【正点原子STM32探索者V3开发板体验】SPI&外部中断实验&移植SX1278驱动

donatello1996

2023-5-8 01:18:03 330

0 4 STM32F407的SPI1外设可以提供高达84MHz的时钟控制，可以应用到绝大部分的SPI项目中，因为在实际应用中，像W5500模块，SX1278 LORA模块，都不需要用到这么高的时钟，一般是0.5MHz左右的速率就够了，再快就反应不过来，SPI1在256分频下的波形如下： uint8_t SPI1_Read_Write_Byte(uint8_t txdata) { while ((SPI1->SR & SPI_FLAG_TXE) == 0); SPI1->DR = txdata; while ((SPI1->SR & SPI_FLAG_RXNE) == 0); return SPI1->DR; } while(1) { SPI1_Read_Write_Byte(0xab); Delay_ms(1); } 复制代码然后是SX1278驱动的移植： typedef struct sLoRaSettings { uint32_t RFFrequency; int8_t Power; uint8_t SignalBw; uint8_t SpreadingFactor; uint8_t ErrorCoding; bool CrcOn; bool ImplicitHeaderOn; bool RxSingleOn; bool FreqHopOn; uint8_t HopPeriod; uint32_t TxPacketTimeout; uint32_t RxPacketTimeout; uint8_t PayloadLength; }tLoRaSettings; tLoRaSettings LoRaSettings = { 400000000, 20, 8, // BW [0:7.8kHz, 1:10.4kHz, 2:15.6kHz, 3:20.8kHz, 4:31.2kHz, 5:41.6kHz, 6: 62.5kHz, 7:125kHz, 8:250kHz, 9:500kHz, other: Reserved] // 432MHZ~434MHZ 11, // SF [6:64, 7:128, 8:256, 9:512, 10:1024, 11:2048, 12:4096 chips] // 1, // [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] true, // CRC[0: OFF, 1: ON] false, // [0: OFF, 1: ON] 0, // [0: Continuous, 1 Single] 0, // FreqHopOn[0: OFF, 1: ON] 4, // HopPeriod 100000, // 1000000, // 128, // }; struct _SX1276 { uint8_t InitOK; uint8_t Busy; uint8_t RxMode; uint8_t TxMode; }xLORA; void RA02_GPIO_Init(void) { GPIO_InitTypeDef gpio_init_struct; __HAL_RCC_GPIOB_CLK_ENABLE(); gpio_init_struct.Mode = GPIO_MODE_OUTPUT_PP; gpio_init_struct.Pull = GPIO_PULLUP; gpio_init_struct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; gpio_init_struct.Pin = LORA_NSS_PIN; HAL_GPIO_Init(LORA_NSS_GPIO , &gpio_init_struct); gpio_init_struct.Pin = LORA_SPI_RESET_PIN; HAL_GPIO_Init(LORA_SPI_RESET_GPIO , &gpio_init_struct); } void SX1276_Reset(void) { LORA_SPI_RESET_GPIO ->BSRR \|= LORA_SPI_RESET_PIN << 16; Delay_ms (1); LORA_SPI_RESET_GPIO ->BSRR \|= LORA_SPI_RESET_PIN; Delay_ms (6); } void SX1276Write( uint8_t addr, uint8_t buffer, uint8_t size ) { int i = 0; LORA_NSS_LOW; SPI1_Read_Write_Byte( addr \| 0x80 ); for(i = 0 ; i < size ; i++) { SPI1_Read_Write_Byte( buffer[i] ); } LORA_NSS_HIGH; } void SX1276Read(uint8_t addr, uint8_t buffer, uint8_t size) { int i = 0; LORA_NSS_LOW; SPI1_Read_Write_Byte( addr & 0x7F ); for(i = 0; i < size; i++ ) { buffer[i] = SPI1_Read_Write_Byte(0); } LORA_NSS_HIGH; } uint8_t regTemp; void SX1276_SetOpMode( uint8_t opMode ) { SX1276Read( 0x01, ®Temp, 1 ); printf("SX1276_SetOpMode read 0x01 regTemp = 0x%x\n" , regTemp); regTemp &= 0xF8; regTemp \|= (uint8_t)opMode ; printf("SX1276_SetOpMode write 0x01 regTemp = 0x%x\n" , regTemp); SX1276Write( 0x01, ®Temp , 1 ); SX1276Read( 0x01, ®Temp, 1 ); printf("SX1276_SetOpMode read 0x01 regTemp = 0x%x\n" , regTemp); } void