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// # << NEORV32: neorv32.h - Main Core Library File >>                                             #

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// # BSD 3-Clause License                                                                          #

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// # Copyright (c) 2020, Stephan Nolting. All rights reserved.                                     #

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// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #

// #################################################################################################

/**********************************************************************//**

 * @file neorv32.h

 * @author Stephan Nolting

 * @date 30 May 2020

 *

 * @brief Main NEORV32 core library file.

 *

 * @details This file defines the addresses of the IO devices and their according

 * registers and register bits as well as the available CPU CSRs and flags.

 **************************************************************************/

#ifndef neorv32_h

#define neorv32_h

// Standard libraries

#include <stdint.h>

#include <stdlib.h>

#include <string.h>

#include <stdbool.h>

#include <inttypes.h>

#include <limits.h>

/**********************************************************************//**

 * Available CPU Control and Status Registers (CSRs)

 **************************************************************************/

enum NEORV32_CPU_CSRS_enum {

  CSR_MSTATUS     = 0x300, /**< 0x300 - mstatus (r/w): Machine status register */

  CSR_MISA        = 0x301, /**< 0x301 - misa    (r/-): CPU ISA and extensions (read-only in NEORV32) */

  CSR_MIE         = 0x304, /**< 0x304 - mie     (r/w): Machine interrupt-enable register */

  CSR_MTVEC       = 0x305, /**< 0x305 - mtvec   (r/w): Machine trap-handler base address (for ALL traps) */

  CSR_MSCRATCH    = 0x340, /**< 0x340 - mscratch (r/w): Machine scratch register */

  CSR_MEPC        = 0x341, /**< 0x341 - mepc     (r/w): Machine exception program counter */

  CSR_MCAUSE      = 0x342, /**< 0x342 - mcause   (r/w): Machine trap cause */

  CSR_MTVAL       = 0x343, /**< 0x343 - mtval    (r/w): Machine bad address or instruction */

  CSR_MIP         = 0x344, /**< 0x344 - mip      (r/w): Machine interrupt pending register */

  CSR_MCYCLE      = 0xb00, /**< 0xb00 - mcycle    (r/w): Machine cycle counter low word */

  CSR_MINSTRET    = 0xb02, /**< 0xb02 - minstret  (r/w): Machine instructions-retired counter low word */

  CSR_MCYCLEH     = 0xb80, /**< 0xb80 - mcycleh   (r/w): Machine cycle counter high word - only 20-bit wide!*/

  CSR_MINSTRETH   = 0xb82, /**< 0xb82 - minstreth (r/w): Machine instructions-retired counter high word - only 20-bit wide! */

  CSR_CYCLE       = 0xc00, /**< 0xc00 - cycle    (r/-): Cycle counter low word (from MCYCLE) */

  CSR_TIME        = 0xc01, /**< 0xc01 - time     (r/-): Timer low word (from MTIME.TIME_LO) */

  CSR_INSTRET     = 0xc02, /**< 0xc02 - instret  (r/-): Instructions-retired counter low word (from MINSTRET) */

  CSR_CYCLEH      = 0xc80, /**< 0xc80 - cycleh   (r/-): Cycle counter high word (from MCYCLEH) - only 20-bit wide! */

  CSR_TIMEH       = 0xc81, /**< 0xc81 - timeh    (r/-): Timer high word (from MTIME.TIME_HI) */

  CSR_INSTRETH    = 0xc82, /**< 0xc82 - instreth (r/-): Instructions-retired counter high word (from MINSTRETH) - only 20-bit wide! */

  CSR_MVENDORID   = 0xf11, /**< 0xf11 - mvendorid (r/-): Vendor ID */

  CSR_MARCHID     = 0xf12, /**< 0xf12 - marchid   (r/-): Architecture ID */

  CSR_MIMPID      = 0xf13, /**< 0xf13 - mimpid    (r/-): Implementation ID/version */

  CSR_MHARTID     = 0xf14  /**< 0xf14 - mhartid   (r/-): Hardware thread ID (always 0) */

};

/**********************************************************************//**

 * CPU <b>mstatus</b> CSR (r/w): Machine status (RISC-V spec.)

 **************************************************************************/

enum NEORV32_CPU_MSTATUS_enum {

  CPU_MSTATUS_MIE  = 3, /**< CPU mstatus CSR (3): Machine interrupt enable bit (r/w) */

  CPU_MSTATUS_MPIE = 7  /**< CPU mstatus CSR (7): Machine previous interrupt enable bit (r/w) */

};

/**********************************************************************//**

 * CPU <b>mie</b> CSR (r/w): Machine interrupt enable (RISC-V spec.)

