How do I configure the Beaglebone Black PWM correctly
0
I have tried to get PWM working and am not having any success. I am using the TI Processor SDK with a modified version of the am335x-boneblack.dts device tree (see below)
The PWM driver (ehrpwm1) probes correctly and appears in /sys/class/pwm/pwmchip0. Then, I configured the chip
cd /sys/class/pwm/pwmchip0
echo 0 > export
echo 1000000 > pwm0/period
echo 250000 > pwm0/duty_cycle
echo 1 > pwm0/enable
However, there is no PWM output. Am I missing something obvious?
Here is the device tree I have made:
/dts-v1/;
#include "am33xx.dtsi"
#include "am335x-bone-common.dtsi"
/ {
model = "TI AM335x BeagleBone Black";
compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx";
};
&ldo3_reg {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
};
&mmc1 {
vmmc-supply = <&vmmcsd_fixed>;
};
&mmc2 {
vmmc-supply = <&vmmcsd_fixed>;
pinctrl-names = "default";
pinctrl-0 = <&emmc_pins>;
bus-width = <8>;
status = "okay";
};
&am33xx_pinmux {
lcd_pins: lcd_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8a0, PIN_OUTPUT | MUX_MODE0) /* P9.45, lcd_data0 */
AM33XX_IOPAD(0x8a4, PIN_OUTPUT | MUX_MODE0) /* P9.46, lcd_data1 */
AM33XX_IOPAD(0x8a8, PIN_OUTPUT | MUX_MODE0) /* P9.43, lcd_data2 */
AM33XX_IOPAD(0x8ac, PIN_OUTPUT | MUX_MODE0) /* P9.44, lcd_data3 */
AM33XX_IOPAD(0x8b0, PIN_OUTPUT | MUX_MODE0) /* P9.41, lcd_data4 */
AM33XX_IOPAD(0x8b4, PIN_OUTPUT | MUX_MODE0) /* P9.42, lcd_data5 */
AM33XX_IOPAD(0x8b8, PIN_OUTPUT | MUX_MODE0) /* P9.39, lcd_data6 */
AM33XX_IOPAD(0x8bc, PIN_OUTPUT | MUX_MODE0) /* P9.40, lcd_data7 */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT | MUX_MODE0) /* P9.37, lcd_data8 */
AM33XX_IOPAD(0x8c4, PIN_OUTPUT | MUX_MODE0) /* P9.38, lcd_data9 */
AM33XX_IOPAD(0x8c8, PIN_OUTPUT | MUX_MODE0) /* P9.36, lcd_data10 */
AM33XX_IOPAD(0x8cc, PIN_OUTPUT | MUX_MODE0) /* P9.34, lcd_data11 */
AM33XX_IOPAD(0x8d0, PIN_OUTPUT | MUX_MODE0) /* P9.35, lcd_data12 */
AM33XX_IOPAD(0x8d4, PIN_OUTPUT | MUX_MODE0) /* P9.33, lcd_data13 */
AM33XX_IOPAD(0x8d8, PIN_OUTPUT | MUX_MODE0) /* P9.31, lcd_data14 */
AM33XX_IOPAD(0x8dc, PIN_OUTPUT | MUX_MODE0) /* P9.32, lcd_data15 */
AM33XX_IOPAD(0x820, PIN_OUTPUT | MUX_MODE1) /* P9.19, lcd_data23 */
AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE1) /* P9.13, lcd_data22 */
AM33XX_IOPAD(0x828, PIN_OUTPUT | MUX_MODE1) /* P9.14, lcd_data21 */
AM33XX_IOPAD(0x82c, PIN_OUTPUT | MUX_MODE1) /* P9.17, lcd_data20 */
AM33XX_IOPAD(0x830, PIN_OUTPUT | MUX_MODE1) /* P9.12, lcd_data19 */
AM33XX_IOPAD(0x834, PIN_OUTPUT | MUX_MODE1) /* P9.11, lcd_data18 */
AM33XX_IOPAD(0x838, PIN_OUTPUT | MUX_MODE1) /* P9.16, lcd_data17 */
AM33XX_IOPAD(0x83c, PIN_OUTPUT | MUX_MODE1) /* P9.15, lcd_data16 */
AM33XX_IOPAD(0x8e0, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.27, lcd_vsync */
AM33XX_IOPAD(0x8e4, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.29, lcd_hsync */
