方案名稱：915MHZ中遠(yuǎn)距離無線通信模塊
設(shè)計(jì)簡要說明：
利用MCU+RF實(shí)現(xiàn)中心頻率915MHZ的無線收發(fā)系統(tǒng)，具體參數(shù)規(guī)格如下：
通信距離：1000-2000m
通信速率：0~57600kbs
接口類型：Micro USB/TTL串口
供電方式：USB/外部電源供電
供電范圍：DC5-18V
申請(qǐng)物料：
HY0320 10顆
HY0620 10顆
【后羿DIY】低功耗遠(yuǎn)距離無線通信模塊開發(fā)（結(jié)貼）
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方案設(shè)計(jì)
方案采用MCU+RF的結(jié)構(gòu)，MCU采用STM2F042F6P6作為主控，RF收發(fā)器采用siliconlabs的高性能Sub1G芯片SI4463,兩個(gè)主芯片均工作在低功耗模式下，保證系統(tǒng)在性能可靠的前提下，降低系統(tǒng)功耗，通過經(jīng)過優(yōu)化算法的數(shù)傳無線收發(fā)算法，保證數(shù)據(jù)能考可靠穩(wěn)定的進(jìn)行傳輸。
下面開始上電路圖
電源電路，輸入電壓范圍DC5V-24V,增加了可恢復(fù)保險(xiǎn)絲，由于空間問題沒有在輸入端增加TVS做保護(hù)
TTL串口電路，為了增加系統(tǒng)穩(wěn)定性和可靠性，串聯(lián)了電阻，另外為做好接口兼容性，保證5V TTL串口電平，中間使用了后羿電子提供的MOSFET HY0320作為電平轉(zhuǎn)換，保證3.3V和5V電平相互轉(zhuǎn)換。
MCU主控電路，主控電路與RF芯片之間通過SPI接口進(jìn)行通信，完成數(shù)據(jù)的收發(fā)以及控制。
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RF射頻電路，該電路需要通過大量測試進(jìn)行參數(shù)匹配，保證系統(tǒng)信號(hào)完整性。其中為了降低系統(tǒng)功耗，使用后羿電子提供的HY0620 進(jìn)行電源的供電與斷開的控制。
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方案設(shè)計(jì)方案采用MCU+RF的結(jié)構(gòu)，MCU采用STM2F042F6P6作為主控，RF收發(fā)器采用siliconlabs的高性能Sub1G芯片SI4463,兩個(gè)主芯片均工作在低功耗模式下，保證系統(tǒng)在性能可靠的前提下，降低系統(tǒng)功耗，通過經(jīng)過優(yōu)化算法的數(shù)傳無線收發(fā)算法，保證數(shù)據(jù)能考可靠穩(wěn)定的進(jìn)行傳輸。下面開始上電路圖電源電路，輸入電壓范圍DC5V-24V,增加了可恢復(fù)保險(xiǎn)絲，由于空間問題沒有在輸入端增加TVS做保護(hù)[圖片]TTL串口電路，為了增加系統(tǒng)穩(wěn)定性和可靠性，串聯(lián)了電阻，另外為做好接口兼容性，保證5VTTL串口電平，中間使用了后羿電子提供的MOSFET HY0320作為電平轉(zhuǎn)換，保證3.3V和5V電平相互轉(zhuǎn)換。[圖片]MCU主控電路，主控電路與RF芯片之間通過SPI接口進(jìn)行通信，完成數(shù)據(jù)的收發(fā)以及控制。[圖片].RF射頻電路，該電路需要通過大量測試進(jìn)行參數(shù)匹配，保證系統(tǒng)信號(hào)完整性。其中為了降低系統(tǒng)功耗，使用后羿電子提供的HY0620進(jìn)行電源的供電與斷開的控制。[圖片]
本來打算等樣片到了再繼續(xù)搞，過一段時(shí)間會(huì)比較忙，所以不等樣片了，先搞起來了，本來可以做2層板的，但是由于體積限制，板子空間太小，被迫做了4層PCB，好在目前的4層PCB的成本也不高，上PCB圖，板子尺寸：30*15mm
PCB布局圖（頂層）
PCB布局圖（底層）
中間層
中間層（電源層）
底層布線
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本來打算等樣片到了再繼續(xù)搞，過一段時(shí)間會(huì)比較忙，所以不等樣片了，先搞起來了，本來可以做2層板的，但是由于體積限制，板子空間太小，被迫做了4層PCB，好在目前的4層PCB的成本也不高，上PCB圖，板子尺寸：30*15mm[圖片]PCB布局圖（頂層）[圖片]PCB布局圖（底層）[圖片]頂層布線，射頻進(jìn)行了50歐姆阻抗控制，保證信號(hào)的完整性。對(duì)射頻電路進(jìn)行了合理的規(guī)劃布局。[圖片]中間層[圖片]中間層（電源層）[圖片]底層布線[圖片]
PCB進(jìn)行阻抗匹配，通過控制線間距、線寬、對(duì)地距離保證50歐姆阻抗匹配
