ADS1292 interfacing with AM335x

Hi Brian,

Thanks for your reply.

We are trying to read registers of ADS1292 by referring code from the below link.
https://github.com/jdesbonnet/ADS1x9xECG/blob/master/raspi/ads1292.c

But unable to read registers. Read buff shows "FF". SPI driver configuration is done as follows

• /ti-sdk-am335x-evm-07.00.00.00/board-support/linux-3.12.10-ti2013.12.01/arch/arm/boot/dts/am335x-evmsk.dts
  
  spi0_pins: pinmux_spi0_pins {
              pinctrl-single,pins = <
                  0x150 (PIN_INPUT_PULLUP| MUX_MODE0)    /* spi0_clk.spi0_clk */
                  0x154 (PIN_INPUT_PULLUP | MUX_MODE0)    /* spi0_d0.spi0_d0 */
                  0x158 (PIN_INPUT_PULLUP| MUX_MODE0)    /* spi0_d1.spi0_d1 */
                  0x15c (PIN_INPUT_PULLUP| MUX_MODE0)    /* spi0_cs0.spi0_cs0 */
              >;
          };
  
          spi0: spi@48030000 {
              pinctrl-names = "default";
              pinctrl-0 = <&spi0_pins>;
              reg = <0x48030000 0x400>;
              #address-cells = <1>;
              #size-cells = <0>;
              interrupts = <65>;
              clocks = <&dpll_per_m2_div4_ck>;
              clock-names = "fck";
              ti,spi-num-cs = <2>;
              ti,hwmods = "spi0";
              dmas = <&edma 16
                  &edma 17
                  &edma 18
                  &edma 19>;
              dma-names = "tx0", "rx0", "tx1", "rx1";
              status = "okay";
              spidev: spidev@0 {
                  compatible = "linux,spidev";
                  spi-max-frequency = <24000000>;
                  reg = <0x0>;
                  spi-cpha;
              };
          };
  
  
• /ti-sdk-am335x-evm-07.00.00.00/board-support/linux-3.12.10-ti2013.12.01/arch/arm/mach-omap2/board-generic.c
  
  static struct spi_board_info am335x_spi0_slave_info __initdata = {
      .modalias        = "spidev",
      .bus_num        = 1,
      .chip_select        = 0,
      .max_speed_hz        = 48000000,
      .mode            = SPI_MODE_1,
  };
  
  

Note:

Using these setting and shorting DIN and DOUT pins of ADS1292 we are able to run spidev_test

root@am335x-evm:~# spidev_test -D /dev/spidev1.0 -H
spi mode: 1
bits per word: 8
max speed: 500000 Hz (500 KHz)
 
FF FF FF FF FF FF  
40 00 00 00 00 95  
FF FF FF FF FF FF  
FF FF FF FF FF FF  
FF FF FF FF FF FF  
DE AD BE EF BA AD  
F0 0D  

Kindly help us in going ahead and read register value of ADS1292.

Thanks and Regards,

Lahari P.

Thanks Brian, I will check signal and try to debug using oscilloscope.

Can you just let me know if my configuration settings are proper in am335x-evmsk.dts and board-generic.c file? Am I missing something in initializing? Kindly guide me.

Regards,

Lahari P.