MSPM0G3507: MCU作为从机，I2C SCL短接到GND 1秒后松开，SCL无法恢复高电平

SYSCONFIG_WEAK void SYSCFG_DL_I2C_init(void) {

    DL_I2C_setClockConfig(I2C_INST,
        (DL_I2C_ClockConfig *) &gI2CClockConfig);
    DL_I2C_disableAnalogGlitchFilter(I2C_INST);

    /* Configure Target Mode */
    DL_I2C_setTargetOwnAddress(I2C_INST, I2C_TARGET_OWN_ADDR);
    DL_I2C_setTargetTXFIFOThreshold(I2C_INST, DL_I2C_TX_FIFO_LEVEL_BYTES_1);
    DL_I2C_setTargetRXFIFOThreshold(I2C_INST, DL_I2C_RX_FIFO_LEVEL_BYTES_1);
    DL_I2C_enableTargetTXEmptyOnTXRequest(I2C_INST);

    DL_I2C_enableTargetClockStretching(I2C_INST);
    /* Configure Interrupts */
    DL_I2C_enableInterrupt(I2C_INST,
                           DL_I2C_INTERRUPT_TARGET_RXFIFO_TRIGGER |
                           DL_I2C_INTERRUPT_TARGET_START |
                           DL_I2C_INTERRUPT_TARGET_STOP);


    /* Enable module */
    DL_I2C_enableTarget(I2C_INST);


}



/*
 * Copyright (c) 2021, 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.
 */

#include "ti_msp_dl_config.h"

/* Maximum size of TX packet */
#define I2C_TX_MAX_PACKET_SIZE (16)

/* Maximum size of RX packet */
#define I2C_RX_MAX_PACKET_SIZE (16)

/* Data sent to Controller in response to Read transfer */
uint8_t gTxPacket[I2C_TX_MAX_PACKET_SIZE] = {0x00};

/* Counters for TX length and bytes sent */
uint32_t gTxLen, gTxCount;
uint32_t gTxFillNum;
/* Data received from Controller during a Write transfer */
uint8_t gRxPacket[I2C_RX_MAX_PACKET_SIZE];
/* Counters for TX length and bytes sent */
uint32_t gRxLen, gRxCount;

int main(void)
{
    SYSCFG_DL_init();
    /* Set LED to indicate start of transfer */
    DL_GPIO_setPins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_1_PIN);

    /*
     * Fill FIFO with data.
     * Note that transactions are initiated by the Controller, so this example
     * only fills the buffer and the Target device will send this data when
     * requested by the Controller.
     * The TX FIFO is initialized to zero and then it will echo the data sent by
     * Controller.
     */
    gTxCount = 0;
    gTxLen   = I2C_TX_MAX_PACKET_SIZE;
    DL_I2C_setTimeoutACount(I2C_INST,2);
    DL_I2C_setTimeoutBCount(I2C_INST,2);
    DL_I2C_enableTimeoutA(I2C_INST);
    //DL_I2C_enableTimeoutB(I2C_INST);
    DL_I2C_disableTargetTXEmptyOnTXRequest(I2C_INST);
    DL_I2C_enableInterrupt(I2C_INST, DL_I2C_INTERRUPT_TARGET_RXFIFO_OVERFLOW|
                           DL_I2C_TARGET_INTERRUPT_OVERFLOW|
                           DL_I2C_INTERRUPT_TARGET_TXFIFO_UNDERFLOW|
                           DL_I2C_INTERRUPT_TARGET_TXFIFO_EMPTY |
                           DL_I2C_INTERRUPT_TIMEOUT_A |
                           DL_I2C_INTERRUPT_TIMEOUT_B|
                           DL_I2C_INTERRUPT_TARGET_PEC_RX_ERROR|
                           DL_I2C_INTERRUPT_TARGET_RX_DONE|
                           DL_I2C_INTERRUPT_TARGET_ARBITRATION_LOST|
                           DL_I2C_INTERRUPT_TARGET_GENERAL_CALL|
                           DL_I2C_INTERRUPT_TARGET_STOP|
                           DL_I2C_INTERRUPT_TARGET_RXFIFO_FULL|
                           DL_I2C_INTERRUPT_TARGET_TXFIFO_TRIGGER|
                           DL_I2C_INTERRUPT_TARGET_TX_DONE
                           );

    /* Initialize variables to receive data inside RX ISR */
    gRxCount = 0;
    gRxLen   = I2C_RX_MAX_PACKET_SIZE;
    DL_I2C_enableTargetACKOverride(I2C_INST);
    NVIC_EnableIRQ(I2C_INST_INT_IRQN);

    DL_SYSCTL_enableSleepOnExit();