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上代碼，完整工程圖，基于Keil5開發(fā)[圖片]
主程序結(jié)構(gòu)如下：
/* USER CODE END 0 */
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_IWDG_Init();
MX_SPI1_Init();
// MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
//GetLockCode();
//rev_ID_write(Lock_Code1);
//Lock_Code=0;
//Lock_Code=rev_ID_read();
// if(Lock_Code != Lock_Code1)
// return 0; //??0x123456789ABC??????ID
RF_init();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
RF_TX_RX_CTRL();
RF_Process();
HAL_IWDG_Refresh(&hiwdg);//watch dog
}
/* USER CODE END 3 */
} 0
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主程序結(jié)構(gòu)如下：/*USERCODEEND0*/intmain(void){/*USERCODEBEGIN1*//*USERCODEEND1*//*MCUConfiguration----------------------------------------------------------*//*Resetofallperipherals,InitializestheFlashinterfaceandtheSystick.*/HAL_Init();/*Configurethesystemclock*/SystemClock_Config();/*Initializeallconfiguredperipherals*/MX_GPIO_Init();MX_DMA_Init();MX_IWDG_Init();MX_SPI1_Init();//MX_USART1_UART_Init();/*USERCODEBEGIN2*///GetLockCode();//rev_ID_write(Lock_Code1);//Lock_Code=0;//Lock_Code=rev_ID_read();//if(Lock_Code!=Lock_Code1)//return0;//??0x123456789ABC??????IDRF_init();/*USERCODEEND2*//*Infiniteloop*//*USERCODEBEGINWHILE*/while(1){/*USERCODEENDWHILE*//*USERCODEBEGIN3*/RF_TX_RX_CTRL();RF_Process();HAL_IWDG_Refresh(&hiwdg);//watchdog}/*USERCODEEND3*/}
產(chǎn)品設(shè)計(jì)中涉及用到的外設(shè)包括SPI、USART、DMA、定時(shí)器以及看門狗。
其中SPI用來與RF射頻收發(fā)器進(jìn)行數(shù)據(jù)傳輸以及參數(shù)配置，USART作為用戶數(shù)據(jù)的收發(fā)，DMA與USART配合提高數(shù)據(jù)收發(fā)效率
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產(chǎn)品設(shè)計(jì)中涉及用到的外設(shè)包括SPI、USART、DMA、定時(shí)器以及看門狗。其中SPI用來與RF射頻收發(fā)器進(jìn)行數(shù)據(jù)傳輸以及參數(shù)配置，USART作為用戶數(shù)據(jù)的收發(fā)，DMA與USART配合提高數(shù)據(jù)收發(fā)效率
RF收發(fā)器調(diào)試，首先通過SPI接口讀取RF收發(fā)器的ID，如果ID為4463，那么可以證明通信接口通信沒問題，對(duì)RF收發(fā)芯片的初始化配置操作在工程中void RF_init()函數(shù)中實(shí)現(xiàn)，下面上具體參數(shù)配置源碼
void RF_init()
{
Si4463_GpioInt();
HAL_DMA_Abort_IT(&hdma_usart1_tx);
HAL_DMA_Abort_IT(&hdma_usart1_rx);
RF_parameters_init();
RF_parameters_read();
MX_USART1_UART_Init();
HAL_UART_Receive_DMA(&huart1,tx_ph_data,buffer_size);
__HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE); //??????
sdn_reset();// reset RF
SI4463_init(); // RF INIT
delay_us(200);
spi_read_info();
delay_us(200);
HAL_NVIC_EnableIRQ(EXTI2_3_IRQn);
HAL_NVIC_ClearPendingIRQ(EXTI2_3_IRQn);
HAL_NVIC_SetPriority(EXTI2_3_IRQn, 1, 0);
delay_us(200);
nIRQ=1;
recv_end_flag=0;
uart_rx_len=0;
rx_len_tmp=0;
len_var=0;
rx_init();
__HAL_UART_CLEAR_IDLEFLAG(&huart1);
HAL_IWDG_Start(&hiwdg);//start iwdg
}
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RF收發(fā)器調(diào)試，首先通過SPI接口讀取RF收發(fā)器的ID，如果ID為4463，那么可以證明通信接口通信沒問題，對(duì)RF收發(fā)芯片的初始化配置操作在工程中voidRF_init()函數(shù)中實(shí)現(xiàn)，下面上具體參數(shù)配置源碼voidRF_init(){Si4463_GpioInt();HAL_DMA_Abort_IT(&hdma_usart1_tx);HAL_DMA_Abort_IT(&hdma_usart1_rx);RF_parameters_init();RF_parameters_read();MX_USART1_UART_Init();HAL_UART_Receive_DMA(&huart1,tx_ph_data,buffer_size);__HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE);//??????sdn_reset();//resetRFSI4463_init();//RFINITdelay_us(200);spi_read_info();delay_us(200);HAL_NVIC_EnableIRQ(EXTI2_3_IRQn);HAL_NVIC_ClearPendingIRQ(EXTI2_3_IRQn);HAL_NVIC_SetPriority(EXTI2_3_IRQn,1,0);delay_us(200);nIRQ=1;recv_end_flag=0;uart_rx_len=0;rx_len_tmp=0;len_var=0;rx_init();__HAL_UART_CLEAR_IDLEFLAG(&huart1);HAL_IWDG_Start(&hiwdg);//startiwdg}
spi_read_info();為讀取id函數(shù)，返回值為4463，證明通信接口正常工作。
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spi_read_info();為讀取id函數(shù)，返回值為4463，證明通信接口正常工作。
下面為大家展現(xiàn)RF具體寄存器參數(shù)配置函數(shù)，該RF芯片有各類配置寄存器一百多個(gè)，需要配置大量的參數(shù)：
void SI4463_init(void)
{
U8 app_command_buf[20];
//spi_write(0x07, RF_GPIO_PIN_CFG_data);
app_command_buf[0] = 0x13; // SET GPIO PORT
app_command_buf[1] = 0x14; // gpio 0 ,Rx data
app_command_buf[2] = 0x02; // gpio1, output 0
app_command_buf[3] = 0x21; // gpio2, hign while in receive mode
app_command_buf[4] = 0x20; // gpio3, hign while in transmit mode
app_command_buf[5] = 0x27; // nIRQ
app_command_buf[6] = 0x0b; // sdo
spi_write(7, app_command_buf);
// spi_write(0x05, RF_GLOBAL_XO_TUNE_1_data);
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x00;
app_command_buf[2] = 0x01;
app_command_buf[3] = 0x00;
app_command_buf[4] = 125; // freq adjustment
spi_write(5, app_command_buf);
// spi_write(0x05, RF_GLOBAL_CONFIG_1_data);
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x00;
app_command_buf[2] = 0x01;
app_command_buf[3] = 0x03;
app_command_buf[4] = 0x40; // tx = rx = 64 byte,PH,high performance mode
spi_write(5, app_command_buf);
spi_write(0x08, (unsigned char *)RF_FRR_CTL_A_MODE_4_data); // disable all fast response register
// spi_write(0x0D, RF_PREAMBLE_TX_LENGTH_9_data); // set Preamble
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x10;
app_command_buf[2] = 0x09;
app_command_buf[3] = 0x00;
app_command_buf[4] = 0x08; // 8 bytes Preamble
app_command_buf[5] = 0x14; // detect 20 bits
app_command_buf[6] = 0x00;
app_command_buf[7] = 0x0f;
app_command_buf[8] = 0x31; // no manchest.1010.??
