ADS1299EEG FE Rev A與MSP432P401R的SPI傳輸

我是SPI 的初學者，看到官方CCS的範例都是SPI的3線傳輸的範例。

請問ADS1299EEG FE Rev A與MSP432P401R的SPI傳輸是不是只能使用4線傳輸?

他們之間的SPI傳輸又該如何撰寫?

有什麼方式可以讓我更快入手的嗎?

Susan Yang：

您可以看一下ADS1229的数据手册内的说明 www.ti.com/…/ads1299.pdf

The SPI-compatible serial interface consists of four signals: CS, SCLK, DIN, and DOUT.

使用的是4线的SPI

关于MSP432的SPI例程，您可以下载 www.ti.com/…/SIMPLELINK-MSP432-SDK

后在其安装文件夹内找到

<SDK_INSTALL_DIR>\examples\rtos\MSP_EXP432P401R\drivers\spimaster

4线SPI的话可以使用 SPI_selectFourPinFunctionality来使能

user5121970：

回复 Susan Yang:

SPI_selectFourPinFunctionality  這個如何使用?

可以舉例說明一下嗎?

Susan Yang：

回复 user5121970:

您可以参考一下下面的链接，有详细的函数说明

dev.ti.com/…/group__spi__api.html

user5121970：

回复 Susan Yang:

我現在使用兩塊MSP432P401R，我想設定成4線傳輸，並且要讓MASTER接收SLAVE傳送來的資料，可是我不知道我的錯誤在哪，CLOCK沒有任何訊號，我的代碼如下：

MASTER：
/* DriverLib Includes */
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>

/* Standard Includes */
#include <stdint.h>
#include <stdbool.h>

/* Statics */
//static volatile uint8_t RXData = 0;
//static uint8_t TXData = 0;
static volatile uint8_t transmitData = 0x01, receiveData = 0x00;
//![Simple SPI Config]
/* SPI Master Configuration Parameter */
const eUSCI_SPI_MasterConfig spiMasterConfig =
{EUSCI_B_SPI_CLOCKSOURCE_SMCLK,// SMCLK Clock Source3000000,// SMCLK = DCO = 3MHZ500000,// *** = 500khzEUSCI_B_SPI_MSB_FIRST,// MSB FirstEUSCI_B_SPI_PHASE_DATA_CHANGED_ONFIRST_CAPTURED_ON_NEXT,// PhaseEUSCI_B_SPI_CLOCKPOLARITY_INACTIVITY_HIGH, // High polarity//EUSCI_B_SPI_3PIN// 3Wire SPI ModeEUSCI_B_SPI_4PIN_UCxSTE_ACTIVE_HIGH// 4Wire SPI Mode
};
//![Simple SPI Config]

int main(void)
{/* Halting WDT*/WDT_A_holdTimer();
//![Simple SPI Example]/* Selecting P1.5 P1.6 and P1.7 in SPI mode */GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1,GPIO_PIN5 | GPIO_PIN6 | GPIO_PIN7, GPIO_PRIMARY_MODULE_FUNCTION);
//GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5,
//GPIO_PIN2,GPIO_PRIMARY_MODULE_FUNCTION);
//CSGPIO_setAsOutputPin(GPIO_PORT_P4,GPIO_PIN3);GPIO_setOutputHighOnPin(GPIO_PORT_P4,GPIO_PIN3);//CS
/* Configuring SPI in 3wire master mode */SPI_initMaster(EUSCI_B0_BASE, &spiMasterConfig);
/* Enable SPI module */SPI_enableModule(EUSCI_B0_BASE);
/* Enabling interrupts */SPI_enableInterrupt(EUSCI_B0_BASE, EUSCI_B_SPI_RECEIVE_INTERRUPT);Interrupt_enableSleepOnIsrExit();Interrupt_enableInterrupt(INT_EUSCIB0);
//![Simple SPI Example]//TXData = 0x01;GPIO_setOutputLowOnPin(GPIO_PORT_P4,GPIO_PIN3);/* Polling to see if the TX buffer is ready */while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_RECEIVE_INTERRUPT)));
/* Transmitting data to slave *///SPI_transmitData(EUSCI_B0_BASE, TXData);GPIO_setOutputHighOnPin(GPIO_PORT_P4,GPIO_PIN3);//Interrupt_enableMaster（）;PCM_gotoLPM0();__no_operation();
}

//******************************************************************************
//
//This is the EUSCI_B0 interrupt vector service routine.
//
//******************************************************************************
void EUSCIB0_IRQHandler(void)
{//uint32_t status = SPI_getEnabledInterruptStatus(EUSCI_B0_BASE);//uint32_t jj;
uint32_t status;
status = SPI_getEnabledInterruptStatus(EUSCI_B0_BASE);

