Closed alexvatti closed 13 years ago
I think adding SPI_CS_HIGH to the spi_device mode will work. I didn't try.
spi_device->mode = SPI_MODE_0 | SPI_CS_HIGH;
The definitions are in the kernel source include/linux/spi/spi.h ...
#define SPI_CPOL 0x02 /_ clock polarity _/
#define SPI_MODE_0 (0|0) /_ (original MicroWire) _/
#define SPI_MODE_1 (0|SPI_CPHA)
#define SPI_MODE_2 (SPI_CPOL|0)
#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
#define SPI_CS_HIGH 0x04 /_ chipselect active high? _/
#define SPI_LSB_FIRST 0x08 /_ per-word bits-on-wire _/
#define SPI_3WIRE 0x10 /_ SI/SO signals shared _/
#define SPI_LOOP 0x20 /_ loopback mode _/
#define SPI_NO_CS 0x40 /_ 1 dev/bus, no chipselect _/
#define SPI_READY 0x80 /_ slave pulls low to pause */
...
Let me know what happens.
You are correct.Thank you very much for the help.
Hi, With respect to SPI communication in linux kernel gumstix board.
Generally chip select is low,when operation is performed on device in SPI communication. If i want to change reverse chip select signal ,that is chip select is high during operation,low is idle state. Where i have to make changes. I got adc code, for your site. Could you please help me