TI中文支持网我想要利用MSP432P401R(MASTER)寫一個可以透過spi發送命令並且接收slave回傳的數據的程式碼，我的想法是指令可以透過main迴圈裡面的SPI_transmitData(EUSCI_B0_BASE, TXData);發送，假設我有5個指令，那我可以在main透過連續5行此指令，只需更換TXData變數，然後發送給slave，並在中斷處，透過RXData = SPI_receiveData(EUSCI_B0_BASE);來接收從slave回傳的資料，但根據以下的程式碼，我的clock在示波器上顯示為'3.3V的一條直線，完全沒有嬰出現的波行，我不懂發生了什麼事?麻煩給予指教謝謝!
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/******************************************************************************
* MSP432 SPI - 3-wire Master Incremented Data
*
* This example shows how SPI master talks to SPI slave using 3-wire mode.
* Incrementing data is sent by the master starting at 0x01. Received data is
* expected to be same as the previous transmission. eUSCI RX ISR is used to
* handle communication with the CPU, normally in LPM0. Because all execution* after LPM0 is in ISRs, initialization waits for DCO to stabilize against* ACLK.
*
* Note that in this example, EUSCIB0 is used for the SPI port. If the user
* wants to use EUSCIA for SPI operation, they are able to with the same APIs
* with the EUSCI_AX parameters.
*
* ACLK = ~32.768kHz, MCLK = SMCLK = DCO 3MHz
*
* Use with SPI Slave Data Echo code example.
*
*MSP432P401
*-----------------
*||
*||
*||
*|P1.6|-> Data Out (UCB0SIMO)
*||
*|P1.7|<- Data In (UCB0SOMI)
*||
*|P1.5|-> Serial Clock Out (UCB0CLK)
*******************************************************************************/
/* 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;
//![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 polarityEUSCI_B_SPI_3PIN// 3Wire 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);/* 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_enableInterrupt(INT_EUSCIB0);Interrupt_enableSleepOnIsrExit();//![Simple SPI Example]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);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;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);/* Send the next data packet *///SPI_transmitData(EUSCI_B0_BASE, ++TXData);/* Delay between transmissions for slave to process information *///for(jj=50;jj<50;jj++);}
}
Susan Yang：
您现在是想实现3线SPI通信？
那您可以参考下 C:\ti\simplelink_msp432p4_sdk_3_10_00_08\examples\nortos\MSP_EXP432P401R\registerLevel 内的
msp432p401x_euscib0_spi_09 （master）和 msp432p401x_euscib0_spi_10（slave）
能描述下您现在使用的硬件吗？
user5121970：
回复 Susan Yang:
3線通信沒錯!
硬件的部分目前是利用兩塊MSP432進行溝通，完成後，未來會改成MSP432P401R(主) ADS1299EEGFE-PDK(從)
那個範例我也有參考過，但是有些地方我不知道該如何撰寫，以下code是我利用msp432p401x_euscib0_spi_09（主）撰寫修改的，但我不知道如果我要用這個範例發送多個指令，該如何撰寫，我對於中斷函式不太了解該如何運用，/* –COPYRIGHT–,BSD_EX* Copyright (c) 2014, Texas Instruments Incorporated* All rights reserved.** Redistribution and use in source and binary forms, with or without* modification, are permitted provided that the following conditions* are met:** *Redistributions of source code must retain the above copyright*notice, this list of conditions and the following disclaimer.** *Redistributions in binary form must reproduce the above copyright*notice, this list of conditions and the following disclaimer in the*documentation and/or other materials provided with the distribution.** *Neither the name of Texas Instruments Incorporated nor the names of*its contributors may be used to endorse or promote products derived*from this software without specific prior written permission.** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.**********************************************************************************MSP432 CODE EXAMPLE DISCLAIMER** MSP432 code examples are self-contained low-level programs that typically* demonstrate a single peripheral function or device feature in a highly* concise manner. For this the code may rely on the device's power-on default* register values and settings such as the clock configuration and care must* be taken when combining code from several examples to avoid potential side* effects. Also see www.ti.com/…/mspdriverlib for an API functional* library & https://dev.ti.com/pinmux/ for a GUI approach to peripheral configuration.** –/COPYRIGHT–*/
//******************************************************************************
//MSP432P401 Demo – eUSCI_B0, SPI 3-Wire Master with clock polarity high
//
//This example can be used with msp432p401x_euscib0_spi_10.c 3-wire Slave.
//
//Description: SPI master talks to SPI slave using 3-wire mode. This example
//increments data sent by the master starting at 0x01. Received data is
//expected to be same as the previous transmission RXData = TXData – 1 if
//this example is used with msp432p401x_euscib0_spi_10.c.
//
//USCI RX ISR is used to handle communication with the CPU, normally in LPM0.
