MSS / Mbed 2 deprecated testI2C

Simple I2C test program. open/close/read/write supported.

Dependencies:   mbed vt100

dumb_i2c.cpp@2:218e22a54982, 2016-04-05 (annotated)

Committer:
Rhyme
Date:
Tue Apr 05 06:53:27 2016 +0000
Revision:
2:218e22a54982
Parent:
1:e105ceaee6ac 
condition check for read/write and bus scan added;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Rhyme 0:1a2637f8e2dd 1 #include "mbed.h"
Rhyme 0:1a2637f8e2dd 2 #include "dumb_i2c.h"
Rhyme 0:1a2637f8e2dd 3
Rhyme 0:1a2637f8e2dd 4 DUMB_I2C::DUMB_I2C(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr<<1) {
Rhyme 0:1a2637f8e2dd 5 // activate the peripheral
Rhyme 1:e105ceaee6ac 6 freq = 100000 ; /* 100KHz */
Rhyme 1:e105ceaee6ac 7 m_i2c.frequency(freq) ;
Rhyme 0:1a2637f8e2dd 8 }
Rhyme 0:1a2637f8e2dd 9
Rhyme 0:1a2637f8e2dd 10 DUMB_I2C::~DUMB_I2C() { }
Rhyme 0:1a2637f8e2dd 11
Rhyme 0:1a2637f8e2dd 12 uint8_t DUMB_I2C::address(void)
Rhyme 0:1a2637f8e2dd 13 {
Rhyme 0:1a2637f8e2dd 14 return( m_addr >> 1 ) ;
Rhyme 0:1a2637f8e2dd 15 }
Rhyme 0:1a2637f8e2dd 16
Rhyme 1:e105ceaee6ac 17 void DUMB_I2C::frequency(uint32_t f)
Rhyme 1:e105ceaee6ac 18 {
Rhyme 1:e105ceaee6ac 19 freq = f ;
Rhyme 1:e105ceaee6ac 20 m_i2c.frequency(freq) ;
Rhyme 1:e105ceaee6ac 21 }
Rhyme 1:e105ceaee6ac 22
Rhyme 1:e105ceaee6ac 23 uint32_t DUMB_I2C::frequency(void)
Rhyme 1:e105ceaee6ac 24 {
Rhyme 1:e105ceaee6ac 25 return(freq) ;
Rhyme 1:e105ceaee6ac 26 }
Rhyme 1:e105ceaee6ac 27
Rhyme 2:218e22a54982 28 int DUMB_I2C::read(int addr, uint8_t *data, int len)
Rhyme 0:1a2637f8e2dd 29 {
Rhyme 2:218e22a54982 30 int result ;
Rhyme 2:218e22a54982 31 result = readRegs(addr, data, len) ;
Rhyme 2:218e22a54982 32 return( result ) ;
Rhyme 0:1a2637f8e2dd 33 }
Rhyme 0:1a2637f8e2dd 34
Rhyme 2:218e22a54982 35 int DUMB_I2C::write(int addr, uint8_t *data, int len)
Rhyme 0:1a2637f8e2dd 36 {
Rhyme 0:1a2637f8e2dd 37 uint8_t *buf ;
Rhyme 2:218e22a54982 38 int ack ;
Rhyme 0:1a2637f8e2dd 39 buf = new uint8_t[len+1] ;
Rhyme 0:1a2637f8e2dd 40 buf[0] = addr ;
Rhyme 0:1a2637f8e2dd 41 for (int i = 0 ; i < len ; i++ ) {
Rhyme 0:1a2637f8e2dd 42 buf[i+1] = data[i] ;
Rhyme 0:1a2637f8e2dd 43 }
Rhyme 2:218e22a54982 44 ack = writeRegs(buf, len+1) ;
Rhyme 0:1a2637f8e2dd 45 delete buf ;
Rhyme 2:218e22a54982 46 return( ack ) ;
Rhyme 0:1a2637f8e2dd 47 }
Rhyme 0:1a2637f8e2dd 48
Rhyme 2:218e22a54982 49 int DUMB_I2C::readRegs(int addr, uint8_t * data, int len) {
Rhyme 2:218e22a54982 50 int result ;
Rhyme 0:1a2637f8e2dd 51 char t[1] = {addr};
Rhyme 0:1a2637f8e2dd 52 m_i2c.write(m_addr, t, 1, true);
Rhyme 2:218e22a54982 53 result = m_i2c.read(m_addr, (char *)data, len);
Rhyme 2:218e22a54982 54 return( result ) ;
Rhyme 0:1a2637f8e2dd 55 }
Rhyme 0:1a2637f8e2dd 56
Rhyme 2:218e22a54982 57 int DUMB_I2C::writeRegs(uint8_t * data, int len) {
Rhyme 2:218e22a54982 58 int ack ;
Rhyme 2:218e22a54982 59 ack = m_i2c.write(m_addr, (char *)data, len);
Rhyme 2:218e22a54982 60 return( ack ) ;
Rhyme 0:1a2637f8e2dd 61 }