    /* Go to STOP, the device will wake-up on address match */
    while (1) {
        __WFI();
    }
}
int aa;
int f1= 0;
int f2= 0;
int tmt_flag= 0;
int rvflag= 0;
void I2C_INST_IRQHandler(void)
{
    static bool dataRx = false;

    aa = DL_I2C_getPendingInterrupt(I2C_INST);
    switch (aa) {
        case DL_I2C_IIDX_TARGET_START:
            /* Initialize RX or TX after Start condition is received */
            gTxCount = 0;
            gRxCount = 0;
            dataRx   = false;
            rvflag= 0;
            /* Flush TX FIFO to refill it */
            DL_I2C_flushTargetTXFIFO(I2C_INST);
            break;
        case DL_I2C_IIDX_TARGET_RXFIFO_TRIGGER:
            /* Store received data in buffer */
            dataRx = true;
            while (DL_I2C_isTargetRXFIFOEmpty(I2C_INST) != true) {
                if (gRxCount < gRxLen) {
                    gRxPacket[gRxCount++] = DL_I2C_receiveTargetData(I2C_INST);
                } else {
                    /* Prevent overflow and just ignore data */
                    DL_I2C_receiveTargetData(I2C_INST);
                }
                if(gRxCount >= 2)
                {
                    DL_I2C_enableTargetACKOverride(I2C_INST);
                    DL_I2C_setTargetACKOverrideValue(I2C_INST,DL_I2C_TARGET_RESPONSE_OVERRIDE_VALUE_NACK);
                    f1 = 1;
                }
                else
                {
                    DL_I2C_enableTargetACKOverride(I2C_INST);
                    DL_I2C_setTargetACKOverrideValue(I2C_INST,DL_I2C_TARGET_RESPONSE_OVERRIDE_VALUE_ACK);
                    f2 = 1;
                }
            }
            break;
        case DL_I2C_IIDX_TARGET_TXFIFO_TRIGGER:
            /* Fill TX FIFO if there are more bytes to send */
            if (gTxCount < gTxLen) {
                gTxFillNum = DL_I2C_fillTargetTXFIFO(
                    I2C_INST, &gTxPacket[gTxCount], 1);
                gTxCount += gTxFillNum;
            } else {
                /*
                 * Fill FIFO with 0x00 if more data is requested than
                 * expected gTxLen
                 */
                while (DL_I2C_transmitTargetDataCheck(I2C_INST, 0x88) != false)
                    ;
            }
            break;
        case DL_I2C_IIDX_TARGET_STOP:
            /* If data was received, echo to TX buffer */
            if (dataRx == true) {
                for (uint16_t i = 0;
                     (i < gRxCount) && (i < I2C_TX_MAX_PACKET_SIZE); i++) {
                    gTxPacket[i] = gRxPacket[i];
                    DL_I2C_flushTargetTXFIFO(I2C_INST);
                }
                dataRx = false;
            }
            /* Toggle LED to indicate successful RX or TX */
            DL_GPIO_togglePins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_1_PIN);
            break;

        case DL_I2C_IIDX_TARGET_TXFIFO_EMPTY:
            /* Fill TX FIFO if there are more bytes to send */
            if (gTxCount < 8) {
                gTxFillNum = DL_I2C_fillTargetTXFIFO(
                    I2C_INST, &gTxPacket[gTxCount], 1);
                gTxCount += gTxFillNum;
            } else {
                /*
                 * Fill FIFO with 0x00 if more data is requested than
                 * expected gTxLen
                 */
                while (DL_I2C_transmitTargetDataCheck(I2C_INST, 0x99) != false)
                ;
            }
            break;
        case DL_I2C_IIDX_TARGET_RX_DONE:
            rvflag++;
            break;
            /* Not used for this example */
        case DL_I2C_IIDX_TARGET_RXFIFO_FULL:
            /* Not used for this example */
        case DL_I2C_IIDX_TARGET_GENERAL_CALL:
            /* Not used for this example */
        case DL_I2C_IIDX_TARGET_EVENT1_DMA_DONE:
            /* Not used for this example */
        case DL_I2C_IIDX_TARGET_EVENT2_DMA_DONE:
            /* Not used for this example */
            break;
        case DL_I2C_IIDX_TARGET_PEC_RX_ERROR:
            aa = 100;
            break;
        case DL_I2C_IIDX_TARGET_ARBITRATION_LOST:
        case DL_I2C_IIDX_TIMEOUT_A:
        case DL_I2C_IIDX_TIMEOUT_B:
        case DL_I2C_IIDX_TARGET_TXFIFO_UNDERFLOW:
        case DL_I2C_IIDX_TARGET_RXFIFO_OVERFLOW:
        case DL_I2C_IIDX_INTERRUPT_OVERFLOW:

            tmt_flag = 1;
            break;
        default:
            break;
    }
}