SPI

'ODROID-N2' on this page refers to the ODROID-N2 series (N2, N2+, N2L).

If you have the kernel version in the following list, you have to use the Device Tree Overlay to enable the GPIO functions.
- ODROID-XU4: 5.4 or above.
- ODROID-N2/N2+: 4.9.230 or above.
- ODROID-C4: 4.9.230 or above.
- ODROID-M1: 4.19.219 or above.
- Introduction of Device Tree Overlay: https://wiki.odroid.com/common/application_note/software/device_tree_overlay
- How to enable SPI/I2C/UART using Device Tree Overlay: https://wiki.odroid.com/common/application_note/gpio/enable_spi_i2c_uart_with_dtbo

Operation confirmed with our
- ODROID-XU4 on 4.14.40 kernel.
- ODROID-C1+ on 3.10.107 kernel.
- ODROID-C2 on 3.14.79 kernel.
- ODROID-N2 on 4.9.141 kernel.
- ODROID-C4 on 4.9.113 kernel.
- ODROID-M1 on 4.19.219 kernel.

This guide lets you know that how to make the SPI feature ready and that how to test the SPI feature including loopback test.

The SPI feature can be simply enabled by loading a module.

Load the modules with the following commands.

target

sudo modprobe spidev
sudo modprobe spi_s3c64xx

And you can check if the module loaded.

target

root@odroid:~# lsmod | grep spi
spidev                 20480  0
spi_s3c64xx            20480  0

And the device file /dev/spidev1.0 has been created as well.

target

root@odroid:~# ls /dev/spidev*
/dev/spidev1.0

Load the modules with the following commands.

target

sudo modprobe spidev
sudo modprobe spicc

And you can check if the module loaded.

target

root@odroid:~# lsmod | grep spi
spicc                   8279  0
spidev                  5442  0

And the device file /dev/spidev0.0 has been created as well.

target

root@odroid:~# ls /dev/spidev*
/dev/spidev0.0

Load the modules with the following commands.

target

sudo modprobe spidev
sudo modprobe spi_gpio
sudo modprobe spi_bitbang

And you can check if the module loaded.

target

root@odroid64:~# lsmod | grep spi
spi_gpio                6778  0
spi_bitbang             4063  1 spi_gpio
spidev                  6475  0

And the device file /dev/spidev0.0 has been created as well.

target

root@odroid64:~# ls /dev/spidev*
/dev/spidev0.0

Enable the modules using device-tree-compiler.

target

sudo apt install device-tree-compiler

Change the status to okay of the SPI nodes on the device tree.

target

# SPICC0
sudo fdtput -t s /media/boot/meson64_odroidn2.dtb /soc/cbus@ffd00000/spi@13000 status "okay"
 
# SPIDEV0
sudo fdtput -t s /media/boot/meson64_odroidn2.dtb /soc/cbus@ffd00000/spi@13000/spidev@0 status "okay"

Check if it changed.

target

# SPICC0
root@odroid:~# fdtget /media/boot/meson64_odroidn2.dtb /soc/cbus@ffd00000/spi@13000 status
okay
 
# SPIDEV0
root@odroid:~# fdtget /media/boot/meson64_odroidn2.dtb /soc/cbus@ffd00000/spi@13000/spidev@0 status
okay

Then reboot to apply the changes.

Then you can check if the modules loaded.

target

root@odroid:~# lsmod | grep spi
spidev                 20480  0
spi_meson_spicc        20480  0

Check the /dev/spidev0.0 file out as the below.

target

root@odroid:~# ls /dev/spidev*
/dev/spidev0.0

Enable the modules using device-tree-compiler.

target

sudo apt install device-tree-compiler

Change the status to okay of the SPI nodes on the device tree.

target

# SPICC0
sudo fdtput -t s /media/boot/meson64_odroidc4.dtb /soc/cbus@ffd00000/spi@13000 status "okay"
 
# SPIDEV0
sudo fdtput -t s /media/boot/meson64_odroidc4.dtb /soc/cbus@ffd00000/spi@13000/spidev@0 status "okay"

Check if it changed.

target

# SPICC0
root@odroid:~# fdtget /media/boot/meson64_odroidc4.dtb /soc/cbus@ffd00000/spi@13000 status
okay
 
# SPIDEV0
root@odroid:~# fdtget /media/boot/meson64_odroidc4.dtb /soc/cbus@ffd00000/spi@13000/spidev@0 status
okay

Then reboot to apply the changes.

