Rohm / rohm-bh1726

Rohm BH1726 ALS sensor driver.

Dependents:   rohm-bh1726-hello rohm-tileshield-6sensor-demo

Fork of rohm-bh1745 by Rohm

source/bh1726_driver.cpp@2:40307a303153, 2016-09-14 (annotated)

Committer:
MikkoZ
Date:
Wed Sep 14 07:14:36 2016 +0000
Revision:
2:40307a303153
Parent:
source/bh1745_driver.cpp@1:64629eee9eab
Child:
3:6eb91c7c6560
Rohm BH1726 dual channel ALS sensor driver for 400-700nm wavelength.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikkoZ 0:0bcc203c5c75 1 /* Copyright 2016 Rohm Semiconductor
MikkoZ 0:0bcc203c5c75 2
MikkoZ 0:0bcc203c5c75 3 Licensed under the Apache License, Version 2.0 (the "License");
MikkoZ 0:0bcc203c5c75 4 you may not use this file except in compliance with the License.
MikkoZ 0:0bcc203c5c75 5 You may obtain a copy of the License at
MikkoZ 0:0bcc203c5c75 6
MikkoZ 0:0bcc203c5c75 7 http://www.apache.org/licenses/LICENSE-2.0
MikkoZ 0:0bcc203c5c75 8
MikkoZ 0:0bcc203c5c75 9 Unless required by applicable law or agreed to in writing, software
MikkoZ 0:0bcc203c5c75 10 distributed under the License is distributed on an "AS IS" BASIS,
MikkoZ 0:0bcc203c5c75 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MikkoZ 0:0bcc203c5c75 12 See the License for the specific language governing permissions and
MikkoZ 0:0bcc203c5c75 13 limitations under the License.
MikkoZ 0:0bcc203c5c75 14 */
MikkoZ 0:0bcc203c5c75 15 #include "../../rohm-sensor-hal/rohm-sensor-hal/rohm_hal.h" //types, DEBUG_print*
MikkoZ 0:0bcc203c5c75 16 #include "../../rohm-sensor-hal/rohm-sensor-hal/I2CCommon.h" //read_register, write_register, change_bits
MikkoZ 0:0bcc203c5c75 17
MikkoZ 2:40307a303153 18 #include "../rohm-bh1726/bh1726.h" //bh1726_* register definitions
MikkoZ 2:40307a303153 19 #include "../rohm-bh1726/bh1726_driver.h"
MikkoZ 1:64629eee9eab 20 //Choose SAD according to setup
MikkoZ 2:40307a303153 21 //#define SAD 0x29
MikkoZ 1:64629eee9eab 22 #define SAD 0x39
MikkoZ 0:0bcc203c5c75 23
MikkoZ 2:40307a303153 24 /* bh1726 driver*/
MikkoZ 2:40307a303153 25 uint8_t bh1726_readId(){
MikkoZ 2:40307a303153 26 uint8_t partid;
MikkoZ 1:64629eee9eab 27 uint8_t read_bytes;
MikkoZ 0:0bcc203c5c75 28
MikkoZ 2:40307a303153 29 read_bytes = read_register(SAD, BH1726_ID, &partid, 1);
MikkoZ 1:64629eee9eab 30 if ( read_bytes > 0 ){
MikkoZ 2:40307a303153 31 DEBUG_printf("Part ID: %u\n\r", partid);
MikkoZ 1:64629eee9eab 32 return(partid);
MikkoZ 1:64629eee9eab 33 }
MikkoZ 2:40307a303153 34 else{
MikkoZ 2:40307a303153 35 DEBUG_print("Part ID read failed.\n\r");
MikkoZ 2:40307a303153 36 return 255;
MikkoZ 1:64629eee9eab 37 }
MikkoZ 0:0bcc203c5c75 38 }
MikkoZ 0:0bcc203c5c75 39
MikkoZ 2:40307a303153 40 void bh1726_dumpregs(uint8_t dumpstart, uint8_t dumpend){
MikkoZ 2:40307a303153 41 uint8_t i;
MikkoZ 2:40307a303153 42 uint8_t value;
MikkoZ 2:40307a303153 43 uint8_t read_bytes;
MikkoZ 2:40307a303153 44
MikkoZ 2:40307a303153 45 for(i = dumpstart;i < dumpend;i++){
MikkoZ 2:40307a303153 46 read_bytes = read_register(SAD, i, &value, 1);
MikkoZ 2:40307a303153 47 if ( read_bytes > 0 ){
MikkoZ 2:40307a303153 48 DEBUG_printf("Register [%3u]=[%3u]\n\r", i, value);