AM33XX_IOPAD(0x8e8, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.28, lcd_pclk */
AM33XX_IOPAD(0x8ec, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.30, lcd_ac_bias_en */
/* LCD enable */
AM33XX_IOPAD(0x88c, PIN_OUTPUT_PULLUP | MUX_MODE7) /* P8.19, gpio2[1] */
>;
};
backlight_pin: backlight_pin {
pinctrl-single,pins = < AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE6) >; /* P9.14, gpio1[18] */
};
touchscreen_pins: touchscreen_pins {
pinctrl-single,pins = < AM33XX_IOPAD(0x9a4, PIN_INPUT_PULLUP | MUX_MODE7) >; /* P9.27, gpio3[19] */
};
dcan0_pins: dcan0_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x97c, PIN_INPUT_PULLUP | MUX_MODE2) /* P9.19, ddcan0_rx */
AM33XX_IOPAD(0x978, PIN_OUTPUT_PULLUP | MUX_MODE2) /* P9.20, ddcan0_tx */
>;
};
uart1_pins: uart1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x980, PIN_INPUT_PULLUP | MUX_MODE0) /* P9.26, uart1_rxd */
AM33XX_IOPAD(0x984, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.24, uart1_txd */
>;
};
uart2_pins: uart2_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x950, PIN_INPUT_PULLUP | MUX_MODE1) /* P9.22, uart2_rxd */
AM33XX_IOPAD(0x954, PIN_OUTPUT_PULLDOWN | MUX_MODE1) /* P9.21, uart2_txd */
>;
};
uart4_pins: uart4_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x870, PIN_INPUT_PULLUP | MUX_MODE6) /* P9.11, uart4_rxd */
AM33XX_IOPAD(0x874, PIN_OUTPUT_PULLDOWN | MUX_MODE6) /* P9.13, uart4_txd */
>;
};
uart5_pins: uart5_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8c4, PIN_INPUT_PULLUP | MUX_MODE4) /* P8.38, uart5_rxd */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT_PULLDOWN | MUX_MODE4) /* P8.37, uart5_txd */
>;
};
ehrpwm1_pins: ehrpwm1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE6) /* P9.14, EHRPWM1A */
AM33XX_IOPAD(0x84c, PIN_OUTPUT | MUX_MODE6) /* P9.16, EHRPWM1B */
>;
};
};
&epwmss1 {
status = "okay";
};
&ehrpwm1 {
pinctrl-name = "default";
pinctrl-0 = <&backlight_pin>;
status = "okay";
};
&lcdc {
status = "okay";
blue-and-red-wiring = "crossed";
};
&sgx {
status = "okay";
};
/ {
lcd0: display {
status = "okay";
compatible = "ti,tilcdc,panel";
label = "lcd";
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins>;
enable-gpios = <&gpio2 1 GPIO_ACTIVE_HIGH>; /* P8.19 */
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <32>;
fdd = <0x80>;
sync-edge = <0>;
sync-ctrl = <0>;
raster-order = <0>;
fifo-th = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 800x480 {
clock-frequency = <45000000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <40>;
hback-porch = <40>;
hsync-len = <48>;
vback-porch = <29>;
vfront-porch = <13>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
};
};
};
};
&i2c2 {
polytouch: edt-ft5x06@38 {
compatible = "edt,edt-ft5406", "edt,edt-ft5x06";
reg = <0x38>;
pinctrl-names = "default";
pinctrl-0 = <&touchscreen_pins>;
interrupt-parent = <&gpio3>;
