| NANO100_BSP V3.05.000 The Board Support Package for Nano100BN Series

Macros | Functions
SPI Exported Functions
NANO100 Device Driver » SPI Driver » SPI Exported Constants
Collaboration diagram for SPI Exported Functions:

## Macros
#define | SPI_ABORT_3WIRE_TRANSFER(spi)
| Abort the current transfer in slave 3-wire mode. More...
#define | SPI_CLR_3WIRE_START_INT_FLAG(spi)
| Clear the slave 3-wire mode start interrupt flag. More...
#define | SPI_CLR_UNIT_TRANS_INT_FLAG(spi)
| Clear the unit transfer interrupt flag. More...
#define | SPI_DISABLE_3WIRE_MODE(spi)
| Disable slave 3-wire mode. More...
#define | SPI_ENABLE_3WIRE_MODE(spi)
| Enable slave 3-wire mode. More...
#define | SPI_GET_RX_FIFO_COUNT(spi)
| Get the count of available data in RX FIFO. More...
#define | SPI_GET_RX_FIFO_EMPTY_FLAG(spi)
| Get the Rx FIFO empty flag. More...
#define | SPI_GET_TX_FIFO_EMPTY_FLAG(spi)
| Get the Tx FIFO empty flag. More...
#define | SPI_GET_TX_FIFO_FULL_FLAG(spi)
| Get the Tx FIFO full flag. More...
#define | SPI_READ_RX0(spi)
| Get the datum read from RX0 FIFO. More...
#define | SPI_READ_RX1(spi) ( (spi)->RX1 )
| Get the datum read from RX1 FIFO. More...
#define | SPI_WRITE_TX0(spi, u32TxData)
| Write datum to TX0 register. More...
#define | SPI_WRITE_TX1(spi, u32TxData)
| Write datum to TX1 register. More...
#define | SPI_SET_SS0_HIGH(spi)
| Set SPIn_SS0 pin to high state. More...
#define | SPI_SET_SS0_LOW(spi)
| Set SPIn_SS0 pin to low state. More...
#define | SPI_SET_SS1_HIGH(spi)
| Set SPIn_SS1 pin to high state. More...
#define | SPI_SET_SS1_LOW(spi)
| Set SPIn_SS1 pin to low state. More...
#define | SPI_SET_SS_LEVEL(spi, ss0, ss1) ((spi)->SSR = ((spi)->SSR & ~(SPI_SSR_AUTOSS_Msk|SPI_SSR_SS_LVL_Msk|SPI_SSR_SSR_Msk)) | (((ss1)^1) << 1) | ((ss0)^1))
| Set SPIn_SS0, SPIn_SS1 pin to high or low state. More...
#define | SPI_ENABLE_BYTE_REORDER(spi)
| Enable byte reorder function. More...
#define | SPI_DISABLE_BYTE_REORDER(spi)
| Disable byte reorder function. More...
#define | SPI_SET_SUSPEND_CYCLE(spi, u32SuspCycle)
| Set the length of suspend interval. More...
#define | SPI_SET_LSB_FIRST(spi)
| Set the SPI transfer sequence with LSB first. More...
#define | SPI_SET_MSB_FIRST(spi)
| Set the SPI transfer sequence with MSB first. More...
#define | SPI_IS_BUSY(spi)
| Get the SPI busy state. More...
#define | SPI_TRIGGER(spi)
| Set the GO_BUSY bit to trigger SPI transfer. More...
#define | SPI_DISABLE_DUAL_MODE(spi)
| Disable SPI Dual IO function. More...
#define | SPI_ENABLE_DUAL_INPUT_MODE(spi)
| Enable Dual IO function and set SPI Dual IO direction to input. More...
#define | SPI_ENABLE_DUAL_OUTPUT_MODE(spi)
| Enable Dual IO function and set SPI Dual IO direction to output. More...
#define | SPI_TRIGGER_RX_PDMA(spi)
| Trigger RX PDMA transfer. More...
#define | SPI_TRIGGER_TX_PDMA(spi)
| Trigger TX PDMA transfer. More...
#define | SPI_ENABLE_2BIT_MODE(spi)
| Enable 2-bit transfer mode. More...
#define | SPI_DISABLE_2BIT_MODE(spi)
| Disable 2-bit transfer mode. More...
#define | SPI_GET_STATUS(spi)
| Get the status register value. More...