//
//MSP432P401x MasterMSP432P401x Slaves
//———————————-
///|\||/|\||
//| ||| ||
//–|RST|–|RST|
//||||
//|| Data In (UCB0SIMO) ||
//|P1.6|——————->|P1.6|
//||||
//|| Data OUT (UCB0SOMI)||
//|P1.7|<——————-|P1.7|
//||||
//|| S Clock (UCB0CLK)||
//|P1.5|——————->|P1.5|
//||||
//
//William Goh
//Texas Instruments Inc.
//June 2016 (updated) | June 2014 (created)
//Built with CCSv6.1, IAR, Keil, GCC
//******************************************************************************
#include "ti/devices/msp432p4xx/inc/msp.h"
#include <stdint.h>static uint8_t RXData = 0;
static uint8_t TXData;int main(void)
{volatile uint32_t i;uint8_t previousData;
WDT_A->CTL = WDT_A_CTL_PW |// Stop watchdog timerWDT_A_CTL_HOLD;
P1->OUT &= ~BIT0;P1->DIR |= BIT0;// Set P1.0 LED
P1->SEL0 |= BIT5 | BIT6 | BIT7;// Set P1.5, P1.6, and P1.7 as// SPI pins functionality
EUSCI_B0->CTLW0 |= EUSCI_B_CTLW0_SWRST; // Put eUSCI state machine in resetEUSCI_B0->CTLW0 = EUSCI_B_CTLW0_SWRST | // Remain eUSCI state machine in resetEUSCI_B_CTLW0_MST |// Set as SPI masterEUSCI_B_CTLW0_SYNC |// Set as synchronous modeEUSCI_B_CTLW0_CKPL |// Set clock polarity highEUSCI_B_CTLW0_MSB;// MSB first
EUSCI_B0->CTLW0 |= EUSCI_B_CTLW0_SSEL__ACLK; // ACLKEUSCI_B0->BRW = 0x01;// /2,fBitClock = fBRCLK/(UCBRx+1).EUSCI_B0->CTLW0 &= ~EUSCI_B_CTLW0_SWRST;// Initialize USCI state machine
TXData = 0x01;// Initialize TX data to 0x01
// Enable global interrupt__enable_irq();
// Enable eUSCI_B0 interrupt in NVIC moduleNVIC->ISER[0] = 1 << ((EUSCIB0_IRQn) & 31);
// Wake up on exit from ISRSCB->SCR &= ~SCB_SCR_SLEEPONEXIT_Msk;
// Ensures SLEEPONEXIT takes effect immediately__DSB();
while(1){
EUSCI_B0->IFG |= EUSCI_B_IFG_TXIFG;// Clear TXIFG flagEUSCI_B0->IE |= EUSCI_B_IE_TXIE;// Enable TX interruptEUSCI_B0->IFG |= EUSCI_B_IFG_RXIFG;// Clear TXIFG flagEUSCI_B0->IE |= EUSCI_B_IE_RXIE;// Enable TX interrupt
__sleep();__no_operation();// For debug,Remain in LPM0
// Check the received data/*previousData = TXData – 1;if (RXData != (previousData)){// If the Received data is not equal to TXData-1, then// Set P1.0 LEDP1->OUT |= BIT0;}else{P1->OUT &= ~BIT0;}*/
for (i = 2000; i > 0; i–);// Delay before next transmission//TXData++;// Increment transmit data}
}// SPI interrupt service routine
void EUSCIB0_IRQHandler(void)
{if (EUSCI_B0->IFG & EUSCI_B_IFG_TXIFG){
EUSCI_B0->TXBUF = TXData;// Transmit charactersEUSCI_B0->IE &= ~EUSCI_B__TXIE;
// Wait till a character is received//while (!(EUSCI_B0->IFG & EUSCI_B_IFG_RXIFG));//RXData = EUSCI_B0->RXBUF;
// Clear the receive interrupt flag//EUSCI_B0->IFG &= ~EUSCI_B_IFG_RXIFG;}if (EUSCI_B0->IFG & EUSCI_B_IFG_RXIFG){//EUSCI_B0->IE &= ~EUSCI_B__RXIE;// USCI_B0 TX buffer ready?//while (!(EUSCI_B0->IFG & EUSCI_B_IFG_TXIFG));RXData = EUSCI_B0->RXBUF;EUSCI_B0->IE &= ~EUSCI_B__RXIE;// Echo received data//EUSCI_B0->TXBUF = EUSCI_B0->RXBUF;}
}
Susan Yang：
回复 user5121970:
请您参考下下面的这种方式
MSP430F55xx_usci_i2c_standard_master.c
gaoyang9992006：
回复 user5121970:
先完成独立的发送和接收调试，然后再实现联合调试。先确认基本的配置没有问题，硬件没有问题。
