Hello.
I am sorry for the long message.
Currently we are stuck at trying to interface ADXl345 via SPI to our zedboard.
We have successfully worked with I2C and GPIOs using, the MIO connected to the PS directly (JE1 -8) , using EMIO and using IPs implemented on the PL. But SPI is proving to be a hurdle that we are unable to cross.
I can provide the following information about it so far:
We are trying to interface an adxl345 with the zedboard with petalinux installed on it. We are letting the petalinux tools take care of generating the files of the device tree. We have changed the settings in the kernel configuration and included the necessary driver for adxl345-spi (already included in the Kernel) and the user-space driver for spidev.
In the hardware design we have enabled SPI1 from 10-15 to access PS SPI via JE PMODs. We have enabled SPI0 to access from EMIO, mapped to JA PMODs and we have included AXI-QSPI IP and mapped it to JB PMODs.
Petalinux creates multiple device tree files, including the following:
pcw.dtsi, pl.dtsi, skeleton.dtsi, system-conf.dtsi, system-top.dts, zynq-7000.dtsi
I have copied the system-top.dts, pcw.dtsi and zynq-7000.dtsi here.
system-top.dts
/dts-v1/;
/include/ "system-conf.dtsi"
/ {
amba: amba {
compatible = "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
interrupt-parent = <&intc>;
ranges;
spi1: spi@e0007000 {
compatible = "cdns,spi-r1p6";
reg = <0xe0007000 0x1000>;
status = "okay";
interrupt-parent = <&intc>;
interrupts = <0 49 4>;
clocks = <&clkc 26>, <&clkc 35>;
clock-names = "ref_clk", "pclk";
#address-cells = <1>;
#size-cells = <0>;
spidev@0{
compatible="spidev";
reg =<0>; //chipselect 0
spi-max-frequency= <50000000>;
};
spidev@1{
compatible="spidev";
reg =<1>; //chipselect 1
spi-max-frequency= <50000000>;
};
adxl345@2 {
compatible = "adi,adxl34x";
reg = <2>;
spi-max-frequency = <1000000>;
spi-cpha;
spi-cpol;
//interrupt-parent = <&gic>;
interrupts = < 0 32 4 >;
};
};
};
};
pcw.dtsi
/*
* CAUTION: This file is automatically generated by Xilinx.
* Version: HSI
* Today is: Sat Jun 18 15:26:06 2016
*/
/ {
cpus {
cpu@0 {
operating-points = <666666 1000000 333333 1000000>;
};
};
};
&gem0 {
phy-mode = "rgmii-id";
status = "okay";
xlnx,ptp-enet-clock = <0x69f6bcb>;
ps7_ethernet_0_mdio: mdio {
#address-cells = <1>;
#size-cells = <0>;
};
};
&gpio0 {
emio-gpio-width = <64>;
gpio-mask-high = <0x0>;
gpio-mask-low = <0x5600>;
};
&intc {
num_cpus = <2>;
num_interrupts = <96>;
};
&qspi {
is-dual = <0>;
num-cs = <1>;
status = "okay";
};
&sdhci0 {
clock-frequency = <50000000>;
status = "okay";
};
&spi1 {
is-decoded-cs = <0>;
num-cs = <3>;
status = "okay";
};
&uart1 {
current-speed = <115200>;
device_type = "serial";
port-number = <0>;
status = "okay";
};
&usb0 {
dr_mode = "host";
phy_type = "ulpi";
status = "okay";
};
&clkc {
fclk-enable = <0x1>;
ps-clk-frequency = <33333333>;
};
zynq-7000.dtsi
/*
* Copyright (C) 2011 - 2014 Xilinx
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/include/ "skeleton.dtsi"
/ {
compatible = "xlnx,zynq-7000";
cpus {
#address-cells = <1>;
#size-cells = <0>;
cpu@0 {
compatible = "arm,cortex-a9";
device_type = "cpu";
reg = <0>;
clocks = <&clkc 3>;
clock-latency = <1000>;
cpu0-supply = <®ulator_vccpint>;
