MSP430FR2433: spi示例代码咨询

msp430fr243x_euscia0_spi_09.c (ti.com)

msp430fr243x_euscia0_spi_10.c (ti.com)

我们使用两个MSP-EXP430FR2433模块测试上述两个示例代码功能，但是在CCS内查看对应参数配置，好像没有数据传输？可以解释一下这两个示例代码吗？我们该怎样查看示例代码是否工作正常？

Susan Yang：

zhao ge 说：可以解释一下这两个示例代码吗？

示例说明可以在您给出的链接内查看

//******************************************************************************// MSP430FR243x Demo – eUSCI_A0, SPI 3-Wire Master Incremented Data//// Description: 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 TXData = RXData-1.

//******************************************************************************// MSP430FR243x Demo – eUSCI_A0, SPI 3-Wire Slave Data Echo//// Description: SPI slave talks to SPI master using 3-wire mode. Data received// from master is echoed back.

zhao ge 说：但是在CCS内查看对应参数配置，好像没有数据传输

您是按照图示来连接两个板子的？观察的是 RXData 和 TXData？

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zhao ge：

Hi Susan Yang

    

我使用两个个MSP-EXP430FR2433模块分别烧录msp430fr243x_euscia0_spi_09.c和msp430fr243x_euscia0_spi_10.c示例代码。

我尝试在master这端添加断点参数打印，读取到的RXData和UCA0TXBUF不会有任何改变，RXData一直是255，UCA0TXBUF一直是0x00050E，。我保证从设备先于主设备工作。

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Susan Yang：

谢谢反馈。我拿板子测试后给您回复

,

Susan Yang：

请去除 两个开发板上 J101的RXD 和 TXD 跳线帽，另外两个板子的GND也连接在一起

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zhao ge：

Hi Susan Yang    我们尝试拔掉 J101的RXD 和 TXD 跳线帽，再次进行测试，使用同样的示例代码，但是打印的TxData和RxData与你测试情况不符，请帮助确认一下，谢谢。

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Susan Yang：

附上我的测试代码

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//******************************************************************************
//MSP430FR243x Demo - eUSCI_A0, SPI 3-Wire Master Incremented Data
//
//Description: 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 TXData = RXData-1.
//USCI RX ISR is used to handle communication with the CPU, normally in LPM0.
//ACLK = ~32.768kHz, MCLK = SMCLK = DCO ~ 1MHz.BRCLK = SMCLK/2.
//
//
//MSP430FR2433
//-----------------
///|\||
//| ||
//--|RST|
//||
//|P1.4|-> Data In (UCA0SIMO)
//||
//|P1.5|<- Data OUT (UCA0SOMI)
//||
//|P1.6|-> Serial Clock Out (UCA0CLK)
//
//
//Ling Zhu
//Texas Instruments Inc.
//Sept 2015
//Built with IAR Embedded Workbench v6.20 & Code Composer Studio v6.0.1
//******************************************************************************
#include <msp430.h>unsigned char RXData = 0;
unsigned char TXData;int main(void)
{WDTCTL = WDTPW | WDTHOLD;// Stop watchdog timerP1SEL0 |= BIT4 | BIT5 | BIT6;// set 3-SPI pin as second functionUCA0CTLW0 |= UCSWRST;// **Put state machine in reset**UCA0CTLW0 |= UCMST|UCSYNC|UCCKPL|UCMSB;// 3-pin, 8-bit SPI master// Clock polarity high, MSBUCA0CTLW0 |= UCSSEL__SMCLK;// SMCLKUCA0BR0 = 0x01;// /1, fBitClock = fBRCLK/UCBRxUCA0BR1 = 0;//UCA0MCTLW = 0;// No modulationUCA0CTLW0 &= ~UCSWRST;// **Initialize USCI state machine**UCA0IE |= UCRXIE;// Enable USCI_A0 RX interruptTXData = 0x01;// Holds TX dataPM5CTL0 &= ~LOCKLPM5;// Disable the GPIO power-on default high-impedance mode// to activate previously configured port settingswhile(1){UCA0IE |= UCTXIE;// Enable TX interrupt__bis_SR_register(LPM0_bits | GIE);// enable global interrupts, enter LPM0__no_operation();// For debug,Remain in LPM0__delay_cycles(2000);// Delay before next transmissionTXData++;// Increment transmit data}
}#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{switch(__even_in_range(UCA0IV,USCI_SPI_UCTXIFG)){case USCI_NONE: break;// Vector 0 - no interruptcase USCI_SPI_UCRXIFG:RXData = UCA0RXBUF;UCA0IFG &= ~UCRXIFG;__bic_SR_register_on_exit(LPM0_bits);// Wake up to setup next TXbreak;case USCI_SPI_UCTXIFG:UCA0TXBUF = TXData;// Transmit charactersUCA0IE &= ~UCTXIE;break;default: break;}
}

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zhao ge：

Hi Susan Yang

    我尝试对比master端代码，没有任何差异，请问CCS内你是怎样调试的？也是通过断电打印参数吗？是否有某些特殊的配置？

,

Susan Yang：

zhao ge 说：也是通过断电打印参数吗？

我没有设置断点，而是全速运行后暂停，而后查看RXData和 TXData的值

SPI有时序要求，不建议打断点