interrupts = <19 0>; /* P9.27 */
touchscreen-size-x = <799>;
touchscreen-size-y = <479>;
xfuzz = <0>;
yfuzz = <0>;
};
};
&rtc {
system-power-controller;
};
&dcan0 {
status = "okay";
pinctrl-name = "default";
pinctrl-0 = <&dcan0_pins>;
};
&uart1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart1_pins>;
};
&uart2 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart2_pins>;
};
&uart4 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart4_pins>;
};
linux linux-kernel beagleboneblack device-tree
asked 30 mins ago
user8908459user8908459
1011
New contributor
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
0
I have tried to get PWM working and am not having any success. I am using the TI Processor SDK with a modified version of the am335x-boneblack.dts device tree (see below)
The PWM driver (ehrpwm1) probes correctly and appears in /sys/class/pwm/pwmchip0. Then, I configured the chip
cd /sys/class/pwm/pwmchip0
echo 0 > export
echo 1000000 > pwm0/period
echo 250000 > pwm0/duty_cycle
echo 1 > pwm0/enable
However, there is no PWM output. Am I missing something obvious?
Here is the device tree I have made:
/dts-v1/;
#include "am33xx.dtsi"
#include "am335x-bone-common.dtsi"
/ {
model = "TI AM335x BeagleBone Black";
compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx";
};
&ldo3_reg {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
};
&mmc1 {
vmmc-supply = <&vmmcsd_fixed>;
};
&mmc2 {
vmmc-supply = <&vmmcsd_fixed>;
pinctrl-names = "default";
pinctrl-0 = <&emmc_pins>;
bus-width = <8>;
status = "okay";
};
&am33xx_pinmux {
lcd_pins: lcd_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8a0, PIN_OUTPUT | MUX_MODE0) /* P9.45, lcd_data0 */
AM33XX_IOPAD(0x8a4, PIN_OUTPUT | MUX_MODE0) /* P9.46, lcd_data1 */
AM33XX_IOPAD(0x8a8, PIN_OUTPUT | MUX_MODE0) /* P9.43, lcd_data2 */
AM33XX_IOPAD(0x8ac, PIN_OUTPUT | MUX_MODE0) /* P9.44, lcd_data3 */
AM33XX_IOPAD(0x8b0, PIN_OUTPUT | MUX_MODE0) /* P9.41, lcd_data4 */
AM33XX_IOPAD(0x8b4, PIN_OUTPUT | MUX_MODE0) /* P9.42, lcd_data5 */
AM33XX_IOPAD(0x8b8, PIN_OUTPUT | MUX_MODE0) /* P9.39, lcd_data6 */
AM33XX_IOPAD(0x8bc, PIN_OUTPUT | MUX_MODE0) /* P9.40, lcd_data7 */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT | MUX_MODE0) /* P9.37, lcd_data8 */
AM33XX_IOPAD(0x8c4, PIN_OUTPUT | MUX_MODE0) /* P9.38, lcd_data9 */
AM33XX_IOPAD(0x8c8, PIN_OUTPUT | MUX_MODE0) /* P9.36, lcd_data10 */
AM33XX_IOPAD(0x8cc, PIN_OUTPUT | MUX_MODE0) /* P9.34, lcd_data11 */
AM33XX_IOPAD(0x8d0, PIN_OUTPUT | MUX_MODE0) /* P9.35, lcd_data12 */
AM33XX_IOPAD(0x8d4, PIN_OUTPUT | MUX_MODE0) /* P9.33, lcd_data13 */
AM33XX_IOPAD(0x8d8, PIN_OUTPUT | MUX_MODE0) /* P9.31, lcd_data14 */
AM33XX_IOPAD(0x8dc, PIN_OUTPUT | MUX_MODE0) /* P9.32, lcd_data15 */
AM33XX_IOPAD(0x820, PIN_OUTPUT | MUX_MODE1) /* P9.19, lcd_data23 */
AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE1) /* P9.13, lcd_data22 */
