BLE PRF SAMPLE¶
1 功能概述¶
此项目演示 BLE 从机和 2.4G 同时工作的双模场景，其在蓝牙从机 BLE Peripheral HR 例程的基础上增加了 PRF 2.4G 相关功能。
2 环境要求¶
board:
pan107x evbuart(option): 用来显示串口log（波特率921600，选项
8n1）手机app
nrf connect
4 演示说明¶
烧录完成后，设备复位会显示上电log，上电后的log如下：
Try to load HW calibration data.. DONE. - Chip Info : 0x1 - Chip CP Version : 255 - Chip FT Version : 6 - Chip MAC Address : E11000000FBC - Chip UID : 090001465454455354 - Chip Flash UID : 4250315A3538380B006ED94356031578 - Chip Flash Size : 512 KB [I] app started [I] ble stack init start... [I] Spark Controller Init Start. [I] BLE Heap size:3844 B, remain:64 B [I] Spark Controller Init OK. [I] ble host init ok -> ble thread start... [I] registered service 0x180a with handle=1 [I] registering characteristic 0x2a24 with def_handle=2 val_handle=3 [I] registering characteristic 0x2a25 with def_handle=4 val_handle=5 [I] registering characteristic 0x2a27 with def_handle=6 val_handle=7 [I] registering characteristic 0x2a26 with def_handle=8 val_handle=9 [I] registering characteristic 0x2a28 with def_handle=10 val_handle=11 [I] registering characteristic 0x2a29 with def_handle=12 val_handle=13 [I] registering characteristic 0x2a23 with def_handle=14 val_handle=15 [I] registered service 0x180d with handle=16 [I] registering characteristic 0x2a37 with def_handle=17 val_handle=18 [I] registering characteristic 0x2a38 with def_handle=20 val_handle=21 [W] Device Id Address: E1 10 00 00 0F BC [I] BLE adv start... [I] tx done [I] tx done [I] tx done [I] tx done [I] tx done [I] tx done [I] tx done [I] tx done [I] tx done
“tx done”是2.4g发送完一包后的打印，例程默认每隔500ms发送一次，偶尔会出现1s打印一次。这个是由于蓝牙和2.4g碰撞到一起的时候蓝牙优先级高，此时蓝牙工作2.4g不工作，2.4g主要在蓝牙空闲的时候工作。
使用手机
nrf connect扫描蓝牙设备名称ble_hr并且连接
nrf connect连接ble_hr¶
蓝牙广播和连接的同时也能发送2.4g包。
5 开发使用说明¶
5.1ble和prf初始化¶
双模例程必须使能双模的宏”PRF_BLE_DUAL_MODE”，目前宏定义在keil工程的Options->C/C++下选项Preprocessor Symbols中。
2.4g和BLE初始化代码如下：
pan_ant_init();
extern uint32_t BB_UsToTick(uint32_t us);
uint32_t tick = (*(volatile uint32_t *)0x50020014);
prf_tx.interval = BB_UsToTick(500000); //prf interval 500ms
prf_tx.slot_duration = 6; //prf work duration 6 * 1.25ms
prf_tx.before_point = 0;
prf_tx.anchor_point = tick;
prf_tx.AntStartCback = prf_event_handler; //prf event cb
prf_tx.AntStopCback = NULL;
prf_tx.priority = 0; //priority lowest 0,1,2; 2 highest
pan_ant_create(&prf_tx);
panchip_prf_init(&tx_config);
panchip_prf_set_chn(tx_config.rf_channel);
/*adr match bit */
PRI_RF_SetAddrMatchBit(PRI_RF, 0);
panchip_prf_set_data(&tx_payload);
panchip_prf_ble_resume();
/* start advertising */
app_ble_advertise_start();
2.4g和蓝牙广播初始化无先后顺序，例程默认是先初始化2.4g，然后初始化广播。
需要定义一个定时事件的结构体”ab_event_node_t”，包含定时间隔和定时回调等参数。
首先调用”pan_ant_init()”接口，初始化定时事件调度的内存空间和回调函数。然后注册结构体”pan_ant_create(&prf_tx)”，将2.4g事件插入到蓝牙事件的间隙中。
结构体中需要填写几个关键参数，结构体定义如下：
typedef struct{ uint32_t interval; /* unit: tick (32us) */ uint32_t slot_duration; /* event max duration unit: 1.25ms */ uint32_t before_point; /* unit: tick (32us) */ uint32_t anchor_point; /* 32k current count unit: tick (32us) */ void *event; /* ab_event_come_t event;*/ uint32_t reserve; uint8_t priority; /* priority lowest 0,1,2; 2 highest*/ uint8_t dy_scan; AntStartCback_t AntStartCback; AntStartCback_t AntStopCback; }ab_event_node_t;
注册完2.4g事件后就可以启动2.4g收发了，例程在500ms定时回调中启动2.4g发射，2.4g发完后会有tx中断。同理rx也是如此。
5.2ble和prf切换说明¶
目前例程ble和2.4g切换在底层接口已经实现好了，对用户来说是无感的。在此简单说明一下：
2.4g和蓝牙切换依赖于panchip_switch_prf接口，控制”pan_prf_config_t”结构体的成员变量中”prf_chip_mode_sel_t”如下
typedef enum {
PRF_CHIP_MODE_SEL_BLE = 1,
PRF_CHIP_MODE_SEL_XN297 = 2,
PRF_CHIP_MODE_SEL_NRF = 3,
}prf_chip_mode_sel_t;
如果工作在蓝牙模式则配成1，如果工作在2.4g模式则配成2或3。
2.4g和蓝牙共同使用同一个中断”LL_IRQHandler”，中断处理都是独立的。2.4g定时回调中切换工作模式到2.4g模式，2.4g产生中断后，即trx结束后切换工作模式到蓝牙模式。
2.4g中断服务函数：
uint8_t panchip_prf_ble_handler(void)
蓝牙中断服务函数：
PAN_BLE_STACK_API void pan_ble_irq(void);