operating-points = <
/* kHz uV */
666667 1000000
333334 1000000
>;
};
cpu@1 {
compatible = "arm,cortex-a9";
device_type = "cpu";
reg = <1>;
clocks = <&clkc 3>;
};
};
pmu {
compatible = "arm,cortex-a9-pmu";
interrupts = <0 5 4>, <0 6 4>;
interrupt-parent = <&intc>;
reg = < 0xf8891000 0x1000 0xf8893000 0x1000 >;
};
regulator_vccpint: fixedregulator@0 {
compatible = "regulator-fixed";
regulator-name = "VCCPINT";
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
regulator-boot-on;
regulator-always-on;
};
amba: amba {
compatible = "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
interrupt-parent = <&intc>;
ranges;
adc: adc@f8007100 {
compatible = "xlnx,zynq-xadc-1.00.a";
reg = <0xf8007100 0x20>;
interrupts = <0 7 4>;
interrupt-parent = <&intc>;
clocks = <&clkc 12>;
};
can0: can@e0008000 {
compatible = "xlnx,zynq-can-1.0";
status = "disabled";
clocks = <&clkc 19>, <&clkc 36>;
clock-names = "can_clk", "pclk";
reg = <0xe0008000 0x1000>;
interrupts = <0 28 4>;
interrupt-parent = <&intc>;
tx-fifo-depth = <0x40>;
rx-fifo-depth = <0x40>;
};
can1: can@e0009000 {
compatible = "xlnx,zynq-can-1.0";
status = "disabled";
clocks = <&clkc 20>, <&clkc 37>;
clock-names = "can_clk", "pclk";
reg = <0xe0009000 0x1000>;
interrupts = <0 51 4>;
interrupt-parent = <&intc>;
tx-fifo-depth = <0x40>;
rx-fifo-depth = <0x40>;
};
gpio0: gpio@e000a000 {
compatible = "xlnx,zynq-gpio-1.0";
#gpio-cells = <2>;
clocks = <&clkc 42>;
gpio-controller;
interrupt-parent = <&intc>;
interrupts = <0 20 4>;
reg = <0xe000a000 0x1000>;
};
i2c0: i2c@e0004000 {
compatible = "cdns,i2c-r1p10";
status = "disabled";
clocks = <&clkc 38>;
interrupt-parent = <&intc>;
interrupts = <0 25 4>;
reg = <0xe0004000 0x1000>;
#address-cells = <1>;
#size-cells = <0>;
};
i2c1: i2c@e0005000 {
compatible = "cdns,i2c-r1p10";
status = "disabled";
clocks = <&clkc 39>;
interrupt-parent = <&intc>;
interrupts = <0 48 4>;
reg = <0xe0005000 0x1000>;
#address-cells = <1>;
#size-cells = <0>;
};
intc: interrupt-controller@f8f01000 {
compatible = "arm,cortex-a9-gic";
#interrupt-cells = <3>;
interrupt-controller;
reg = <0xF8F01000 0x1000>,
<0xF8F00100 0x100>;
};
L2: cache-controller@f8f02000 {
compatible = "arm,pl310-cache";
reg = <0xF8F02000 0x1000>;
arm,data-latency = <3 2 2>;
arm,tag-latency = <2 2 2>;
cache-unified;
cache-level = <2>;
};
mc: memory-controller@f8006000 {
compatible = "xlnx,zynq-ddrc-a05";
reg = <0xf8006000 0x1000>;
};
ocmc: ocmc@f800c000 {
compatible = "xlnx,zynq-ocmc-1.0";
interrupt-parent = <&intc>;
interrupts = <0 3 4>;
reg = <0xf800c000 0x1000>;
};
uart0: serial@e0000000 {
compatible = "xlnx,xuartps", "cdns,uart-r1p8";
status = "disabled";
clocks = <&clkc 23>, <&clkc 40>;
clock-names = "uart_clk", "pclk";
reg = <0xE0000000 0x1000>;
interrupts = <0 27 4>;
};
uart1: serial@e0001000 {
compatible = "xlnx,xuartps", "cdns,uart-r1p8";
status = "disabled";
clocks = <&clkc 24>, <&clkc 41>;
clock-names = "uart_clk", "pclk";
reg = <0xE0001000 0x1000>;
interrupts = <0 50 4>;
};
spi0: spi@e0006000 {
compatible = "xlnx,zynq-spi-r1p6";
reg = <0xe0006000 0x1000>;
status = "disabled";
interrupt-parent = <&intc>;
interrupts = <0 26 4>;
clocks = <&clkc 25>, <&clkc 34>;
clock-names = "ref_clk", "pclk";
#address-cells = <1>;
#size-cells = <0>;