AM33XX_IOPAD(0x828, PIN_OUTPUT | MUX_MODE1) /* P9.14, lcd_data21 */
AM33XX_IOPAD(0x82c, PIN_OUTPUT | MUX_MODE1) /* P9.17, lcd_data20 */
AM33XX_IOPAD(0x830, PIN_OUTPUT | MUX_MODE1) /* P9.12, lcd_data19 */
AM33XX_IOPAD(0x834, PIN_OUTPUT | MUX_MODE1) /* P9.11, lcd_data18 */
AM33XX_IOPAD(0x838, PIN_OUTPUT | MUX_MODE1) /* P9.16, lcd_data17 */
AM33XX_IOPAD(0x83c, PIN_OUTPUT | MUX_MODE1) /* P9.15, lcd_data16 */
AM33XX_IOPAD(0x8e0, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.27, lcd_vsync */
AM33XX_IOPAD(0x8e4, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.29, lcd_hsync */
AM33XX_IOPAD(0x8e8, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.28, lcd_pclk */
AM33XX_IOPAD(0x8ec, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.30, lcd_ac_bias_en */
/* LCD enable */
AM33XX_IOPAD(0x88c, PIN_OUTPUT_PULLUP | MUX_MODE7) /* P8.19, gpio2[1] */
>;
};
backlight_pin: backlight_pin {
pinctrl-single,pins = < AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE6) >; /* P9.14, gpio1[18] */
};
touchscreen_pins: touchscreen_pins {
pinctrl-single,pins = < AM33XX_IOPAD(0x9a4, PIN_INPUT_PULLUP | MUX_MODE7) >; /* P9.27, gpio3[19] */
};
dcan0_pins: dcan0_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x97c, PIN_INPUT_PULLUP | MUX_MODE2) /* P9.19, ddcan0_rx */
AM33XX_IOPAD(0x978, PIN_OUTPUT_PULLUP | MUX_MODE2) /* P9.20, ddcan0_tx */
>;
};
uart1_pins: uart1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x980, PIN_INPUT_PULLUP | MUX_MODE0) /* P9.26, uart1_rxd */
AM33XX_IOPAD(0x984, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.24, uart1_txd */
>;
};
uart2_pins: uart2_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x950, PIN_INPUT_PULLUP | MUX_MODE1) /* P9.22, uart2_rxd */
AM33XX_IOPAD(0x954, PIN_OUTPUT_PULLDOWN | MUX_MODE1) /* P9.21, uart2_txd */
>;
};
uart4_pins: uart4_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x870, PIN_INPUT_PULLUP | MUX_MODE6) /* P9.11, uart4_rxd */
AM33XX_IOPAD(0x874, PIN_OUTPUT_PULLDOWN | MUX_MODE6) /* P9.13, uart4_txd */
>;
};
uart5_pins: uart5_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8c4, PIN_INPUT_PULLUP | MUX_MODE4) /* P8.38, uart5_rxd */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT_PULLDOWN | MUX_MODE4) /* P8.37, uart5_txd */
>;
};
ehrpwm1_pins: ehrpwm1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE6) /* P9.14, EHRPWM1A */
AM33XX_IOPAD(0x84c, PIN_OUTPUT | MUX_MODE6) /* P9.16, EHRPWM1B */
>;
};
};
&epwmss1 {
status = "okay";
};
&ehrpwm1 {
pinctrl-name = "default";
pinctrl-0 = <&backlight_pin>;
status = "okay";
};
&lcdc {
status = "okay";
blue-and-red-wiring = "crossed";
};
&sgx {
status = "okay";
};
/ {
lcd0: display {
status = "okay";
compatible = "ti,tilcdc,panel";
label = "lcd";
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins>;
enable-gpios = <&gpio2 1 GPIO_ACTIVE_HIGH>; /* P8.19 */
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <32>;
