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<span style="font-family:'trebuchet ms, verdana, arial, helvetica, sans-serif';"><b style="font-size:14px;line-height:16px;">上一章我讲了2个nrf51822之间的通讯</b><br />
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<b style="font-size:14px;line-height:16px;">这次讲nrf24L01+和nrf51822之间的通讯。</b><br />
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<span style="font-size:14px;line-height:16px;">关键的地方是地址,只有完全掌握地址每个bit才能玩好通讯</span><br />
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<div><span style="font-size:14px;line-height:16px;">// 无线地址设置</span></div>
<div><span style="font-size:14px;line-height:16px;">//地址一共40个add_bit是add0~add39</span></div>
<div><span style="font-size:14px;line-height:16px;">//在2401地址add0先写(add0,add1,add2......add39)</span></div>
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<div><span style="font-size:14px;line-height:16px;">//那2401和51822的地址关系如下</span></div>
<div><span style="font-size:14px;line-height:16px;">// 2401[add0 :add7] =PREFIX0[bit7:bit0](add7,add6,add5,add4,add3,add2,add1,add0)</span></div>
<div><span style="font-size:14px;line-height:16px;">// 2401[add8 :add15]=BASE0[bit31:bit24](add15,add14,add13,add12,add11,add10,add9,add8)</span></div>
<div><span style="font-size:14px;line-height:16px;">// 2401[add16:add23]=BASE0[bit23:bit16](add23,add22,add21,add20,add19,add18,add17,add16)</span></div>
<div><span style="font-size:14px;line-height:16px;">// 2401[add24:add31]=BASE0[bit15:bit8] (add31,add30,add29,add28,add27,add26,add25,add24)</span></div>
<div><span style="font-size:14px;line-height:16px;">// 2401[add32:add39]=BASE0[bit7 :bit0] (add39,add38,add37,add36,add35,add34,add33,add32)</span></div>
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<div><span style="font-size:14px;line-height:16px;">//以上结论得出的2401地址是每8个bit首尾对调。以下是官方用的地址</span></div>
<div><span style="font-size:14px;line-height:16px;">//const u8 ip[6]={0xE7,0xE7,0xE7,0xE7,0xE7,0x00};//发射地址 从[bit0~7] [bit8~15] [bit16~23] [bit24~31] [bit32~39]</span></div>
<div><span style="font-size:14px;line-height:16px;">//const u8 ip0[6]={0xE7,0xE7,0xE7,0xE7,0xE7,0x00};//接收地址0 和51822通讯我调了(bit0先写)</span></div>
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<div><span style="font-size:14px;line-height:16px;">//const u8 ip1[6]={0xC2,0xC2,0xC2,0xC2,0xC2,0x00};//接收地址1 bit39~bit8为"0x43"(bit0先写)</span></div>
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<div><span style="font-size:14px;line-height:16px;">//const u8 ip2[6]={0xC3,0x00};//接收地址2 bit39~8和通道1共用,只写bit0~bit7</span></div>
<div><span style="font-size:14px;line-height:16px;">//const u8 ip3[6]={0xC4,0x00};//接收地址3<span class="Apple-tab-span" style="white-space:pre;"> </span>通道2345只能设置char</span></div>
<div><span style="font-size:14px;line-height:16px;">//const u8 ip4[6]={0xC5,0x00};//接收地址4<span class="Apple-tab-span" style="white-space:pre;"> </span>写的时候顺序是bit0~bit39</span></div>
<div><span style="font-size:14px;line-height:16px;">//const u8 ip5[6]={0xC6,0x00};//接收地址5<span class="Apple-tab-span" style="white-space:pre;"> </span>只有bit0~7有用。接收地址6:0xC7 接收地址7:0xC8</span></div>
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<div><span style="font-size:14px;line-height:16px;">//无线功率4分贝,2424MHz,通道0地址FUCK0,通道1~7地址FUCK 1~7</span></div>
<div><span style="font-size:14px;line-height:16px;">//速率2MHz,数据字节3字节QXC(Q开始,C结束,x是数据char)</span></div>
<div><span style="font-size:14px;line-height:16px;">void radio_configure()//无线配置,准备和nrf24L01通讯</span></div>
<div><span style="font-size:14px;line-height:16px;">{</span></div>
<div><span style="font-size:14px;line-height:16px;"> //无线功率04:+4分贝,0:0分贝,FC:-4分贝,F8:-8分贝</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span>// F4:-12分贝,F0:-16分贝,EC:-20分贝,D8:-30分贝</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span>NRF_RADIO->TXPOWER = (0x04<<0);//无线功率4分贝</span></div>
<div><span style="font-size:14px;line-height:16px;"> </span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span>NRF_RADIO->FREQUENCY = 24UL;//无线频率24MHz+2400MHz=2424MHz</span></div>
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<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span>//无线速率:00:1Mbit,01:2Mbit,02:250Kbit,03:1Mbit(蓝牙)</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span>NRF_RADIO->MODE = (01<<0);//速率2MHz</span></div>
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<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span>// 无线地址关系设置</span></div>
<div><span style="font-size:14px;line-height:16px;">// * 51822[31:24] = 2401[24:31] </span></div>
<div><span style="font-size:14px;line-height:16px;">// * 51822[23:16] = 2401[16:23]</span></div>