Then you can check if the modules loaded.

target

root@odroid:~# lsmod | grep spi
spidev                 20480  0
spi_meson_spicc        20480  0

Check the /dev/spidev0.0 file out as the below.

target

root@odroid:~# ls /dev/spidev*
/dev/spidev0.0

Change the status to okay of the SPI nodes on the device tree.

target

sudo fdtput -t s /boot/dtbs/4.19.219-odroid-arm64/rockchip/rk3568-odroid-m1.dtb spi0 status "okay"

Check if it changed.

target

root@odroid:~# fdtget -t s /boot/dtbs/4.19.219-odroid-arm64/rockchip/rk3568-odroid-m1.dtb spi0 status
okay

Then reboot to apply the changes.

Check the /dev/spidev0.0 file out as the below.

target

$ ls /dev/spidev*
/dev/spidev0.0

You can use the wild card character(*) when you select spidev file, but be careful with using that due to the unexpected situation on your board.
This guide uses the wild card to give you the unified simple instruction for those 3 boards.

Download a source code and compile.

target

sudo wget http://dn.odroid.com/Accessory/examples/spidev_test.c
sudo gcc -o spidev_test spidev_test.c

The help of the test utility.

target

# There's no option to show the help on this file.
# It shows if you enter this command with invalid arguments.
# So the '--help' option will show the help.
root@odroid:~# ./spidev_test --help
./spidev_test: unrecognized option '--help'
Usage: ./spidev_test [-DsbdlHOLC3]
  -D --device   device to use (default /dev/spidev1.1)
  -s --speed    max speed (Hz)
  -d --delay    delay (usec)
  -b --bpw      bits per word 
  -l --loop     loopback
  -H --cpha     clock phase
  -O --cpol     clock polarity
  -L --lsb      least significant bit first
  -C --cs-high  chip select active high
  -3 --3wire    SI/SO signals shared

Even though you haven't any SPI hardware device, you can test if the SPI feature works with a jump cable.

Before testing, make sure that a jump cable is connected between SPI MOSI and MISO pin directly.

Connect between pin #19 and #21.

If you use XU4 without Shifter Shield, use pin #7 and #9 at CON10 pin header.

Please refer to each wiki page about expansion connectors.

ODROID-XU4

CON 10 - 2x15 pins

Default Pin State	GPIO & Export No	Net Name	Pin Number	Pin Number	Net Name	GPIO & Export No	Default Pin State
-	-	5V0	1	2	GND	-	-
I	XADC0AIN_0	ADC_0.AIN0	3	4	UART_0.CTSN	GPA0.2 (#173)	I(PUDN)
I(PUDN)	GPA0.3 (#174)	UART_0.RTSN	5	6	UART_0.RXD	GPA0.0 (#171)	I(PUDN)
I(PUDN)	GPA2.7 (#192)	SPI_1.MOISI	7	8	UART_0.TXD	GPA0.1 (#172)	I(PUDN)
I(PUDN)	GPA2.6 (#191)	SPI_1.MISO	9	10	SPI_1.CLK	GPA2.4 (#189)	I(PUDN)
I(PUDN)	GPA2.5 (#190)	SPI_1.CSN	11	12	PWRON	Input Range (1.8V ~ 5V)	I
I(PUDN)	GPX1.5 (#21)	XE.INT13	13	14	I2C_1.SCL	GPB3.3 (#210)	I(PUDN)
I(PUDN)	GPX1.2 (#18)	XE.INT10	15	16	I2C_1.SDA	GPB3.2 (#209)	I(PUDN)
I(PUDN)	GPX1.6 (#22)	XE.INT14	17	18	XE.INT11	GPX1.3 (#19)	I(PUDN)
I(PUDN)	GPX2.6 (#30)	XE.INT22	19	20	XE.INT20	GPX2.4 (#28)	I(PUDN)
I(PUDN)	GPX2.5 (#29)	XE.INT21	21	22	XE.INT23	GPX2.7 (#31)	I(PUDN)
I	XADC0AIN_3	ADC_0.AIN3	23	24	XE.INT17	GPX2.1 (#25)	I(PUDN)
I(PUDN)	GPX1.7 (#23)	XE.INT15	25	26	XE.INT16	GPX2.0 (#24)	I(PUDN)
I(PUDN)	GPX3.1 (#33)	XE.INT25	27	28	GND	-	-
-	-	VDD_IO(1.8V)	29	30	GND	-	-

