REG_DARFRCH
coex_stat->darfrch = rtw_read32(rtwdev, REG_DARFRCH);
rtw_write32(rtwdev, REG_DARFRCH, 0x4030201);
rtw_write32(rtwdev, REG_DARFRCH, coex_stat->darfrch);
rtw_write32(rtwdev, REG_DARFRCH, WLAN_DATA_RATE_FB_CNT_5_8);