F411 SPI2 Not Defined

[HDaji.1]

I am using example code SPI_TwoBoards_FullDuplex_DMA, and want to change SPI1 to SPI2.

LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SPI2);

However, in the above line, compiler complains LL_APB2_GRP1_PERIPH_SPI2 not defined.

I wonder why.

[KnarfB]

Because SPI2 is on AHB1, not AHB2. Try LL_APB1_GRP1_PERIPH_SPI2 See data sheet.

hth

KnarfB

[HDaji.1]

I have another question:

For the SPI Tx/Rx callback functions, they are called in IRQ handler like DMA2_Stream0_IRQHandler. But I cannot find in the project where DMA2_Stream0_IRQHandler is registered.

[KnarfB]

The names of the IQR Handlers are defined in the startup code, interrupt vector table, assembly code. Something like startup_stm32f411retx.s. They are pre-defined with a dummy implementation "Default_Handler", but you can override them by implementing a function with exactly that name in your own code.

hth

KnarfB