STM32連接射頻si4438模塊

SI4438射頻模塊參數:

1、頻率范圍：425-525 MHz

2、數字接收信號強度指示(RSSI)

3、64字節收發數據寄存器(FIFO)

4、跳頻功能

等!

使用SI的WDS工具生成代碼

1、 選擇仿真模式

2、 芯片選擇si4438 B1模式

3、 Radio Configuration Application

4、 Select Application

1、 Select Project

選擇Bidirectional packet ，雙向通信模式

2、 Configure project 配置工程

Frequency and power： 頻率和功率的設置，

base freq基頻，中心頻率，

Channel spacing 通道空間，某個通道回憶 base freq+ channel spacin*num 為頻率通信，當然會有小浮動，但是浮動不會超過 Channel spacing。

計算通道號數量：

(Base freq + channel spacin*num) >=425MHz

(Base freq + channel spacin*num) =525MHz

所以Base freq的設置以及channel spacing的設置會影響到通道的數量。

Crystal：晶振默認!

其他的不動

RF parameter

這里設置的射頻參數，包括調制模式、數據速率等參數，RSSI threshold設置信號閾值。數據速率射頻之間的距離有關系，速度越快，對應的距離要求越短。所以這應該按照自己的需求來選。

Pakect數據包的設置，包括TX和RX緩沖區的長度、前導碼的配置Preamble、同步字的配置SyncWord、Field對應負載的字節數據，注意總的負載字節數為TX和RX閾值，具體分幾個fields看個人需求。

NIRQ配置成RX data output，即NIRQ和單片機引腳相連單片機可以通過該引腳判斷是否有數據接收。低電平有效!然后即可生成代碼!

生成的代碼是基于C8051F910單片機的，我們所用的是，所以必須做好移植。

SPI移植：

不需要生成spi.c，建立STM32 SPI配置文件：

#include

#include stm32f10x_spi.h

#include STM32SPI2.h

u8 STM32SPI2_ReadWriteByte(u8 TxData)

{

u8 retry=0;

while((SPI2->SR11) == 0) {

retry++;

if(retry>250)

return 0;

}

SPI2->DR=TxData;

retry=0;

while((SPI2->SR10) == 0)//

{

retry++;

if(retry>250)

return 0;

}

return SPI2->DR;

}

//APB2=72M/8=9M

void STM32SPI2_Config(void)

{

SPI_InitTypeDef SPI_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );

/* Configure SPI2 pins: SCK, MISO and MOSI */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

GPIO_Init(GPIOB, GPIO_InitStructure);

/* Configure NSEL pins */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

GPIO_Init(GPIOB, GPIO_InitStructure);

GPIO_SetBits(GPIOB, GPIO_Pin_12);

/* SPI2 configuration */

SPI_I2S_DeInit(SPI2);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

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_128;//SPI_BaudRatePrescaler_64;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_Init(SPI2, SPI_InitStructure);

/* Enable SPI2 */

SPI_Cmd(SPI2, ENABLE);

STM32SPI2_ReadWriteByte(0xff);//啟動傳輸

}

//í?ò?ê±?????üê1?üò???SPIéè±?,2?êyTYPE_SPI_ALL?TD§

void STM32SPI2_Enable(TYPE_SPI type)

{

/*

if(type == TYPE_SPI_FLASH) //這其實沒啥用

{

GPIO_SetBits(GPIOA,GPIO_Pin_4);//ê§?üRF

GPIO_ResetBits(GPIOC,GPIO_Pin_4);//ê1?üFLASH

}

else

{

*/

// GPIO_SetBits(GPIOC,GPIO_Pin_4);//ê§?üFLASH

GPIO_ResetBits(GPIOB,GPIO_Pin_12);//

/*

}

*/

}

void STM32SPI2_Disable(TYPE_SPI type)

{

if(type == TYPE_SPI_FLASH)

{

GPIO_SetBits(GPIOC,GPIO_Pin_4);//ê§?üFLASH

}

else if(type == TYPE_SPI_RF)

{

GPIO_SetBits(GPIOB,GPIO_Pin_12);//ê§?üRF

}

else

{

GPIO_SetBits(GPIOC,GPIO_Pin_4);//ê§?üFLASH

GPIO_SetBits(GPIOA,GPIO_Pin_4);//ê§?üRF

}

}

radio.c radio hal層 spi接口修改處

void radio_hal_SpiWriteByte(u8 byteToWrite)

{

STM32SPI2_ReadWriteByte(byteToWrite);

}

u8 radio_hal_SpiReadByte(void)

{

return STM32SPI2_ReadWriteByte(0xFF);

}

void radio_hal_SpiWriteData(u8 byteCount, u8* pData)

{

while(byteCount--)

{

STM32SPI2_ReadWriteByte(*pData++);

}

}

void radio_hal_SpiReadData(u8 byteCount, u8* pData)

{

while(byteCount--)

{

*pData++ = STM32SPI2_ReadWriteByte(0xFF);

}

}

Radio_Config:配置SDN power IRQ引腳

void Radio_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

//oíFLASH12ó?ò???SPI,SPIò??-?úFLASHμ?3?ê??ˉ?Dμ÷ó?