2017/07/24 17:40 · luke.go

ODROID-XU4 with Shifter Shield

GPIO Map for WiringPi Library (Shifter-Shield 40 Pin)

GPIO	WiringPi	Name	Mode	Initial Level	Header Pin	Header Pin	Initial Level	Mode	Name	WiringPi	GPIO
		3.3V			1	2			5v
209	8	I2C1.SDA	ALT1	1	3	4			5v
210	9	I2C1.SCL	ALT1	1	5	6			0v
18	7	GPIO. 18	IN	1	7	8	1	ALT1	UART0.TX	15	172
		0v			9	10	1	ALT1	UART0.RX	16	171
174	0	GPIO.174	ALT1	1	11	12	1	ALT1	GPIO.173	1	173
21	2	GPIO. 21	IN	1	13	14			0v
22	3	GPIO. 22	IN	1	15	16	1	IN	GPIO. 19	4	19
		3.3v			17	18	1	IN	GPIO. 23	5	23
192	12	MOSI	ALT1	1	19	20			0v
191	13	MISO	ALT1	1	21	22	1	IN	GPIO. 24	6	24
189		SCLK	ALT1	0	23	24	1	OUT	CE0	10	190
		0v			25	26	1	OUT	GPIO. 25	11	25
187	30	I2C5.SDA	ALT2	1	27	28	1	ALT2	I2C_5.SCL	31	188
28	21	GPIO. 28	IN	1	29	30			0v
30	22	GPIO. 30	IN	1	31	32	1	IN	GPIO. 29	26	29
31	23	GPIO. 31	IN	1	33	34			0v
	24	POWER ON			35	36	1	IN	GPIO. 33	27	33
	25	AIN.0			37	38			1v8	28
		0v			39	40			AIN.3	29

The “gpio readall” shows the pin-map of 40-pin-Shifter-Shield not 30-Pin-header.