};
spi1: spi@e0007000 {
compatible = "xlnx,zynq-spi-r1p6";
reg = <0xe0007000 0x1000>;
status = "disabled";
interrupt-parent = <&intc>;
interrupts = <0 49 4>;
clocks = <&clkc 26>, <&clkc 35>;
clock-names = "ref_clk", "pclk";
#address-cells = <1>;
#size-cells = <0>;
};
qspi: spi@e000d000 {
clock-names = "ref_clk", "pclk";
clocks = <&clkc 10>, <&clkc 43>;
compatible = "xlnx,zynq-qspi-1.0";
status = "disabled";
interrupt-parent = <&intc>;
interrupts = <0 19 4>;
reg = <0xe000d000 0x1000>;
#address-cells = <1>;
#size-cells = <0>;
};
smcc: memory-controller@e000e000 {
#address-cells = <1>;
#size-cells = <1>;
status = "disabled";
clock-names = "memclk", "aclk";
clocks = <&clkc 11>, <&clkc 44>;
compatible = "arm,pl353-smc-r2p1";
interrupt-parent = <&intc>;
interrupts = <0 18 4>;
ranges ;
reg = <0xe000e000 0x1000>;
nand0: flash@e1000000 {
status = "disabled";
compatible = "arm,pl353-nand-r2p1";
reg = <0xe1000000 0x1000000>;
#address-cells = <0x1>;
#size-cells = <0x1>;
};
nor0: flash@e2000000 {
status = "disabled";
compatible = "cfi-flash";
reg = <0xe2000000 0x2000000>;
#address-cells = <1>;
#size-cells = <1>;
};
};
gem0: ethernet@e000b000 {
compatible = "cdns,gem";
reg = <0xe000b000 0x1000>;
status = "disabled";
interrupts = <0 22 4>;
clocks = <&clkc 30>, <&clkc 30>, <&clkc 13>;
clock-names = "pclk", "hclk", "tx_clk";
#address-cells = <1>;
#size-cells = <0>;
};
gem1: ethernet@e000c000 {
compatible = "cdns,gem";
reg = <0xe000c000 0x1000>;
status = "disabled";
interrupts = <0 45 4>;
clocks = <&clkc 31>, <&clkc 31>, <&clkc 14>;
clock-names = "pclk", "hclk", "tx_clk";
#address-cells = <1>;
#size-cells = <0>;
};
sdhci0: sdhci@e0100000 {
compatible = "arasan,sdhci-8.9a";
status = "disabled";
clock-names = "clk_xin", "clk_ahb";
clocks = <&clkc 21>, <&clkc 32>;
interrupt-parent = <&intc>;
interrupts = <0 24 4>;
reg = <0xe0100000 0x1000>;
};
sdhci1: sdhci@e0101000 {
compatible = "arasan,sdhci-8.9a";
status = "disabled";
clock-names = "clk_xin", "clk_ahb";
clocks = <&clkc 22>, <&clkc 33>;
interrupt-parent = <&intc>;
interrupts = <0 47 4>;
reg = <0xe0101000 0x1000>;
};
slcr: slcr@f8000000 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "xlnx,zynq-slcr", "syscon";
reg = <0xF8000000 0x1000>;
ranges;
clkc: clkc@100 {
#clock-cells = <1>;
compatible = "xlnx,ps7-clkc";
fclk-enable = <0xf>;
clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
"cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
"dci", "lqspi", "smc", "pcap", "gem0", "gem1",
"fclk0", "fclk1", "fclk2", "fclk3", "can0", "can1",
"sdio0", "sdio1", "uart0", "uart1", "spi0", "spi1",
"dma", "usb0_aper", "usb1_aper", "gem0_aper",
"gem1_aper", "sdio0_aper", "sdio1_aper",
"spi0_aper", "spi1_aper", "can0_aper", "can1_aper",
"i2c0_aper", "i2c1_aper", "uart0_aper", "uart1_aper",
"gpio_aper", "lqspi_aper", "smc_aper", "swdt",
"dbg_trc", "dbg_apb";
reg = <0x100 0x100>;
};
};
dmac_s: dmac@f8003000 {
compatible = "arm,pl330", "arm,primecell";
reg = <0xf8003000 0x1000>;
interrupt-parent = <&intc>;
interrupt-names = "abort", "dma0", "dma1", "dma2", "dma3",
"dma4", "dma5", "dma6", "dma7";
interrupts = <0 13 4>,
<0 14 4>, <0 15 4>,
<0 16 4>, <0 17 4>,
<0 40 4>, <0 41 4>,
<0 42 4>, <0 43 4>;
#dma-cells = <1>;
#dma-channels = <8>;
