Re: [Paparazzi-devel] SPI with 16bit on LPC2148(YAPA)

[Gautier Hattenberger]

Hi,

The uint8_t* is just a pointer to the beginning of the buffer. If you do 16 bits transfers, 2 bytes are placed in the mcu register at each time (in the master branch).
See https://github.com/paparazzi/paparazzi/blob/master/sw/airborne/arch/lpc21/mcu_periph/spi_arch.c#L192

In the stable branches (v4.0 and v4.2), the "generic" spi driver is barely not used except for some peripherals using 8 bits transfer. The peripherals using 16 bits are actually "manually" configuring and using the spi.

Gautier


Le 20/02/2013 17:34, Mauro Garcia Acero a écrit :

Dear all,

 

The spi.h from mcu_periph is referred to transactions of 8bits words. For example:

extern uint8_t* spi_buffer_input;

 

The same for spi_arch.h from ../lpc21/mcu_periph/, but I have read that the LPC2148 can deal with 8 to 16 bits per transfer.

 

As long as I see in other modules, read registers from SPI devices are made as follows:

 

  spi_buffer_input = (uint8_t*) ....;

  spi_buffer_output = (uint8_t*) ....;

  SpiSetCPHA();

  SpiStart();

 

I don't thing that spliting every command into 2 bytes and sending them independently would work.

 

Any ideas?

 

Best regards,
Mauro.

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