[问答]

为什么无法编译ESP8266上的SPI？

问答对人有帮助，内容完整，我也想知道答案 0 我得到了一些代码，我知道这些代码对为我做测试项目的编码员有用（我无法向他们寻求额外帮助）。该项目是让 ESP8266 作为 SPI 从设备运行。测试代码除了证明 Slave 和 Master 之间可以进行通信外，不做任何事。我相信编码员一定使用了他发现的现有代码，因为我在其他地方找到了对它的单一引用，但不是我遇到的问题。我遇到的问题是，当我编译代码时，出现以下错误： “ SERCOM1 ”未在此范围内声明挣扎。完整的草图是：代码：全选 #include const int slaveAPin = 10; //SERCOM1 10; // SERCOM4 16; static int sendCounter = 0; static int cmd = 0; void setup() { Serial.begin(9600); pinMode(slaveAPin, INPUT_PULLUP); attachInterrupt(10, SERCOM1_Handler, FALLING); spiSlave_init(); SERCOM1->SPI.DATA.reg = 0x12; } void loop() { //waste some time in a loop int var = 0; while(var < 200){ var++; } } void SERCOM1_Handler() { Serial.println("In SPI Interrupt Handler"); uint8_t data = 0; uint8_t junk = 0; data =(uint8_t)SERCOM1->SPI.DATA.reg; SERCOM1->SPI.DATA.reg = 0x12; uint8_t interrupts = SERCOM1->SPI.INTFLAG.reg; //Read SPI interrupt register Serial.print("Interrupts: "); Serial.println(interrupts); // If error interrupt then clear down and ignore if(interrupts & (1<<7)) { Serial.println("Error Interrupt"); SERCOM1->SPI.INTFLAG.bit.ERROR = 1; return; } if(interrupts & (1<<3)) { Serial.println("SPI SSL Interupt"); SERCOM1->SPI.INTFLAG.bit.SSL = 1; //clear slave select interrupt } if(interrupts & (1<<2)) { Serial.println("SPI Data Receive Complete Interrupt"); Serial.print("B4 RXC flag cleared:"); Serial.println(SERCOM1->SPI.INTFLAG.bit.RXC); // Reading the DATA should clear the flag while( SERCOM1->SPI.INTFLAG.bit.RXC != 0) { //data = SERCOM1->SPI.DATA.bit.DATA; //eat up junk = SERCOM1->SPI.DATA.reg; //Read data register } Serial.print("After RXC flag cleared:"); Serial.println(SERCOM1->SPI.INTFLAG.bit.RXC); // Below should have no affect according to docs //SERCOM1->SPI.INTFLAG.bit.RXC = 1; //clear receive complete interrupt } if(interrupts & (1<<1)) { Serial.println("SPI Data Transmit Complete Interrupt. SSH"); SERCOM1->SPI.INTFLAG.bit.TXC = 1; //clear receive complete interrupt } if(interrupts & (1<<0)) { Serial.println("SPI Data Register Empty Interrupt. Ready for new data to transmit"); SERCOM1->SPI.DATA.reg = 0x12; } Serial.print("DATA: "); Serial.println(data); //Serial.print("CTRLA: "); Serial.println(SERCOM1->SPI.CTRLA.reg); } void spiSlave_init() { //Configure SERCOM1 SPI PINS //PORTA.DIR.reg &= ~PORT_PA16; //Set PA16 as input (MOSI) //PORTA.DIR.reg &= ~PORT_PA17; //Set PA17 as input (SCK) //PORTA.DIR.reg &= ~PORT_PA18; //Set PA18 as input (SS) //PORTA.DIR.reg \|= PORT_PA19; //Set PA19 as output (MISO) /* PORTA.PINCFG[16].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM1 SPI PA18 Arduino PIN10 PORTA.PMUX[8].bit.PMUXE = 0x2; //SERCOM 1 is selected for peripherial use of this pad PORTA.PINCFG[17].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM1 SPI PA18 Arduino PIN10 PORTA.PMUX[8].bit.PMUXO = 0x2; //SERCOM 1 is selected for peripherial use of this pad PORTA.PINCFG[18].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM1 SPI PA18 Arduino PIN10 PORTA.PMUX[9].bit.PMUXE = 0x2; //SERCOM 1 is selected for peripherial use of this pad PORTA.PINCFG[19].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM1 SPI PA18 Arduino PIN10 PORTA.PMUX[9].bit.PMUXO = 0x2; //SERCOM 1 is selected for peripherial use of this pad / PORT->Group[PORTA].PINCFG[16].