 **************************************************************************/

enum NEORV32_CPU_MIE_enum {

  CPU_MIE_MSIE  =  3, /**< CPU mie CSR (3): Machine software interrupt enable (r/w) */

  CPU_MIE_MTIE  =  7, /**< CPU mie CSR (7): Machine timer interrupt (MTIME) enable bit (r/w) */

  CPU_MIE_MEIE  = 11  /**< CPU mie CSR (11): Machine external interrupt (via CLIC) enable bit (r/w) */

};

/**********************************************************************//**

 * CPU <b>mip</b> CSR (r/-): Machine interrupt pending (RISC-V spec.)

 **************************************************************************/

enum NEORV32_CPU_MIP_enum {

  CPU_MIP_MSIP  =  3, /**< CPU mip CSR (3): Machine software interrupt pending (r/-) */

  CPU_MIP_MTIP  =  7, /**< CPU mip CSR (7): Machine timer interrupt (MTIME) pending (r/-) */

  CPU_MIP_MEIP  = 11  /**< CPU mip CSR (11): Machine external interrupt (via CLIC) pending (r/-) */

};

/**********************************************************************//**

 * CPU <b>misa</b> CSR (r/w): Machine instruction set extensions (RISC-V spec.)

 **************************************************************************/

enum NEORV32_CPU_MISA_enum {

  CPU_MISA_C_EXT      =  2, /**< CPU misa CSR  (2): C: Compressed instructions CPU extension available (r/-), can be switched on/off */

  CPU_MISA_E_EXT      =  4, /**< CPU misa CSR  (3): E: Embedded CPU extension available (r/-) */

  CPU_MISA_I_EXT      =  8, /**< CPU misa CSR  (8): I: Base integer ISA CPU extension available (r/-) */

  CPU_MISA_M_EXT      = 12, /**< CPU misa CSR (12): M: Multiplier/divider CPU extension available (r/-), can be switched on/off */

  CPU_MISA_X_EXT      = 23, /**< CPU misa CSR (23): X: Non-standard CPU extension available (r/-) */

  CPU_MISA_Z_EXT      = 25, /**< CPU misa CSR (25): Z: Privileged architecture CPU extension(s) available (r/-) */

  CPU_MISA_MXL_LO_EXT = 30, /**< CPU misa CSR (30): MXL.lo: CPU data width (r/-) */

  CPU_MISA_MXL_HI_EXT = 31  /**< CPU misa CSR (31): MXL.Hi: CPU data width (r/-) */

};

/**********************************************************************//**

 * Exception IDs.

 **************************************************************************/

enum NEORV32_EXCEPTION_IDS_enum {

  EXCID_I_MISALIGNED =  0, /**< 0: Instruction address misaligned */

  EXCID_I_ACCESS     =  1, /**< 1: Instruction (bus) access fault */

  EXCID_I_ILLEGAL    =  2, /**< 2: Illegal instruction */

  EXCID_BREAKPOINT   =  3, /**< 3: Breakpoint (EBREAK instruction) */

  EXCID_L_MISALIGNED =  4, /**< 4: Load address misaligned */

  EXCID_L_ACCESS     =  5, /**< 5: Load (bus) access fault */

  EXCID_S_MISALIGNED =  6, /**< 6: Store address misaligned */

  EXCID_S_ACCESS     =  7, /**< 7: Store (bus) access fault */

  EXCID_MENV_CALL    = 11, /**< 11: Environment call from machine mode (ECALL instruction) */

  EXCID_MSI          = 19, /**< 16 + 3: Machine software interrupt */

  EXCID_MTI          = 23, /**< 16 + 7: Machine timer interrupt (via MTIME) */

  EXCID_MEI          = 27  /**< 16 + 11: Machine external interrupt (via CLIC) */

};

/**********************************************************************//**

 * Exception codes from mcause CSR.

 **************************************************************************/

enum NEORV32_EXCEPTION_CODES_enum {

  EXCCODE_I_MISALIGNED = 0x00000000, /**< 0: Instruction address misaligned */

  EXCCODE_I_ACCESS     = 0x00000001, /**< 1: Instruction (bus) access fault */

  EXCCODE_I_ILLEGAL    = 0x00000002, /**< 2: Illegal instruction */

  EXCCODE_BREAKPOINT   = 0x00000003, /**< 3: Breakpoint (EBREAK instruction) */

  EXCCODE_L_MISALIGNED = 0x00000004, /**< 4: Load address misaligned */

  EXCCODE_L_ACCESS     = 0x00000005, /**< 5: Load (bus) access fault */

  EXCCODE_S_MISALIGNED = 0x00000006, /**< 6: Store address misaligned */

  EXCCODE_S_ACCESS     = 0x00000007, /**< 7: Store (bus) access fault */

  EXCCODE_MENV_CALL    = 0x0000000b, /**< 11: Environment call from machine mode (ECALL instruction) */