## Functions
static __INLINE void | SPI_SET_DATA_WIDTH (SPI_T *spi, uint32_t u32Width)
| Set the data width of a SPI transaction. More...
uint32_t | SPI_Open (SPI_T *spi, uint32_t u32MasterSlave, uint32_t u32SPIMode, uint32_t u32DataWidth, uint32_t u32BusClock)
| This function make SPI module be ready to transfer. By default, the SPI transfer sequence is MSB first and the automatic slave select function is disabled. In Slave mode, the u32BusClock must be NULL and the SPI clock divider setting will be 0. More...
void | SPI_Close (SPI_T *spi)
| Reset SPI module and disable SPI peripheral clock. More...
void | SPI_ClearRxFIFO (SPI_T *spi)
| Clear Rx FIFO buffer. More...
void | SPI_ClearTxFIFO (SPI_T *spi)
| Clear Tx FIFO buffer. More...
void | SPI_DisableAutoSS (SPI_T *spi)
| Disable the automatic slave select function. More...
void | SPI_EnableAutoSS (SPI_T *spi, uint32_t u32SSPinMask, uint32_t u32ActiveLevel)
| Enable the automatic slave select function. Only available in Master mode. More...
uint32_t | SPI_SetBusClock (SPI_T *spi, uint32_t u32BusClock)
| Set the SPI bus clock. Only available in Master mode. More...
void | SPI_EnableFIFO (SPI_T *spi, uint32_t u32TxThreshold, uint32_t u32RxThreshold)
| Enable FIFO mode with user-specified Tx FIFO threshold and Rx FIFO threshold configurations. More...
void | SPI_DisableFIFO (SPI_T *spi)
| Disable FIFO mode. More...
uint32_t | SPI_GetBusClock (SPI_T *spi)
| Get the actual frequency of SPI bus clock. Only available in Master mode. More...
void | SPI_EnableInt (SPI_T *spi, uint32_t u32Mask)
| Enable FIFO related interrupts specified by u32Mask parameter. More...
void | SPI_DisableInt (SPI_T *spi, uint32_t u32Mask)
| Disable FIFO related interrupts specified by u32Mask parameter. More...
void | SPI_EnableWakeup (SPI_T *spi)
| Enable wake-up function. More...
void | SPI_DisableWakeup (SPI_T *spi)
| Disable wake-up function. More...

## Detailed Description

## Macro Definition Documentation

## ◆ SPI_ABORT_3WIRE_TRANSFER

#define SPI_ABORT_3WIRE_TRANSFER | ( |  | spi | ) |

Abort the current transfer in slave 3-wire mode.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 71 of file spi.h.

## ◆ SPI_CLR_3WIRE_START_INT_FLAG

#define SPI_CLR_3WIRE_START_INT_FLAG | ( |  | spi | ) |

Clear the slave 3-wire mode start interrupt flag.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 79 of file spi.h.

## ◆ SPI_CLR_UNIT_TRANS_INT_FLAG

#define SPI_CLR_UNIT_TRANS_INT_FLAG | ( |  | spi | ) |

Clear the unit transfer interrupt flag.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 87 of file spi.h.

## ◆ SPI_DISABLE_2BIT_MODE

#define SPI_DISABLE_2BIT_MODE | ( |  | spi | ) |

Disable 2-bit transfer mode.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 351 of file spi.h.

## ◆ SPI_DISABLE_3WIRE_MODE

#define SPI_DISABLE_3WIRE_MODE | ( |  | spi | ) |

Disable slave 3-wire mode.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 95 of file spi.h.

## ◆ SPI_DISABLE_BYTE_REORDER

#define SPI_DISABLE_BYTE_REORDER | ( |  | spi | ) |

Disable byte reorder function.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 237 of file spi.h.

## ◆ SPI_DISABLE_DUAL_MODE

#define SPI_DISABLE_DUAL_MODE | ( |  | spi | ) |

Disable SPI Dual IO function.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 303 of file spi.h.

## ◆ SPI_ENABLE_2BIT_MODE

#define SPI_ENABLE_2BIT_MODE | ( |  | spi | ) |

Enable 2-bit transfer mode.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 343 of file spi.h.

## ◆ SPI_ENABLE_3WIRE_MODE

#define SPI_ENABLE_3WIRE_MODE | ( |  | spi | ) |

Enable slave 3-wire mode.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 103 of file spi.h.

## ◆ SPI_ENABLE_BYTE_REORDER

#define SPI_ENABLE_BYTE_REORDER | ( |  | spi | ) |

Enable byte reorder function.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 229 of file spi.h.

