Hi,

I am working on spi driver for freescale mxc board.My issue is with the test application.Its not working properly for bits per word option other than 8,16,32.The spi test logs follows.

Test Application for SPI driver *********
*******************************************************
* This test sends bytes of the last parameter to *
* a specific SPI device. The maximum transfer *
* bytes are 4096 bytes for bits per word less than *
* 8(including 8), 2048 bytes for bits per word *
* between 9 and 16, 1024 bytes for bits per word *
* larger than 17(including 17). SPI writes data *
* received data from the user into Tx FIFO and *
* waits for the data in the Rx FIFO. Once the data *
* is ready in the Rx FIFO, it is read and sent to *
* user. Test is considered successful if data *
* received = data sent. *
* *
* NOTE: As this test is intended to test the SPI *
* device,it is always configured in loopback mode *
* reasons is that it is dangerous to send ramdom *
* data to SPI slave devices. *
* *
* Options : ./mxc_spi_test1
[-D spi_no] [-s speed]
[-b bits_per_word]
[-H] [-O] [-C] <value>
* *
* <spi_no> - CSPI Module number in [0] *
* <speed> - Max transfer speed *
* <bits_per_word> - bits per word *
* -H - Phase 1 operation of clock *
* -O - Active low polarity of clock *
* -C - Active high for chip select *
* <value> - Actual values to be sent *
*******************************************************

root@freescale ~$ ./mxc_spi_test1 -D 0 -s 100 -b 32 -H -O -C hema
Execute data transfer test: 0 4 hema
spi mode: 7
bits per word: 32
max speed: 100 Hz (0 KHz)
Data sent : hema
Data received : hema
Test PASSED.
root@freescale ~$ ./mxc_spi_test1 -D 0 -s 100 -b 64 -H -O -C hema
Execute data transfer test: 0 4 hema
spi mode: 7
bits per word: 64
max speed: 100 Hz (0 KHz)
Data sent : hema
Data received : hema
Test PASSED.
root@freescale ~$ ./mxc_spi_test1 -D 0 -s 100 -b 10 -H -O -C hema
Execute data transfer test: 0 4 hema
spi mode: 7
bits per word: 10
max speed: 100 Hz (0 KHz)
Data sent : hema
Data received : hm
Test PASSED.
root@freescale ~$ ./mxc_spi_test1 -D 0 -s 100 -b 20 -H -O -C hema
Execute data transfer test: 0 4 hema
spi mode: 7
bits per word: 20
max speed: 100 Hz (0 KHz)
Data sent : hema
Data received : he
Test PASSED.
root@freescale ~$ ./mxc_spi_test1 -D 0 -s 100 -b 24 -H -O -C hema
Execute data transfer test: 0 4 hema
spi mode: 7
bits per word: 24
max speed: 100 Hz (0 KHz)
Data sent : hema
Data received : hem
Test PASSED.
root@freescale ~$ ./mxc_spi_test1 -D 0 -s 100 -b 24 -H -O -C 123456789
Execute data transfer test: 0 9 123456789
spi mode: 7
bits per word: 24
max speed: 100 Hz (0 KHz)
Data sent : 123456789
Data received : 123
Test PASSED.
root@freescale ~$ ./mxc_spi_test1 -D 0 -s 100 -b 20 -H -O -C 123456789
Execute data transfer test: 0 9 123456789
spi mode: 7
bits per word: 20
max speed: 100 Hz (0 KHz)
Data sent : 123456789
Data received : 12
Test PASSED.
root@freescale ~$ ./mxc_spi_test1 -D 0 -s 100 -b 9 -H -O -C 123456789
Execute data transfer test: 0 9 123456789
spi mode: 7
bits per word: 9
max speed: 100 Hz (0 KHz)
Data sent : 123456789
Data received : 1
Test PASSED.


The issue is for example if i select bits per word option as 10 and transfer hema(data), i am receiving hm(data).I am not receiving hema(data).

Please help me with the above issue.

Thanks in advance.

Regards,
Prathyusha.kh

Look into the SPI controller documentation to see if it really supports something different than n*8 (12 bits are also possible). Devices rarely (if ever) use different lengths.