EBI - External Bus Interface#

EBI External Bus Interface (EBI) Peripheral API.

This module contains functions to control the EBI peripheral of Silicon Labs 32-bit MCUs and SoCs. The EBI is used for accessing external parallel devices. The devices appear as part of the internal memory map of the MCU.

Modules#

EBI_Init_TypeDef

Enumerations#

enum

EBI_Mode_TypeDef {

ebiModeD8A8 = EBI_CTRL_MODE_D8A8

ebiModeD16A16ALE = EBI_CTRL_MODE_D16A16ALE

ebiModeD8A24ALE = EBI_CTRL_MODE_D8A24ALE

}

EBI Mode of operation.

enum

EBI_Polarity_TypeDef {

ebiActiveLow = 0

ebiActiveHigh = 1

}

EBI Polarity configuration.

enum

EBI_Line_TypeDef {

ebiLineARDY

ebiLineALE

ebiLineWE

ebiLineRE

ebiLineCS

}

EBI Pin Line types.

Functions#

void

EBI_Init(const EBI_Init_TypeDef *ebiInit)

Configure and enable the External Bus Interface.

void

EBI_Disable(void)

Disable External Bus Interface.

uint32_t

EBI_BankAddress(uint32_t bank)

Return the base address of the EBI bank.

void

EBI_BankEnable(uint32_t banks, bool enable)

Enable or disable EBI Bank.

void

EBI_ChipSelectEnable(uint32_t cs, bool enable)

Enable or disable EBI Chip Select.

void

EBI_ReadTimingSet(uint32_t setupCycles, uint32_t strobeCycles, uint32_t holdCycles)

Configure timing values of read bus accesses.

void

EBI_WriteTimingSet(uint32_t setupCycles, uint32_t strobeCycles, uint32_t holdCycles)

Configure timing values of write bus accesses.

void

EBI_AddressTimingSet(uint32_t setupCycles, uint32_t holdCycles)

Configure timing values of address latch bus accesses.

void

EBI_PolaritySet(EBI_Line_TypeDef line, EBI_Polarity_TypeDef polarity)

Configure EBI pin polarity.

Macros#

#define

EBI_BANK0 (uint32_t)(1 << 1)

EBI address bank 0.

#define

EBI_BANK1 (uint32_t)(1 << 2)

EBI address bank 1.

#define

EBI_BANK2 (uint32_t)(1 << 3)

EBI address bank 2.

#define

EBI_BANK3 (uint32_t)(1 << 4)

EBI address bank 3.

#define

EBI_CS0 (uint32_t)(1 << 1)

EBI chip select line 0.

#define

EBI_CS1 (uint32_t)(1 << 2)

EBI chip select line 1.

#define

EBI_CS2 (uint32_t)(1 << 3)

EBI chip select line 2.

#define

EBI_CS3 (uint32_t)(1 << 4)

EBI chip select line 3.

#define

EBI_INIT_DEFAULT undefined

Default configuration for EBI initialization structures.

Enumeration Documentation#

EBI_Mode_TypeDef#

EBI_Mode_TypeDef

EBI Mode of operation.

Enumerator
ebiModeD8A8	8 data bits, 8 address bits.
ebiModeD16A16ALE	16 data bits, 16 address bits, using address latch enable.
ebiModeD8A24ALE	8 data bits, 24 address bits, using address latch enable.

EBI_Polarity_TypeDef#

EBI_Polarity_TypeDef

EBI Polarity configuration.

Enumerator
ebiActiveLow	Active Low.
ebiActiveHigh	Active High.

EBI_Line_TypeDef#

EBI_Line_TypeDef

EBI Pin Line types.

Enumerator
ebiLineARDY	Address Ready line.
ebiLineALE	Address Latch Enable line.
ebiLineWE	Write Enable line.
ebiLineRE	Read Enable line.
ebiLineCS	Chip Select line.

Function Documentation#

EBI_Init#

void EBI_Init (const EBI_Init_TypeDef * ebiInit)

Configure and enable the External Bus Interface.

Parameters

Type	Direction	Argument Name	Description
const EBI_Init_TypeDef *	[in]	ebiInit	The EBI configuration structure.

Note

GPIO lines must be configured as a PUSH_PULL for the correct operation. GPIO and EBI clocks must be enabled in the CMU.

EBI_Disable#

void EBI_Disable (void )

Disable External Bus Interface.

Parameters

Type	Direction	Argument Name	Description
void	N/A

EBI_BankAddress#

uint32_t EBI_BankAddress (uint32_t bank)

Return the base address of the EBI bank.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	bank	A bank to return the start address for.

Returns

an absolute address of the bank.

EBI_BankEnable#

void EBI_BankEnable (uint32_t banks, bool enable)

Enable or disable EBI Bank.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	banks	Banks to reconfigure, mask of EBI_BANK<n> flags.
bool	[in]	enable	True to enable, false to disable.

EBI_ChipSelectEnable#

void EBI_ChipSelectEnable (uint32_t cs, bool enable)

Enable or disable EBI Chip Select.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	cs	ChipSelect lines to reconfigure, mask of EBI_CS<n> flags.
bool	[in]	enable	True to enable, false to disable.

EBI_ReadTimingSet#

void EBI_ReadTimingSet (uint32_t setupCycles, uint32_t strobeCycles, uint32_t holdCycles)

Configure timing values of read bus accesses.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	setupCycles	A number of clock cycles for the address setup before REn is asserted.
uint32_t	[in]	strobeCycles	The number of cycles the REn is held active. After the specified number of cycles, data is read. If set to 0, 1 cycle is inserted by hardware.
uint32_t	[in]	holdCycles	The number of cycles CSn is held active after the REn is deasserted.

EBI_WriteTimingSet#

void EBI_WriteTimingSet (uint32_t setupCycles, uint32_t strobeCycles, uint32_t holdCycles)

Configure timing values of write bus accesses.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	setupCycles	A number of clock cycles for the address setup before WEn is asserted.
uint32_t	[in]	strobeCycles	A number of cycles WEn is held active. If set to 0, 1 cycle is inserted by hardware.
uint32_t	[in]	holdCycles	A number of cycles CSn is held active after the WEn is deasserted.

EBI_AddressTimingSet#

void EBI_AddressTimingSet (uint32_t setupCycles, uint32_t holdCycles)

Configure timing values of address latch bus accesses.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	setupCycles	Sets the number of cycles the address is held after ALE is asserted.
uint32_t	[in]	holdCycles	Sets the number of cycles the address is driven onto the ADDRDAT bus before ALE is asserted. If set 0, 1 cycle is inserted by hardware.

EBI_PolaritySet#

void EBI_PolaritySet (EBI_Line_TypeDef line, EBI_Polarity_TypeDef polarity)

Configure EBI pin polarity.

Parameters

Type	Direction	Argument Name	Description
EBI_Line_TypeDef	[in]	line	Which pin/line to configure.
EBI_Polarity_TypeDef	[in]	polarity	Active high or active low.