spibus_npl.c File Reference

#include <cfg/spi.h>
#include <sys/timer.h>
#include <sys/nutdebug.h>
#include <stdlib.h>
#include <memdebug.h>
#include <errno.h>
#include <dev/cy2239x.h>
#include <dev/npl.h>
#include <dev/spibus_npl.h>

Include dependency graph for spibus_npl.c:

Defines
#define	NPL_MMC_CLOCK   12500000
Functions
int	NplSpiBusSelect (NUTSPINODE *node, uint32_t tmo)
	Select a device on the first SPI bus.
int	NplSpiBusDeselect (NUTSPINODE *node)
	Deselect a device on the first SPI bus.
int	NplSpiBusNodeInit (NUTSPINODE *node)
	Initialize an SPI bus node.
int	NplSpiBusPollTransfer (NUTSPINODE *node, const void *txbuf, void *rxbuf, int xlen)
	Transfer data on the SPI bus in polling mode.
Variables
NUTSPIBUS	spiBusNpl
	SPI bus driver implementation structure.

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Define Documentation

#define NPL_MMC_CLOCK   12500000

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Function Documentation

int NplSpiBusSelect	(	NUTSPINODE *	node,
		uint32_t	tmo
	)

Select a device on the first SPI bus.

Locks and activates the bus for the specified node.

Parameters:

node	Specifies the SPI bus node.
tmo	Timeout in milliseconds. To disable timeout, set this parameter to NUT_WAIT_INFINITE.

Returns:

0 on success. In case of an error, -1 is returned and the bus is not locked.

References _NUTSPIBUS::bus_mutex, EIO, errno, _NUTSPINODE::node_bus, _NUTSPINODE::node_cs, _NUTSPINODE::node_mode, NULL, NUTASSERT, NutEventPost(), NutEventWait(), rc, and SPI_MODE_UPDATE.

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int NplSpiBusDeselect

(

NUTSPINODE *

node

)

Deselect a device on the first SPI bus.

Deactivates the chip select and unlocks the bus.

Parameters:

node	Specifies the SPI bus node.

Returns:

Always 0.

References _NUTSPIBUS::bus_mutex, _NUTSPINODE::node_bus, _NUTSPINODE::node_cs, NULL, NUTASSERT, and NutEventPost().

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int NplSpiBusNodeInit

(

NUTSPINODE *

node

)

Initialize an SPI bus node.

This routine is called for each SPI node, which is registered via NutRegisterSpiDevice().

Parameters:

node	Specifies the SPI bus node.

Returns:

0 on success or -1 if there is no valid chip select.

References _NUTSPINODE::node_cs, NULL, NUTASSERT, and rc.

int NplSpiBusPollTransfer	(	NUTSPINODE *	node,
		const void *	txbuf,
		void *	rxbuf,
		int	xlen
	)

Transfer data on the SPI bus in polling mode.

A device must have been selected by calling NplSpiSelect().

Parameters:

node	Specifies the SPI bus node.
txbuf	Pointer to the transmit buffer. If NULL, undetermined byte values are transmitted.
rxbuf	Pointer to the receive buffer. If NULL, then incoming data is discarded.
xlen	Number of bytes to transfer.

Returns:

Always 0.

References inb, NPL_MMCDR, NPL_MMCREADY, NPL_SLR, NULL, NUTASSERT, and outb.

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Variable Documentation

NUTSPIBUS spiBusNpl

Initial value:

 {
    NULL,                   
    NULL,                   
    0,                      
    NULL,                   
    NplSpiBusNodeInit,      
    NplSpiBusSelect,        
    NplSpiBusDeselect,      
    NplSpiBusPollTransfer,  
    NutSpiBusWait,          
    NutSpiBusSetMode,       
    NutSpiBusSetRate,       
    NutSpiBusSetBits        
}

SPI bus driver implementation structure.