lt8900驱动及应用编程指南for初学者

1、#define uchar unsigned charuchar dataH,dataL;/定义全局变量用来保存数据/*脚位定义*/sbit SPI_CLK = P14;sbit SPI_MISO = P15; sbit SPI_MOSI = P22;sbit SPI_SS = P23;/片选sbit LT_RESET_N = P24;sbit LT_PKT_FLAG = P25;/LT8900 pkt脚uchar RX_data8;/定义数据缓冲区，保存LT8900收到的数据/*从8900读一个字节*/uchar SPI_read8bit()uchar i,data;for(i=0;i<

2、;8;i+)data=data<<1;SPI_CLK=1;_NOP(); /空指令,稍微延时一下_NOP();_NOP();SPI_CLK=0;if(SPI_MISO=1)data=data|0x01;if(SPI_MISO=0)data=data|0x00;return data;/*往8900写一个字节*/void SPI_write8bit(uchar data)uchar i;for(i=0;i<8;i+)data=data<<1;SPI_CLK=1;_NOP();_NOP();_NOP();SPI_MOSI=C;SPI_CLK=0;/*从地址addr读数

3、据，LT8900寄存器是16位的，*hdata用来保存高8位，ldata用来保存低8位*/void LT8900_writeReg(uchar add,uchar hdata,uchar ldata)SPI_SS=0;/拉低LT8900使能脚，使能LT8900_NOP();SPI_write8bit(add&0X7F);/地址最高位0表示写_NOP();_NOP();SPI_write8bit(hdata);SPI_write8bit(ldata);_NOP();SPI_SS=1;/完毕重新拉高LT8900使能脚void LT8900_readReg(uchar add)SPI_SS=

4、0; /拉低LT8900使能脚，使能LT8900_NOP();SPI_write8bit(add|0x80);/地址最高位1表示读_NOP();_NOP();dataH=SPI_read8bit();/data high bytedataL=SPI_read8bit();/data low byte_NOP();SPI_SS=1; /完毕重新拉高LT8900使能脚/*以上4个函数就是LT8900最底层的4个函数，应用程序可以直接调用。*/void delayms(uchar ms)uchar i,j;for(i=0;i<ms;i+)for(j=0;j<100;j+);/*以下是LT

5、8900接收的初始化代码*/void LT8900_RX_INIT(void)LT_RESET_N=0;/关闭芯片delayms(10);LT_RESET_N=1;/开启芯片，寄存器复位delayms(50);LT8900_writeReg(0, 0x6f, 0xe0);LT8900_writeReg(1, 0x56, 0x81);LT8900_writeReg(2, 0x66, 0x17);LT8900_writeReg(4, 0x9c, 0xc9);LT8900_writeReg(5, 0x66, 0x37);LT8900_writeReg(7, 0x00, 0x4c);LT8900_wr

6、iteReg(8, 0x6C, 0x90);LT8900_writeReg(9, 0x18, 0x40);LT8900_writeReg(10, 0x7F, 0xFD);LT8900_writeReg(11, 0x00, 0x08);LT8900_writeReg(12, 0x00, 0x00);LT8900_writeReg(13, 0x48, 0xBD);LT8900_writeReg(22, 0x00, 0xff);LT8900_writeReg(23, 0x80, 0x05);LT8900_writeReg(24, 0x00, 0x67);LT8900_writeReg(25, 0x1

7、6, 0x59);LT8900_writeReg(26, 0x19, 0xE0);LT8900_writeReg(27, 0x13, 0x00);LT8900_writeReg(28, 0x18, 0x00);LT8900_writeReg(32, 0x48, 0x00);LT8900_writeReg(33, 0x3f, 0xC7);LT8900_writeReg(34, 0x20, 0x00);LT8900_writeReg(35, 0x03, 0x00);LT8900_writeReg(36, 0x05, 0x0A);LT8900_writeReg(39, 0x55, 0xAA);LT8