  EXCCODE_MSI          = 0x80000003, /**< 16 + 3: Machine software interrupt */

  EXCCODE_MTI          = 0x80000007, /**< 16 + 7: Machine timer interrupt (via MTIME) */

  EXCCODE_MEI          = 0x8000000b  /**< 16 + 11: Machine external interrupt (via CLIC) */

};

/**********************************************************************//**

 * Processor clock prescalers

 **************************************************************************/

enum NEORV32_CLOCK_PRSC_enum {

  CLK_PRSC_2    =  0, /**< CPU_CLK / 2 */

  CLK_PRSC_4    =  1, /**< CPU_CLK / 4 */

  CLK_PRSC_8    =  2, /**< CPU_CLK / 8 */

  CLK_PRSC_64   =  3, /**< CPU_CLK / 64 */

  CLK_PRSC_128  =  4, /**< CPU_CLK / 128 */

  CLK_PRSC_1024 =  5, /**< CPU_CLK / 1024 */

  CLK_PRSC_2048 =  6, /**< CPU_CLK / 2048 */

  CLK_PRSC_4096 =  7  /**< CPU_CLK / 4096 */

};

/**********************************************************************//**

 * @name Helper macros for easy memory-mapped register access

 **************************************************************************/

/**@{*/

/** memory-mapped byte (8-bit) read/write register */

#define IO_REG8  (volatile uint8_t*)

/** memory-mapped half-word (16-bit) read/write register */

#define IO_REG16 (volatile uint16_t*)

/** memory-mapped word (32-bit) read/write register */

#define IO_REG32 (volatile uint32_t*)

/** memory-mapped double-word (64-bit) read/write register */

#define IO_REG64 (volatile uint64_t*)

/** memory-mapped byte (8-bit) read-only register */

#define IO_ROM8  (const volatile uint8_t*) 

/** memory-mapped half-word (16-bit) read-only register */

#define IO_ROM16 (const volatile uint16_t*)

/** memory-mapped word (32-bit) read-only register */

#define IO_ROM32 (const volatile uint32_t*)

/** memory-mapped double-word (64-bit) read-only register */

#define IO_ROM64 (const volatile uint64_t*)

/**@}*/

/**********************************************************************//**

 * @name Address space sections

 **************************************************************************/

/**@{*/

/** instruction memory base address (r/w/x) */

// -> use value from MEM_ISPACE_BASE CSR

/** data memory base address (r/w/x) */

// -> use value from MEM_DSPACE_BASE CSR

/** bootloader memory base address (r/-/x) */

#define BOOTLOADER_BASE_ADDRESS (0xFFFF0000UL)

/** peripheral/IO devices memory base address (r/w/x) */

#define IO_BASE_ADDRESS (0xFFFFFF80UL)

/**@}*/

/**********************************************************************//**

 * @name IO Device: General Purpose Input/Output Port Unit (GPIO)

 **************************************************************************/

/**@{*/

/** GPIO parallel input port (r/-) */

#define GPIO_INPUT  (*(IO_ROM32 0xFFFFFF80UL))

/** GPIO parallel output port (r/w) */

#define GPIO_OUTPUT (*(IO_REG32 0xFFFFFF84UL))

/**@}*/

/**********************************************************************//**

 * @name IO Device: Core Local Interrupts Controller (CLIC)

 **************************************************************************/

/**@{*/

/** CLIC control register (r/w) */

#define CLIC_CT (*(IO_REG32 0xFFFFFF88UL))

/** CLIC control register bits */

enum NEORV32_CLIC_CT_enum {

  CLIC_CT_SRC0        =  0, /**< CLIC control register(0) (r/-): IRQ source bit 0 */

  CLIC_CT_SRC1        =  1, /**< CLIC control register(1) (r/-): IRQ source bit 1 */

  CLIC_CT_SRC2        =  2, /**< CLIC control register(2) (r/-): IRQ source bit 2 */

  CLIC_CT_ACK         =  3, /**< CLIC control register(3) (-/w): Acknowledge current IRQ when set, auto-clears when set */

  CLIC_CT_EN          =  4, /**< CLIC control register(4) (r/w): Unit enable */

  CLIC_CT_IRQ0_EN     =  8, /**< CLIC control register(8)  (r/w): Enable IRQ channel 0 */