fdd = <0x80>;
sync-edge = <0>;
sync-ctrl = <0>;
raster-order = <0>;
fifo-th = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 800x480 {
clock-frequency = <45000000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <40>;
hback-porch = <40>;
hsync-len = <48>;
vback-porch = <29>;
vfront-porch = <13>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
};
};
};
};
&i2c2 {
polytouch: edt-ft5x06@38 {
compatible = "edt,edt-ft5406", "edt,edt-ft5x06";
reg = <0x38>;
pinctrl-names = "default";
pinctrl-0 = <&touchscreen_pins>;
interrupt-parent = <&gpio3>;
interrupts = <19 0>; /* P9.27 */
touchscreen-size-x = <799>;
touchscreen-size-y = <479>;
xfuzz = <0>;
yfuzz = <0>;
};
};
&rtc {
system-power-controller;
};
&dcan0 {
status = "okay";
pinctrl-name = "default";
pinctrl-0 = <&dcan0_pins>;
};
&uart1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart1_pins>;
};
&uart2 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart2_pins>;
};
&uart4 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart4_pins>;
};
linux linux-kernel beagleboneblack device-tree
asked 30 mins ago
user8908459user8908459
1011
New contributor
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
0
0
0
I have tried to get PWM working and am not having any success. I am using the TI Processor SDK with a modified version of the am335x-boneblack.dts device tree (see below)
The PWM driver (ehrpwm1) probes correctly and appears in /sys/class/pwm/pwmchip0. Then, I configured the chip
cd /sys/class/pwm/pwmchip0
echo 0 > export
echo 1000000 > pwm0/period
echo 250000 > pwm0/duty_cycle
echo 1 > pwm0/enable
However, there is no PWM output. Am I missing something obvious?
Here is the device tree I have made:
/dts-v1/;
#include "am33xx.dtsi"
#include "am335x-bone-common.dtsi"
/ {
model = "TI AM335x BeagleBone Black";
compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx";
};
&ldo3_reg {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
};
&mmc1 {
vmmc-supply = <&vmmcsd_fixed>;
};
&mmc2 {
vmmc-supply = <&vmmcsd_fixed>;
pinctrl-names = "default";
pinctrl-0 = <&emmc_pins>;
bus-width = <8>;
status = "okay";
};
&am33xx_pinmux {
lcd_pins: lcd_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8a0, PIN_OUTPUT | MUX_MODE0) /* P9.45, lcd_data0 */
AM33XX_IOPAD(0x8a4, PIN_OUTPUT | MUX_MODE0) /* P9.46, lcd_data1 */
AM33XX_IOPAD(0x8a8, PIN_OUTPUT | MUX_MODE0) /* P9.43, lcd_data2 */
AM33XX_IOPAD(0x8ac, PIN_OUTPUT | MUX_MODE0) /* P9.44, lcd_data3 */
AM33XX_IOPAD(0x8b0, PIN_OUTPUT | MUX_MODE0) /* P9.41, lcd_data4 */
AM33XX_IOPAD(0x8b4, PIN_OUTPUT | MUX_MODE0) /* P9.42, lcd_data5 */
AM33XX_IOPAD(0x8b8, PIN_OUTPUT | MUX_MODE0) /* P9.39, lcd_data6 */
AM33XX_IOPAD(0x8bc, PIN_OUTPUT | MUX_MODE0) /* P9.40, lcd_data7 */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT | MUX_MODE0) /* P9.37, lcd_data8 */
AM33XX_IOPAD(0x8c4, PIN_OUTPUT | MUX_MODE0) /* P9.38, lcd_data9 */