PCB Layout for pin map

2017/07/24 17:40 · luke.go

ODROID-C1

J2 - 2x20 PINS

GPIO	wPi	Name	Alternative/ Driving Capability	Mode	V	PU/PD	PIN	PIN	PU/PD	V	Mode	Alternative/ Driving Capability	Name	wPi	GPIO
-	-	3.3V	-	-	-	-	1	2	-	-	-	-	5.0V	-	-
74	-	I2CA_SDA	-	IN	1	-	3	4	-	-	-	-	5.0V	-	-
75	-	I2CA_SCL	-	IN	1	-	5	6	-	-	-	-	GND	-	-
83	7	GPIOY.3	-/2mA	IN	0	P/U	7	8	P/U	1	ALT1	-	GPIOX.16	-	113
-	-	GND	-	-	-	-	9	10	P/U	1	ALT1	-	GPIOX.17	-	114
88	0	GPIOY.8	-/3mA	IN	1	P/U	11	12	P/U	0	IN	-/2mA	GPIOY.7	1	87
116	2	GPIOX.19	-/2mA	IN	1	P/U	13	14	-	-	-	-	GND	-	-
115	3	GPIOX.18	-/2mA	IN	0	P/D	15	16	P/U	1	IN	-/3mA	GPIOX.7	4	104
-	-	3.3V	-	-	-	-	17	18	P/U	1	IN	-/3mA	GPIOX.5	5	102
107	12	GPIOX.10	PWM1/2mA	IN	1	P/U	19	20	-	-	-	-	GND	-	-
106	13	GPIOX.9	-/3mA	IN	1	P/U	21	22	P/U	1	IN	-/3mA	GPIOX.6	6	103
105	14	GPIOX.8	-/4mA	IN	1	P/U	23	24	P/D	0	IN	-/2mA	GPIOX.20	10	117
-	-	GND	-	-	-	-	25	26	P/U	1	IN	-	GPIOX.21	11	118
76	-	I2CB_SDA	-	IN	1	-	27	28	-	1	IN	-	I2CB_SCL	-	77
101	21	GPIOX.4	-/3mA	IN	1	P/U	29	30	-	-	-	-	GND	-	-
100	22	GPIOX.3	-/3mA	IN	1	P/U	31	32	P/U	1	IN	-/3mA	GPIOX.2	26	99
108	23	GPIOX.11	PWM0/3mA	IN	0	P/D	33	34	-	-	-	-	GND	-	-
97	24	GPIOX.0	-/3mA	IN	1	P/U	35	36	P/U	1	IN	-/3mA	GPIOX.1	27	98
-	-	ADC.AIN0	10bit ADC#1(0~1.8V)	-	-	-	37	38	-	-	-	Output!	1.8V REF	-	-
-	-	GND	-	-	-	-	39	40	-	-	-	10bit ADC#0 (0~1.8V)	ADC.AIN1	-	-

2017/09/27 17:47 · luke.go

ODROID-C2

J2 - 2x20 PINS

GPIO	wPi	Name	Alternative	Mode	V	PU/PD	PIN	PIN	PU/PD	V	Mode	Alternative	Name	wPi	GPIO
-	-	3.3V	-	-	-	-	1	2	-	-	-	-	5.0V	-	-
205	-	I2CA_SDA	-	IN	1	-	3	4	-	-	-	-	5.0V	-	-
206	-	I2CA_SCL	-	IN	1	-	5	6	-	-	-	-	GND	-	-
249	7	GPIOX.21	-	IN	1	P/U	7	8	P/U	1	ALT2	/dev/ttyS1	TXD1	-	240
-	-	GND	-	-	-	-	9	10	P/U	1	ALT2	/dev/ttyS1	RXD1	-	241
247	0	GPIOX.19	-	IN	1	P/U	11	12	P/D	0	IN	-	GPIOX.10	1	238
239	2	GPIOX.11	-	IN	1	P/U	13	14	-	-	-	-	GND	-	-
237	3	GPIOX.9	-	IN	1	P/U	15	16	P/U	1	IN	-	GPIOX.8	4	236
-	-	3.3V	-	-	-	-	17	18	P/U	1	IN	-	GPIOX.5	5	233
235	12	GPIOX.7	PWM1	IN	1	P/U	19	20	-	-	-	-	GND	-	-
232	13	GPIOX.4	-	IN	1	P/U	21	22	P/U	1	IN	-	GPIOX.3	6	231
230	14	GPIOX.2	-	IN	1	P/U	23	24	P/U	1	IN	-	GPIOX.1	10	229
-	-	GND	-	-	-	-	25	26	P/D	0	IN	-	GPIOY.14	11	225
207	-	I2CB_SDA	-	IN	1	-	27	28	-	1	IN	-	I2CB_SCL	-	208
228	21	GPIOX.0	-	IN	1	P/U	29	30	-	-	-	-	GND	-	-
219	22	GPIOY.8	-	IN	1	P/U	31	32	P/U	1	IN	-	GPIOY.13	26	224
234	23	GPIOX.6	PWM0	IN	0	P/D	33	34	-	-	-	-	GND	-	-
214	24	GPIOY.3	-	IN	1	P/U	35	36	P/U	1	IN	-	GPIOY.7	27	218
-	-	ADC.AIN1	10bit ADC (0~1.8V)	-	-	-	37	38	-	-	-	-	1.8V REF	-	-
-	-	GND	-	-	-	-	39	40	-	-	-	10bit ADC(00~1.8V)	ADC.AIN0	-	-