  CLIC_CT_IRQ1_EN     =  9, /**< CLIC control register(9)  (r/w): Enable IRQ channel 1 */

  CLIC_CT_IRQ2_EN     = 10, /**< CLIC control register(10) (r/w): Enable IRQ channel 2 */

  CLIC_CT_IRQ3_EN     = 11, /**< CLIC control register(11) (r/w): Enable IRQ channel 3 */

  CLIC_CT_IRQ4_EN     = 12, /**< CLIC control register(12) (r/w): Enable IRQ channel 4 */

  CLIC_CT_IRQ5_EN     = 13, /**< CLIC control register(13) (r/w): Enable IRQ channel 5 */

  CLIC_CT_IRQ6_EN     = 14, /**< CLIC control register(14) (r/w): Enable IRQ channel 6 */

  CLIC_CT_IRQ7_EN     = 15, /**< CLIC control register(15) (r/w): Enable IRQ channel 7 */

  CLIC_CT_SW_IRQ_SRC0 = 16, /**< CLIC control register(16) (-/w): SW IRQ trigger, IRQ select bit 0, auto-clears when set */

  CLIC_CT_SW_IRQ_SRC1 = 17, /**< CLIC control register(17) (-/w): SW IRQ trigger, IRQ select bit 1, auto-clears when set */

  CLIC_CT_SW_IRQ_SRC2 = 18, /**< CLIC control register(18) (-/w): SW IRQ trigger, IRQ select bit 2, auto-clears when set */

  CLIC_CT_SW_IRQ_EN   = 19  /**< CLIC control register(19) (-/w): SW IRQ trigger enable, auto-clears when set */

};

/**@}*/

/**********************************************************************//**

 * Core-local interrupt controller IRQ channel

 **************************************************************************/

enum NEORV32_CLIC_CHANNELS_enum {

  CLIC_CH_WDT   = 0, /**< CLIC channel 0: Watchdog timer overflow interrupt */

  CLIC_CH_RES   = 1, /**< CLIC channel 1: reserved */

  CLIC_CH_GPIO  = 2, /**< CLIC channel 2: GPIO pin-change interrupt */

  CLIC_CH_UART  = 3, /**< CLIC channel 3: UART RX available or TX done interrupt */

  CLIC_CH_SPI   = 4, /**< CLIC channel 4: SPI transmission done interrupt */

  CLIC_CH_TWI   = 5, /**< CLIC channel 5: TWI transmission done interrupt */

  CLIC_CH_EXT0  = 6, /**< CLIC channel 6: Processor-external interrupt request 0 */

  CLIC_CH_EXT1  = 7  /**< CLIC channel 7: Processor-external interrupt request 1 */

};

/**********************************************************************//**

 * @name IO Device: Watchdog Timer (WDT)

 **************************************************************************/

/**@{*/

/** Watchdog control register (r/w) */

#define WDT_CT (*(IO_REG32 0xFFFFFF8CUL))

/** WTD control register bits */

enum NEORV32_WDT_CT_enum {

  WDT_CT_CLK_SEL0     =  0, /**< WDT control register(0) (r/w): Clock prescaler select bit 0 */

  WDT_CT_CLK_SEL1     =  1, /**< WDT control register(1) (r/w): Clock prescaler select bit 1 */

  WDT_CT_CLK_SEL2     =  2, /**< WDT control register(2) (r/w): Clock prescaler select bit 2 */

  WDT_CT_EN           =  3, /**< WDT control register(3) (r/w): Watchdog enable */

  WDT_CT_MODE         =  4, /**< WDT control register(4) (r/w): Watchdog mode; when 0: timeout causes interrupt; when 1: timeout causes processor reset */

  WDT_CT_CAUSE        =  5, /**< WDT control register(5) (r/-): Last action (reset/IRQ) cause (0: external reset, 1: watchdog timeout) */

  WDT_CT_PWFAIL       =  6, /**< WDT control register(6) (r/-): Last Watchdog action (reset/IRQ) caused by wrong password when 1 */

  WDT_CT_PASSWORD_LSB =  8, /**< WDT control register(8)  (-/w): First bit / position begin for watchdog access password */

  WDT_CT_PASSWORD_MSB = 15  /**< WDT control register(15) (-/w): Last bit / position end for watchdog access password */

};

/** Watchdog access passwort, must be set in WDT_CT bits 15:8 for every control register access */

#define WDT_PASSWORD 0x47

/**@}*/

/**********************************************************************//**

 * @name IO Device: Machine System Timer (MTIME)

 **************************************************************************/

/**@{*/

/** MTIME (time register) low word (r/w) */

#define MTIME_LO     (*(IO_REG32 0xFFFFFF90UL))

