Diff: source/bh1745_driver.cpp

Revision:

1:64629eee9eab

Parent:

0:0bcc203c5c75

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/bh1745_driver.cpp	Mon Sep 12 12:31:40 2016 +0000
@@ -0,0 +1,108 @@
+/*   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-sensor-hal/rohm_hal.h"         //types, DEBUG_print*
+#include "../../rohm-sensor-hal/rohm-sensor-hal/I2CCommon.h"        //read_register, write_register, change_bits
+
+#include "../rohm-bh1745/bh1745.h"      //bh1745_* register definitions
+#include "../rohm-bh1745/bh1745_driver.h"
+//Choose SAD according to setup
+//#define SAD  0x38
+#define SAD 0x39
+
+/* bh1745 driver*/
+uint8_t bh1745_readId(){
+    uint8_t id;
+    uint8_t read_bytes;
+
+    read_bytes = read_register(SAD, BH1745_ID_REG, &id, 1);
+    if ( read_bytes > 0 ){
+        uint8_t partid;
+        
+        DEBUG_printf("Manufacturer: %u\n\r", id);
+        read_bytes = read_register(SAD, BH1745_SYSTEM_CONTROL, &partid, 1);
+        if ( read_bytes > 0 ){
+            DEBUG_printf("Part ID: %u\n\r", (partid & 0b00111111) );
+        return(partid);
+        }
+        else{
+            DEBUG_print("Part ID read failed.\n\r");
+            return 255;
+        }
+    }
+    else{
+        DEBUG_print("Manufacturer read failed.\n\r");
+        return 255;
+    }
+}
+
+void bh1745_wait_until_found(){
+  uint8_t id;
+
+  id = bh1745_readId();
+  while (id == 255){
+    wait(100);
+    id = bh1745_readId();
+    }
+  return;
+  }
+
+void bh1745_soft_reset(){
+    change_bits(SAD, BH1745_MODE_CONTROL1, BH1745_SYSTEM_CONTROL_SW_RESET_MASK, BH1745_SYSTEM_CONTROL_SW_RESET_START);
+}
+
+void bh1745_clear_interrupt(){
+    uint8_t tmp;
+    read_register(SAD, BH1745_INTERRUPT, &tmp, 1);
+}
+
+void bh1745_initial_setup(){
+    write_register(SAD, BH1745_INTERRUPT,
+        (BH1745_INTERRUPT_STATUS_INACTIVE |
+        BH1745_INTERRUPT_LATCH_ENABLE |
+        BH1745_INTERRUPT_PIN_DISABLE)
+        );
+    write_register(SAD, BH1745_PERSISTENCE,
+        (BH1745_PERSISTENCE_OF_INTERRUPT_STATUS_TOGGLE_AFTER_MEASUREMENT)
+        );
+    write_register(SAD, BH1745_MODE_CONTROL1,
+        (BH1745_MODE_CONTROL1_MEASUREMENT_TIME_160MSEC)
+        );
+    write_register(SAD, BH1745_MODE_CONTROL2,
+        (BH1745_MODE_CONTROL2_RGBC_MEASUREMENT_ACTIVE |
+         BH1745_MODE_CONTROL2_ADC_GAIN_1X)
+        );
+}
+
+/* input param: data16, pointer to 4*16bit memory 
+   return: error, true/false */
+bool bh1745_read_data(uint16_t* data16){
+    #define BH1745_DATA_LEN 8
+    uint8_t data[BH1745_DATA_LEN];
+    uint8_t read_bytes;
+
+    read_bytes = read_register(SAD, BH1745_RED_DATA_LSBS, &data[0], BH1745_DATA_LEN);
+    if (read_bytes == BH1745_DATA_LEN){
+        data16[0] = (data[0]) | (data[1] << 8); //red
+        data16[1] = (data[2]) | (data[3] << 8); //green
+        data16[2] = (data[4]) | (data[5] << 8); //blue
+        data16[3] = (data[6]) | (data[7] << 8); //clear
+        return false;
+        }
+    else{
+        DEBUG_printf("Read error. Read %d bytes\n\r", read_bytes);
+        return true;
+        }
+   
+    }