2017/06/16 17:01 · luke.go

ODROID-N2

J2 - 2x20 PINS

Default Pin State	GPIO & Export No	Net Name	Pin Number	Pin Number	Net Name	GPIO & Export No	Default Pin State
-	-	3.3V	1	2	5.0V	-	-
I(P/D)	GPIOX.17 (#493)	I2C0_SDA	3	4	5.0V	-	-
I(P/U)	GPIOX.18 (#494)	I2C0_SCL	5	6	GND	-	-
I(P/D)	GPIOA.13 (#473)		7	8	TXD1	GPIOX.12 (#488)	I(P/U)
-	-	GND	9	10	RXD1	GPIOX.13 (#489)	I(P/U)
I(P/U)	GPIOX.3 (#479)		11	12	PWM_E	GPIOX.16 (#492)	I(P/U)
I(P/U)	GPIOX.4 (#480)		13	14	GND	-	-
I(P/U)	GPIOX.7 (#483)	PWM_F	15	16		GPIOX.0 (#476)	I(P/U)
-	-	3.3V	17	18		GPIOX.1 (#477)	I(P/U)
I(P/U)	GPIOX.8 (#484)	SPI0_MOSI	19	20	GND	-	-
I(P/U)	GPIOX.9 (#485)	SPI0_MISO	21	22		GPIOX.2 (#478)	I(P/U)
I(P/U)	GPIOX.11 (#487)	SPI0_CLK	23	24	SPI0_SS0	GPIOX.10 (#486)	I(P/U)
-	-	GND	25	26	SPI0_SS1	GPIOA.4 (#464)	I(P/D)
I(P/U)	GPIOA.14 (#474)	I2C1_SDA	27	28	I2C1_SCL	GPIOA.15 (#475)	I(P/U)
I(P/U)	GPIOX.14 (#490)		29	30	GND	-	-
I(P/U)	GPIOX.15 (#491)		31	32		GPIOA.12 (#472)	I(P/D)
I(P/U)	GPIOX.5 (#481)	PWM_C	33	34	GND	-	-
I(P/D)	GPIOX.6 (#482)	PWM_D	35	36		GPIOX.19 (#495)	-
		ADC.AIN3	37	38	REF 1.8V
-	-	GND	39	40	ADC.AIN2