## ◆ SPI_ENABLE_DUAL_INPUT_MODE

#define SPI_ENABLE_DUAL_INPUT_MODE | ( |  | spi | ) |

Enable Dual IO function and set SPI Dual IO direction to input.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 311 of file spi.h.

## ◆ SPI_ENABLE_DUAL_OUTPUT_MODE

#define SPI_ENABLE_DUAL_OUTPUT_MODE | ( |  | spi | ) |

Enable Dual IO function and set SPI Dual IO direction to output.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 319 of file spi.h.

## ◆ SPI_GET_RX_FIFO_COUNT

#define SPI_GET_RX_FIFO_COUNT | ( |  | spi | ) |

Get the count of available data in RX FIFO.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  The count of available data in RX FIFO.

Definition at line 111 of file spi.h.

## ◆ SPI_GET_RX_FIFO_EMPTY_FLAG

#define SPI_GET_RX_FIFO_EMPTY_FLAG | ( |  | spi | ) |

Get the Rx FIFO empty flag.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  Rx FIFO flag

Return values

  0 | Rx FIFO is not empty
  1 | Rx FIFO is empty

Definition at line 121 of file spi.h.

## ◆ SPI_GET_STATUS

#define SPI_GET_STATUS | ( |  | spi | ) |

Get the status register value.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  status value.

Definition at line 359 of file spi.h.

## ◆ SPI_GET_TX_FIFO_EMPTY_FLAG

#define SPI_GET_TX_FIFO_EMPTY_FLAG | ( |  | spi | ) |

Get the Tx FIFO empty flag.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  Tx FIFO flag

Return values

  0 | Tx FIFO is not empty
  1 | Tx FIFO is empty

Definition at line 131 of file spi.h.

## ◆ SPI_GET_TX_FIFO_FULL_FLAG

#define SPI_GET_TX_FIFO_FULL_FLAG | ( |  | spi | ) |

Get the Tx FIFO full flag.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  Tx FIFO flag

Return values

  0 | Tx FIFO is not full
  1 | Tx FIFO is full

Definition at line 141 of file spi.h.

## ◆ SPI_IS_BUSY

#define SPI_IS_BUSY | ( |  | spi | ) |

Get the SPI busy state.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  SPI busy status

Return values

  0 | SPI module is not busy
  1 | SPI module is busy

Definition at line 287 of file spi.h.

## ◆ SPI_READ_RX0

#define SPI_READ_RX0 | ( |  | spi | ) |

Get the datum read from RX0 FIFO.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  Data in Rx0 register.

Definition at line 149 of file spi.h.

## ◆ SPI_READ_RX1

#define SPI_READ_RX1 | ( |  | spi | ) | ( (spi)->RX1 )

Get the datum read from RX1 FIFO.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  Data in Rx1 register.

Definition at line 156 of file spi.h.

## ◆ SPI_SET_LSB_FIRST

#define SPI_SET_LSB_FIRST | ( |  | spi | ) |

Set the SPI transfer sequence with LSB first.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 254 of file spi.h.

## ◆ SPI_SET_MSB_FIRST

#define SPI_SET_MSB_FIRST | ( |  | spi | ) |

Set the SPI transfer sequence with MSB first.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 262 of file spi.h.

## ◆ SPI_SET_SS0_HIGH

#define SPI_SET_SS0_HIGH | ( |  | spi | ) |

Set SPIn_SS0 pin to high state.

Parameters

  [in] | spi | The pointer of the specified SPI module.

Returns
  None.

Disable automatic slave selection function and set SPIn_SS0 pin to high state. Only available in Master mode.

Definition at line 183 of file spi.h.

## ◆ SPI_SET_SS0_LOW

#define SPI_SET_SS0_LOW | ( |  | spi | ) |

Set SPIn_SS0 pin to low state.

Parameters

  [in] | spi | The pointer of the specified SPI module.

Returns
  None.

Disable automatic slave selection function and set SPIn_SS0 pin to low state. Only available in Master mode.

Definition at line 192 of file spi.h.

## ◆ SPI_SET_SS1_HIGH

#define SPI_SET_SS1_HIGH | ( |  | spi | ) |

Set SPIn_SS1 pin to high state.

Parameters

  [in] | spi | The pointer of the specified SPI module.

Returns
  None.

Disable automatic slave selection function and set SPIn_SS1 pin to high state. Only available in Master mode.

Definition at line 201 of file spi.h.

## ◆ SPI_SET_SS1_LOW

#define SPI_SET_SS1_LOW | ( |  | spi | ) |

Set SPIn_SS1 pin to low state.