#dma-requests = <4>;
clocks = <&clkc 27>;
clock-names = "apb_pclk";
};
devcfg: devcfg@f8007000 {
clock-names = "ref_clk", "fclk0", "fclk1", "fclk2", "fclk3";
clocks = <&clkc 12>, <&clkc 15>, <&clkc 16>, <&clkc 17>, <&clkc 18>;
compatible = "xlnx,zynq-devcfg-1.0";
interrupt-parent = <&intc>;
interrupts = <0 8 4>;
reg = <0xf8007000 0x100>;
};
global_timer: timer@f8f00200 {
compatible = "arm,cortex-a9-global-timer";
reg = <0xf8f00200 0x20>;
interrupts = <1 11 0x301>;
interrupt-parent = <&intc>;
clocks = <&clkc 4>;
};
ttc0: timer@f8001000 {
interrupt-parent = <&intc>;
interrupts = <0 10 4>, <0 11 4>, <0 12 4>;
compatible = "cdns,ttc";
clocks = <&clkc 6>;
reg = <0xF8001000 0x1000>;
};
ttc1: timer@f8002000 {
interrupt-parent = <&intc>;
interrupts = <0 37 4>, <0 38 4>, <0 39 4>;
compatible = "cdns,ttc";
clocks = <&clkc 6>;
reg = <0xF8002000 0x1000>;
};
scutimer: timer@f8f00600 {
interrupt-parent = <&intc>;
interrupts = <1 13 0x301>;
compatible = "arm,cortex-a9-twd-timer";
reg = <0xf8f00600 0x20>;
clocks = <&clkc 4>;
};
usb0: usb@e0002000 {
compatible = "xlnx,zynq-usb-2.20a", "chipidea,usb2";
status = "disabled";
clocks = <&clkc 28>;
interrupt-parent = <&intc>;
interrupts = <0 21 4>;
reg = <0xe0002000 0x1000>;
phy_type = "ulpi";
};
usb1: usb@e0003000 {
compatible = "xlnx,zynq-usb-2.20a", "chipidea,usb2";
status = "disabled";
clocks = <&clkc 29>;
interrupt-parent = <&intc>;
interrupts = <0 44 4>;
reg = <0xe0003000 0x1000>;
phy_type = "ulpi";
};
watchdog0: watchdog@f8005000 {
clocks = <&clkc 45>;
compatible = "cdns,wdt-r1p2";
interrupt-parent = <&intc>;
interrupts = <0 9 1>;
reg = <0xf8005000 0x1000>;
timeout-sec = <10>;
};
};
};
ss[0] of the zedboard has been connected to Vcc. Now, we have tried two things"
1. We have attached the chip select to SS[1] hoping to use spidev. I think that echo hello > /dev/spidev32766.1 works but that could be only because we have included the things in the device tree and the corresponding file exists.
We tried running the standard spidev_test.c that gave the following result:
root@SPI:/bin# myapp -D /dev/spidev32766.1
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 KHz)
RX | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................................
But when we try to read back by doing the following, but to no avail:
root@SPI:/bin# myapp --loop /dev/spidev32766.1
can't open device: No such file or directory
Aborted
2.) Other than trying at spidev32766.1, there was also spi32766.2, but despite having the driver installed, we couldn't see the functions of the driver.
Other than using the PS SPI we have tried using the AXI QuadSPI IP in standard mode and used that to try to interface, but the driver functions are not visible. In this case we had changed the file pl.dtsi as below:
The changes in the device tree in all cases were made from from this link:
https://wiki.analog.com/resources/tools-software/linux-drivers/input-mis...
https://wiki.analog.com/resources/fpga/xilinx/pmod/adxl345
Any help will be greatly appreciated. We were able to access the same device using I2C so it is not a device issue.
I am sorry for the super long post but there was no attach button.
Thank you for your reply in advance.
Thanking You
Shubham Sharma