/** MTIME (time register) high word (r/w) */

#define MTIME_HI     (*(IO_REG32 0xFFFFFF94UL))

/** MTIMECMP (time compare register) low word (r/w) */

#define MTIMECMP_LO  (*(IO_REG32 0xFFFFFF98UL))

/** MTIMECMP (time register) high word (r/w) */

#define MTIMECMP_HI  (*(IO_REG32 0xFFFFFF9CUL))

/** MTIME (time register) 64-bit access (r/w) */

#define MTIME        (*(IO_REG64 (&MTIME_LO)))

/** MTIMECMP (time compare register) low word (r/w) */

#define MTIMECMP     (*(IO_REG64 (&MTIMECMP_LO)))

/**@}*/

/**********************************************************************//**

 * @name IO Device: Universal Asynchronous Receiver and Transmitter (UART)

 **************************************************************************/

/**@{*/

/** UART control register (r/w) */

#define UART_CT  (*(IO_REG32 0xFFFFFFA0UL))

/** UART receive/transmit data register (r/w) */

#define UART_DATA (*(IO_REG32 0xFFFFFFA4UL))

/** UART control register bits */

enum NEORV32_UART_CT_enum {

  UART_CT_BAUD00  =  0, /**< UART control register(0)  (r/w): BAUD rate config value lsb (12-bi, bit 0) */

  UART_CT_BAUD01  =  1, /**< UART control register(1)  (r/w): BAUD rate config value (12-bi, bit 1) */

  UART_CT_BAUD02  =  2, /**< UART control register(2)  (r/w): BAUD rate config value (12-bi, bit 2) */

  UART_CT_BAUD03  =  3, /**< UART control register(3)  (r/w): BAUD rate config value (12-bi, bit 3) */

  UART_CT_BAUD04  =  4, /**< UART control register(4)  (r/w): BAUD rate config value (12-bi, bit 4) */

  UART_CT_BAUD05  =  5, /**< UART control register(5)  (r/w): BAUD rate config value (12-bi, bit 4) */

  UART_CT_BAUD06  =  6, /**< UART control register(6)  (r/w): BAUD rate config value (12-bi, bit 5) */

  UART_CT_BAUD07  =  7, /**< UART control register(7)  (r/w): BAUD rate config value (12-bi, bit 6) */

  UART_CT_BAUD08  =  8, /**< UART control register(8)  (r/w): BAUD rate config value (12-bi, bit 7) */

  UART_CT_BAUD09  =  9, /**< UART control register(9)  (r/w): BAUD rate config value (12-bi, bit 8) */

  UART_CT_BAUD10  = 10, /**< UART control register(10) (r/w): BAUD rate config value (12-bi, bit 9) */

  UART_CT_BAUD11  = 11, /**< UART control register(11) (r/w): BAUD rate config value msb (12-bi, bit 0)*/

  UART_CT_PRSC0   = 24, /**< UART control register(24) (r/w): BAUD rate clock prescaler select bit 0 */

  UART_CT_PRSC1   = 25, /**< UART control register(25) (r/w): BAUD rate clock prescaler select bit 1 */

  UART_CT_PRSC2   = 26, /**< UART control register(26) (r/w): BAUD rate clock prescaler select bit 2 */

  UART_CT_RXOR    = 27, /**< UART control register(27) (r/-): RX data overrun when set */

  UART_CT_EN      = 28, /**< UART control register(28) (r/w): UART global enable */

  UART_CT_RX_IRQ  = 29, /**< UART control register(29) (r/w): Activate interrupt on RX done */

  UART_CT_TX_IRQ  = 30, /**< UART control register(30) (r/w): Activate interrupt on TX done */

  UART_CT_TX_BUSY = 31  /**< UART control register(31) (r/-): Transmitter is busy when set */

};

/** UART receive/transmit data register bits */

enum NEORV32_UART_DATA_enum {

  UART_DATA_LSB   =  0, /**< UART receive/transmit data register(0)  (r/w): Receive/transmit data LSB (bit 0) */

  UART_DATA_MSB   =  7, /**< UART receive/transmit data register(7)  (r/w): Receive/transmit data MSB (bit 7) */

  UART_DATA_AVAIL = 31  /**< UART receive/transmit data register(31) (r/-): RX data available when set */

};

/**@}*/

/**********************************************************************//**

 * @name IO Device: Serial Peripheral Interface Controller (SPI)

 **************************************************************************/

/**@{*/

/** SPI control register (r/w) */

#define SPI_CT  (*(IO_REG32 0xFFFFFFA8UL))

/** SPI receive/transmit data register (r/w) */

#define SPI_DATA (*(IO_REG32 0xFFFFFFACUL))

