FLEXCOMM3_DriverIRQHandler is getting invoked even defining my own interrupt handler

sushmasan — Tue, 03 Jun 2025 19:28:53 GMT

Hello Team,

I am seeing an issue, not sure what is missing.

Please find more details,

#define SPI3_IF SPI3 #define SPI3_CLK_SRC kCLOCK_Flexcomm3 #define SPI3_CLK_FREQ CLOCK_GetFlexCommClkFreq(3U) #define SPI3_SLAVE_SELECT 0 #define SPI3_IRQHandler FLEXCOMM3_IRQHandler #define SPI3_IRQn FLEXCOMM3_IRQn

Below is my interrupt handler,

uint16_t receiveBuff[256]; void SPI3_IRQHandler(void) { uint16_t tmp_data; PRINTF("(%s) - %s() at line %d -> START\r\n",__FILE__,__func__,__LINE__); if ((SPI_GetStatusFlags(SPI3_IF) & kSPI_RxNotEmptyFlag)) { tmp_data = SPI_ReadData(SPI3_IF); receiveBuff[rxIndex] = tmp_data; } SDK_ISR_EXIT_BARRIER; }

In the spi initialization,

SPI_MasterGetDefaultConfig(&masterConfig); // Set the baudrate masterConfig.enableLoopback = false; masterConfig.enableMaster = true; masterConfig.polarity = kSPI_ClockPolarityActiveHigh; masterConfig.phase = kSPI_ClockPhaseFirstEdge; masterConfig.direction = kSPI_MsbFirst; masterConfig.baudRate_Bps = SPI3_BAUDRATE_500000; masterConfig.sselNum = kSPI_Ssel0; masterConfig.sselPol = (spi_spol_t)SPI3_SPOL; // SPI enable and Mast mode selection is done as part of this SPI_MasterInit(SPI3_IF, &masterConfig, SPI3_CLK_FREQ); SPI_EnableInterrupts(SPI3_IF, kSPI_TxLvlIrq | kSPI_RxLvlIrq); EnableIRQ(SPI3_IRQn);

But when I run the code, the control is going to "FLEXCOMM3_DriverIRQHandler", even in debug also I am seeing the same behavior. So I am wondering what is causing that.

I understand that, SDK specific interrupt handler gets invoked, only when there is any interrupt handler defined for it, but in this scenario there is an already interrupt handler defined.

Can someone please let me know, what is missing?

Re: FLEXCOMM3_DriverIRQHandler is getting invoked even defining my own interrupt handler

sushmasan — Mon, 09 Jun 2025 13:50:32 GMT

Hello Team,

Can someone please look into this and let me know what I am missing?

Regards,
San

Re: FLEXCOMM3_DriverIRQHandler is getting invoked even defining my own interrupt handler

Alice_Yang — Fri, 04 Jul 2025 04:26:50 GMT

Hi @sushmasan

The SDK uses a vector table redirection mechanism where:

-The actual interrupt vector table points to SDK-provided handlers (like FLEXCOMM3_DriverIRQHandler)

- These handlers then call your user-defined handlers if they exist

Please try to modify the vector table.

Locate the interrupt vector table.
Replace FLEXCOMM3_DriverIRQHandler with your SPI3_IRQHandler

Hope it helps.

If still have any issue, please contact me without any hesitate. Thank you.

Alice

topic FLEXCOMM3_DriverIRQHandler is getting invoked even defining my own interrupt handler in LPC Microcontrollers

FLEXCOMM3_DriverIRQHandler is getting invoked even defining my own interrupt handler

Re: FLEXCOMM3_DriverIRQHandler is getting invoked even defining my own interrupt handler

Re: FLEXCOMM3_DriverIRQHandler is getting invoked even defining my own interrupt handler