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- 2012-11-19
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const u8 TX_ADDRESS[TX_ADR_WIDTH]={0x34,0x43,0x10,0x10,0x01};
const u8 RX_ADDRESS[RX_ADR_WIDTH]={0x34,0x43,0x10,0x10,0x01};
void NRF24L01_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOG, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_12);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_SetBits(GPIOD,GPIO_Pin_2);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_Init(GPIOG, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOG, &GPIO_InitStructure);
// GPIO_ResetBits(GPIOG,GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8);
SPI2_Init();
SPI_Cmd(SPI2, DISABLE);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
SPI_Cmd(SPI2, ENABLE);
NRF24L01_CE=0;
NRF24L01_CSN=1;
}
u8 NRF24L01_Check(void)
{
u8 buf[5]={0XA5,0XA5,0XA5,0XA5,0XA5};
u8 i;
SPI2_SetSpeed(SPI_BaudRatePrescaler_4); /
NRF24L01_Write_Buf(WRITE_REG_NRF+TX_ADDR,buf,5);
NRF24L01_Read_Buf(TX_ADDR,buf,5);
for(i=0;i<5;i++)if(buf!=0XA5)break;
if(i!=5)return 1;
return 0;
}
/
u8 NRF24L01_Write_Reg(u8 reg,u8 value)
{
u8 status;
NRF24L01_CSN=0;
status =SPI2_ReadWriteByte(reg);/
SPI2_ReadWriteByte(value);
NRF24L01_CSN=1;
return(status);
}
u8 NRF24L01_Read_Reg(u8 reg)
{
u8 reg_val;
NRF24L01_CSN = 0;
SPI2_ReadWriteByte(reg);
reg_val=SPI2_ReadWriteByte(0XFF);
NRF24L01_CSN = 1;
return(reg_val);
}
u8 NRF24L01_Read_Buf(u8 reg,u8 *pBuf,u8 len)
{
u8 status,u8_ctr;
NRF24L01_CSN = 0;
status=SPI2_ReadWriteByte(reg);//
for(u8_ctr=0;u8_ctr<len;u8_ctr++)pBuf[u8_ctr]=SPI2_ReadWriteByte(0XFF);//
NRF24L01_CSN=1; //
return status; //·
}
u8 NRF24L01_Write_Buf(u8 reg, u8 *pBuf, u8 len)
{
u8 status,u8_ctr;
NRF24L01_CSN = 0;
status = SPI2_ReadWriteByte(reg);
for(u8_ctr=0; u8_ctr<len; u8_ctr++)SPI2_ReadWriteByte(*pBuf++); /
NRF24L01_CSN = 1; //
return status;
}
u8 NRF24L01_TxPacket(u8 *txbuf)
{
u8 sta;
SPI2_SetSpeed(SPI_BaudRatePrescaler_8);
NRF24L01_CE=0;
NRF24L01_Write_Buf(WR_TX_PLOAD,txbuf,TX_PLOAD_WIDTH);
NRF24L01_CE=1;/
while(NRF24L01_IRQ!=0);
sta=NRF24L01_Read_Reg(STATUS);
NRF24L01_Write_Reg(WRITE_REG_NRF+STATUS,sta);
if(sta&MAX_TX)
{
NRF24L01_Write_Reg(FLUSH_TX,0xff);
return MAX_TX;
}
if(sta&TX_OK)//·????ê??
{
return TX_OK;
}
return 0xff;
}
u8 NRF24L01_RxPacket(u8 *rxbuf)
{
u8 sta;
SPI2_SetSpeed(SPI_BaudRatePrescaler_8); //
sta=NRF24L01_Read_Reg(STATUS); //
NRF24L01_Write_Reg(WRITE_REG_NRF+STATUS,sta); //
if(sta&RX_OK)//??????????
{
NRF24L01_Read_Buf(RD_RX_PLOAD,rxbuf,RX_PLOAD_WIDTH);//?
NRF24L01_Write_Reg(FLUSH_RX,0xff);//
return 0;
}
return 1;//
}
void NRF24L01_RX_Mode(void)
{
NRF24L01_CE=0;
NRF24L01_Write_Buf(WRITE_REG_NRF+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH);//??RX???????·
NRF24L01_Write_Reg(WRITE_REG_NRF+EN_AA,0x01);
NRF24L01_Write_Reg(WRITE_REG_NRF+EN_RXADDR,0x01);//
NRF24L01_Write_Reg(WRITE_REG_NRF+RF_CH,40); //
NRF24L01_Write_Reg(WRITE_REG_NRF+RX_PW_P0,RX_PLOAD_WIDTH);//
NRF24L01_Write_Reg(WRITE_REG_NRF+RF_SETUP,0x0f);//
NRF24L01_Write_Reg(WRITE_REG_NRF+CONFIG, 0x0f);//
NRF24L01_CE = 1; //
}
void NRF24L01_TX_Mode(void)
{
NRF24L01_CE=0;
NRF24L01_Write_Buf(WRITE_REG_NRF+TX_ADDR,(u8*)TX_ADDRESS,TX_ADR_WIDTH);//
NRF24L01_Write_Buf(WRITE_REG_NRF+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH); //
NRF24L01_Write_Reg(WRITE_REG_NRF+EN_AA,0x01); /
NRF24L01_Write_Reg(WRITE_REG_NRF+EN_RXADDR,0x01); //
NRF24L01_Write_Reg(WRITE_REG_NRF+SETUP_RETR,0x1a);//
NRF24L01_Write_Reg(WRITE_REG_NRF+RF_CH,40); //
NRF24L01_Write_Reg(WRITE_REG_NRF+RF_SETUP,0x0f); //
NRF24L01_Write_Reg(WRITE_REG_NRF+CONFIG,0x0e); //
NRF24L01_CE=1;//CE????,10us?ó????·???
}
里面的 SPI2_Init(); 已经初始化一次SPI2了，为什么立刻 SPI_Cmd(SPI2, DISABLE);又失能，然后重新初始化呢？
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16; //
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //
SPI_InitStructure.SPI_CRCPolynomial = 7; //
SPI_Init(SPI2, &SPI_InitStructure); //?
SPI_Cmd(SPI2, ENABLE); //
而且分频系数也不一样，
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最佳答案
查看完整内容[请看2#楼]
默认的SPI2_Init不符合NRF24L01的时序要求(NRF奇葩)
所以SPI2_Init后,需要根据NRF24L01的特点,重新设置SPI的部分参数.所以才有后面的重新初始化.
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发表于 2014-7-9 15:04:27
发表于 2014-7-9 15:04:28
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