/** SPI control register bits */

enum NEORV32_SPI_CT_enum {

  SPI_CT_CS0    =  0, /**< UART control register(0) (r/w): Direct chip select line 0 (output is low when set) */

  SPI_CT_CS1    =  1, /**< UART control register(1) (r/w): Direct chip select line 1 (output is low when set) */

  SPI_CT_CS2    =  2, /**< UART control register(2) (r/w): Direct chip select line 2 (output is low when set) */

  SPI_CT_CS3    =  3, /**< UART control register(3) (r/w): Direct chip select line 3 (output is low when set) */

  SPI_CT_CS4    =  4, /**< UART control register(4) (r/w): Direct chip select line 4 (output is low when set) */

  SPI_CT_CS5    =  5, /**< UART control register(5) (r/w): Direct chip select line 5 (output is low when set) */

  SPI_CT_CS6    =  6, /**< UART control register(6) (r/w): Direct chip select line 6 (output is low when set) */

  SPI_CT_CS7    =  7, /**< UART control register(7) (r/w): Direct chip select line 7 (output is low when set) */

  SPI_CT_EN     =  8, /**< UART control register(8) (r/w): SPI unit enable */

  SPI_CT_CPHA   =  9, /**< UART control register(9) (r/w): Clock polarity (idle polarity) */

  SPI_CT_PRSC0  = 10, /**< UART control register(10) (r/w): Clock prescaler select bit 0 */

  SPI_CT_PRSC1  = 11, /**< UART control register(11) (r/w): Clock prescaler select bit 1 */

  SPI_CT_PRSC2  = 12, /**< UART control register(12) (r/w): Clock prescaler select bit 2 */

  SPI_CT_DIR    = 13, /**< UART control register(13) (r/w): Shift direction (0: MSB first, 1: LSB first) */

  SPI_CT_SIZE0  = 14, /**< UART control register(14) (r/w): Transfer data size lsb (00: 8-bit, 01: 16-bit, 10: 24-bit, 11: 32-bit) */

  SPI_CT_SIZE1  = 15, /**< UART control register(15) (r/w): Transfer data size lsb (00: 8-bit, 01: 16-bit, 10: 24-bit, 11: 32-bit) */

  SPI_CT_IRQ_EN = 16, /**< UART control register(16) (r/w): Transfer done interrupt enable */

  SPI_CT_BUSY   = 31  /**< UART control register(31) (r/-): SPI busy flag */

};

/**@}*/

/**********************************************************************//**

 * @name IO Device: Two-Wire Interface Controller (TWI)

 **************************************************************************/

/**@{*/

/** TWI control register (r/w) */

#define TWI_CT   (*(IO_REG32 0xFFFFFFB0UL))

/** TWI receive/transmit data register (r/w) */

#define TWI_DATA (*(IO_REG32 0xFFFFFFB4UL))

/** TWI control register bits */

enum NEORV32_TWI_CT_enum {

  TWI_CT_EN     =  0, /**< TWI control register(0) (r/w): TWI enable */

  TWI_CT_START  =  1, /**< TWI control register(1) (-/w): Generate START condition, auto-clears */

  TWI_CT_STOP   =  2, /**< TWI control register(2) (-/w): Generate STOP condition, auto-clears */

  TWI_CT_IRQ_EN =  3, /**< TWI control register(3) (r/w): Enable transmission done interrupt */

  TWI_CT_PRSC0  =  4, /**< TWI control register(4) (r/w): Clock prescaler select bit 0 */

  TWI_CT_PRSC1  =  5, /**< TWI control register(5) (r/w): Clock prescaler select bit 1 */

  TWI_CT_PRSC2  =  6, /**< TWI control register(6) (r/w): Clock prescaler select bit 2 */

  TWI_CT_MACK   =  7, /**< TWI control register(7) (r/w): Generate controller ACK for each transmission */

  TWI_CT_ACK    = 30, /**< TWI control register(30) (r/-): ACK received when set */

  TWI_CT_BUSY   = 31  /**< TWI control register(31) (r/-): Transfer in progress, busy flag */

};

/** WTD receive/transmit data register bits */

enum NEORV32_TWI_DATA_enum {

  TWI_DATA_LSB = 0, /**< TWI data register(0) (r/w): Receive/transmit data (8-bit) LSB */

  TWI_DATA_MSB = 7  /**< TWI data register(7) (r/w): Receive/transmit data (8-bit) MSB */

};

/**@}*/

/**********************************************************************//**

 * @name IO Device: Pulse Width Modulation Controller (PWM)