app_command_buf[9] = 0x00;
app_command_buf[10] = 0x00;
app_command_buf[11] = 0x00;
app_command_buf[12] = 0x00;
spi_write(13, app_command_buf);
// RF_SYNC_CONFIG_5_data, // set sync
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x11;
app_command_buf[2] = 0x05;
app_command_buf[3] = 0x00;
app_command_buf[4] = 0x01; // no manchest , 2 bytes
app_command_buf[5] = 0x2d; // sync byte3
app_command_buf[6] = 0xd4; // sync byte2
app_command_buf[7] = 0x00; // sync byte1
app_command_buf[8] = 0x00; // sync byte0
spi_write(9, app_command_buf);
// packet crc
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x12;
app_command_buf[2] = 0x01;
app_command_buf[3] = 0x00;
app_command_buf[4] = 0x81; // CRC = itu-c, enable crc
spi_write(5, app_command_buf);
// packet gernale configuration
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x12;
app_command_buf[2] = 0x01;
app_command_buf[3] = 0x06;
app_command_buf[4] = 0x02; // CRC MSB, data MSB
spi_write(5, app_command_buf);
// spi_write(0x07, RF_PKT_LEN_3_data);
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x12;
app_command_buf[2] = 0x03;
app_command_buf[3] = 0x08;
app_command_buf[4] = 0x0a;
app_command_buf[5] = 0x01;
app_command_buf[6] = 0x00;
spi_write(7, app_command_buf);
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x12;
app_command_buf[2] = 0x0c;
app_command_buf[3] = 0x0d;
app_command_buf[4] = 0x00;
app_command_buf[5] = 0x05;
app_command_buf[6] = 0x04;
app_command_buf[7] = 0xaa;
app_command_buf[8] = 0x00;
app_command_buf[9] = payload_length;
app_command_buf[10] = 0x00;
app_command_buf[11] = 0xaa;
app_command_buf[12] = 0x00;
app_command_buf[13] = 0x00;
app_command_buf[14] = 0x00;
app_command_buf[15] = 0x00;
spi_write(16, app_command_buf); // set length of Field 1 -- 4
// spi_write(0x0C, RF_PKT_FIELD_4_LENGTH_12_8_8_data);
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x12;
app_command_buf[2] = 0x08;
app_command_buf[3] = 0x19;
app_command_buf[4] = 0x00;
app_command_buf[5] = 0x00;
app_command_buf[6] = 0x00;
app_command_buf[7] = 0x00;
app_command_buf[8] = 0x00;
app_command_buf[9] = 0x00;
app_command_buf[10] = 0x00;
app_command_buf[11] = 0x00;
spi_write(12, app_command_buf);
spi_write(0x10, (unsigned char *)RF_MODEM_MOD_TYPE_12_data);
spi_write(0x05, (unsigned char *)RF_MODEM_FREQ_DEV_0_1_data);
spi_write(0x10, (unsigned char *)RF_MODEM_TX_RAMP_DELAY_12_data);
spi_write(0x10, (unsigned char *)BCR_NCO_OFFSET_2_12_data);
spi_write(0x10, (unsigned char *)RF_MODEM_TX_RAMP_DELAY_12_data);
spi_write(0x07, (unsigned char *)RF_MODEM_AFC_LIMITER_1_3_data);
//spi_write(0x10, BCR_NCO_OFFSET_2_12_data);
spi_write(0x05, (unsigned char *)RF_MODEM_AGC_CONTROL_1_data);
spi_write(0x10, (unsigned char *)AGC_WINDOW_SIZE_12_data);
spi_write(0x0c, (unsigned char *)RF_MODEM_RAW_CONTROL_8_data);
// spi_write(0x10, (unsigned char *)AGC_WINDOW_SIZE_12_data);
// spi_write(0x05, RF_MODEM_RSSI_COMP_1_data);
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x20;
app_command_buf[2] = 0x01;
app_command_buf[3] = 0x4e;
app_command_buf[4] = 0x40;
spi_write(5, app_command_buf);
spi_write(0x10, (unsigned char *)COE13_7_0_12_data);
spi_write(0x10, (unsigned char *)COE1_7_0_12_data);
spi_write(0x10, (unsigned char *)COE7_7_0_12_data);
// RF_PA
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x22;
app_command_buf[2] = 0x04;
app_command_buf[3] = 0x00;
app_command_buf[4] = 0x08;
app_command_buf[5] = POWER; // set max power
app_command_buf[6] =0x00;
app_command_buf[7] = 0x3d;
spi_write(8, app_command_buf);
spi_write(0x0B, (unsigned char *)RF_SYNTH_PFDCP_CPFF_7_data);
// header match
app_command_buf[0] = 0x11;
app_command_buf[1] = 0x30;
app_command_buf[2] = 0x0c;
app_command_buf[3] = 0x00;
app_command_buf[4] = rf_id[0];
app_command_buf[5] = 0xff;
app_command_buf[6] = 0x40;
app_command_buf[7] = rf_id[1];
app_command_buf[8] = 0xff;
app_command_buf[9] = 0x01;
app_command_buf[10] = rf_id[2];
app_command_buf[11] =0xff;
app_command_buf[12] =0x02;
app_command_buf[13] = rf_id[3];
app_command_buf[14] = 0xff;
app_command_buf[15] =0x03;
spi_write(16, app_command_buf); // ????í·??
