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器件型号：TMS320F28P650DK 工具与软件：
大家好
我想设置 SPI 通信、因此我首先上传了 spi_ex4_external_loopback_fifo_interrupt 示例。 不幸的是、根据我是否设置了断点、它的运行方式有所不同。
没有断点：
如果我让它正常运行、除了芯片选择之外、我可以测量示波器上的所有信号。 这会始终保持低电平、即使它也是低电平有效信号、这就是为什么我实际上会期望至少是高电平的原因。 此外、该参数不变。 因此它会一直保持低电平。
使用断点：
如果我设置一个断点、例如在 SPI_writeDataNonBlocking (SPIB_BASE、sData[i])处；电平始终如预期的高、除非它发送数据、否则它短暂地处于低电平。
有人知道导致这种情况的原因吗？ 如果能有任何帮助、我将不胜感激。
//############################################################################# // // FILE: spi_ex4_external_loopback_fifo_interrupt.c // // TITLE: SPI Digital Loopback with FIFO Interrupts // //! \addtogroup driver_example_list //! <h1>SPI Digital External Loopback with FIFO Interrupts</h1> //! //! This program uses the external loopback between two SPI modules. Both //! the SPI FIFOs and their interrupts are used. SPIA is configured as a peripheral //! and receives data from SPI B which is configured as a controller. //! //! A stream of data is sent and then compared to the received stream. //! The sent data looks like this: \n //! 0000 0001 \n //! 0001 0002 \n //! 0002 0003 \n //! .... \n //! FFFE FFFF \n //! FFFF 0000 \n //! etc.. \n //! This pattern is repeated forever. //! //! \note This example project has support for migration across our C2000 //! device families. If you are wanting to build this project from launchpad //! or controlCARD, please specify in the .syscfg file the board you're using. //! At any time you can select another device to migrate this example. //! //! \b External \b Connections \n //! Refer to SysConfig for external connections (GPIO pin numbers) specific to each device //! //! \b Watch \b Variables \n //! - \b sData - Data to send //! - \b rData - Received data //! - \b rDataPoint - Used to keep track of the last position in the receive //! stream for error checking //! // //############################################################################# // // C2000Ware v5.03.00.00 // // Copyright (C) 2024 Texas Instruments Incorporated - http://www.ti.com // // 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. // $ //########################################################################### // // Included Files // #include "driverlib.h" #include "device.h" #include "board.h" // // Globals // volatile uint16_t sData[2]; // Send data buffer volatile uint16_t rData[2]; // Receive data buffer volatile uint16_t rDataPoint = 0; // To keep track of where we are in the // data stream to check received data // // Function Prototypes // __interrupt void spibTxFIFOISR(void); __interrupt void spiaRxFIFOISR(void); // // Main // void main(void) { uint16_t i; // // Initialize device clock and peripherals // Device_init(); // // Disable pin locks and enable internal pullups. // Device_initGPIO(); // // Initialize PIE and clear PIE registers. Disables CPU interrupts. // Interrupt_initModule(); // // Initialize the PIE vector table with pointers to the shell Interrupt // Service Routines (ISR). // Interrupt_initVectorTable(); // // Board initialization // Board_init(); // // Initialize the data buffers // for(i = 0; i < 2; i++) { sData[i] = i; rData[i]= 0; } // // Enable Global Interrupt (INTM) and realtime interrupt (DBGM) // EINT; ERTM; // // Loop forever. Suspend or place breakpoints to observe the buffers. // while(1) { ; } } // // SPI B Transmit FIFO ISR // __interrupt void spibTxFIFOISR(void) { uint16_t i; // // Send data // for(i = 0; i < 2; i++) { SPI_writeDataNonBlocking(SPIB_BASE, sData[i]); } // // Increment data for next cycle // for(i = 0; i < 2; i++) { sData[i] = sData[i] + 1; } // // Clear interrupt flag and issue ACK // SPI_clearInterruptStatus(SPIB_BASE, SPI_INT_TXFF); Interrupt_clearACKGroup(INT_SPIB_controller_TX_INTERRUPT_ACK_GROUP); } // // SPI A Receive FIFO ISR // __interrupt void spiaRxFIFOISR(void) { uint16_t i; // // Read data // for(i = 0; i < 2; i++) { rData[i] = SPI_readDataNonBlocking(SPIA_BASE); } // // Check received data // for(i = 0; i < 2; i++) { if(rData[i] != (rDataPoint + i)) { // Something went wrong. rData doesn't contain expected data. // ESTOP0; } } rDataPoint++; // // Clear interrupt flag and issue ACK // SPI_clearInterruptStatus(SPIA_BASE, SPI_INT_RXFF); Interrupt_clearACKGroup(INT_SPIA_peripheral_RX_INTERRUPT_ACK_GROUP); } // // Enabled only for SysConfig functionality // __interrupt void INT_SPIA_peripheral_TX_ISR(void) { // // Issue ACK // Interrupt_clearACKGroup(INT_SPIA_peripheral_TX_INTERRUPT_ACK_GROUP); } // // Enabled only for SysConfig functionality // __interrupt void INT_SPIB_controller_RX_ISR(void) { // // Issue ACK // Interrupt_clearACKGroup(INT_SPIB_controller_RX_INTERRUPT_ACK_GROUP); } // // End of file //