 **************************************************************************/

/**@{*/

/** PWM control register (r/w) */

#define PWM_CT   (*(IO_REG32 0xFFFFFFB8UL)) // r/w: control register

/** PWM duty cycle register (4-channels) (r/w) */

#define PWM_DUTY (*(IO_REG32 0xFFFFFFBCUL)) // r/w: duty cycle channel 1 and 0

/** PWM control register bits */

enum NEORV32_PWM_CT_enum {

  PWM_CT_EN    =  0, /**< PWM control register(0) (r/w): PWM controller enable */

  PWM_CT_PRSC0 =  1, /**< PWM control register(1) (r/w): Clock prescaler select bit 0 */

  PWM_CT_PRSC1 =  2, /**< PWM control register(2) (r/w): Clock prescaler select bit 1 */

  PWM_CT_PRSC2 =  3  /**< PWM control register(3) (r/w): Clock prescaler select bit 2 */

};

/**PWM duty cycle register bits */

enum NEORV32_PWM_DUTY_enum {

  PWM_DUTY_CH0_LSB =  0, /**< PWM duty cycle register(0)  (r/w): Channel 0 duty cycle (8-bit) LSB */

  PWM_DUTY_CH0_MSB =  7, /**< PWM duty cycle register(7)  (r/w): Channel 0 duty cycle (8-bit) MSB */

  PWM_DUTY_CH1_LSB =  8, /**< PWM duty cycle register(8)  (r/w): Channel 1 duty cycle (8-bit) LSB */

  PWM_DUTY_CH1_MSB = 15, /**< PWM duty cycle register(15) (r/w): Channel 1 duty cycle (8-bit) MSB */

  PWM_DUTY_CH2_LSB = 16, /**< PWM duty cycle register(16) (r/w): Channel 2 duty cycle (8-bit) LSB */

  PWM_DUTY_CH2_MSB = 23, /**< PWM duty cycle register(23) (r/w): Channel 2 duty cycle (8-bit) MSB */

  PWM_DUTY_CH3_LSB = 24, /**< PWM duty cycle register(24) (r/w): Channel 3 duty cycle (8-bit) LSB */

  PWM_DUTY_CH3_MSB = 31  /**< PWM duty cycle register(31) (r/w): Channel 3 duty cycle (8-bit) MSB */

};

/**@}*/

/**********************************************************************//**

 * @name IO Device: True Random Number Generator (TRNG)

 **************************************************************************/

/**@{*/

/** TRNG control register (r/w) */

#define TRNG_CT   (*(IO_REG32 0xFFFFFFC0UL))

/** TRNG data register (r/-) */

#define TRNG_DATA (*(IO_ROM32 0xFFFFFFC4UL))

/** TRNG control register bits */

enum NEORV32_TRNG_CT_enum {

  TRNG_CT_TAP_LSB =  0, /**< TRNG control register(0)  (r/w): TAP mask (16-bit) LSB */

  TRNG_CT_TAP_MSB = 15, /**< TRNG control register(15) (r/w): TAP mask (16-bit) MSB */

  TRNG_CT_EN      = 31  /**< TRNG control register(31) (r/w): TRNG enable */

};

/** WTD data register bits */

enum NEORV32_TRNG_DUTY_enum {

  TRNG_DATA_LSB   =  0, /**< TRNG data register(0)  (r/-): Random data (16-bit) LSB */

  TRNG_DATA_MSB   = 15, /**< TRNG data register(15) (r/-): Random data (16-bit) MSB */

  TRNG_DATA_VALID = 31  /**< TRNG data register(31) (r/-): Random data output valid */

};

/**@}*/

/**********************************************************************//**

 * @name IO Device: Dummy Device (DEVNULL)

 **************************************************************************/

/**@{*/

/** DEVNULL data register (r/w) */

#define DEVNULL_DATA (*(IO_REG32 0xFFFFFFC8UL))

/**@}*/

/**********************************************************************//**

 * @name IO Device: System Configuration Info Memory (SYSINFO)

 **************************************************************************/

/**@{*/

/** SYSINFO(0): Clock speed */

#define SYSINFO_CLK         (*(IO_ROM32 0xFFFFFFE0UL))

/** SYSINFO(1): Custom user code (via "USER_CODE" generic) */

#define SYSINFO_USER_CODE   (*(IO_ROM32 0xFFFFFFE4UL))

/** SYSINFO(2): Clock speed */

#define SYSINFO_FEATURES    (*(IO_ROM32 0xFFFFFFE8UL))

/** SYSINFO(3): reserved */

#define SYSINFO_reserved1   (*(IO_ROM32 0xFFFFFFECUL))