<div><span style="font-size:14px;line-height:16px;">// * 51822[15:8] = 2401[8:15]</span></div>
<div><span style="font-size:14px;line-height:16px;">// * 51822[7:0] = 2401[0:7]</span></div>
<div><span style="font-size:14px;line-height:16px;">// 通道3 到 0 的低字节</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span>NRF_RADIO->REFIX0 =(0x23<<24) // 通道3的低字节地址C4 1100 0100</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0xC3<<16) // 通道2的低字节地址C3 1100 0011</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0x43<< 8) // 通道1的低字节地址C2 1100 0010</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0xE7<< 0);// 通道0的低字节地址E7 1110 0111</span></div>
<div><span style="font-size:14px;line-height:16px;">// 通道7 到 4 的低字节地址</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span>NRF_RADIO->REFIX1 =(0x13<<24) // 通道7的低字节地址C8 1100 1000</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0xE3<<16) // 通道6的低字节地址C7 1100 0111</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0x63<< 8) // 通道5的低字节地址C6 1100 0110</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0xA3<< 0);// 通道4的低字节地址C5 1100 0101</span></div>
<div><span style="font-size:14px;line-height:16px;"> </span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->BASE0 = (0xE7<<24) // 通道0的高字节E7</span></div>
<div><span style="font-size:14px;line-height:16px;"> |(0xE7<<16)</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0xE7<<8)</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0xE7<<0);</span></div>
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<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->BASE1 = (0x43<<24) // 通道1-7的高字节C2 1100 0010</span></div>
<div><span style="font-size:14px;line-height:16px;"> |(0x43<<16)</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0x43<<8)</span></div>
<div><span style="font-size:14px;line-height:16px;"><span class="Apple-tab-span" style="white-space:pre;"> </span> |(0x43<<0);</span></div>
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<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->TXADDRESS = 0x01UL; // 发射使用的通道号:1通道</span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->RXADDRESSES = 0x02UL; // 接收的通道号:0通道</span></div>
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<div><span style="font-size:14px;line-height:16px;"> // 配置包0的设置</span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->CNF0 = (0<<16)| //S1领域的长度</span></div>
<div><span style="font-size:14px;line-height:16px;"> (0<<8) | //S0场的长度</span></div>
<div><span style="font-size:14px;line-height:16px;"> (0<<0); //长度字段中的比特数</span></div>
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<div><span style="font-size:14px;line-height:16px;"> // 配置包1的设置</span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->CNF1 = (0<<25)| //效验位(0关,1开)</span></div>
<div><span style="font-size:14px;line-height:16px;"> (1<<24)| //数据大小端(高低字节哪个先发 0低字节,1高字节)</span></div>
<div><span style="font-size:14px;line-height:16px;"> (4<<16)| //通道1~7高字节长度( nrf24高低字节5字节:4个高+1个低)</span></div>
<div><span style="font-size:14px;line-height:16px;"> (32<<8) | //数据字节长度(255~1)32字节QxC</span></div>
<div><span style="font-size:14px;line-height:16px;"> (32<<0); //硬件传输字节长度(255~1)32字节QxC</span></div>
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<div><span style="font-size:14px;line-height:16px;"> // CRC 校验长度配置</span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->CRCCNF = 2; // 校验长度 2个char</span></div>
<div><span style="font-size:14px;line-height:16px;"> if ((NRF_RADIO->CRCCNF & 0x03)== 2 )</span></div>
<div><span style="font-size:14px;line-height:16px;"> {</span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->CRCINIT = 0xFFFFUL; // 校验初始值</span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->CRCPOLY = 0x11021UL; // CRC poly: x^16+x^12^x^5+1</span></div>
<div><span style="font-size:14px;line-height:16px;"> }</span></div>
<div><span style="font-size:14px;line-height:16px;"> else if ((NRF_RADIO->CRCCNF & 0x03) == 1 )</span></div>
<div><span style="font-size:14px;line-height:16px;"> {</span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->CRCINIT = 0xFFUL; // 校验初始值</span></div>
<div><span style="font-size:14px;line-height:16px;"> NRF_RADIO->CRCPOLY = 0x107UL; // CRC poly: x^8+x^2^x^1+1</span></div>
<div><span style="font-size:14px;line-height:16px;"> }</span></div>
<div><span class="Apple-tab-span" style="white-space:pre;font-size:14px;line-height:16px;"> </span></div>
<div><span style="font-size:14px;line-height:16px;">//接收寄存器是 NRF_RADIO->ACKETPTR<span class="Apple-tab-span" style="white-space:pre;"> </span></span></div>
<div><span style="font-size:14px;line-height:16px;">}</span></div>
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