spi_write(6, (unsigned char *)RF_MODEM_RAW_SEARCH2_2_data);
// RF_FREQ_CONTROL_INTE_8_data[5] =uRF_FREQ_CONTROL[0];
// RF_FREQ_CONTROL_INTE_8_data[6] =uRF_FREQ_CONTROL[1];
// RF_FREQ_CONTROL_INTE_8_data[7] =uRF_FREQ_CONTROL[2];
spi_write(12, (unsigned char *)RF_FREQ_CONTROL_INTE_8_data); // set frequency
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下面為大家展現(xiàn)RF具體寄存器參數(shù)配置函數(shù)，該RF芯片有各類配置寄存器一百多個(gè)，需要配置大量的參數(shù)：voidSI4463_init(void){U8app_command_buf[20];//spi_write(0x07,RF_GPIO_PIN_CFG_data);app_command_buf[0]=0x13;//SETGPIOPORTapp_command_buf[1]=0x14;//gpio0,Rxdataapp_command_buf[2]=0x02;//gpio1,output0app_command_buf[3]=0x21;//gpio2,hignwhileinreceivemodeapp_command_buf[4]=0x20;//gpio3,hignwhileintransmitmodeapp_command_buf[5]=0x27;//nIRQapp_command_buf[6]=0x0b;//sdospi_write(7,app_command_buf);//spi_write(0x05,RF_GLOBAL_XO_TUNE_1_data);app_command_buf[0]=0x11;app_command_buf[1]=0x00;app_command_buf[2]=0x01;app_command_buf[3]=0x00;app_command_buf[4]=125;//freqadjustmentspi_write(5,app_command_buf);//spi_write(0x05,RF_GLOBAL_CONFIG_1_data);app_command_buf[0]=0x11;app_command_buf[1]=0x00;app_command_buf[2]=0x01;app_command_buf[3]=0x03;app_command_buf[4]=0x40;//tx=rx=64byte,PH,highperformancemodespi_write(5,app_command_buf);spi_write(0x08,(unsignedchar*)RF_FRR_CTL_A_MODE_4_data);//disableallfastresponseregister//spi_write(0x0D,RF_PREAMBLE_TX_LENGTH_9_data);//setPreambleapp_command_buf[0]=0x11;app_command_buf[1]=0x10;app_command_buf[2]=0x09;app_command_buf[3]=0x00;app_command_buf[4]=0x08;//8bytesPreambleapp_command_buf[5]=0x14;//detect20bitsapp_command_buf[6]=0x00;app_command_buf[7]=0x0f;app_command_buf[8]=0x31;//nomanchest.1010.??app_command_buf[9]=0x00;app_command_buf[10]=0x00;app_command_buf[11]=0x00;app_command_buf[12]=0x00;spi_write(13,app_command_buf);//RF_SYNC_CONFIG_5_data,//setsyncapp_command_buf[0]=0x11;app_command_buf[1]=0x11;app_command_buf[2]=0x05;app_command_buf[3]=0x00;app_command_buf[4]=0x01;//nomanchest,2bytesapp_command_buf[5]=0x2d;//syncbyte3app_command_buf[6]=0xd4;//syncbyte2app_command_buf[7]=0x00;//syncbyte1app_command_buf[8]=0x00;//syncbyte0spi_write(9,app_command_buf);//packetcrcapp_command_buf[0]=0x11;app_command_buf[1]=0x12;app_command_buf[2]=0x01;app_command_buf[3]=0x00;app_command_buf[4]=0x81;//CRC=itu-c,enablecrcspi_write(5,app_command_buf);//packetgernaleconfigurationapp_command_buf[0]=0x11;app