FLEXBUS Peripheral Driver

Overview

The section describes the programming interface of the FLEXBUS Peripheral driver. The FLEXBUS driver provides an easy way to initialize and configure the FLEXBUS.

FLEXBUS Overview

The FLEXBUS (external bus interface) is a hardware module that provides memory expansion and a connection to external peripheral with a parallel bus. It can be directly connected to the slave-only devices such as:

• External ROMs
• Flash memories
• Programmable logic devices
• Other simple target (slave) devices

FLEXBUS Initialization

To initialize the FLEXBUS module, call the FLEXBUS_DRV_Init() function and pass in the instance number and the user configuration structure. This function automatically enables the FLEXBUS module and clock.
This example code shows how to initialize and configure the FLEXBUS for MRAM purpose:

/* Define configuration.
flexbus_user_config_t fb_config;
/* Clear user configuration struct first.
memset(&fb_config, 0x0, sizeof(flexbus_user_config_t));
fb_config.chip = 0;
fb_config.baseAddress = 0x60000000; /* Configure base address.
fb_config.portSize = kFlexbus1byte; /* Port size of transfer.
fb_config.autoAcknowledge = true;   /* Enable auto acknowledge.
fb_config.waitStates = 0x2;         /* Set wait state.
fb_config.baseAddressMask = 0x7;    /* Configure base address mask.

/* Initialize FLEXBUS.
FLEXBUS_DRV_Init(instance, &fb_config);

FLEXBUS De-initialize

To shut down the FLEXBUS module, call the FLEXBUS_DRV_Deinit() function and pass in the instance number.

FLEXBUS_DRV_Deinit(instance);

Functions
flexbus_status_t	FLEXBUS_DRV_Init (uint32_t instance, const flexbus_user_config_t *fb_config)
	Initializes the FlexBus driver. More...
flexbus_status_t	FLEXBUS_DRV_Deinit (uint32_t instance)
	Shuts down the FlexBus driver. More...

Variables
FB_Type *const	g_fbBase []
	Table of base addresses for FlexBus instances. More...

Function Documentation

flexbus_status_t FLEXBUS_DRV_Init	(	uint32_t	instance,
		const flexbus_user_config_t *	fb_config
	)

Parameters

instance	The FlexBus peripheral instance number.
fb_config	FlexBus input user configuration

Returns

Execution status.

flexbus_status_t FLEXBUS_DRV_Deinit

(

uint32_t

instance

)

Parameters

instance

The FlexBus peripheral instance number.

Returns

Execution status.

Variable Documentation

FB_Type* const g_fbBase[]