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unsigned char R,RegH, RegL;
void SPI_init(void)
{
SPI_CR1=0x06;
//SPI_CR1|=(7<<3);
SPI_CR2=0x03;//|=(1<<1)|(1<<0);//使能软件设置从设备 bit0置位做主模式
SPI_CR1|=0x40;
}
unsigned char SPI_SendByte(unsigned char fu8Data)
{
while(!(SPI_SR & 0X02));
SPI_DR = fu8Data;
while(!(SPI_SR & 0X01));
fu8Data = SPI_DR;
return fu8Data;
}
void LT_ReadReg(unsigned char reg)
{
int i=0;
SS_L;
for(i=0;i<10;i++);
reg = SPI_SendByte(reg+0x80);
for(i=0;i<10;i++);
RegH = SPI_SendByte(0xFF);
for(i=0;i<10;i++);
RegL = SPI_SendByte(0xFF);
for(i=0;i<10;i++);
SS_H;
}
void LT_WriteReg(unsigned char reg, unsigned char H, unsigned char L)
{
int i=0;
SS_L;
for(i=0;i<10;i++);
reg = SPI_SendByte(reg);
for(i=0;i<10;i++);
RegH = SPI_SendByte(H);
for(i=0;i<10;i++);
RegL = SPI_SendByte(L);
for(i=0;i<10;i++);
SS_H;
}
void LT_CleanWFIFO(void)
{
LT_ReadReg(52);
LT_WriteReg(52, 0x80, 0x00);
}
void LT8900_Init(void)
{
RST_H ;
delay_ms(1);
RST_L ; //Enable 8900
delay_ms(5); //delay 5ms to let LT8900 stable
CLK_L ; //set SPI clock to low
LT_WriteReg(0, 0x6F, 0xE0);
LT_WriteReg(1, 0x56, 0x81);
LT_WriteReg(2, 0x66, 0x17);
LT_WriteReg(4, 0x9C, 0xC9);
LT_WriteReg(5, 0x66, 0x37);
LT_WriteReg(7, 0x00, 0x30);// use for setting RF frequency and to start or stop TX /RX packets
LT_WriteReg(8, 0x6C, 0x90);
LT_WriteReg(9, 0x18, 0x40);//set TX power level
LT_WriteReg(10, 0x7F, 0xFD);//crystal osc.enabled
LT_WriteReg(11, 0x00, 0x08);//rssi enabled
LT_WriteReg(12, 0x00, 0x00);
LT_WriteReg(13, 0x48, 0xBD);
LT_WriteReg(22, 0x00, 0xff);
LT_WriteReg(23, 0x80, 0x05);//
LT_WriteReg(24, 0x00, 0x67);
LT_WriteReg(25, 0x16, 0x59);
LT_WriteReg(26, 0x19, 0xE0);
LT_WriteReg(27, 0x13, 0x00);
LT_WriteReg(28, 0x18, 0x00);
LT_WriteReg(32, 0x40, 0x00);//set preamble_len :3 byes. set syncword_len:16 bits ----Reg36[15:0]
LT_WriteReg(33, 0x3f, 0xC7);
LT_WriteReg(34, 0x20, 0x00);
LT_WriteReg(35, 0x03, 0x00);
LT_WriteReg(36, 0x03, 0x80);//set sync words
LT_WriteReg(37, 0x03, 0x80);//set sync words
LT_WriteReg(38, 0x5A, 0x5A);//set sync words
LT_WriteReg(39, 0x03, 0x80);//set sync words
LT_WriteReg(40, 0x44, 0x01);
LT_WriteReg(41, 0xb0, 0x00);//crc on scramble off ,1st byte packet length ,auto ack off
LT_WriteReg(42, 0xFD, 0xB0);
LT_WriteReg(43, 0x00, 0x0F);//configure scan_rssi
LT_WriteReg(50, 0x00, 0x00);
delay_us(10000); //delay 10ms to let LT8900 for operation
}
void gpio_init(void)
{
PC_DDR |= (1<<PIN_SPI_CLK) | (1<<PIN_MOSI) | (1<<PIN_RST) | (1<<PIN_SPI_SS);
PC_CR1 |= (1<<PIN_SPI_CLK) | (1<<PIN_MOSI) | (1<<PIN_RST) | (1<<PIN_SPI_SS);
PC_CR2 &= (0<<PIN_SPI_CLK) | (0<<PIN_MOSI) | (0<<PIN_RST) | (0<<PIN_SPI_SS);
PC_DDR &= (0<<PIN_MISO);
PC_CR1 |= (1<<PIN_MISO);
PC_CR2 &= (0<<PIN_MISO);
PB_DDR &= (0<<PIN_PKT);
PB_CR1 |= (1<<PIN_PKT);
PB_CR2 &= (0<<PIN_PKT);
//LED define
PB_DDR |= (1<<5);
PB_CR1 |= (1<<5);
PB_CR2 &= (0<<5);
PB_ODR &= (0<<5);
}
/*************************发送********/
void main(void)
{
CLK_CKDIVR = 0x00;
delay_init(16);
gpio_init();
SPI_init();
LT8900_Init();
RST_H ; //Enable 8900
delay_ms(5); //delay 5ms to let LT8900 stable
while(1)
{
LT_WriteReg(52, 0x80, 0x00);
LT_WriteReg(50, 0x64, 0x00);
LT_WriteReg(7, 0x01, 0x20);
while((PB_IDR & 0x08)!=0x08);//等待PKT
}
}
/*****************************接收*******/
void main()
{
unsigned char regh1,regl1;
CLK_CKDIVR = 0x00;
delay_init(16);
gpio_init();
SPI_init();
LT8900_Init();
while(1)
{
LT_WriteReg(52, 0x80, 0x80);
LT_WriteReg(7, 0x01, 0x20);
while((PB_IDR & 0x08)!=0x08);
LT_ReadReg(50);
regh1 = RegH;
regl1 = RegL;
if(regh1 == 0x64)
{
PB_ODR |= (1<<5);//led off
}
}
}
}
大家看看哪里不行……总是控制不了。没信号…… |
阿莫论坛20周年了!感谢大家的支持与爱护!!
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