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configure spi
http://www.at91.com/samphpbb/viewtopic.php?f=12&t=19046		 Page 1 of 1
Author:  federicololli [ Tue Mar 09, 2010 1:24 pm ]
Post subject:  configure spi
Hi,
I have this problem,I configured the SPI in the kernel as follows:
in the board-foxg20.c:

/*
* SPI devices.
*/
static struct spi_board_info foxg20_spi_devices[] = {
#if !defined(CONFIG_MMC_AT91)
{
.modalias = "mtd_dataflash",
.chip_select = 1,
.max_speed_hz = 15 * 1000 * 1000,
.bus_num = 0,
},
#endif

};

static struct spi_board_info foxg20_spi_devices1[] = {

{
.modalias = "spidev",
.chip_select = 0,
.max_speed_hz = 15*1000*1000,
.bus_num=1,
},

};
and in the at91sam9260_devices.c:

/* --------------------------------------------------------------------
* SPI
* -------------------------------------------------------------------- */

#if defined(CONFIG_SPI_ATMEL) || defined(CONFIG_SPI_ATMEL_MODULE)
static u64 spi_dmamask = DMA_BIT_MASK(32);

static struct resource spi0_resources[] = {
[0] = {
.start = AT91SAM9260_BASE_SPI0,
.end = AT91SAM9260_BASE_SPI0 + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91SAM9260_ID_SPI0,
.end = AT91SAM9260_ID_SPI0,
.flags = IORESOURCE_IRQ,
},
};

static struct platform_device at91sam9260_spi0_device = {
.name = "atmel_spi",
.id = 0,
.dev = {
.dma_mask = &spi_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.resource = spi0_resources,
.num_resources = ARRAY_SIZE(spi0_resources),
};

static const unsigned spi0_standard_cs[4] = { AT91_PIN_PA3, AT91_PIN_PC11, AT91_PIN_PC16, AT91_PIN_PC17 };

static struct resource spi1_resources[] = {
[0] = {
.start = AT91SAM9260_BASE_SPI1,
.end = AT91SAM9260_BASE_SPI1 + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91SAM9260_ID_SPI1,
.end = AT91SAM9260_ID_SPI1,
.flags = IORESOURCE_IRQ,
},
};

static struct platform_device at91sam9260_spi1_device = {
.name = "atmel_spi",
.id = 1,
.dev = {
.dma_mask = &spi_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.resource = spi1_resources,
.num_resources = ARRAY_SIZE(spi1_resources),
};

static const unsigned spi1_standard_cs[4] = { AT91_PIN_PB3, AT91_PIN_PC5, AT91_PIN_PC4, AT91_PIN_PC3 };

void __init at91_add_device_spi(struct spi_board_info *devices, int nr_devices)
{
int i;
unsigned long cs_pin;
short enable_spi0 = 0;
short enable_spi1 = 0;

/* Choose SPI chip-selects */
for (i = 0; i < nr_devices; i++) {
if (devices[i].controller_data)
cs_pin = (unsigned long) devices[i].controller_data;
else if (devices[i].bus_num == 0)
cs_pin = spi0_standard_cs[devices[i].chip_select];
else
cs_pin = spi1_standard_cs[devices[i].chip_select];

if (devices[i].bus_num == 0)
enable_spi0 = 1;
else
enable_spi1 = 1;

/* enable chip-select pin */
at91_set_gpio_output(cs_pin, 1);

/* pass chip-select pin to driver */
devices[i].controller_data = (void *) cs_pin;
}

spi_register_board_info(devices, nr_devices);

/* Configure SPI bus(es) */
if (enable_spi0) {
at91_set_A_periph(AT91_PIN_PA0, 0); /* SPI0_MISO */
at91_set_A_periph(AT91_PIN_PA1, 0); /* SPI0_MOSI */
at91_set_A_periph(AT91_PIN_PA2, 0); /* SPI1_SPCK */

at91_clock_associate("spi0_clk", &at91sam9260_spi0_device.dev, "spi_clk");
platform_device_register(&at91sam9260_spi0_device);
}
if (enable_spi1) {
at91_set_A_periph(AT91_PIN_PB0, 0); /* SPI1_MISO */
at91_set_A_periph(AT91_PIN_PB1, 0); /* SPI1_MOSI */
at91_set_A_periph(AT91_PIN_PB2, 0); /* SPI1_SPCK */

at91_clock_associate("spi1_clk", &at91sam9260_spi1_device.dev, "spi_clk");
platform_device_register(&at91sam9260_spi1_device);
}
}
#else
void __init at91_add_device_spi(struct spi_board_info *devices, int nr_devices) {}
#endif

in dmesg :
brd: module loaded
loop: module loaded
atmel_spi atmel_spi.1: Atmel SPI Controller at 0xfffcc000 (irq 13)
MACB_mii_bus: probed

in dev appares spidev1.0
if I try to run ./devspi_test it's run but in the scope SPI analyzer nothing appears.
suggestions??????
Author:  m-i-k-e.rm [ Wed Mar 10, 2010 6:04 pm ]
Post subject:  Re: configure spi
Hi federicololli,

according to a post on the following forum you have to adapt the spidev_test.c.

http://forum.embedded-projects.net/view ... hp?id=1271

****************************************
Edit the test-programm "spidev_test.c"
****************************************
struct spi_ioc_transfer tr = {
.tx_buf = (unsigned long)tx,
.rx_buf = (unsigned long)rx,
.len = ARRAY_SIZE(tx),
.delay_usecs = (int) NULL,
.speed_hz = (int) NULL,
.bits_per_word = (int) NULL,
};
****************************************

Michael
Author:  federicololli [ Fri Mar 12, 2010 2:03 pm ]
Post subject:  Re: configure spi
good thanks! work :D
Author:  federicololli [ Fri Mar 12, 2010 6:35 pm ]
Post subject:  Re: configure spi
is possible to reduce the speed of the SPI CLK at 500kHz?
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