Rohm / rohm-bh1745

Rohm BH1745 red-green-blue-clear -color sensor driver

Dependents:   rohm-bh1745-hello rohm-tileshield-6sensor-demo GR-PEACH_IoT_Platform_HTTP_sample

Fork of rohm-rpr0521 by Rohm

source/bh1745_driver.cpp@2:2b4a1b49998d, 2016-09-14 (annotated)

Committer:
MikkoZ
Date:
Wed Sep 14 07:04:40 2016 +0000
Revision:
2:2b4a1b49998d
Parent:
1:64629eee9eab 
Added stricter part id checks to prevent SAD collision go unnoticed. Same SADs are used in RPR0521(0x38) and BH1726(0x39).

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 1:64629eee9eab 18 #include "../rohm-bh1745/bh1745.h" //bh1745_* register definitions
MikkoZ 1:64629eee9eab 19 #include "../rohm-bh1745/bh1745_driver.h"
MikkoZ 1:64629eee9eab 20 //Choose SAD according to setup
MikkoZ 1:64629eee9eab 21 //#define SAD 0x38
MikkoZ 1:64629eee9eab 22 #define SAD 0x39
MikkoZ 0:0bcc203c5c75 23
MikkoZ 1:64629eee9eab 24 /* bh1745 driver*/
MikkoZ 1:64629eee9eab 25 uint8_t bh1745_readId(){
MikkoZ 1:64629eee9eab 26 uint8_t id;
MikkoZ 1:64629eee9eab 27 uint8_t read_bytes;
MikkoZ 0:0bcc203c5c75 28
MikkoZ 1:64629eee9eab 29 read_bytes = read_register(SAD, BH1745_ID_REG, &id, 1);
MikkoZ 1:64629eee9eab 30 if ( read_bytes > 0 ){
MikkoZ 1:64629eee9eab 31 uint8_t partid;
MikkoZ 1:64629eee9eab 32
MikkoZ 1:64629eee9eab 33 DEBUG_printf("Manufacturer: %u\n\r", id);
MikkoZ 2:2b4a1b49998d 34 if (id == 0xe0){
MikkoZ 2:2b4a1b49998d 35 read_bytes = read_register(SAD, BH1745_SYSTEM_CONTROL, &partid, 1);
MikkoZ 2:2b4a1b49998d 36 partid = partid & 0b00111111;
MikkoZ 2:2b4a1b49998d 37 if ( read_bytes > 0 ){
MikkoZ 2:2b4a1b49998d 38 DEBUG_printf("Part ID: %u\n\r", partid);
MikkoZ 2:2b4a1b49998d 39 if (partid == 0x0b){//OK
MikkoZ 2:2b4a1b49998d 40 return(partid);
MikkoZ 2:2b4a1b49998d 41 } else {
MikkoZ 2:2b4a1b49998d 42 DEBUG_print("Wrong part ID for this driver.\n\r");
MikkoZ 2:2b4a1b49998d 43 return 255;
MikkoZ 2:2b4a1b49998d 44 }
MikkoZ 2:2b4a1b49998d 45 } else {
MikkoZ 2:2b4a1b49998d 46 DEBUG_print("Part ID read failed.\n\r");
MikkoZ 2:2b4a1b49998d 47 return 255;
MikkoZ 2:2b4a1b49998d 48 }
MikkoZ 2:2b4a1b49998d 49 } else {
MikkoZ 2:2b4a1b49998d 50 DEBUG_print("Wrong manufacturer Id for this driver.\n\r");
MikkoZ 1:64629eee9eab 51 return 255;
MikkoZ 1:64629eee9eab 52 }
MikkoZ 2:2b4a1b49998d 53 } else {
MikkoZ 1:64629eee9eab 54 DEBUG_print("Manufacturer read failed.\n\r");
MikkoZ 1:64629eee9eab 55 return 255;
MikkoZ 0:0bcc203c5c75 56 }
MikkoZ 0:0bcc203c5c75 57 }
MikkoZ 0:0bcc203c5c75 58
MikkoZ 1:64629eee9eab 59 void bh1745_wait_until_found(){
MikkoZ 2:2b4a1b49998d 60 uint8_t id;
MikkoZ 0:0bcc203c5c75 61
MikkoZ 1:64629eee9eab 62 id = bh1745_readId();
MikkoZ 2:2b4a1b49998d 63 while (id == 255){
MikkoZ 2:2b4a1b49998d 64 wait(100);
