Paul,
Sorry to ask a really numpty question, but how did you establish your
oscillator frequency and max_speed_hz? Are they coincidentally the
same? The other example I saw had completely different numbers.
Thanks,
Nick
On 20/01/11 20:53, Paul Thomas wrote:
On Thu, Jan 20, 2011 at 1:24 AM, Nick Lee<[email protected]> wrote:
Make sure your using a dedicated interrupt for the mcp2515, the driver
won't work without an interrupt, and the at91 GPIO interrupts I messed
with, but couldn't get to work.
Yes, I'd kind of come to the conclusion it was an interrupt issue too. Our
board is wired up to use IRQ1, but the closest I can get to making it work
(actually seeing the MCP assigned to an interrupt on /proc/interrupts and
seeing it trigger) is to set the .irq value in the mcp setup structure to
AT91SAM9260_ID_IRQ2 (which seems to come out as interrupt 31, which I'm sure
isn't the one we want). What .irq value have you used?
Ta,
Nick
Nick, I'm using AT91SAM9260_ID_IRQ0 with something like this for the setup:
thanks,
Paul
static struct mcp251x_platform_data mcp251x_info = {
.oscillator_frequency = 20000000,
.model = CAN_MCP251X_MCP2515,
};
static struct spi_board_info ek_spi_devices[] = {
{
.modalias = "mcp251x",
.platform_data =&mcp251x_info1,
.max_speed_hz = 2*1000*1000,
.chip_select = 2,
.bus_num = 1,
.irq = AT91SAM9260_ID_IRQ0,
},
};
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