'ODROID-N2' on this page refers to the ODROID-N2 series (N2, N2+, N2L).
Hardware PWM
Introduction
For pin position, numbers and names, please refer to the pinmap.
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 |
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 |
ODROID-M1
Expansion Connectors
The ODROID-M1 provides 40-pin dual row expansion header “J1”.
The location and pinout of these connectors are illustrated below. (Board Revision 1.0 : 2021/11/12)
All signals on the expansion headers are 3.3V except for the analog input signal. The ADC inputs are limited to 1.8Volt.
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 |
GPIO Map for WiringPi Library
| GPIO | WiringPi | Name | Mode | Initial Level | Header Pin | Header Pin | Initial Level | Mode | Name | WiringPi | GPIO |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3.3V | 1 | 2 | 5v | ||||||||
| 110 | 8 | I2C.SDA0 | IN | 1 | 3 | 4 | 5v | ||||
| 109 | 9 | I2C.SCL0 | IN | 1 | 5 | 6 | GND | ||||
| 14 | 7 | GPIO.14 | IN | 1 | 7 | 8 | 1 | IN | TxD1 | 15 | 126 |
| GND | 9 | 10 | 1 | IN | TxR1 | 16 | 127 | ||||
| 16 | 0 | GPIO.16 | IN | 1 | 11 | 12 | 1 | IN | GPIO.120 | 1 | 120 |
| 17 | 2 | GPIO.17 | IN | 1 | 13 | 14 | GND | ||||
| 106 | 3 | GPIO.106 | IN | 1 | 15 | 16 | 1 | IN | GPIO.118 | 4 | 118 |
| 3.3v | 17 | 18 | 1 | IN | GPIO.119 | 5 | 119 | ||||
| 89 | 12 | SPIO_MOSI | IN | 1 | 19 | 20 | GND | ||||
| 88 | 13 | SPIO_MISO | IN | 1 | 21 | 22 | 1 | IN | GPIO.121 | 6 | 121 |
| 91 | 14 | SPI_CLK | IN | 1 | 23 | 24 | 1 | IN | SPI_CE0 | 10 | 90 |
| GND | 25 | 26 | 1 | IN | GPIO.122 | 11 | 122 | ||||
| 12 | 30 | I2C.SDA1 | IN | 1 | 27 | 28 | 1 | IN | I2C_.SCL1 | 31 | 11 |
| 145 | 21 | GPIO.145 | IN | 1 | 29 | 30 | GND | ||||
| 142 | 22 | GPIO.142 | IN | 1 | 31 | 32 | 0 | IN | GPIO.123 | 26 | 123 |
| 13 | 23 | GPIO.13 | IN | 0 | 33 | 34 | GND | ||||
| 125 | 24 | GPIO.125 | IN | 0 | 35 | 36 | 1 | OUT | GPIO.124 | 27 | 124 |
| 25 | AIN.2 | 37 | 38 | 1.8V | 28 | ||||||
| GND | 39 | 40 | AIN.0 | 29 |
Enable PWM
Before using the PWM, you should enable the pwm by the dtbo.
Please check the DTBO page
PWM Hardware Pin-map
You can access each PWM pin using sysfs interface.
The following table shows the pwm pins availables.
ODROID-N2
The pwm chip number is based on the below table.
The top index show your dtbo selection.
The top index show your dtbo selection.
| PWM_CD Only | PWM_EF Only | PWM_CD & PWM_EF | |
|---|---|---|---|
| PWM_CD | pwmchip4 | X | pwmchip4 |
| PWM_EF | X | pwmchip4 | pwmchip8 |
| Hardware connection | Linux kernel sysfs control | ||||
|---|---|---|---|---|---|
| PWM | gpio | 40-pin num. | pwmchip | pwm_pins | export command /sys/class/pwm/ |
| PWM_C | GPIOX.5 | 33 | pwmchip<num> | 0 | echo 0 > pwmchip<num>/export |
| PWM_D | GPIOX.6 | 35 | pwmchip<num> | 1 | echo 1 > pwmchip<num>/export |
| PWM_E | GPIOX.16 | 12 | pwmchip<num> | 0 | echo 0 > pwmchip<num>/export |
| PWM_F | GPIOX.7 | 15 | pwmchip<num> | 1 | echo 1 > pwmchip<num>/export |
pwmchip#NUM can be found in /sys/class/pwm/
- target
root@odroid:~$ cd /sys/class/pwm/ root@odroid:/sys/class/pwm# ls pwmchip0 pwmchip12 pwmchip16 pwmchip4 pwmchip8 root@odroid:/sys/class/pwm#
ODROID-C4
The pwm chip number is based on the below table.
The top index show your dtbo selection.
