MTK平台ALS上报数据流程.doc

针对ALS上报数据的流程，我这边大概的讲一下： MTK平台ALS使用轮询模式（polling mode）的话，系统会轮询调用这个函数 int stk3x1x_als_operate(void* self, uint32_t command, void* buff_in, int size_in,void* buff_out, int size_out, int* actualout) 传进来的参数cammand会以下对应的case： switch (command) { case SENSOR_DELAY: //设置sensor 延时 if((buff_in == NULL) || (size_in sizeof(int))) { APS_ERR(Set delay parameter error!\n); err = -EINVAL; } // Do nothing break; case SENSOR_ENABLE: //打开sensor ，就是打开ALS， if((buff_in == NULL) || (size_in sizeof(int))) { APS_ERR(Enable sensor parameter error!\n); err = -EINVAL; } else { value = *(int *)buff_in; if(value) /如果value的值为1的话，就会调用stk3x1x_enable_als函数 { if((err = stk3x1x_enable_als(obj-client, 1))) //打开als { APS_ERR(enable als fail: %d\n, err); return -1; } set_bit(STK_BIT_ALS, obj-enable); } Else //否则就关闭als { if((err = stk3x1x_enable_als(obj-client, 0))) //关闭als { APS_ERR(disable als fail: %d\n, err); return -1; } clear_bit(STK_BIT_ALS, obj-enable); } } break; case SENSOR_GET_DATA: //获取ALS的数据 if((buff_out == NULL) || (size_out sizeof(hwm_sensor_data))) { APS_ERR(get sensor data parameter error!\n); err = -EINVAL; } else { sensor_data = (hwm_sensor_data *)buff_out; #ifdef STK_GES if(obj-ges_enabled) { sensor_data-values[0] = stk3x1x_get_als_value(obj, obj-als_last); sensor_data-value_divide = 1; sensor_data-status = SENSOR_STATUS_ACCURACY_MEDIUM; break; } #endif err = stk3x1x_read_flag(obj-client, flag); //读取als的数据reading标志位 if(err) return err; if(!(flag STK_FLG_ALSDR_MASK)) //如果als数据 reading就继续return -1; //往下执行否则直接return -1 if((err = stk3x1x_read_als(obj-client, obj-als)))//从IC读取ALS数据保存到obj-als中 { err = -1; } else { if(obj-als 3) //当底层获取到的读值在3以下的时候，我们会直接忽略，上报0 { obj-als_