SPI主从模式，蓝牙scan后6秒钟左右自动停止

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我们移植了SDK5.0.4中SPI主从模式的proximity工程。 在HadleGapmCmpEvt收到GAPM_SET_DEV_CONFIG回应后开启Scan. 能够正常scan到周围设备的广播包。 但是scan过程只持续了6s左右，就收到了scan结束的消息，错误码0x45 GAP_ERR_TIMEOUT. 如下是scan的log和scan的参数。 请问要如何修改才能保持长时间持续扫描，谢谢！

struct *msg = BleMsgAlloc(GAPM_START_SCAN_CMD, TASK_GAPM, TASK_GTL,
sizeof(struct gapm_start_scan_cmd));
msg->mode = GAP_GEN_DISCOVERY;
msg->op.code = GAPM_SCAN_PASSIVE;//GAPM_SCAN_ACTIVE;
msg->op.addr_src = GAPM_PUBLIC_ADDR;
msg->filter_duplic = SCAN_FILT_DUPLIC_EN;
msg->interval = 10;
msg->window = 5;
//msg->operation = GAPM_RESET;
msg->filt_policy = SCAN_ALLOW_ADV_ALL;
msg->filter_duplic = SCAN_FILT_DUPLIC_EN;

BleSendMsg(msg);

Sys UP:1
HandleBleMsg:3401
HCI Msg 2 spi 3402
spi2_send_hci_msg
HandleBleMsg:3400
HadleGapmCmpEvt:1[0]
app_proxr_db_create
HCI Msg 2 spi 4003
spi2_send_hci_msg
HandleBleMsg:4004
app_set_mode
HCI Msg 2 spi 3404
spi2_send_hci_msg
HandleBleMsg:3400
HadleGapmCmpEvt:3[0]
app_start_scan_gap
msg->op.code = 10
HCI Msg 2 spi 340f
spi2_send_hci_msg
HandleBleMsg:3410
ADDR16:15:14
RSSI45
HandleBleMsg:3410
ADDR16:15:14
RSSI49
HandleBleMsg:3410
ADDR16:15:14
RSSI44
HandleBleMsg:3410
ADDR16:15:14
RSSI3a
HandleBleMsg:3400
HadleGapmCmpEvt:10[45]