2018/12/17 12:20 · luke.go

ODROID-C4

J2 - 2x20 PINS

Default Pin State	GPIO & Export No	Net Name	Pin Number	Pin Number	Net Name	GPIO & Export No	Default Pin State
-	-	3.3V	1	2	5.0V	-	-
I(P/D)	GPIOX.17 (#493)	I2C0_SDA	3	4	5.0V	-	-
I(P/U)	GPIOX.18 (#494)	I2C0_SCL	5	6	GND	-	-
I(P/D)	GPIOX.5 (#481)	PWM_C	7	8	TXD1	GPIOX.12 (#488)	I(P/U)
-	-	GND	9	10	RXD1	GPIOX.13 (#489)	I(P/U)
I(P/U)	GPIOX.3 (#479)	PWM_D	11	12	PWM_E	GPIOX.16 (#492)	I(P/U)
I(P/U)	GPIOX.4 (#480)		13	14	GND	-	-
I(P/U)	GPIOX.7 (#483)	PWM_F	15	16		GPIOX.0 (#476)	I(P/U)
-	-	3.3V	17	18		GPIOX.1 (#477)	I(P/U)
I(P/U)	GPIOX.8 (#484)	SPI0_MOSI	19	20	GND	-	-
I(P/U)	GPIOX.9 (#485)	SPI0_MISO	21	22		GPIOX.2 (#478)	I(P/U)
I(P/U)	GPIOX.11 (#487)	SPI0_SCLK	23	24	SPI0_CS0	GPIOX.10 (#486)	I(P/U)
-	-	GND	25	26	SPI0_CS1	GPIOH.6 (#433)	I(P/D)
I(P/U)	GPIOA.14 (#474)	I2C1_SDA	27	28	I2C1_SCL	GPIOA.15 (#475)	I(P/U)
I(P/U)	GPIOX.14 (#490)		29	30	GND	-	-
I(P/U)	GPIOX.15 (#491)		31	32		GPIOH.7 (#434)	I(P/D)
I(P/U)	GPIOX.6 (#482)	PWM_A	33	34	GND	-	-
I(P/D)	GPIOX.19 (#495)	PWM_B	35	36		GPIOH.5 (#432)	-
		ADC.AIN2	37	38	REF 1.8V
-	-	GND	39	40	ADC.AIN0

2019/10/29 16:27 · luke.go

ODROID-M1

J1 - 2x20 PINS

Default Pin State	GPIO & Export No	Net Name	Pin Number	Pin Number	Net Name	GPIO & Export No	Default Pin State
-	-	3.3V	1	2	5.0V	-	-
I(P/D)	GPIO3B.6 (#110)	I2C0_SDA	3	4	5.0V	-	-
I(P/U)	GPIO3B.5 (#109)	I2C0_SCL	5	6	GND	-	-
I(P/D)	GPIO0B.6 (#14)		7	8	UART1_TX	GPIO3D.6 (#126)	I(P/U)
-	-	GND	9	10	UART1_RX	GPIO3D.7 (#127)	I(P/U)
I(P/U)	GPIO0C.0 (#16)	UART0_RX	11	12		GPIO3D.0 (#120)	I(P/U)
I(P/U)	GPIO0C.1 (#17)	UART0_TX	13	14	GND	-	-
I(P/U)	GPIO3B.2 (#106)		15	16		GPIO3C.6 (#118)	I(P/U)
-	-	3.3V	17	18		GPIO3C.7 (#119)	I(P/U)
I(P/U)	GPIO2D.1 (#89)	SPI0_MOSI	19	20	GND	-	-
I(P/U)	GPIO2D.0 (#88)	SPI0_MISO	21	22		GPIO3D.1 (#121)	I(P/U)
I(P/U)	GPIO2D.3 (#91)	SPI0_SCLK	23	24	SPI0_CS0	GPIO2D.2 (#90)	I(P/U)
-	-	GND	25	26		GPIO3D.2 (#122)	I(P/D)
I(P/U)	GPIO0B.4 (#12)	I2C1_SDA	27	28	I2C1_SCL	GPIO0B.3 (#11)	I(P/U)
I(P/U)	GPIO4C.1 (#145)	UART1_CTS	29	30	GND	-	-
I(P/U)	GPIO4B.6 (#142)	UART1_RTS	31	32		GPIO3D.3 (#123)	I(P/D)
I(P/U)	GPIO0B.5 (#13)		33	34	GND	-	-
I(P/D)	GPIO3D.5 (#125)		35	36		GPIO3D.4 (#124)	-
		ADC.AIN1	37	38	REF 1.8V
-	-	GND	39	40	ADC.AIN0

2022/01/06 15:10 · neal

Run to test.
The spidev number is different by which board you use.

