Bluenrg-ms/stm32F4 : Hci packet through spi

Question

I am working on a project to developp a ble communication but i'm having some trouble to initialize and comprehend the return frame from ble.

After lowering the cs, testing the header (0x0A,0x00,0x00,0x00,0x00) and sending directly after hci_reset (0x01,0x03,0x0C,0x00) with HAL_SPI_TransmitReceive, I want to read the return value from ble.

So lowering the cs one more time, test header (0x0B,0x00,0x00,0x00,0x00) and sending dummies data with HAL_SPI_TransmitReceive. I obtain this frame: 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00.

But from what I have understood this far I should obtain something like:0x04,0x0E,0x04,0x01,0x03,0x0C,0x00.

Can someone point out where I am wrong?

Answer 1

Almost resolved.

Actually I changed some points in my code and finally retrieved the data from ble corresponding to what I was waiting for.

What I was doing before was closing the frame after receiving right header from ble. Then sending header to write command followed by the command.

That is the procedure I applied: Information communication spi (write): • open CS ◦ send header_master[5]={0x0a,0,0,0,0} in TransmitReceive ▪ if header_slave[0]=0x02 and header_slave[1]>0 • send commands • close CS ▪ else • close CS • goto open CS

Information communication spi (read): • wait for exti from ble ◦ Open CS ▪ send header_master[5]={0x0b,0,0,0,0} in TransmitReceive • if header_slave[0]=0x02 and header_slave[3]>0 ◦ send (header_slave[3]) dummies ◦ close CS • else ◦ close CS ◦ goto open CS

Hope that can help some people.

Now i'm facing an other issue. I don't receive the interrupt after sending the command so I do polling up to catching the frame I need. Any solution?

Answer 2

You must always start to reset the bluenrg first: this will cause the bluenrg to trigger an interrupt. It is unclear what the behaviour is without the hard reset.