----- Original Message ----- From: David Brownell Sent: 10/01/10 08:02 PM To: [email protected], Charles Martel Subject: Re: Change MODE, CS, BUS, and SPEED using SPI-DEV driver?
--- On Fri, 10/1/10, Charles Martel <[email protected]> wrote: >> >> The question I have is how do I modify these settings? > Evidently you haven't yet looked at the > documentation. Try that. There's a sample > program which will be informative. Thank you for your reply. 1) I have read numerous documents but don't see where they explain what I need considering that only the following SPI driver files are built: built-in.o, hspi-s3c64xx.o, spi.o, and spi-dev.o. I had built a kernel for the s3c6410 using linux-2.6.24. I noticed that there are drivers for the s3c24xx but only the "S3C6410 High Speed SPI Driver" is specific to the s3c6410. I do not believe that the the s3c24xx series drivers are compatible with the s3c6410. Am I wrong? The problem I am having would go away if I could use the s3c24xx drivers since they result in the spidev.c file being built. 2) The following all return 0 (debug message: "Invalid ioctl option"): ret = ioctl(fd, SPI_IOC_WR_MODE, &spiMode); ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bitsPerWord); ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &spiSpeed); These ioctl functions are supported by the spidev_ioctl function in spidev.c. However, as mentioned above, the "S3C6410 High Speed SPI Driver" does not build spidev.c. The same result happens when I use the following ioctl call: ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); where tr structure (spi_ioc_transfer) contains the following: tr.tx_buf = txBuf; tr.rx_buf = rxBuf; tr.delay_usecs = delay; tr.speed_hz = speed; tr.bits_per_word = 8; tr.pad = 0; tr.cs_change = 0; This is what I expect since spi-dev.c does not handle these ioctl requests. The spidev_ioctl function in spi-dev.c only handles the following: SET_SPI_FLAGS, SET_SPI_RETRIES, and SET_SPI_TIMEOUT. 3) The following always succeeds: ret = write(fd, txBuf, xLen); ------------------------------------------------------------------------------ Virtualization is moving to the mainstream and overtaking non-virtualized environment for deploying applications. Does it make network security easier or more difficult to achieve? Read this whitepaper to separate the two and get a better understanding. http://p.sf.net/sfu/hp-phase2-d2d _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