The top index show your dtbo selection.
| PWM_AB Only | PWM_CD Only | PWM_EF Only | PWM_AB && PWM_CD | PWM_CD && PWM_EF | ||
|---|---|---|---|---|---|---|
| PWM_AB | pwmchip0 | X | X | pwmchip0 | X | pwmchip0 |
| PWM_CD | X | pwmchip0 | X | pwmchip4 | pwmchip0 | pwmchip4 |
| PWM_EF | X | X | pwmchip0 | X | pwmchip4 | pwmchip8 |
| Hardware connection | Linux kernel sysfs control | ||||
|---|---|---|---|---|---|
| PWM | gpio | 40-pin num. | pwmchip | pwm_pins | export command /sys/class/pwm/ |
| PWM_A | GPIOX.6 | 33 | pwmchip<num> | 0 | echo 0 > pwmchip<num>/export |
| PWM_B | GPIOX.19 | 35 | pwmchip<num> | 1 | echo 1 > pwmchip<num>/export |
| PWM_C | GPIOX.5 | 7 | pwmchip<num> | 0 | echo 0 > pwmchip<num>/export |
| PWM_D | GPIOX.3 | 11 | pwmchip<num> | 1 | echo 1 > pwmchip<num>/export |
| PWM_E | GPIOX.16 | 12 | pwmchip<num> | 0 | echo 0 > pwmchip<num>/export |
| PWM_F | GPIOX.7 | 15 | pwmchip<num> | 1 | echo 1 > pwmchip<num>/export |
pwmchip#NUM can be found in /sys/class/pwm/
- target
root@odroid:~$ cd /sys/class/pwm/ root@odroid:/sys/class/pwm# ls pwmchip0 pwmchip4 pwmchip8 root@odroid:/sys/class/pwm#
ODROID-M1
The pwm chip number is based on the below table.
The top index show your dtbo selection.
The top index show your dtbo selection.
| PWM_1 Only | PWM_2 Only | PWM_9 Only | PWM_1 & 2 | PWM_1 & 9 | PWM_2 & 9 | PWM_1 & 2 & 9 | |
|---|---|---|---|---|---|---|---|
| PWM_1 | pwmchip0 | X | X | pwmchip0 | pwmchip0 | X | pwmchip0 |
| PWM_2 | X | pwmchip0 | X | pwmchip1 | X | pwmchip0 | pwmchip1 |
| PWM_9 | X | X | pwmchip2 | X | pwmchip3 | pwmchip3 | pwmchip4 |
| Hardware connection | Linux kernel sysfs control | ||||
|---|---|---|---|---|---|
| PWM | gpio | 40-pin num. | pwmchip | pwm_pins | export command /sys/class/pwm/ |
| PWM_1 | GPIO0B.5 | 33 | pwmchip<num> | 0 | echo 0 > pwmchip<num>/export |
| PWM_2 | GPIO0B.6 | 7 | pwmchip<num> | 0 | echo 0 > pwmchip<num>/export |
| PWM_9 | GPIO3B.2 | 15 | pwmchip<num> | 0 | echo 0 > pwmchip<num>/export |
pwmchip#NUM can be found in /sys/class/pwm/
- target
root@odroid:~$ cd /sys/class/pwm/ root@odroid:/sys/class/pwm# ls pwmchip0 pwmchip1 pwmchip2 pwmchip3 pwmchip4 root@odroid:/sys/class/pwm#
Driver usage
The Example tested on the ODROID-N2.
You can control this pwm via simple sysfs entries.
This example uses pin number 12 which is connected to the GPIO_16(GPIOX_16).
Output PWM_E to GPIOX_16 pin.
Various SYSFS Attributes
- Request the device
- target
root@odroid:~$ cd /sys/class/pwm/ root@odroid:/sys/class/pwm# echo 0 > pwmchip4/export root@odroid:/sys/class/pwm# cd pwmchip4 root@odroid:/sys/class/pwm/pwmchip4# ls device export npwm power pwm0 subsystem uevent unexport root@odroid:/sys/class/pwm/pwmchip4#
- Free the device
- target
root@odroid:~$ cd /sys/class/pwm/ root@odroid:/sys/class/pwm# echo 0 > pwmchip4/unexport root@odroid:/sys/class/pwm# cd pwmchip4/ root@odroid:/sys/class/pwm/pwmchip4# ls device export npwm power subsystem uevent unexport
period
The total period of the PWM signal.
Value is in nanoseconds and is the sum of the active and inactive time of the PWM.
The default is zero. If the period is zero, other sysfs of pwm cannot be changed.
Must change 'period' first.
Example
If the period is 1 ms, enter
- target
root@odroid:/sys/class/pwm/pwmchip4/pwm0# echo 1000000 > period
The period will set to 1 ms and PWM Frequency will be 1 kHz.
enable
Enable/Disable the PWM channel
- Enable the PWM
- target
root@odroid:/sys/class/pwm/pwmchip4/pwm0# echo 1 > enable
- Disable the PWM
- target
root@odroid:/sys/class/pwm/pwmchip4/pwm0# echo 0 > enable
duty_cycle
The active time of the PWM signal.
Value is in nanoseconds and must be less than the period.
- target
root@odroid:/sys/class/pwm/pwmchip4/pwm0# echo 500000 > duty_cycle
Polarity
The polarity of the PWM signal.
Value is the string “normal” or “inversed”.
If the polarity is “normal”, the PWM signal is high during the active time(duty_cycle) and is low during the other time(period - duty_cycle).
Example
- To set polarity to normal
- target
root@odroid:/sys/class/pwm/pwmchip4/pwm0# echo "normal" > polarity
- To set polarity to inversed
- target
root@odroid:/sys/class/pwm/pwmchip4/pwm0# echo "inversed" > polarity
luke.go