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SPISlave Class Reference
Public Member Functions | Static Public Member Functions

SPISlave Class Reference

A SPI slave, used for communicating with a SPI Master device. More...

#include <SPISlave.h>

Inherits mbed::Base.

Public Member Functions

 SPISlave (PinName mosi, PinName miso, PinName sclk, PinName ssel, const char *name=NULL)
 Create a SPI slave connected to the specified pins.
void format (int bits, int mode=0)
 Configure the data transmission format.
void frequency (int hz=1000000)
 Set the spi bus clock frequency.
int receive (void)
 Polls the SPI to see if data has been received.
int read (void)
 Retrieve data from receive buffer as slave.
void reply (int value)
 Fill the transmission buffer with the value to be written out as slave on the next received message from the master.
void register_object (const char *name)
 Registers this object with the given name, so that it can be looked up with lookup.
const char * name ()
 Returns the name of the object.
virtual bool rpc (const char *method, const char *arguments, char *result)
 Call the given method with the given arguments, and write the result into the string pointed to by result.
virtual struct rpc_method * get_rpc_methods ()
 Returns a pointer to an array describing the rpc methods supported by this object, terminated by either RPC_METHOD_END or RPC_METHOD_SUPER(Superclass).

Static Public Member Functions

static bool rpc (const char *name, const char *method, const char *arguments, char *result)
 Use the lookup function to lookup an object and, if successful, call its rpc method.
static Base * lookup (const char *name, unsigned int len)
 Lookup and return the object that has the given name.
template<class C >
static void add_rpc_class ()
 Add the class to the list of classes which can have static methods called via rpc (the static methods which can be called are defined by that class' get_rpc_class() static method).

Detailed Description

A SPI slave, used for communicating with a SPI Master device.

The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz

Example: 

 // Reply to a SPI master as slave

 #include "mbed.h"

 SPISlave device(p5, p6, p7, p8); // mosi, miso, sclk, ssel

 int main() {
     device.reply(0x00);              // Prime SPI with first reply
     while(1) {
         if(device.receive()) {
             int v = device.read();   // Read byte from master
             v = (v + 1) % 0x100;     // Add one to it, modulo 256
             device.reply(v);         // Make this the next reply
         }
     }
 }

Definition at line 43 of file SPISlave.h.

Constructor & Destructor Documentation

SPISlave ( PinName  mosi,
PinName  miso,
PinName  sclk,
PinName  ssel,
const char *  name = NULL 
)

Create a SPI slave connected to the specified pins.

Pin Options: (5, 6, 7i, 8) or (11, 12, 13, 14)

mosi or miso can be specfied as NC if not used

Parameters:
mosiSPI Master Out, Slave In pin
misoSPI Master In, Slave Out pin
sclkSPI Clock pin
sselSPI chip select pin
name(optional) A string to identify the object

Member Function Documentation

static void add_rpc_class (  ) [static, inherited]

Add the class to the list of classes which can have static methods called via rpc (the static methods which can be called are defined by that class' get_rpc_class() static method).

Definition at line 143 of file Base.h.

void format ( int  bits,
int  mode = 0 
)

Configure the data transmission format.

Parameters:
bitsNumber of bits per SPI frame (4 - 16)
modeClock polarity and phase mode (0 - 3)
 mode | POL PHA 
 -----+--------     
   0  |  0   0 
   1  |  0   1
   2  |  1   0 
   3  |  1   1
void frequency ( int  hz = 1000000 )

Set the spi bus clock frequency.

Parameters:
hzSCLK frequency in hz (default = 1MHz)
virtual struct rpc_method* get_rpc_methods (  ) [read, virtual, inherited]

Returns a pointer to an array describing the rpc methods supported by this object, terminated by either RPC_METHOD_END or RPC_METHOD_SUPER(Superclass).

Example 

 class Example : public Base {
     int foo(int a, int b) { return a + b; }
     virtual const struct rpc_method *get_rpc_methods() {
         static const rpc_method rpc_methods[] = {
             { "foo", generic_caller<int, Example, int, int, &Example::foo> },
             RPC_METHOD_SUPER(Base)
         };
         return rpc_methods;
     }
 };

Reimplemented in AnalogIn, AnalogOut, BusIn, BusInOut, BusOut, DigitalIn, DigitalInOut, DigitalOut, PwmOut, Serial, SPI, and Timer.

static Base* lookup ( const char *  name,
unsigned int  len 
) [static, inherited]

Lookup and return the object that has the given name.

Parameters:
namethe name to lookup.
lenthe length of name.
const char* name (  ) [inherited]

Returns the name of the object.

Returns:
The name of the object, or NULL if it has no name.
int read ( void   )

Retrieve data from receive buffer as slave.

Returns:
the data in the receive buffer
int receive ( void   )

Polls the SPI to see if data has been received.

Returns:
0 if no data, 1 otherwise
void register_object ( const char *  name ) [inherited]

Registers this object with the given name, so that it can be looked up with lookup.

If this object has already been registered, then this just changes the name.

Parameters:
nameThe name to give the object. If NULL we do nothing.
void reply ( int  value )

Fill the transmission buffer with the value to be written out as slave on the next received message from the master.

Parameters:
valuethe data to be transmitted next
static bool rpc ( const char *  name,
const char *  method,
const char *  arguments,
char *  result 
) [static, inherited]

Use the lookup function to lookup an object and, if successful, call its rpc method.

Returns:
false if name does not correspond to an object, otherwise the return value of the call to the object's rpc method.
virtual bool rpc ( const char *  method,
const char *  arguments,
char *  result 
) [virtual, inherited]

Call the given method with the given arguments, and write the result into the string pointed to by result.

The default implementation calls rpc_methods to determine the supported methods.

Parameters:
methodThe name of the method to call.
argumentsA list of arguments separated by spaces.
resultA pointer to a string to write the result into. May be NULL, in which case nothing is written.
Returns:
true if method corresponds to a valid rpc method, or false otherwise.
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