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC, ENABLE);

//RF_POWER

GPIO_InitStructure.GPIO_Pin = RF_POWER_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(RF_POWER_PORT, GPIO_InitStructure);

GPIO_SetBits(RF_POWER_PORT, RF_POWER_PIN);

//RF_ON

GPIO_InitStructure.GPIO_Pin = RF_

GPIO_InitStructure.GPIO_Pin = RF_ON_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(RF_ON_PORT, GPIO_InitStructure);

GPIO_SetBits(RF_ON_PORT, RF_ON_PIN);

//RF_SDN

GPIO_InitStructure.GPIO_Pin = RF_SDN_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(RF_SDN_PORT, GPIO_InitStructure);

GPIO_SetBits(RF_SDN_PORT, RF_SDN_PIN);

//RF_IRQ

GPIO_InitStructure.GPIO_Pin = RF_IRQ_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//????ê?è?

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(RF_IRQ_PORT, GPIO_InitStructure);

}

接收信號：

u8 radio_hal_NirqLevel(void)

{

return GPIO_ReadInputDataBit(RF_IRQ_PORT, RF_IRQ_PIN);

}

void radio_hal_AssertShutdown(void)

{

GPIO_SetBits(RF_SDN_PORT, RF_SDN_PIN);

}

void radio_hal_DeassertShutdown(void)

{

GPIO_ResetBits(RF_SDN_PORT, RF_SDN_PIN);

}

底層配置完畢，配置bsh頭文件：

#include stdio.h

#include compiler_defs.h

//#include platform_defs.h

//#include hardware_defs.h

//#include application_defs.h

//#include cdd_common.h

#include radio_config.h

#include radio.h

//#include sample_code_func.h

#include radio_hal.h

#define SILABS_RADIO_SI446X

#include radio_comm.h

#include si446x_api_lib.h

#include si446x_defs.h

//#include si446x_nirq.h

#include

//#include driversradioSi446xsi446x_patch.h

把不是自己的平臺的屏蔽了!

Main接收端

接收函數：

int SI4338RecvData(void* buf,u32 len){

u16 i,crc16;

u8* ptr;

SEGMENT_VARIABLE(bMain_IT_Status, U8, SEG_XDATA);

ptr = (u8*)buf;

if(ptr == NULL) return -1;

bMain_IT_Status = bRadio_Check_Tx_RX();

switch (bMain_IT_Status)

{

case SI446X_CMD_GET_INT_STATUS_REP_PH_PEND_PACKET_SENT_PEND_BIT:{

vRadio_StartRX(pRadioConfiguration->Radio_ChannelNumber, 64);

///* Clear Packet Sending flag */

}

break;

case SI446X_CMD_GET_INT_STATUS_REP_PH_PEND_PACKET_RX_PEND_BIT:{

memset(ptr,0,len);

memcpy(ptr,SI4338RecvData,SI4338RecvLen);

//recv OK ,you must start RX!

vRadio_StartRX(pRadioConfiguration->Radio_ChannelNumber,pRadioConfiguration->Radio_PacketLength);

return SI4338RecvLen;

}

break;

default:

break;

} /* switch */

return -1;

}

//注意:需要在U8 bRadio_Check_Tx_RX(void)函數把接收的數據拷貝出來，然后再RECV函數memcpy過來就可以了。

U8 bRadio_Check_Tx_RX(void){

……………………………………….

if(Si446xCmd.GET_INT_STATUS.PH_PEND SI446X_CMD_GET_INT_STATUS_REP_PH_PEND_PACKET_RX_PEND_BIT)

{

/* Packet RX */

/* Get payload length */

si446x_fifo_info(0x00);

si446x_read_rx_fifo(Si446xCmd.FIFO_INFO.RX_FIFO_COUNT, rxInformation[0]);

SI4338RecvLen =Si446xCmd.FIFO_INFO.RX_FIFO_COUNT;

memcpy(SI4338RecvData,rxInformation,Si446xCmd.FIFO_INFO.RX_FIFO_COUNT);

return SI446X_CMD_GET_INT_STATUS_REP_PH_PEND_PACKET_RX_PEND_BIT;

}

….

}

unsigned char buf[64];

int recvLen;

vRadio_StartRX(pRadioConfiguration->Radio_ChannelNumber,0u); 啟動接收

while(1){

if((recvLen = SI4338RecvData(void*( buf),64)) >0){

//處理接收的數據

}

}

發送端：使用這個函數發送既可以!

int SI4338SendData(void* buf,u32 len){

u8* ptr;

int ret = -1;

u16 i;

SEGMENT_VARIABLE(bMain_IT_Status, U8, SEG_XDATA);

ptr = (u8*)buf;

if(buf == NULL) return -1;

vRadio_StartTx_Variable_Packet(pRadioConfiguration->Radio_ChannelNumber,ptr, len);

#if 1

bMain_IT_Status = bRadio_Check_Tx_RX();

switch (bMain_IT_Status)

{

case SI446X_CMD_GET_INT_STATUS_REP_PH_PEND_PACKET_SENT_PEND_BIT:

//vRadio_StartTx_Variable_Packet(pRadioConfiguration->Radio_ChannelNumber,ptr, len);

vRadio_StartRX(pRadioConfiguration->Radio_ChannelNumber, pRadioConfiguration->Radio_PacketLength);

ret = 0;

break;

case SI446X_CMD_GET_INT_STATUS_REP_PH_PEND_PACKET_RX_PEND_BIT:{

vRadio_StartRX(pRadioConfiguration->Radio_ChannelNumber, pRadioConfiguration->Radio_PacketLength);

return SI4338RecvLen;

}

default: ;break;

}

#endif

return ret;

}