void SpiFrequency(Spi_t *obj, uint32_t hz)
{
uint32_t spiSourceClock;
spiSourceClock = CLOCK_SYS_GetSpiFreq(obj->instance);
/* Disable Spi module */
SPI_HAL_Disable(obj->Spi);
SPI_HAL_SetBaud(obj->Spi, hz, spiSourceClock);
/* Enable Spi module */
SPI_HAL_Enable(obj->Spi);
}
/*FUNCTION**********************************************************************
*
* Function Name : SPI_DRV_MasterConfigureBus
* Description : Configures the SPI port to access a device on the bus.
* The term "device" is used to indicate the SPI device for which the SPI master is communicating.
* The user has two options to configure the device parameters: either pass in the
* pointer to the device configuration structure to the desired transfer function (see
* SPI_DRV_MasterTransferDataBlocking or SPI_DRV_MasterTransferData) or pass it in to the
* SPI_DRV_MasterConfigureBus function. The user can pass in a device structure to the transfer
* function which contains the parameters for the bus (the transfer function will then call
* this function). However, the user has the option to call this function directly especially
* to get the calculated baud rate, at which point they may pass in NULL for the device
* struct in the transfer function (assuming they have called this configure bus function
* first).
*
*END**************************************************************************/
void SPI_DRV_MasterConfigureBus(uint32_t instance,
const spi_master_user_config_t * device,
uint32_t * calculatedBaudRate)
{
assert(device);
/* instantiate local variable of type spi_master_state_t and point to global state */
spi_master_state_t * spiState = (spi_master_state_t *)g_spiStatePtr[instance];
SPI_Type *base = g_spiBase[instance];
/* Configure the bus to access the provided device.*/
*calculatedBaudRate = SPI_HAL_SetBaud(base, device->bitsPerSec, spiState->spiSourceClock);
SPI_HAL_SetDataFormat(base, device->polarity, device->phase, device->direction);
#if FSL_FEATURE_SPI_16BIT_TRANSFERS
SPI_HAL_Set8or16BitMode(base, device->bitCount);
#endif
}
/**
* @brief 初始化SPI模块
* @param SPI_InitStruct :spi初始化配置结构体
* @retval None
*/
void SPI_Init(SPI_InitTypeDef* SPI_InitStruct)
{
uint32_t clock;
/* enable clock gate */
*(uint32_t*)SIM_SPIClockGateTable[SPI_InitStruct->instance].addr |= SIM_SPIClockGateTable[SPI_InitStruct->instance].mask;
/* stop SPI */
SPI_InstanceTable[SPI_InitStruct->instance]->C1 &= ~SPI_C1_SPE_MASK;
/* master or slave */
switch(SPI_InitStruct->mode)
{
case kSPI_Master:
SPI_InstanceTable[SPI_InitStruct->instance]->C1 |= SPI_C1_MSTR_MASK;
break;
case kSPI_Slave:
SPI_InstanceTable[SPI_InitStruct->instance]->C1 &= ~SPI_C1_MSTR_MASK;
break;
default:
break;
}
/* bit order */
switch(SPI_InitStruct->bitOrder)
{
case kSPI_MSBFirst:
SPI_InstanceTable[SPI_InitStruct->instance]->C1 &= ~SPI_C1_LSBFE_MASK;
break;
case kSPI_LSBFirst:
SPI_InstanceTable[SPI_InitStruct->instance]->C1 |= SPI_C1_LSBFE_MASK;
break;
default:
break;
}
/* clock parity */
switch(SPI_InitStruct->frameFormat)
{
case kSPI_CPOL0_CPHA0:
SPI_InstanceTable[SPI_InitStruct->instance]->C1 &= ~SPI_C1_CPHA_MASK;
SPI_InstanceTable[SPI_InitStruct->instance]->C1 &= ~SPI_C1_CPOL_MASK;
break;
case kSPI_CPOL0_CPHA1:
SPI_InstanceTable[SPI_InitStruct->instance]->C1 |= SPI_C1_CPHA_MASK;
SPI_InstanceTable[SPI_InitStruct->instance]->C1 &= ~SPI_C1_CPOL_MASK;
break;
case kSPI_CPOL1_CPHA0:
SPI_InstanceTable[SPI_InitStruct->instance]->C1 &= ~SPI_C1_CPHA_MASK;
SPI_InstanceTable[SPI_InitStruct->instance]->C1 |= SPI_C1_CPOL_MASK;
break;
case kSPI_CPOL1_CPHA1:
SPI_InstanceTable[SPI_InitStruct->instance]->C1 |= SPI_C1_CPHA_MASK;
SPI_InstanceTable[SPI_InitStruct->instance]->C1 |= SPI_C1_CPOL_MASK;
break;
default:
break;
}
/* config SS as PCS0 output */
SPI_InstanceTable[SPI_InitStruct->instance]->C2 |= SPI_C2_MODFEN_MASK;
SPI_InstanceTable[SPI_InitStruct->instance]->C1 |= SPI_C1_SSOE_MASK;
/* baudrate */
if(SPI_InitStruct->instance == HW_SPI0)
{
CLOCK_GetClockFrequency(kBusClock, &clock);
}
else
{
CLOCK_GetClockFrequency(kSystemClock, &clock);
}
SPI_HAL_SetBaud(SPI_InitStruct->instance, SPI_InitStruct->baudrate, clock);
/* enable SPI */
SPI_InstanceTable[SPI_InitStruct->instance]->C1 |= SPI_C1_SPE_MASK;
}