MikkoZ 2:40307a303153 49 }
MikkoZ 2:40307a303153 50 }
MikkoZ 2:40307a303153 51 return;
MikkoZ 2:40307a303153 52 }
MikkoZ 2:40307a303153 53
MikkoZ 2:40307a303153 54 void bh1726_wait_until_found(){
MikkoZ 0:0bcc203c5c75 55 uint8_t id;
MikkoZ 0:0bcc203c5c75 56
MikkoZ 2:40307a303153 57 DEBUG_printf("Hoping to find part ID: %u\n\r", BH1726_ID_NUMBER_FOR_PART);
MikkoZ 2:40307a303153 58 id = bh1726_readId();
MikkoZ 2:40307a303153 59 while (id != BH1726_ID_NUMBER_FOR_PART){
MikkoZ 2:40307a303153 60 wait_ms(100);
MikkoZ 2:40307a303153 61 id = bh1726_readId();
MikkoZ 0:0bcc203c5c75 62 }
MikkoZ 0:0bcc203c5c75 63 return;
MikkoZ 0:0bcc203c5c75 64 }
MikkoZ 0:0bcc203c5c75 65
MikkoZ 2:40307a303153 66 void bh1726_soft_reset(){
MikkoZ 2:40307a303153 67 write_register(SAD, BH1726_SOFTWARE_RESET, 0);
MikkoZ 0:0bcc203c5c75 68 }
MikkoZ 0:0bcc203c5c75 69
MikkoZ 2:40307a303153 70 void bh1726_clear_interrupt(){
MikkoZ 2:40307a303153 71 write_register(SAD, BH1726_INTERRUPT_OUTPUT_RESET, 0);
MikkoZ 0:0bcc203c5c75 72 }
MikkoZ 0:0bcc203c5c75 73
MikkoZ 2:40307a303153 74 void bh1726_initial_setup(){
MikkoZ 2:40307a303153 75 write_register(SAD, BH1726_TIMING,
MikkoZ 2:40307a303153 76 (BH1726_TIMING_ITIME_38CYCLE) //105ms measurement time
MikkoZ 2:40307a303153 77 );
MikkoZ 2:40307a303153 78 write_register(SAD, BH1726_INTERRUPT,
MikkoZ 2:40307a303153 79 (BH1726_INTERRUPT_INT_LATCH_YES |
MikkoZ 2:40307a303153 80 BH1726_INTERRUPT_INT_EN_FALSE |
MikkoZ 2:40307a303153 81 BH1726_INTERRUPT_PERSIST_DRDY)
MikkoZ 0:0bcc203c5c75 82 );
MikkoZ 2:40307a303153 83 write_register(SAD, BH1726_GAIN,
MikkoZ 2:40307a303153 84 (BH1726_GAIN_GAIN0_X1 |
MikkoZ 2:40307a303153 85 BH1726_GAIN_GAIN1_X1)
MikkoZ 0:0bcc203c5c75 86 );
MikkoZ 2:40307a303153 87 write_register(SAD, BH1726_WAIT,
MikkoZ 2:40307a303153 88 (BH1726_WAIT_WAIT_NO)
MikkoZ 1:64629eee9eab 89 );
MikkoZ 2:40307a303153 90 write_register(SAD, BH1726_CONTROL,
MikkoZ 2:40307a303153 91 (BH1726_CONTROL_ADC_EN_TRUE |
MikkoZ 2:40307a303153 92 BH1726_CONTROL_POWER_ON)
MikkoZ 0:0bcc203c5c75 93 );
MikkoZ 0:0bcc203c5c75 94 }
MikkoZ 0:0bcc203c5c75 95
MikkoZ 1:64629eee9eab 96 /* input param: data16, pointer to 4*16bit memory
MikkoZ 0:0bcc203c5c75 97 return: error, true/false */
MikkoZ 2:40307a303153 98 bool bh1726_read_data(uint16_t* data16){
MikkoZ 2:40307a303153 99 #define BH1726_DATA_LEN 4
MikkoZ 2:40307a303153 100 uint8_t data[BH1726_DATA_LEN];
MikkoZ 0:0bcc203c5c75 101 uint8_t read_bytes;
MikkoZ 0:0bcc203c5c75 102
MikkoZ 2:40307a303153 103 read_bytes = read_register(SAD, BH1726_DATA0_LSBS, &data[0], BH1726_DATA_LEN);
MikkoZ 2:40307a303153 104 if (read_bytes == BH1726_DATA_LEN){
MikkoZ 2:40307a303153 105 data16[0] = (data[0]) | (data[1] << 8); //data0
MikkoZ 2:40307a303153 106 data16[1] = (data[2]) | (data[3] << 8); //data1
MikkoZ 0:0bcc203c5c75 107 return false;
MikkoZ 0:0bcc203c5c75 108 }
MikkoZ 0:0bcc203c5c75 109 else{
MikkoZ 0:0bcc203c5c75 110 DEBUG_printf("Read error. Read %d bytes\n\r", read_bytes);
MikkoZ 0:0bcc203c5c75 111 return true;
MikkoZ 0:0bcc203c5c75 112 }
MikkoZ 0:0bcc203c5c75 113
MikkoZ 0:0bcc203c5c75 114 }