/** SYSINFO(4): Instruction memory address space base */

#define SYSINFO_ISPACE_BASE (*(IO_ROM32 0xFFFFFFF0UL))

/** SYSINFO(5): Data memory address space base */

#define SYSINFO_DSPACE_BASE (*(IO_ROM32 0xFFFFFFF4UL))

/** SYSINFO(6): Instruction memory address space size in bytes */

#define SYSINFO_ISPACE_SIZE (*(IO_ROM32 0xFFFFFFF8UL))

/** SYSINFO(7): Data memory address space size in bytes */

#define SYSINFO_DSPACE_SIZE (*(IO_ROM32 0xFFFFFFFCUL))

/**@}*/

/**********************************************************************//**

 * SYSINFO_FEATURES (r/-): Implemented processor devices/features

 **************************************************************************/

 enum NEORV32_SYSINFO_FEATURES_enum {

  SYSINFO_FEATURES_BOOTLOADER       =  0, /**< SYSINFO_FEATURES  (0) (r/-): Bootloader implemented when 1 (via BOOTLOADER_USE generic) */

  SYSINFO_FEATURES_MEM_EXT          =  1, /**< SYSINFO_FEATURES  (1) (r/-): External bus interface implemented when 1 (via MEM_EXT_USE generic) */

  SYSINFO_FEATURES_MEM_INT_IMEM     =  2, /**< SYSINFO_FEATURES  (2) (r/-): Processor-internal instruction memory implemented when 1 (via MEM_INT_IMEM_USE generic) */

  SYSINFO_FEATURES_MEM_INT_IMEM_ROM =  3, /**< SYSINFO_FEATURES  (3) (r/-): Processor-internal instruction memory implemented as ROM when 1 (via MEM_INT_IMEM_ROM generic) */

  SYSINFO_FEATURES_MEM_INT_DMEM     =  4, /**< SYSINFO_FEATURES  (4) (r/-): Processor-internal data memory implemented when 1 (via MEM_INT_DMEM_USE generic) */

  SYSINFO_FEATURES_IO_GPIO          = 16, /**< SYSINFO_FEATURES (16) (r/-): General purpose input/output port unit implemented when 1 (via IO_GPIO_USE generic) */

  SYSINFO_FEATURES_IO_MTIME         = 17, /**< SYSINFO_FEATURES (17) (r/-): Machine system timer implemented when 1 (via IO_MTIME_USE generic) */

  SYSINFO_FEATURES_IO_UART          = 18, /**< SYSINFO_FEATURES (18) (r/-): Universal asynchronous receiver/transmitter implemented when 1 (via IO_UART_USE generic) */

  SYSINFO_FEATURES_IO_SPI           = 19, /**< SYSINFO_FEATURES (19) (r/-): Serial peripheral interface implemented when 1 (via IO_SPI_USE generic) */

  SYSINFO_FEATURES_IO_TWI           = 20, /**< SYSINFO_FEATURES (20) (r/-): Two-wire interface implemented when 1 (via IO_TWI_USE generic) */

  SYSINFO_FEATURES_IO_PWM           = 21, /**< SYSINFO_FEATURES (21) (r/-): Pulse-width modulation unit implemented when 1 (via IO_PWM_USE generic) */

  SYSINFO_FEATURES_IO_WDT           = 22, /**< SYSINFO_FEATURES (22) (r/-): Watchdog timer implemented when 1 (via IO_WDT_USE generic) */

  SYSINFO_FEATURES_IO_CLIC          = 23, /**< SYSINFO_FEATURES (23) (r/-): Core-local interrupt controller implemented when 1 (via IO_CLIC_USE generic) */

  SYSINFO_FEATURES_IO_TRNG          = 24, /**< SYSINFO_FEATURES (24) (r/-): True random number generator implemented when 1 (via IO_TRNG_USE generic) */

  SYSINFO_FEATURES_IO_DEVNULL       = 25  /**< SYSINFO_FEATURES (24) (r/-): Dummy device implemented when 1 (via IO_DEVNULL_USE generic) */

};

// ----------------------------------------------------------------------------

// Include all IO driver headers

// ----------------------------------------------------------------------------

// cpu core

#include "neorv32_cpu.h"

// neorv32 runtime environment

#include "neorv32_rte.h"

// io/peripheral devices

#include "neorv32_clic.h"

#include "neorv32_gpio.h"

#include "neorv32_mtime.h"

#include "neorv32_pwm.h"

#include "neorv32_spi.h"

#include "neorv32_trng.h"

#include "neorv32_twi.h"

#include "neorv32_uart.h"

#include "neorv32_wdt.h"

#endif // neorv32_h