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Diff: source/I2CCommonMbedHardwareLib.cpp
- Revision:
- 0:38c206f19bb7
- Child:
- 1:4d6dc19a2347
- Child:
- 10:37b8f497b698
--- /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*)®, (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*)®, (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 + +