pms7003_get_pm
pms7003_get_pm(frame->data + PMS7003_PM1_OFFSET);
pms7003_get_pm(frame->data + PMS7003_PM2P5_OFFSET);
pms7003_get_pm(frame->data + PMS7003_PM10_OFFSET);
*val = pms7003_get_pm(frame->data + chan->address);