Diff: source/I2CCommonMbedHardwareLib.cpp

Revision:

0:38c206f19bb7

Child:

1:4d6dc19a2347

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/I2CCommonMbedHardwareLib.cpp	Mon Apr 11 08:26:39 2016 +0000
@@ -0,0 +1,76 @@
+/*   Copyright 2016 Rohm Semiconductor
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+#include "../rohm-sensor-hal/rohm_hal.h"           //types, USE_MBED_HARDWARE_I2C, DEBUG_print*, I2C_SDA, I2C_SCL
+#ifdef USE_MBED_HARDWARE_I2C
+#include "../rohm-sensor-hal/I2CCommon.h"          //prototypes
+#include "I2C.h"                //I2C
+#define I2C_WRITE 0
+#define I2C_READ  1
+I2C i2c(I2C_SDA, I2C_SCL);
+
+
+//Note that I2CCommonBegin() must be called before using read/write functions.
+bool I2CCommonBegin(){
+    return( true );        //always succeeds
+}
+
+/* i2c common functions */
+uint8_t read_register(uint8_t sad, uint8_t reg, uint8_t* buf, uint8_t buf_len) {
+    uint8_t received_bytes;
+    int read_ok;
+
+    i2c.write( (int)((sad << 1) | I2C_WRITE), (char*)&reg, (int)1 );
+    read_ok = i2c.read( (int)((sad << 1) | I2C_READ), (char*)buf, (int)buf_len);
+
+    if( read_ok == 0 ){     //0 == success(ack)
+        received_bytes = buf_len;
+        }
+    else{                   //non0 == fail (nack)
+        received_bytes = 0;
+        }
+    return( received_bytes );
+}
+
+void write_registers(uint8_t sad, uint8_t reg, uint8_t* data, uint8_t data_len) {
+    i2c.write( (int)((sad << 1) | I2C_WRITE ), (char*)&reg, (int)1, true);
+    i2c.write( (int)((sad << 1) | I2C_WRITE ), (char*)data, (int)data_len, false);
+}
+
+void write_register(uint8_t sad, uint8_t reg, uint8_t data) {
+    char data_to_send[2];
+
+    data_to_send[0] = reg;
+    data_to_send[1] = data;
+    i2c.write( (int)((sad << 1) | I2C_WRITE ), &data_to_send[0], 2);
+}
+
+bool change_bits(uint8_t sad, uint8_t reg, uint8_t mask, uint8_t bits){
+    uint8_t value, read_bytes;
+    read_bytes = read_register(sad, reg, &value, 1);
+    if( read_bytes != 0 ){
+        value = value & ~mask;
+        value = value | (bits & mask);
+        write_register(sad, reg, value);
+        return true;
+        }
+    else{
+        //DEBUG_printf("Read before change_bits() failed.");
+        return false;
+        }
+}
+
+#endif
+
+