SX1276LoRaSetRFFrequency(uint32_t freq) { uint8_t F[3]; freq = ( uint32_t )( ( double )freq / ( double )61.03515625f ); F[0] = ( uint8_t )( ( freq >> 16 ) & 0xFF ); F[1] = ( uint8_t )( ( freq >> 8 ) & 0xFF ); F[2] = ( uint8_t )( freq & 0xFF ); printf("SX1276LoRaSetRFFrequency write 0x06 F = 0x%x 0x%x 0x%x\n" , F[0] , F[1] , F[2]); SX1276Write(0x06 , F , 3); SX1276Read(0x06 , F , 3); printf("SX1276LoRaSetRFFrequency read 0x06 F = 0x%x 0x%x 0x%x\n" , F[0] , F[1] , F[2]); } void SX1276LoRaSetErrorCoding( uint8_t value ) { SX1276Read( 0x1D, ®Temp , 1 ); regTemp = ( regTemp & 0xF1 ) \| ( value << 1 ); SX1276Write( 0x1D, ®Temp ,1 ); } void SX1276LoRaSetSpreadingFactor( uint8_t factor ) { if( factor > 12 ) factor = 12; if( factor < 6 ) factor = 6; SX1276Read (0x31, ®Temp ,1); if( factor == 6 ) regTemp = (regTemp & 0xF8) \| 5; else regTemp = (regTemp & 0xF8) \| 3; SX1276Write (0x31, ®Temp , 1); SX1276Read ( 0x1E, ®Temp , 1); regTemp = (regTemp & 0x0F) \| (factor << 4); SX1276Write (0x1E, ®Temp , 1); } void SX1276LoRaSetPacketCrcOn( bool enable ) { SX1276Read( REG_LR_MODEMCONFIG2, ®Temp ,1 ); regTemp = ( regTemp & 0xFB ) \| ( enable << 2); SX1276Write( REG_LR_MODEMCONFIG2, ®Temp , 1); } void SX1276LoRaSetSignalBandwidth(uint8_t bw) { SX1276Read( 0x1D, ®Temp , 1 ); regTemp = ( regTemp & 0x0F ) \| ( bw << 4 ); SX1276Write( 0x1D, ®Temp , 1); //LoRaSettings.SignalBw = bw; } void SX1276LoRaSetImplicitHeaderOn( bool enable ) { SX1276Read( 0x1D, ®Temp ,1 ); regTemp = ( regTemp & 0xFE) \| ( enable ); SX1276Write(0x1D, ®Temp ,1 ); } void SX1276LoRaSetLowDatarateOptimize( bool enable ) { SX1276Read( REG_LR_MODEMCONFIG3, ®Temp, 1 ); regTemp = ( regTemp & 0xF7 ) \| ( enable << 3 ); SX1276Write( REG_LR_MODEMCONFIG3, ®Temp,1 ); } void SX1276LoRaSetSymbTimeout( uint16_t value ) { uint8_t reg[2]; SX1276Read( 0x1E, reg, 2 ); reg[0] = ( reg[0] & 0xFC ) \| ( ( value >> 8 ) & ~0xFC ); reg[1] = value & 0xFF; SX1276Write( 0x1E, reg, 2); } void SX1276LoRaSetPAOutput( uint8_t outputPin ) { SX1276Read( REG_LR_PACONFIG, ®Temp ,1 ); regTemp = (regTemp & 0x7F ) \| outputPin; SX1276Write(REG_LR_PACONFIG, ®Temp, 1 ); } void Lora_RxMode() { if(xLORA.InitOK == 0) { printf("LORA\n"); return; } SX1276_SetOpMode( RFLR_OPMODE_STANDBY ); regTemp = 0; SX1276Write( REG_LR_HOPPERIOD, ®Temp , 1); regTemp = RFLR_IRQFLAGS_RXTIMEOUT \| //RFLR_IRQFLAGS_RXDONE \| //RFLR_IRQFLAGS_PAYLOADCRCERROR \| RFLR_IRQFLAGS_VALIDHEADER \| RFLR_IRQFLAGS_TXDONE \| RFLR_IRQFLAGS_CADDONE \| RFLR_IRQFLAGS_FHSSCHANGEDCHANNEL\| RFLR_IRQFLAGS_CADDETECTED; SX1276Write( REG_LR_IRQFLAGSMASK, ®Temp ,1 ); regTemp = RFLR_DIOMAPPING1_DIO0_00 \| RFLR_DIOMAPPING1_DIO1_00 \| RFLR_DIOMAPPING1_DIO2_00 \| RFLR_DIOMAPPING1_DIO3_00; SX1276Write ( 0x40, ®Temp ,1); //SX1276LR->RegFifoAddrPtr = SX1276LR->RegFifoRxBaseAddr; //sx1276_SpiWriteByte( REG_LR_FIFOADDRPTR, SX1276LR->RegFifoAddrPtr ); regTemp = 0xFF; SX1276Write(REG_LR_IRQFLAGS , ®Temp , 1); SX1276_SetOpMode( RFLR_OPMODE_RECEIVER ); xLORA.RxMode =1; } void SX1276_Init(uint32_t fre , uint8_t bw) { xLORA.InitOK = 0; LoRaSettings.RFFrequency = fre * 1000 * 1000; LoRaSettings.SpreadingFactor = 11; LoRaSettings.SignalBw = bw; SX1276_Reset(); SX1276Read(0x06, ®Temp ,1); while(regTemp != 0x6C) { printf("SX1276_Init error.\n"); Delay_ms(300); } SX1276_SetOpMode(RFLR_OPMODE_SLEEP); SX1276Read(0x01, ®Temp , 1); printf("read 0x01 regTemp = 0x%x\n" , regTemp); regTemp \|= 0x80 ; SX1276Write( 0x01, ®Temp , 1); printf("write 0x01 regTemp = 0x%x\n" , regTemp); SX1276Read (0x01, ®Temp , 1); printf("read 0x01 regTemp = 0x%x\n" , regTemp); regTemp = RFLR_LNA_GAIN_G1; printf("write 0x%x regTemp = 0x%x\n" , REG_LR_LNA , regTemp); SX1276Write ( REG_LR_LNA , ®Temp , 1); SX1276Read (REG_LR_LNA, ®Temp , 1); printf("read 0x%x regTemp = 0x%x\n" , REG_LR_LNA , regTemp); SX1276LoRaSetRFFrequency(LoRaSettings.RFFrequency); SX1276LoRaSetSpreadingFactor(LoRaSettings.SpreadingFactor); SX1276LoRaSetErrorCoding(LoRaSettings.ErrorCoding); SX1276LoRaSetPacketCrcOn(LoRaSettings.CrcOn); SX1276LoRaSetSignalBandwidth(LoRaSettings.SignalBw); SX1276LoRaSetImplicitHeaderOn(LoRaSettings.ImplicitHeaderOn ); SX1276LoRaSetSymbTimeout(0x3FF); SX1276Write( 0x22, &LoRaSettings.PayloadLength , 1 ); SX1276LoRaSetLowDatarateOptimize( true ); SX1276LoRaSetPAOutput( RFLR_PACONFIG_PASELECT_PABOOST ); regTemp = 0x87; SX1276Write(REG_LR_PADAC , ®Temp , 1); regTemp = 0x8F; SX1276Write(REG_LR_PACONFIG , ®Temp , 1); //SX1276Read (0x26, ®Temp , 1); //regTemp = (regTemp & 0xF7) \| ( 1<<3); //SX1276Write (0x26, ®Temp, 1); regTemp = 0xFF; SX1276Write(REG_LR_IRQFLAGS ,®Temp, 1); xLORA.InitOK = 1; printf("SX1276_Init OK.\n"); Lora_RxMode(); printf("SX1276 RxMode.\n"); } 复制代码非常简单，直接参考例程可，初始化打印序列如图：然后，LORA模块收发是需要检测DIO0状态的，无论是发送端还是接收端，输入方式都是上升沿事件，因此可以用外部中断检测实现，也是非常简单： #define RF_BUFFER_SIZE 256 static uint8_t RxSize; static uint8_t RxBuffer[RF_BUFFER_SIZE]; void RA02_DIO0_IRQHandler(void) { __HAL_GPIO_EXTI_CLEAR_IT(RA02_DIO0_PIN); printf("LORA_DIO0_HANDLER xLORA.TxMode = %d xLORA.RxMode = %d\n" , xLORA.TxMode , xLORA.RxMode); if(xLORA.RxMode == 1) { regTemp = 0xFF; SX1276Write( 0x12, ®Temp ,1 ); if( LoRaSettings.ImplicitHeaderOn == true ) RxSize = LoRaSettings.PayloadLength ; else SX1276Read( REG_LR_NBRXBYTES, &RxSize, 1 ); SX1276Read( REG_LR_FIFORXCURRENTADDR, ®Temp ,1); SX1276Write( REG_LR_FIFOADDRPTR, ®Temp ,1 ); SX1276Read(0, RxBuffer, RxSize ); printf("RxSize %d RxBuffer: %s\r" , RxSize , RxBuffer); } } 复制代码我这边将DIO0引脚接到PF9上，PF9接了一个板载的LED灯，可以直接通过观察灯的状态来检测DIO0状态：运行效果： 0 18.jpg (99 KB, 下载次数: 0)
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