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM1 SPI PA18 Arduino PIN10 PORT->Group[PORTA].PMUX[8].bit.PMUXE = 0x2; //SERCOM 1 is selected for peripherial use of this pad PORT->Group[PORTA].PINCFG[17].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM1 SPI PA18 Arduino PIN10 PORT->Group[PORTA].PMUX[8].bit.PMUXO = 0x2; //SERCOM 1 is selected for peripherial use of this pad PORT->Group[PORTA].PINCFG[18].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM1 SPI PA18 Arduino PIN10 PORT->Group[PORTA].PMUX[9].bit.PMUXE = 0x2; //SERCOM 1 is selected for peripherial use of this pad PORT->Group[PORTA].PINCFG[19].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM1 SPI PA18 Arduino PIN10 PORT->Group[PORTA].PMUX[9].bit.PMUXO = 0x2; //SERCOM 1 is selected for peripherial use of this pad //Disable SPI 1 SERCOM1->SPI.CTRLA.bit.ENABLE =0; while(SERCOM1->SPI.SYNCBUSY.bit.ENABLE); //Reset SPI 1 SERCOM1->SPI.CTRLA.bit.SWRST = 1; while(SERCOM1->SPI.CTRLA.bit.SWRST \|\| SERCOM1->SPI.SYNCBUSY.bit.SWRST); //Setting up NVIC NVIC_EnableIRQ(SERCOM1_IRQn); NVIC_SetPriority(SERCOM1_IRQn,2); //Setting Generic Clock Controller!!!! GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID(GCM_SERCOM1_CORE) \| //Generic Clock 0 GCLK_CLKCTRL_GEN_GCLK0 \| // Generic Clock Generator 0 is the source GCLK_CLKCTRL_CLKEN; // Enable Generic Clock Generator while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY); //Wait for synchronisation //Set up SPI Control A Register SERCOM1->SPI.CTRLA.bit.DORD = 0; //MSB first SERCOM1->SPI.CTRLA.bit.CPOL = 0; //SCK is low when idle, leading edge is rising edge SERCOM1->SPI.CTRLA.bit.CPHA = 0; //data sampled on leading sck edge and changed on a trailing sck edge SERCOM1->SPI.CTRLA.bit.FORM = 0x0; //Frame format = SPI SERCOM1->SPI.CTRLA.bit.DIPO = 0x0; //DATA PAD0 MOSI is used as input (slave mode) SERCOM1->SPI.CTRLA.bit.DOPO = 0x2; //DATA PAD3 MISO is used as output SERCOM1->SPI.CTRLA.bit.MODE = 0x2; //SPI in Slave mode SERCOM1->SPI.CTRLA.bit.IBON = 0x1; //Buffer Overflow notification SERCOM1->SPI.CTRLA.bit.RUNSTDBY = 1; //wake on receiver complete //Set up SPI control B register //SERCOM1->SPI.CTRLB.bit.RXEN = 0x1; //Enable Receiver SERCOM1->SPI.CTRLB.bit.SSDE = 0x1; //Slave Selecte Detection Enabled SERCOM1->SPI.CTRLB.bit.CHSIZE = 0; //character size 8 Bit //SERCOM1->SPI.CTRLB.bit.PLOADEN = 0x1; //Enable Preload Data Register //while (SERCOM1->SPI.SYNCBUSY.bit.CTRLB); //Set up SPI interrupts SERCOM1->SPI.INTENSET.bit.SSL = 0x1; //Enable Slave Select low interrupt SERCOM1->SPI.INTENSET.bit.RXC = 0x1; //Receive complete interrupt SERCOM1->SPI.INTENSET.bit.TXC = 0x1; //Transmit complete interrupt SERCOM1->SPI.INTENSET.bit.ERROR = 0x1; //Error interrupt SERCOM1->SPI.INTENSET.bit.DRE = 0x1; //Data Register Empty interrupt //init SPI CLK //SERCOM1->SPI.BAUD.reg = SERCOM_FREQ_REF / (24000000u)-1; //Enable SPI SERCOM1->SPI.CTRLA.bit.ENABLE = 1; while(SERCOM1->SPI.SYNCBUSY.bit.ENABLE); SERCOM1->SPI.CTRLB.bit.RXEN = 0x1; //Enable Receiver, this is done here due to errate issue while(SERCOM1->SPI.SYNCBUSY.bit.CTRLB); //wait until receiver is enabled } 0
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