_command_buf[1]=0x12;app_command_buf[2]=0x01;app_command_buf[3]=0x06;app_command_buf[4]=0x02;//CRCMSB,dataMSBspi_write(5,app_command_buf);//spi_write(0x07,RF_PKT_LEN_3_data);app_command_buf[0]=0x11;app_command_buf[1]=0x12;app_command_buf[2]=0x03;app_command_buf[3]=0x08;app_command_buf[4]=0x0a;app_command_buf[5]=0x01;app_command_buf[6]=0x00;spi_write(7,app_command_buf);app_command_buf[0]=0x11;app_command_buf[1]=0x12;app_command_buf[2]=0x0c;app_command_buf[3]=0x0d;app_command_buf[4]=0x00;app_command_buf[5]=0x05;app_command_buf[6]=0x04;app_command_buf[7]=0xaa;app_command_buf[8]=0x00;app_command_buf[9]=payload_length;app_command_buf[10]=0x00;app_command_buf[11]=0xaa;app_command_buf[12]=0x00;app_command_buf[13]=0x00;app_command_buf[14]=0x00;app_command_buf[15]=0x00;spi_write(16,app_command_buf);//setlengthofField1--4//spi_write(0x0C,RF_PKT_FIELD_4_LENGTH_12_8_8_data);app_command_buf[0]=0x11;app_command_buf[1]=0x12;app_command_buf[2]=0x08;app_command_buf[3]=0x19;app_command_buf[4]=0x00;app_command_buf[5]=0x00;app_command_buf[6]=0x00;app_command_buf[7]=0x00;app_command_buf[8]=0x00;app_command_buf[9]=0x00;app_command_buf[10]=0x00;app_command_buf[11]=0x00;spi_write(12,app_command_buf);spi_write(0x10,(unsignedchar*)RF_MODEM_MOD_TYPE_12_data);spi_write(0x05,(unsignedchar*)RF_MODEM_FREQ_DEV_0_1_data);spi_write(0x10,(unsignedchar*)RF_MODEM_TX_RAMP_DELAY_12_data);spi_write(0x10,(unsignedchar*)BCR_NCO_OFFSET_2_12_data);spi_write(0x10,(unsignedchar*)RF_MODEM_TX_RAMP_DELAY_12_data);spi_write(0x07,(unsignedchar*)RF_MODEM_AFC_LIMITER_1_3_data);//spi_write(0x10,BCR_NCO_OFFSET_2_12_data);spi_write(0x05,(unsignedchar*)RF_MODEM_AGC_CONTROL_1_data);spi_write(0x10,(unsignedchar*)AGC_WINDOW_SIZE_12_data);spi_write(0x0c,(unsignedchar*)RF_MODEM_RAW_CONTROL_8_data);//spi_write(0x10,(unsignedchar*)AGC_WINDOW_SIZE_12_data);//spi_write(0x05,RF_MODEM_RSSI_COMP_1_data);app_command_buf[0]=0x11;app_command_buf[1]=0x20;app_command_buf[2]=0x01;app_command_buf[3]=0x4e;app_command_buf[4]=0x40;spi_write(5,app_command_buf);spi_write(0x10,(unsignedchar*)COE13_7_0_12_data);spi_write(0x10,(unsignedchar*)COE1_7_0_12_data);spi_write(0x10,(unsignedchar*)COE7_7_0_12_data);//RF_PAapp_command_buf[0]=0x11;app_command_buf[1]=0x22;app_command_buf[2]=0x04;app_command_buf[3]=0x00;app_command_buf[4]=0x08;app_command_buf[5]=POWER;//setmaxpowerapp_command_buf[6]=0x00;app_command_buf[7]=0x3d;spi_write