SPI receive interrupt on KL27

rickstuart — Wed, 08 Jul 2015 18:11:10 GMT

Hi,

I have two FRDM-KL27Z development boards. They are connected using the SPI0 port. One is master and the other slave. I can send/receive 16bit data between them using polling. Now I need to change the slave to receive 2 8bit bytes. Polling is not fast enough anymore. I keep missing the second 8bit byte. So I want to try using receive interrupts on the slave. But so far I am getting no interrupts. The 2 SPI configuration registers are set up as such:

SPI0->C1 = SPI_C1_SPIE_MASK | SPI_C1_SPE_MASK | SPI_C1_CPHA_MASK | SPI_C1_SSOE_MASK;

SPI0->C2 = SPI_C2_MODFEN_MASK;

And I'm using SPI0_IRQHandler() as the name of the SPI0 interrupt handler. This is defined in the Freescale startup_MKL27Z644.s file. That file has this header for identification:

; ---------------------------------------------------------------------------------------

; @file: startup_MKL27Z644.s

; @purpose: CMSIS Cortex-M0P Core Device Startup File

; MKL27Z644

; @version: 1.4

; @date: 2014-9-22

; @build: b140923

; ---------------------------------------------------------------------------------------

I had thought setting the SPI_C1_SPIE_MASK bit would enable the receive SPI interrupt. But it looks like the interrupt is never getting called.

-thanks

Re: SPI receive interrupt on KL27

Jorge_Gonzalez — Wed, 08 Jul 2015 19:13:48 GMT

Hello rick stuart:

Apart from enabling the interrupt from the SPI module you need to enable the interrupt vector for the ARM NVIC module. Something like this:

NVIC_EnableIRQ(SPI0_IRQn);

Regards!,
Jorge Gonzalez

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