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I2C Class Reference
An I2C Master, used for communicating with I2C slave devices. More...
#include <I2C.h>
Inherits mbed::Base.
Public Member Functions | |
I2C (PinName sda, PinName scl, const char *name=NULL) | |
Create an I2C Master interface, connected to the specified pins. | |
void | frequency (int hz) |
Set the frequency of the I2C interface. | |
int | read (int address, char *data, int length, bool repeated=false) |
Read from an I2C slave. | |
int | read (int ack) |
Read a single byte from the I2C bus. | |
int | write (int address, const char *data, int length, bool repeated=false) |
Write to an I2C slave. | |
int | write (int data) |
Write single byte out on the I2C bus. | |
void | start (void) |
Creates a start condition on the I2C bus. | |
void | stop (void) |
Creates a stop condition on the I2C bus. | |
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
An I2C Master, used for communicating with I2C slave devices.
Example:
// Read from I2C slave at address 0x62 #include "mbed.h" I2C i2c(p28, p27); int main() { int address = 0x62; char data[2]; i2c.read(address, data, 2); }
Definition at line 36 of file I2C.h.
Constructor & Destructor Documentation
I2C | ( | PinName | sda, |
PinName | scl, | ||
const char * | name = NULL |
||
) |
Member Function Documentation
static void add_rpc_class | ( | ) | [static, inherited] |
void frequency | ( | int | hz ) |
Set the frequency of the I2C interface.
- Parameters:
-
hz The bus frequency in hertz
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:
-
name the name to lookup. len the 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 | ( | int | address, |
char * | data, | ||
int | length, | ||
bool | repeated = false |
||
) |
Read from an I2C slave.
Performs a complete read transaction. The bottom bit of the address is forced to 1 to indicate a read.
- Parameters:
-
address 8-bit I2C slave address [ addr | 1 ] data Pointer to the byte-array to read data in to length Number of bytes to read repeated Repeated start, true - don't send stop at end
- Returns:
- 0 on success (ack), non-0 on failure (nack)
int read | ( | int | ack ) |
Read a single byte from the I2C bus.
- Parameters:
-
ack indicates if the byte is to be acknowledged (1 = acknowledge)
- Returns:
- the byte read
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:
-
name The name to give the object. If NULL we do nothing.
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:
-
method The name of the method to call. arguments A list of arguments separated by spaces. result A 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.
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.
void start | ( | void | ) |
Creates a start condition on the I2C bus.
void stop | ( | void | ) |
Creates a stop condition on the I2C bus.
int write | ( | int | address, |
const char * | data, | ||
int | length, | ||
bool | repeated = false |
||
) |
Write to an I2C slave.
Performs a complete write transaction. The bottom bit of the address is forced to 0 to indicate a write.
- Parameters:
-
address 8-bit I2C slave address [ addr | 0 ] data Pointer to the byte-array data to send length Number of bytes to send repeated Repeated start, true - do not send stop at end
- Returns:
- 0 on success (ack), non-0 on failure (nack)
int write | ( | int | data ) |
Write single byte out on the I2C bus.
- Parameters:
-
data data to write out on bus
- Returns:
- '1' if an ACK was received, '0' otherwise
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