SPI_clearInterruptFlag(EUSCI_B0_BASE, status);
if(status & EUSCI_B_SPI_RECEIVE_INTERRUPT){/* USCI_B0 TX buffer ready? */while (!(SPI_getInterruptStatus(EUSCI_B0_BASE, EUSCI_B_SPI_TRANSMIT_INTERRUPT)));//GPIO_setOutputLowOnPin(GPIO_PORT_P5,GPIO_PIN2);//RXData = SPI_receiveData(EUSCI_B0_BASE);
/* Send the next data packet *///SPI_transmitData(EUSCI_B0_BASE, ++TXData);//SPI_transmitData(EUSCI_B0_BASE, transmitData++);
/* Delay between transmissions for slave to process information *///for(jj=50;jj<50;jj++);receiveData = SPI_receiveData(EUSCI_B0_BASE);//GPIO_setOutputHighOnPin(GPIO_PORT_P5,GPIO_PIN2);}

}

SLAVE：
/* DriverLib Includes */
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>

/* Statics */
//static volatile uint8_t transmitData = 0x01, receiveData = 0x00;
static volatile uint8_t RXData = 0;
static uint8_t TXData = 0;
/* SPI Slave Configuration Parameter */
const eUSCI_SPI_SlaveConfig spiSlaveConfig =
{EUSCI_B_SPI_MSB_FIRST,// MSB FirstEUSCI_B_SPI_PHASE_DATA_CHANGED_ONFIRST_CAPTURED_ON_NEXT,// PhaseEUSCI_B_SPI_CLOCKPOLARITY_INACTIVITY_HIGH,// Normal Polarity//EUSCI_B_SPI_3PIN// 3wire modeEUSCI_B_SPI_4PIN_UCxSTE_ACTIVE_HIGH, // 4線SPI模式

};

int main(void)
{/* Stop watchdog timer */WDT_A_holdTimer();
/* Selecting P1.1 P1.2 and P1.3 in SPI mode */GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1,GPIO_PIN5 | GPIO_PIN6 | GPIO_PIN7, GPIO_PRIMARY_MODULE_FUNCTION);//GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5,//GPIO_PIN2,SPI_selectFourPinFunctionality );
//CSGPIO_setAsOutputPin(GPIO_PORT_P4,GPIO_PIN3);GPIO_setOutputHighOnPin(GPIO_PORT_P4,GPIO_PIN3);
//CS/* Initialize slave to MSB first, inactive high clock polarity and* 3 wire SPI */SPI_initSlave(EUSCI_B0_BASE, &spiSlaveConfig);
/* Enable the SPI module */SPI_enableModule(EUSCI_B0_BASE);
/* Enable Receive interrupt */SPI_enableInterrupt(EUSCI_B0_BASE, EUSCI_B_SPI_RECEIVE_INTERRUPT);Interrupt_enableSleepOnIsrExit();Interrupt_enableInterrupt(INT_EUSCIB0);
//![Simple SPI Example]GPIO_setOutputLowOnPin(GPIO_PORT_P4,GPIO_PIN3);TXData = 0x01;
/* Polling to see if the TX buffer is ready */while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
/* Transmitting data to slave */SPI_transmitData(EUSCI_B0_BASE, TXData);
Interrupt_enableMaster();GPIO_setOutputHighOnPin(GPIO_PORT_P4,GPIO_PIN3);PCM_gotoLPM0();__no_operation();

}

//******************************************************************************
//
//This is the EUSCI_B0 interrupt vector service routine.
//
//******************************************************************************
void EUSCIB0_IRQHandler(void)
{//uint32_t status;uint32_t status = SPI_getEnabledInterruptStatus(EUSCI_B0_BASE);uint32_t jj;
//status = SPI_getEnabledInterruptStatus(EUSCI_B0_BASE);//SPI_clearInterruptFlag(EUSCI_B0_BASE, status);
if(status & EUSCI_B_SPI_RECEIVE_INTERRUPT){/* USCI_B0 TX buffer ready? */while (!(SPI_getInterruptStatus(EUSCI_B0_BASE, EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
//RXData = SPI_receiveData(EUSCI_B0_BASE);/* Transmit data to master *///SPI_transmitData(EUSCI_B0_BASE, transmitData++);SPI_transmitData(EUSCI_B0_BASE, ++TXData);
//Receive data from master//receiveData = SPI_receiveData(EUSCI_B0_BASE);for(jj=50;jj<50;jj++);
}
}

xyz549040622：

回复 user5121970:

代码太长，就不一一看了，CLOCK沒有任何訊號，说明你的SPI外设没有初始化完成，你是否用官方的代码例程进行了测试呢？这样可以找到你代码的错误在哪里。

user5121970：

回复 xyz549040622:

範例程式碼主要是MSTER發送資料給SLAVE
我的代碼是將SLAVE發送資料給MASTER接收
我只有將兩個官方範例代碼乎鄉修改而已
我最後的目的是要MASTER接收SLAVE傳送的資料