(8,app_command_buf);spi_write(0x0B,(unsignedchar*)RF_SYNTH_PFDCP_CPFF_7_data);//headermatchapp_command_buf[0]=0x11;app_command_buf[1]=0x30;app_command_buf[2]=0x0c;app_command_buf[3]=0x00;app_command_buf[4]=rf_id[0];app_command_buf[5]=0xff;app_command_buf[6]=0x40;app_command_buf[7]=rf_id[1];app_command_buf[8]=0xff;app_command_buf[9]=0x01;app_command_buf[10]=rf_id[2];app_command_buf[11]=0xff;app_command_buf[12]=0x02;app_command_buf[13]=rf_id[3];app_command_buf[14]=0xff;app_command_buf[15]=0x03;spi_write(16,app_command_buf);//????í·??spi_write(6,(unsignedchar*)RF_MODEM_RAW_SEARCH2_2_data);//RF_FREQ_CONTROL_INTE_8_data[5]=uRF_FREQ_CONTROL[0];//RF_FREQ_CONTROL_INTE_8_data[6]=uRF_FREQ_CONTROL[1];//RF_FREQ_CONTROL_INTE_8_data[7]=uRF_FREQ_CONTROL[2];spi_write(12,(unsignedchar*)RF_FREQ_CONTROL_INTE_8_data);//setfrequency}
系統(tǒng)整個(gè)工作流程大概如下：
首先配置好RF收發(fā)器，使其可以正常收發(fā)數(shù)據(jù)，這包括寄存器參數(shù)配置，設(shè)備ID、中心頻率、空中傳輸速度、中斷等等配置
然后用戶通過串口發(fā)送數(shù)據(jù)時(shí)，系統(tǒng)在DMA的控制下直接將數(shù)據(jù)存入指定發(fā)送緩沖區(qū)，并且將發(fā)送標(biāo)志位置位，此時(shí)無線收發(fā)系統(tǒng)RF檢測到有數(shù)據(jù)要發(fā)送，便會(huì)啟動(dòng)發(fā)送數(shù)據(jù)，當(dāng)RF發(fā)送數(shù)據(jù)完成后，通過中斷通知CPU數(shù)據(jù)發(fā)送完成。需要注意的是RF每次最多發(fā)送64字節(jié) 數(shù)據(jù)，當(dāng)待發(fā)送數(shù)據(jù)超過64字節(jié)時(shí)，系統(tǒng)會(huì)自動(dòng)拆包處理，接收數(shù)據(jù)過程與發(fā)送數(shù)據(jù)類似，只是方向相反。
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@694844985
系統(tǒng)整個(gè)工作流程大概如下：首先配置好RF收發(fā)器，使其可以正常收發(fā)數(shù)據(jù)，這包括寄存器參數(shù)配置，設(shè)備ID、中心頻率、空中傳輸速度、中斷等等配置然后用戶通過串口發(fā)送數(shù)據(jù)時(shí)，系統(tǒng)在DMA的控制下直接將數(shù)據(jù)存入指定發(fā)送緩沖區(qū)，并且將發(fā)送標(biāo)志位置位，此時(shí)無線收發(fā)系統(tǒng)RF檢測到有數(shù)據(jù)要發(fā)送，便會(huì)啟動(dòng)發(fā)送數(shù)據(jù)，當(dāng)RF發(fā)送數(shù)據(jù)完成后，通過中斷通知CPU數(shù)據(jù)發(fā)送完成。需要注意的是RF每次最多發(fā)送64字節(jié)數(shù)據(jù)，當(dāng)待發(fā)送數(shù)據(jù)超過64字節(jié)時(shí)，系統(tǒng)會(huì)自動(dòng)拆包處理，接收數(shù)據(jù)過程與發(fā)送數(shù)據(jù)類似，只是方向相反。
下面上一個(gè)完整的測試工程源碼RF_0913_F042F6P6_ID.rar，有興趣的可以研究一下
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@694844985
本來打算等樣片到了再繼續(xù)搞，過一段時(shí)間會(huì)比較忙，所以不等樣片了，先搞起來了，本來可以做2層板的，但是由于體積限制，板子空間太小，被迫做了4層PCB，好在目前的4層PCB的成本也不高，上PCB圖，板子尺寸：30*15mm[圖片]PCB布局圖（頂層）[圖片]PCB布局圖（底層）[圖片]頂層布線，射頻進(jìn)行了50歐姆阻抗控制，保證信號(hào)的完整性。對(duì)射頻電路進(jìn)行了合理的規(guī)劃布局。[圖片]中間層[圖片]中間層（電源層）[圖片]底層布線[圖片]
這部分的參數(shù)匹配很重要，很多設(shè)計(jì)距離達(dá)不到都是這個(gè)參數(shù)沒有匹配好
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