[ECOS] RE: SPI problem on AT91EB55

["Nicolas Brouard" <nicolas dot brouard at silicomp dot ca>]

Maybe try to reduce the baudrate. Use 50000 or 500000 instead of 3000000 to
see the signal easily with the scope.
Put an infinite loop to send data during a long time in order to be able to
setup your scope. 

Nicolas

-----Original Message-----
From: Julien Stéphane [mailto:Stephane.Julien@he-arc.ch] 
Sent: Tuesday, February 27, 2007 04:26
To: ecos-discuss@ecos.sourceware.org
Cc: Etique Philippe
Subject: SPI problem on AT91EB55

Hy everybody,
 
I have problems for programming SPI on AT91EB55. I have plugged an
oscilloscope to the corresponding pins of I/O extension connector and
nothing come to the pins. Does it come from a driver problem or an error in
code? I have checked the connections. Here is part of my code : 
 
----------------------------------------------------------------------------
--------------------------------
#include <stdio.h>
#include <cyg/hal/hal_diag.h>
#include <cyg/io/spi.h>
#include <cyg/io/spi_at91.h>
#include <cyg/io/spi_eb55.h>
 
#define DEV_NUM 4 //default 0
#define CL_POL 1 //default 1 / mode3=1
#define CL_PHA 1 //default 0 / mode3=1
#define CL_BRATE 3000000 //default 8192000, 2000000?, 3000000?
#define CS_UP_UDLY 1 //default 1
#define CS_DW_UDLY 1 //default 1
#define TR_BT_UDLY 1 //default 1
 
static cyg_spi_at91_device_t spi_eb55_device CYG_SPI_DEVICE_ON_BUS(DEV_NUM)
= //CYG_SPI_DEVICE_ON_BUS(0)
{
    .spi_device.spi_bus = &cyg_spi_at91_bus.spi_bus,
    .dev_num     = DEV_NUM,          // Device number
    .cl_pol      = CL_POL,           // Clock polarity (0 or 1)
    .cl_pha      = CL_PHA,           // Clock phase (0 or 1)
    .cl_brate    = CL_BRATE,         // Clock baud rate
    .cs_up_udly  = CS_UP_UDLY,       // Delay in usec between CS up and
transfer start
    .cs_dw_udly  = CS_DW_UDLY,       // Delay in usec between transfer end
and CS down
    .tr_bt_udly  = TR_BT_UDLY        // Delay in usec between two transfers
};
 
cyg_spi_device *cyg_spi_eb55_device = &spi_eb55_device.spi_device;
 
int main(void)
{
    cyg_uint8 tx_data0, tx_data1, tx_data2, tx_data3;
    cyg_uint8 rx_data;
    
    printf("Entering application !\n");
    hal_diag_led(0x0);
    
    tx_data0=0x0;
    tx_data1=0x1;
    tx_data2=0x90;
    tx_data3=0x15;
        
    printf("Sending data...\n");
    cyg_spi_transfer(cyg_spi_eb55_device, 0, 1, &tx_data0, &rx_data);
    printf("Datas deceived : %i\n",rx_data);
    cyg_spi_transfer(cyg_spi_eb55_device, 0, 1, &tx_data1, &rx_data);
    printf("Datas deceived : %i\n",rx_data);
    cyg_spi_transfer(cyg_spi_eb55_device, 0, 1, &tx_data2, &rx_data);
    printf("Datas deceived : %i\n",rx_data);
    cyg_spi_transfer(cyg_spi_eb55_device, 0, 1, &tx_data3, &rx_data);
    printf("Datas deceived : %i\n",rx_data);
    
    cyg_spi_tick(cyg_spi_eb55_device, 0, 1000);
    
    printf("End of main !\n");
    //cyg_thread_exit();
}



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