Parameters

  [in] | spi | The pointer of the specified SPI module.

Returns
  None.

Disable automatic slave selection function and set SPIn_SS1 pin to low state. Only available in Master mode.

Definition at line 210 of file spi.h.

## ◆ SPI_SET_SS_LEVEL

#define SPI_SET_SS_LEVEL | ( |  | spi,
|  |  | ss0,
|  |  | ss1
| ) |  | ((spi)->SSR = ((spi)->SSR & ~(SPI_SSR_AUTOSS_Msk|SPI_SSR_SS_LVL_Msk|SPI_SSR_SSR_Msk)) | (((ss1)^1) << 1) | ((ss0)^1))

Set SPIn_SS0, SPIn_SS1 pin to high or low state.

Parameters

  [in] | spi | The pointer of the specified SPI module.
  [in] | ss0 | 0 = Set SPIn_SS0 to low. 1 = Set SPIn_SS0 to high.
  [in] | ss1 | 0 = Set SPIn_SS1 to low. 1 = Set SPIn_SS1 to high.

Returns
  None.

Disable automatic slave selection function and set SPIn_SS0/SPIn_SS1 pin to specified high/low state. Only available in Master mode.

Definition at line 221 of file spi.h.

## ◆ SPI_SET_SUSPEND_CYCLE

#define SPI_SET_SUSPEND_CYCLE | ( |  | spi,
|  |  | u32SuspCycle
| ) |  |

Set the length of suspend interval.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32SuspCycle | decides the length of suspend interval.

Returns
  none

Definition at line 246 of file spi.h.

## ◆ SPI_TRIGGER

#define SPI_TRIGGER | ( |  | spi | ) |

Set the GO_BUSY bit to trigger SPI transfer.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 295 of file spi.h.

## ◆ SPI_TRIGGER_RX_PDMA

#define SPI_TRIGGER_RX_PDMA | ( |  | spi | ) |

Trigger RX PDMA transfer.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 327 of file spi.h.

## ◆ SPI_TRIGGER_TX_PDMA

#define SPI_TRIGGER_TX_PDMA | ( |  | spi | ) |

Trigger TX PDMA transfer.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 335 of file spi.h.

## ◆ SPI_WRITE_TX0

#define SPI_WRITE_TX0 | ( |  | spi,
|  |  | u32TxData
| ) |  |

Write datum to TX0 register.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32TxData | is the datum which user attempt to transfer through SPI bus.

Returns
  none

Definition at line 165 of file spi.h.

## ◆ SPI_WRITE_TX1

#define SPI_WRITE_TX1 | ( |  | spi,
|  |  | u32TxData
| ) |  |

Write datum to TX1 register.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32TxData | is the datum which user attempt to transfer through SPI bus.

Returns
  none

Definition at line 174 of file spi.h.

## Function Documentation

## ◆ SPI_ClearRxFIFO()

void SPI_ClearRxFIFO | ( | SPI_T * | spi | ) |

Clear Rx FIFO buffer.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 91 of file spi.c.

## ◆ SPI_ClearTxFIFO()

void SPI_ClearTxFIFO | ( | SPI_T * | spi | ) |

Clear Tx FIFO buffer.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 101 of file spi.c.

## ◆ SPI_Close()

void SPI_Close | ( | SPI_T * | spi | ) |

Reset SPI module and disable SPI peripheral clock.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 66 of file spi.c.

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## ◆ SPI_DisableAutoSS()

void SPI_DisableAutoSS | ( | SPI_T * | spi | ) |

Disable the automatic slave select function.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 111 of file spi.c.

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## ◆ SPI_DisableFIFO()

void SPI_DisableFIFO | ( | SPI_T * | spi | ) |

Disable FIFO mode.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 202 of file spi.c.

## ◆ SPI_DisableInt()

void SPI_DisableInt | ( | SPI_T * | spi,
|  | uint32_t | u32Mask
| ) |  |

Disable FIFO related interrupts specified by u32Mask parameter.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32Mask | is the combination of all related interrupt enable bits. Each bit corresponds to a interrupt bit. This parameter decides which interrupts will be enabled. Valid values are: SPI_IE_MASK SPI_SSTA_INTEN_MASK SPI_FIFO_TX_INTEN_MASK SPI_FIFO_RX_INTEN_MASK SPI_FIFO_RXOVR_INTEN_MASK SPI_FIFO_TIMEOUT_INTEN_MASK

Returns
  none

Definition at line 292 of file spi.c.

