The ConnectCore 6
hardware supports up to 7 pulse width modulators (PWM).
Digi Embedded Yocto 2.0
firmware supports only the 3 PWMs implemented in the PMIC (1):
1) CC6 SBC HRM http://ftp1.digi.com/support/documentation/90001418_B.pdf
The PMIC GPIOs which can be used in PWM mode are LGA modules pads:
J1B V12 LGA271 = PMIC_GPIO11 (PWM) to control backlight contrast for LVDS0
J1B V13 LGA272 = PMIC_GPIO15 (PWM) to control backlight contrast for LVDS1
J1B Y10 LGA305 = PMIC_GPIO14 (PWM) to control backlight contrast for MIPI DSI
There is also Digi tested driver support in Yocto for them:
Dialog DA9063 LEDS (CONFIG_LEDS_DA9063)
2) the i.MX6 offers PWM1 to PWM4 HRM: http://ftp1.digi.com/support/documentation/90001394_B.pdf
LGA pad name Multiplexing
H3 GPIO_9 ALT4: PWM1_OUT
J21 SD1_DAT2 ALT3: PWM2_OUT
J22 SD1_DAT1 ALT2: PWM3_OUT
J23 SD1_CMD ALT2: PWM4_OUT
K3 GPIO_1 ALT4: PWM2_OUT
L20 SD1_DAT3 ALT3: PWM1_OUT
AA8 DISP0_DAT8 ALT2: PWM1_OUT
AB6 DISP0_DAT9 ALT2: PWM2_OUT
On the SBC not all of them are availble in hardware.
For the 4 iMX6 PWMs there is a driver in Yocto:
i.MX PWM support (CONFIG_PWM_IMX)
however
the latter one was not tested by Digi (might not work out of the box).
Last updated:
Jun 21, 2019