#endif /* USART_HAS_PDC */
+/**
+ * SPI Control Register
+ * \{
+ */
+#define SPI_CR_OFF 0x00000000 ///< Control register offset.
+#define SPI_CR (*((reg32_t *)(SPI_BASE + SPI_CR_OFF))) ///< SPI control register.
+#define SPI_SPIEN 0 ///< SPI enable.
+#define SPI_SPIDIS 1 ///< SPI disable.
+#define SPI_SWRST 7 ///< Software reset.
+#define SPI_LASTXFER 24 ///< Last transfer.
+/*\}*/
+
+/**
+ * SPI Mode Register
+ * \{
+ */
+#define SPI_MR_OFF 0x00000004 ///< Mode register offset.
+#define SPI_MR (*((reg32_t *)(SPI_BASE + SPI_MR_OFF))) ///< SPI mode register.
+#define SPI_MSTR 0 ///< Master mode.
+#define SPI_PS 1 ///< Peripheral select.
+#define SPI_PCSDEC 2 ///< Chip select decode.
+#define SPI_MODFDIS 4 ///< Mode fault detection.
+#define SPI_LLB 7 ///< Local loopback enable.
+#define SPI_PCS 0x000F0000 ///< Peripheral chip select mask.
+#define SPI_PCS_0 0x000E0000 ///< Peripheral chip select 0.
+#define SPI_PCS_1 0x000D0000 ///< Peripheral chip select 1.
+#define SPI_PCS_2 0x000B0000 ///< Peripheral chip select 2.
+#define SPI_PCS_3 0x00070000 ///< Peripheral chip select 3.
+#define SPI_PCS_LSB 16 ///< Least significant bit of peripheral chip select.
+#define SPI_DLYBCS 0xFF000000 ///< Mask for delay between chip selects.
+#define SPI_DLYBCS_LSB 24 ///< Least significant bit of delay between chip selects.
+/*\}*/
+
+/**
+ * SPI Receive Data Register
+ * \{
+ */
+#define SPI_RDR_OFF 0x00000008 ///< Receive data register offset.
+#define SPI_RDR (*((reg32_t *)(SPI_BASE + SPI_RDR_OFF))) ///< SPI receive data register.
+#define SPI_RD 0x0000FFFF ///< Receive data mask.
+#define SPI_RD_LSB 0 ///< Least significant bit of receive data.
+/*\}*/
+
+/**
+ * SPI Transmit Data Register
+ * \{
+ */
+#define SPI_TDR_OFF 0x0000000C ///< Transmit data register offset.
+#define SPI_TDR (*((reg32_t *)(SPI_BASE + SPI_TDR_OFF))) ///< SPI transmit data register.
+#define SPI_TD 0x0000FFFF ///< Transmit data mask.
+#define SPI_TD_LSB 0 ///< Least significant bit of transmit data.
+/*\}*/
+
+/**
+ * SPI Status and Interrupt Register
+ * \{
+ */
+#define SPI_SR_OFF 0x00000010 ///< Status register offset.
+#define SPI_SR (*((reg32_t *)(SPI_BASE + SPI_SR_OFF))) ///< Status register.
+#define SPI_IER_OFF 0x00000014 ///< Interrupt enable register offset.
+#define SPI_IER (*((reg32_t *)(SPI_BASE + SPI_IER_OFF))) ///< Interrupt enable register.
+#define SPI_IDR_OFF 0x00000018 ///< Interrupt disable register offset.
+#define SPI_IDR (*((reg32_t *)(SPI_BASE + SPI_IDR_OFF))) ///< Interrupt disable register.
+#define SPI_IMR_OFF 0x0000001C ///< Interrupt mask register offset.
+#define SPI_IMR (*((reg32_t *)(SPI_BASE + SPI_IMR_OFF))) ///< Interrupt mask register.
+
+#define SPI_RDRF 0 ///< Receive data register full.
+#define SPI_TDRE 1 ///< Transmit data register empty.
+#define SPI_MODF 2 ///< Mode fault error.
+#define SPI_OVRES 3 ///< Overrun error status.
+#define SPI_ENDRX 4 ///< End of RX buffer.
+#define SPI_ENDTX 5 ///< End of TX buffer.
+#define SPI_RXBUFF 6 ///< RX buffer full.
+#define SPI_TXBUFE 7 ///< TX buffer empty.
+#define SPI_NSSR 8 ///< NSS rising.
+#define SPI_TXEMPTY 9 ///< Transmission register empty.
+#define SPI_SPIENS 16 ///< SPI enable status.
+/*\}*/
+
+/**
+ * SPI Chip Select Registers
+ * \{
+ */
+#define SPI_CSR0_OFF 0x00000030 ///< Chip select register 0 offset.
+#define SPI_CS0 (*((reg32_t *)(SPI_BASE + SPI_CSR0_OFF))) ///< Chip select register 0.
+#define SPI_CSR1_OFF 0x00000034 ///< Chip select register 1 offset.
+#define SPI_CS1 (*((reg32_t *)(SPI_BASE + SPI_CSR1_OFF))) ///< Chip select register 1.
+#define SPI_CSR2_OFF 0x00000038 ///< Chip select register 2 offset.
+#define SPI_CS2 (*((reg32_t *)(SPI_BASE + SPI_CSR2_OFF))) ///< Chip select register 2.
+#define SPI_CSR3_OFF 0x0000003C ///< Chip select register 3 offset.
+#define SPI_CS3 (*((reg32_t *)(SPI_BASE + SPI_CSR3_OFF))) ///< Chip select register 3.
+
+#define SPI_CPOL 0 ///< Clock polarity.
+#define SPI_NCPHA 1 ///< Clock phase.
+#define SPI_CSAAT 3 ///< Chip select active after transfer.
+#define SPI_BITS 0x000000F0 ///< Bits per transfer mask.
+#define SPI_BITS_8 0x00000000 ///< 8 bits per transfer.
+#define SPI_BITS_9 0x00000010 ///< 9 bits per transfer.
+#define SPI_BITS_10 0x00000020 ///< 10 bits per transfer.
+#define SPI_BITS_11 0x00000030 ///< 11 bits per transfer.
+#define SPI_BITS_12 0x00000040 ///< 12 bits per transfer.
+#define SPI_BITS_13 0x00000050 ///< 13 bits per transfer.
+#define SPI_BITS_14 0x00000060 ///< 14 bits per transfer.
+#define SPI_BITS_15 0x00000070 ///< 15 bits per transfer.
+#define SPI_BITS_16 0x00000080 ///< 16 bits per transfer.
+#define SPI_BITS_LSB 4 ///< Least significant bit of bits per transfer.
+#define SPI_SCBR 0x0000FF00 ///< Serial clock baud rate mask.
+#define SPI_SCBR_LSB 8 ///< Least significant bit of serial clock baud rate.
+#define SPI_DLYBS 0x00FF0000 ///< Delay before SPCK mask.
+#define SPI_DLYBS_LSB 16 ///< Least significant bit of delay before SPCK.
+#define SPI_DLYBCT 0xFF000000 ///< Delay between consecutive transfers mask.
+#define SPI_DLYBCT_LSB 24 ///< Least significant bit of delay between consecutive transfers.
+/*\}*/
+
#endif /* AT91_US_H */
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