## ◆ SPI_DisableWakeup()

void SPI_DisableWakeup | ( | SPI_T * | spi | ) |

Disable wake-up function.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 328 of file spi.c.

## ◆ SPI_EnableAutoSS()

void SPI_EnableAutoSS | ( | SPI_T * | spi,
|  | uint32_t | u32SSPinMask,
|  | uint32_t | u32ActiveLevel
| ) |  |

Enable the automatic slave select function. Only available in Master mode.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32SSPinMask | specifies slave select pins. (SPI_SS)
  [in] | u32ActiveLevel | specifies the active level of slave select signal. Valid values are: SPI_SS0_ACTIVE_HIGH SPI_SS0_ACTIVE_LOW SPI_SS1_ACTIVE_HIGH SPI_SS1_ACTIVE_LOW

Returns
  none

Definition at line 127 of file spi.c.

## ◆ SPI_EnableFIFO()

void SPI_EnableFIFO | ( | SPI_T * | spi,
|  | uint32_t | u32TxThreshold,
|  | uint32_t | u32RxThreshold
| ) |  |

Enable FIFO mode with user-specified Tx FIFO threshold and Rx FIFO threshold configurations.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32TxThreshold | decides the Tx FIFO threshold.
  [in] | u32RxThreshold | decides the Rx FIFO threshold.

Returns
  none

Definition at line 188 of file spi.c.

## ◆ SPI_EnableInt()

void SPI_EnableInt | ( | SPI_T * | spi,
|  | uint32_t | u32Mask
| ) |  |

Enable FIFO related interrupts specified by u32Mask parameter.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32Mask | is the combination of all related interrupt enable bits. Each bit corresponds to a interrupt bit. This parameter decides which interrupts will be enabled. Valid values are: SPI_IE_MASK SPI_SSTA_INTEN_MASK SPI_FIFO_TX_INTEN_MASK SPI_FIFO_RX_INTEN_MASK SPI_FIFO_RXOVR_INTEN_MASK SPI_FIFO_TIMEOUT_INTEN_MASK

Returns
  none

Definition at line 257 of file spi.c.

## ◆ SPI_EnableWakeup()

void SPI_EnableWakeup | ( | SPI_T * | spi | ) |

Enable wake-up function.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  none

Definition at line 318 of file spi.c.

## ◆ SPI_GetBusClock()

uint32_t SPI_GetBusClock | ( | SPI_T * | spi | ) |

Get the actual frequency of SPI bus clock. Only available in Master mode.

Parameters

  [in] | spi | is the base address of SPI module.

Returns
  Actual SPI bus clock frequency.

Definition at line 212 of file spi.c.

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## ◆ SPI_Open()

uint32_t SPI_Open | ( | SPI_T * | spi,
|  | uint32_t | u32MasterSlave,
|  | uint32_t | u32SPIMode,
|  | uint32_t | u32DataWidth,
|  | uint32_t | u32BusClock
| ) |  |

This function make SPI module be ready to transfer. By default, the SPI transfer sequence is MSB first and the automatic slave select function is disabled. In Slave mode, the u32BusClock must be NULL and the SPI clock divider setting will be 0.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32MasterSlave | decides the SPI module is operating in master mode or in slave mode. Valid values are: SPI_MASTER SPI_SLAVE
  [in] | u32SPIMode | decides the transfer timing. Valid values are: SPI_MODE_0 SPI_MODE_1 SPI_MODE_2 SPI_MODE_3
  [in] | u32DataWidth | decides the data width of a SPI transaction.
  [in] | u32BusClock | is the expected frequency of SPI bus clock in Hz.

Returns
  Actual frequency of SPI peripheral clock.

Definition at line 47 of file spi.c.

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## ◆ SPI_SET_DATA_WIDTH()

static __INLINE void SPI_SET_DATA_WIDTH | ( | SPI_T * | spi,
|  | uint32_t | u32Width
| ) |  |
| static

Set the data width of a SPI transaction.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32Width | is the data width (from 8-32 bits).

Returns
  none

Definition at line 271 of file spi.h.

## ◆ SPI_SetBusClock()

uint32_t SPI_SetBusClock | ( | SPI_T * | spi,
|  | uint32_t | u32BusClock
| ) |  |

Set the SPI bus clock. Only available in Master mode.

Parameters

  [in] | spi | is the base address of SPI module.
  [in] | u32BusClock | is the expected frequency of SPI bus clock.

Returns
  Actual frequency of SPI peripheral clock.

Definition at line 138 of file spi.c.

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