Diff: I2C_Driver.cpp

Revision:

0:2514f1c72462

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/I2C_Driver.cpp	Tue Aug 23 16:23:15 2016 +0000
@@ -0,0 +1,85 @@
+/*
+* Driver I2C para Proyecto - Pulsera Saturometrica.
+* Util para implementar rapidamente comunicacion simple I2C.
+* Basado en el driver I2C desarrollado por RedBearLab
+
+Copyright (c) 2012-2014 RedBearLab
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
+and associated documentation files (the "Software"), to deal in the Software without restriction, 
+including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
+subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
+FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+#include "I2C_Driver.h"
+#include "mbed.h"
+#include "wire.h"
+
+
+TwoWire Wire = TwoWire(NRF_TWI0);
+
+void ini_i2c( int scl, int sda){
+    Wire.begin(scl, sda, TWI_FREQUENCY_100K);
+}
+
+/*
+WriteByte( addr, *pbuf, length, dev_addr) : escritura i2c en la dirección i2c definida al inicio del programa.
+
+addr:  dirección del registro a ser escrito.
+*pbuf:    dirección (puntero) del array de datos a ser escritos. Dirección 0: LSB
+length:   cantidad de bytes a ser transmitidos.
+dev_addr: Direección física del dispositivo esclavo i2c
+
+*/
+
+int write_i2c(uint8_t addr, uint8_t *pbuf, uint16_t length, uint8_t dev_addr){ //Parámetros: addr: dirección de memoria; *pbuf: puntero de byte 0 del buffer; length: cantidad de bytes a enviar; dev_addr: Direección física del dispositivo esclavo i2c
+    int aux=0;
+    uint8_t aux2[length];
+    uint8_t *aux3;
+    for ( aux = 0; aux < length; aux++ ){
+        aux3 = pbuf+length-(aux+1);
+        aux2[aux]= *aux3;
+    }
+
+    Wire.beginTransmission(dev_addr);
+    Wire.write( (uint8_t)addr );
+    Wire.write(aux2, length);
+    return (Wire.endTransmission());
+}
+
+/*
+ReadByte( addr, *pbuf, length, dev_addr) : lectura i2c en la dirección i2c definida al inicio del programa.
+
+addr:  dirección del registro a ser escrito.
+*pbuf:    dirección (puntero) del array de datos a ser escritos. Dirección 0: LSB
+length:   cantidad de bytes a ser transmitidos.
+dev_addr: Direección física del dispositivo esclavo i2c
+
+*/
+
+int read_i2c(uint8_t addr, uint8_t *pbuf, uint16_t length, uint8_t dev_addr){ //Parámetros: addr: dirección de memoria; *pbuf: puntero de byte 0 del buffer; length: cantidad de bytes a enviar; dev_addr: Direección física del dispositivo esclavo i2c
+    int error=0;
+    
+    Wire.beginTransmission(dev_addr);
+    Wire.write( (uint8_t)addr );    
+    error = Wire.endTransmission();
+    
+    Wire.requestFrom(dev_addr+1, length);
+    
+    pbuf=pbuf+length-1;
+    while( Wire.available() > 0 )
+    {
+        *pbuf = Wire.read();
+        pbuf--;
+    }
+    return(error);
+}
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