Posted on August 27, 2014 at 09:47Hello,
Kindly help me resolve the STM32F4 SPI interrupt problem.
I am trying to connect two stm32f4 boards, one of it is stm32f439 evaluation board and other one is stm32f407 based my development board. I am testing interrupt based SPI communication example. I am using SPI1 peripheral for both boards. I have configured STM32F439 eval board as Master and my STM32F407 based dev't board as slave.
Have enabled Rx interrupt on slave board. I have grounded SPI slave cs pin and have configured slave with SPI_NSS_Soft setting.
I am expecting that when i start transferring data from master board, slave board should invoke SPI rx interrupt ISR.
But here what i observed is that as soon as my slave board boots up it gets SPI receive interrupt. It doesn't wait for master to send data. I tried this even without connecting Master card signals to Slave card.
I am unable to understand what triggers the SPI interrupt. Is it a setting problem or hardware problem
I understand that when rx data register is not empty, Rx interrupt will occur
Kindly help.
#stm32 #stm32f4-spi-interrupt
