* Initialize SPI Block */
Chip_SPI_Init(LPC_SPI0);
/* Set SPI Config register */
spiCfg.ClkDiv = 0xFFFF; /* Set Clock divider to maximum */
spiCfg.Mode = SPI_MODE_MASTER; /* Enable Master Mode */
spiCfg.ClockMode = SPI_CLOCK_MODE0; /* Enable Mode 0 */
spiCfg.DataOrder = SPI_DATA_MSB_FIRST; /* Transmit MSB first */
/* Slave select polarity is active low */
spiCfg.SSELPol = (SPI_CFG_SPOL0_LO | SPI_CFG_SPOL1_LO | SPI_CFG_SPOL2_LO | SPI_CFG_SPOL3_LO);
Chip_SPI_SetConfig(LPC_SPI0, &spiCfg);
/* Set Delay register */
spiDelayCfg.PreDelay = 2;
spiDelayCfg.PostDelay = 2;
spiDelayCfg.FrameDelay = 2;
spiDelayCfg.TransferDelay = 2;
Chip_SPI_DelayConfig(LPC_SPI0, &spiDelayCfg);
/* Enable Loopback mode for this example */
Chip_SPI_EnableLoopBack(LPC_SPI0);
/* Enable SPI0 */
Chip_SPI_Enable(LPC_SPI0);
}
uint32_t SPI_ReadCh0(void){
/* Disable clocks to SWM and IOCON to save power */
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SWM);
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
// initialize pins
Chip_SWM_DisableFixedPin(SWM_FIXED_XTALIN);
Chip_SWM_MovablePinAssign(SWM_SPI1_SCK_IO, 8);
Chip_SWM_MovablePinAssign(SWM_SPI1_MOSI_IO, 17);
Chip_SWM_MovablePinAssign(SWM_SPI1_MISO_IO, 16);
//TODO: do we need to set slave select if it's tied to ground?
Chip_SWM_MovablePinAssign(SWM_SPI1_SSEL_IO, 4);
ConfigStruct.Mode = SPI_MODE_MASTER;
ConfigStruct.ClkDiv = Chip_SPI_CalClkRateDivider(LPC_SPI1, 100000);
ConfigStruct.ClockMode = SPI_CLOCK_CPHA0_CPOL0;
ConfigStruct.DataOrder = SPI_DATA_MSB_FIRST; //enable MSB first option
ConfigStruct.SSELPol = SPI_CFG_SPOL_LO;
Chip_SPI_Init(LPC_SPI1, &ConfigStruct);
DelayConfigStruct.FrameDelay = 0;
DelayConfigStruct.PostDelay = 0;
DelayConfigStruct.PreDelay = 0;
DelayConfigStruct.TransferDelay = 0;
Chip_SPI_DelayConfig(LPC_SPI1, &DelayConfigStruct);
Chip_SPI_Enable(LPC_SPI1);
//Chip_SPI_EnableLoopBack(LPC_SPI1);
// init transmit buffer
TxBuf[0] = 0x68;
TxBuf[1] = 0x00;
XfSetup.Length = BUFFER_SIZE;
XfSetup.pTx = TxBuf;
XfSetup.RxCnt = XfSetup.TxCnt = 0;
XfSetup.DataSize = 8;
XfSetup.pRx = RxBuf;
Chip_SPI_RWFrames_Blocking(LPC_SPI1, &XfSetup);
uint16_t value = ((RxBuf[0] & 0x03) << 8) + (RxBuf[1] & 0xFF);
//Chip_SPI_DisableLoopBack(LPC_SPI1);
/* DeInitialize SPI peripheral */
Chip_SPI_DeInit(LPC_SPI1);
/* Disable clocks to SWM and IOCON to save power */
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_SWM);
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_IOCON);
return value;
}
