spibus0gpio.c File Reference

#include <cfg/spi.h>
#include <cfg/arch/gpio.h>
#include <dev/gpio.h>
#include <dev/spibus_gpio.h>
#include <sys/event.h>
#include <sys/timer.h>
#include <sys/nutdebug.h>
#include <dev/board.h>
#include <errno.h>
#include <stdlib.h>

Include dependency graph for spibus0gpio.c:

Functions
int	GpioSpiBus0Transfer (NUTSPINODE *node, const void *txbuf, void *rxbuf, int xlen)
	Transfer data on the SPI bus.
int	GpioSpiBus0NodeInit (NUTSPINODE *node)
	Initialize an SPI bus node.
int	GpioSpiBus0Select (NUTSPINODE *node, uint32_t tmo)
	Select a device on the SPI bus.
int	GpioSpiBus0Deselect (NUTSPINODE *node)
	Deselect a device on the SPI bus.
Variables
NUTSPIBUS	spiBus0Gpio
	AVR SPI bus driver implementation structure.

---

Function Documentation

int GpioSpiBus0Transfer	(	NUTSPINODE *	node,
		const void *	txbuf,
		void *	rxbuf,
		int	xlen
	)

Transfer data on the SPI bus.

A device must have been selected by calling GpioSpi0Select().

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 _NUTSPINODE::node_mode, _NUTSPINODE::node_stat, NULL, NUTASSERT, SPI_MODE_0, SPI_MODE_1, SPI_MODE_2, and SPI_MODE_3.

int GpioSpiBus0NodeInit

(

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 GpioSpiSetup(), _NUTSPINODE::node_cs, _NUTSPINODE::node_mode, _NUTSPINODE::node_stat, NULL, NUTASSERT, and SPI_MODE_CSHIGH.

Here is the call graph for this function:

int GpioSpiBus0Select	(	NUTSPINODE *	node,
		uint32_t	tmo
	)

Select a device on the 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, GPIO_CFG_OUTPUT, GpioPinConfigSet(), GpioPinSetLow, GpioSpiSetup(), _NUTSPINODE::node_bus, _NUTSPINODE::node_cs, _NUTSPINODE::node_mode, _NUTSPINODE::node_stat, NULL, NUTASSERT, NutEventPost(), NutEventWait(), rc, SBBI0_MISO_BIT, SBBI0_MISO_PORT, SBBI0_MOSI_BIT, SBBI0_MOSI_PORT, SBBI0_SCK_BIT, SBBI0_SCK_PORT, SPI_MODE_CPOL, SPI_MODE_CSHIGH, and SPI_MODE_UPDATE.

Here is the call graph for this function:

int GpioSpiBus0Deselect

(

NUTSPINODE *

node

)

Deselect a device on the 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, _NUTSPINODE::node_mode, NULL, NUTASSERT, NutEventPost(), and SPI_MODE_CSHIGH.

Here is the call graph for this function:

---

Variable Documentation

NUTSPIBUS spiBus0Gpio

Initial value:

 {
    NULL,                       
    NULL,                       
    0,                          
    NULL,                       
    GpioSpiBus0NodeInit,        
    GpioSpiBus0Select,          
    GpioSpiBus0Deselect,        
    GpioSpiBus0Transfer,        
    NutSpiBusWait,              
    NutSpiBusSetMode,           
    GpioSpiBusSetRate,          
    NutSpiBusSetBits            
}

AVR SPI bus driver implementation structure.