MikkoZ 2:2b4a1b49998d 65 id = bh1745_readId();
MikkoZ 0:0bcc203c5c75 66 }
MikkoZ 2:2b4a1b49998d 67 return;
MikkoZ 2:2b4a1b49998d 68 }
MikkoZ 0:0bcc203c5c75 69
MikkoZ 1:64629eee9eab 70 void bh1745_soft_reset(){
MikkoZ 1:64629eee9eab 71 change_bits(SAD, BH1745_MODE_CONTROL1, BH1745_SYSTEM_CONTROL_SW_RESET_MASK, BH1745_SYSTEM_CONTROL_SW_RESET_START);
MikkoZ 0:0bcc203c5c75 72 }
MikkoZ 0:0bcc203c5c75 73
MikkoZ 1:64629eee9eab 74 void bh1745_clear_interrupt(){
MikkoZ 1:64629eee9eab 75 uint8_t tmp;
MikkoZ 1:64629eee9eab 76 read_register(SAD, BH1745_INTERRUPT, &tmp, 1);
MikkoZ 0:0bcc203c5c75 77 }
MikkoZ 0:0bcc203c5c75 78
MikkoZ 1:64629eee9eab 79 void bh1745_initial_setup(){
MikkoZ 1:64629eee9eab 80 write_register(SAD, BH1745_INTERRUPT,
MikkoZ 1:64629eee9eab 81 (BH1745_INTERRUPT_STATUS_INACTIVE |
MikkoZ 1:64629eee9eab 82 BH1745_INTERRUPT_LATCH_ENABLE |
MikkoZ 1:64629eee9eab 83 BH1745_INTERRUPT_PIN_DISABLE)
MikkoZ 0:0bcc203c5c75 84 );
MikkoZ 1:64629eee9eab 85 write_register(SAD, BH1745_PERSISTENCE,
MikkoZ 1:64629eee9eab 86 (BH1745_PERSISTENCE_OF_INTERRUPT_STATUS_TOGGLE_AFTER_MEASUREMENT)
MikkoZ 0:0bcc203c5c75 87 );
MikkoZ 1:64629eee9eab 88 write_register(SAD, BH1745_MODE_CONTROL1,
MikkoZ 1:64629eee9eab 89 (BH1745_MODE_CONTROL1_MEASUREMENT_TIME_160MSEC)
MikkoZ 1:64629eee9eab 90 );
MikkoZ 1:64629eee9eab 91 write_register(SAD, BH1745_MODE_CONTROL2,
MikkoZ 1:64629eee9eab 92 (BH1745_MODE_CONTROL2_RGBC_MEASUREMENT_ACTIVE |
MikkoZ 1:64629eee9eab 93 BH1745_MODE_CONTROL2_ADC_GAIN_1X)
MikkoZ 0:0bcc203c5c75 94 );
MikkoZ 0:0bcc203c5c75 95 }
MikkoZ 0:0bcc203c5c75 96
MikkoZ 1:64629eee9eab 97 /* input param: data16, pointer to 4*16bit memory
MikkoZ 0:0bcc203c5c75 98 return: error, true/false */
MikkoZ 1:64629eee9eab 99 bool bh1745_read_data(uint16_t* data16){
MikkoZ 1:64629eee9eab 100 #define BH1745_DATA_LEN 8
MikkoZ 1:64629eee9eab 101 uint8_t data[BH1745_DATA_LEN];
MikkoZ 0:0bcc203c5c75 102 uint8_t read_bytes;
MikkoZ 0:0bcc203c5c75 103
MikkoZ 1:64629eee9eab 104 read_bytes = read_register(SAD, BH1745_RED_DATA_LSBS, &data[0], BH1745_DATA_LEN);
MikkoZ 1:64629eee9eab 105 if (read_bytes == BH1745_DATA_LEN){
MikkoZ 1:64629eee9eab 106 data16[0] = (data[0]) | (data[1] << 8); //red
MikkoZ 1:64629eee9eab 107 data16[1] = (data[2]) | (data[3] << 8); //green
MikkoZ 1:64629eee9eab 108 data16[2] = (data[4]) | (data[5] << 8); //blue
MikkoZ 1:64629eee9eab 109 data16[3] = (data[6]) | (data[7] << 8); //clear
MikkoZ 0:0bcc203c5c75 110 return false;
MikkoZ 2:2b4a1b49998d 111 } else {
MikkoZ 0:0bcc203c5c75 112 DEBUG_printf("Read error. Read %d bytes\n\r", read_bytes);
MikkoZ 0:0bcc203c5c75 113 return true;
MikkoZ 2:2b4a1b49998d 114 }
MikkoZ 0:0bcc203c5c75 115
MikkoZ 2:2b4a1b49998d 116 }