8、900_writeReg(40, 0x44, 0x01);LT8900_writeReg(41, 0xB0, 0x00);LT8900_writeReg(42, 0xFD, 0xB0);LT8900_writeReg(43, 0x00, 0x0F);LT8900_writeReg(50, 0x00, 0x00);LT8900_writeReg(52, 0x80, 0x80);LT8900_writeReg(7, 0x00, 0X84);delayms(50);/delay 50ms to let LT8900 for operation接收的应用程序可以这样写：Void main(void)i

9、nt i;LT8900_RX_INIT();While(1)if(LT_PKT_FLAG=1) /如果LT8900的PKT脚被拉高，说明收到了数据/* Register 52 的bit813将指示收到多少字节数据，一般来说发端发送多少个字节的数据是确定的，读这个字节用来校验收到的数据包数据长度是否正确*/LT8900_readReg(52);if(dataH&0x3f) = 8)/这里假定发端发的是8个字节的数据包SPI_SS=0;/使能8900/*向LT8900的Register50发送读命令*/SPI_write8bit(50|0x80);_NOP();_NOP();_NOP();

10、_NOP();for(i=0;i<8;i+)RX_datai=SPI_read8bit(); /将8字节数据全部读出_NOP();_NOP();SPI_SS=1;/*以下两步是必须的，1.清空FIFO，2.重新设置频道，LT8900再次进入接收状态*/LT8900_writeReg(52, 0x80, 0x80);LT8900_writeReg(7, 0x00, 0X84);/*接下来就可以根据收到的数据(在数组RX_data中)，去干你想干的事情了*/*以下是LT8900发送的初始化代码*/void LT8900_TX_INIT(void)LT_RESET_N=0;/关闭芯片delay

11、ms(10);LT_RESET_N=1;/开启芯片，寄存器复位delayms(50);LT8900_writeReg(0, 0x6f, 0xe0);LT8900_writeReg(1, 0x56, 0x81);LT8900_writeReg(2, 0x66, 0x17);LT8900_writeReg(4, 0x9c, 0xc9);LT8900_writeReg(5, 0x66, 0x37);LT8900_writeReg(7, 0x00, 0x4c);LT8900_writeReg(8, 0x6C, 0x90);LT8900_writeReg(9, 0x18, 0x40);LT8900_wr

12、iteReg(10, 0x7F, 0xFD);LT8900_writeReg(11, 0x00, 0x08);LT8900_writeReg(12, 0x00, 0x00);LT8900_writeReg(13, 0x48, 0xBD);LT8900_writeReg(22, 0x00, 0xff);LT8900_writeReg(23, 0x80, 0x05);LT8900_writeReg(24, 0x00, 0x67);LT8900_writeReg(25, 0x16, 0x59);LT8900_writeReg(26, 0x19, 0xE0);LT8900_writeReg(27, 0

13、x13, 0x00);LT8900_writeReg(28, 0x18, 0x00);LT8900_writeReg(32, 0x48, 0x00);LT8900_writeReg(33, 0x3f, 0xC7);LT8900_writeReg(34, 0x20, 0x00);LT8900_writeReg(35, 0x03, 0x00);LT8900_writeReg(36, 0x05, 0x0A);LT8900_writeReg(39, 0x55, 0xAA);LT8900_writeReg(40, 0x44, 0x01);LT8900_writeReg(41, 0xB0, 0x00);L

14、T8900_writeReg(42, 0xFD, 0xB0);LT8900_writeReg(43, 0x00, 0x0F);LT8900_writeReg(50, 0x00, 0x00);LT8900_writeReg(52, 0x80, 0x80);LT8900_writeReg(7, 0x01, 0x04);delayms(50);/delay 50ms to let LT8900 for operation/*LT8900发送的一个应用程序*/uchar TX_data8;void main(void)int i;LT8900_TX_INIT();While(1)if(/*这里是你要发送的条件，条件成立就进去发送*/)/首先把你要发送的数据填充到数组TX_data，如TX_data0 = 0x07,TX_data1=0x5a,.LT8900_writeReg(7, 0x00, 0X00); /stop tx,停止发送LT8900_writeReg(52,