XU4: /dev/spidev1.0
C1+/C2: /dev/spidev0.0
N2/C4: /dev/spidev0.0
M1: /dev/spidev0.0

ODROID-XU4

target

root@odroid:~# ./spidev_test -D /dev/spidev1.0

ODROID-C1+

target

root@odroid:~# ./spidev_test -D /dev/spidev0.0

ODROID-C2

target

root@odroid64:~# ./spidev_test -D /dev/spidev0.0

ODROID-N2

target

root@odroid:~# ./spidev_test -D /dev/spidev0.0

ODROID-C4

target

root@odroid:~# ./spidev_test -D /dev/spidev0.0

ODROID-M1

target

root@odroid:~# ./spidev_test -D /dev/spidev0.0

These results should be the same.

target

root@odroid:~# ./spidev_test -D /dev/spidev*
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)
 
01 02 03 04

If the module isn't loaded and/or spidev file isn't created, it results like the below.

target

root@odroid:~# ./spidev_test -D /dev/spidev*
can't open device: No such file or directory
Aborted

If the jump cable isn't connected well, it results like the below.

target

root@odroid:~# ./spidev_test -D /dev/spidev*
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)
 
FF FF FF FF

Bits per word

8 bits

1MHz max speed and 8 bits per word.

target

root@odroid:~# ./spidev_test -D /dev/spidev* -s 1000000 -b 8
spi mode: 0
bits per word: 8
max speed: 1000000 Hz (1000 KHz)

16 bits

1MHz max speed and 16 bits per word.

target

root@odroid:~# ./spidev_test -D /dev/spidev* -s 1000000 -b 16
spi mode: 0
bits per word: 16
max speed: 1000000 Hz (1000 KHz)

32 bits

1MHz max speed and 32 bits per word.

target

root@odroid:~# ./spidev_test -D /dev/spidev* -s 1000000 -b 32
spi mode: 0
bits per word: 32
max speed: 1000000 Hz (1000 KHz)

SPI mode

Mode 0

1MHz max speed, 32 bits per word and SPI mode 0.

target

root@odroid:~# ./spidev_test -D /dev/spidev* -s 1000000 -b 32
spi mode: 0
bits per word: 32
max speed: 1000000 Hz (1000 KHz)

Mode 1

1MHz max speed, 32 bits per word and SPI mode 1.

target

root@odroid:~# ./spidev_test -D /dev/spidev* -s 1000000 -b 32 -H
spi mode: 1
bits per word: 32
max speed: 1000000 Hz (1000 KHz)

Mode 2

1MHz max speed, 32 bits per word and SPI mode 2.

target

root@odroid:~# ./spidev_test -D /dev/spidev* -s 1000000 -b 32 -O
spi mode: 2
bits per word: 32
max speed: 1000000 Hz (1000 KHz)

Mode 3

1MHz max speed, 32 bits per word and SPI mode 3.

target

root@odroid:~# ./spidev_test -D /dev/spidev* -s 1000000 -b 32 -H -O
spi mode: 3
bits per word: 32
max speed: 1000000 Hz (1000 KHz)

[1] https://www.kernel.org/doc/Documentation/spi/spi-summary

2020/03/18 14:31 · luke.go

SPI

Enable the SPI feature on your board

ODROID-XU4

ODROID-C1+

ODROID-C2

ODROID-N2

ODROID-C4

ODROID-M1

Test if the SPI feature works

Preparation

Loopback test

ODROID-XU4

CON 10 - 2x15 pins

ODROID-XU4 with Shifter Shield

GPIO Map for WiringPi Library (Shifter-Shield 40 Pin)

ODROID-C1

J2 - 2x20 PINS

ODROID-C2

J2 - 2x20 PINS

ODROID-N2

J2 - 2x20 PINS

ODROID-C4

J2 - 2x20 PINS

ODROID-M1

J1 - 2x20 PINS

ODROID-XU4

ODROID-C1+

ODROID-C2

ODROID-N2

ODROID-C4

ODROID-M1

Various tests

Bits per word

8 bits

16 bits

32 bits

SPI mode

Mode 0

Mode 1

Mode 2

Mode 3

References