AM33XX_IOPAD(0x8c8, PIN_OUTPUT | MUX_MODE0) /* P9.36, lcd_data10 */
AM33XX_IOPAD(0x8cc, PIN_OUTPUT | MUX_MODE0) /* P9.34, lcd_data11 */
AM33XX_IOPAD(0x8d0, PIN_OUTPUT | MUX_MODE0) /* P9.35, lcd_data12 */
AM33XX_IOPAD(0x8d4, PIN_OUTPUT | MUX_MODE0) /* P9.33, lcd_data13 */
AM33XX_IOPAD(0x8d8, PIN_OUTPUT | MUX_MODE0) /* P9.31, lcd_data14 */
AM33XX_IOPAD(0x8dc, PIN_OUTPUT | MUX_MODE0) /* P9.32, lcd_data15 */
AM33XX_IOPAD(0x820, PIN_OUTPUT | MUX_MODE1) /* P9.19, lcd_data23 */
AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE1) /* P9.13, lcd_data22 */
AM33XX_IOPAD(0x828, PIN_OUTPUT | MUX_MODE1) /* P9.14, lcd_data21 */
AM33XX_IOPAD(0x82c, PIN_OUTPUT | MUX_MODE1) /* P9.17, lcd_data20 */
AM33XX_IOPAD(0x830, PIN_OUTPUT | MUX_MODE1) /* P9.12, lcd_data19 */
AM33XX_IOPAD(0x834, PIN_OUTPUT | MUX_MODE1) /* P9.11, lcd_data18 */
AM33XX_IOPAD(0x838, PIN_OUTPUT | MUX_MODE1) /* P9.16, lcd_data17 */
AM33XX_IOPAD(0x83c, PIN_OUTPUT | MUX_MODE1) /* P9.15, lcd_data16 */
AM33XX_IOPAD(0x8e0, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.27, lcd_vsync */
AM33XX_IOPAD(0x8e4, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.29, lcd_hsync */
AM33XX_IOPAD(0x8e8, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.28, lcd_pclk */
AM33XX_IOPAD(0x8ec, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.30, lcd_ac_bias_en */
/* LCD enable */
AM33XX_IOPAD(0x88c, PIN_OUTPUT_PULLUP | MUX_MODE7) /* P8.19, gpio2[1] */
>;
};
backlight_pin: backlight_pin {
pinctrl-single,pins = < AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE6) >; /* P9.14, gpio1[18] */
};
touchscreen_pins: touchscreen_pins {
pinctrl-single,pins = < AM33XX_IOPAD(0x9a4, PIN_INPUT_PULLUP | MUX_MODE7) >; /* P9.27, gpio3[19] */
};
dcan0_pins: dcan0_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x97c, PIN_INPUT_PULLUP | MUX_MODE2) /* P9.19, ddcan0_rx */
AM33XX_IOPAD(0x978, PIN_OUTPUT_PULLUP | MUX_MODE2) /* P9.20, ddcan0_tx */
>;
};
uart1_pins: uart1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x980, PIN_INPUT_PULLUP | MUX_MODE0) /* P9.26, uart1_rxd */
AM33XX_IOPAD(0x984, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.24, uart1_txd */
>;
};
uart2_pins: uart2_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x950, PIN_INPUT_PULLUP | MUX_MODE1) /* P9.22, uart2_rxd */
AM33XX_IOPAD(0x954, PIN_OUTPUT_PULLDOWN | MUX_MODE1) /* P9.21, uart2_txd */
>;
};
uart4_pins: uart4_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x870, PIN_INPUT_PULLUP | MUX_MODE6) /* P9.11, uart4_rxd */
AM33XX_IOPAD(0x874, PIN_OUTPUT_PULLDOWN | MUX_MODE6) /* P9.13, uart4_txd */
>;
};
uart5_pins: uart5_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8c4, PIN_INPUT_PULLUP | MUX_MODE4) /* P8.38, uart5_rxd */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT_PULLDOWN | MUX_MODE4) /* P8.37, uart5_txd */
>;
};
ehrpwm1_pins: ehrpwm1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE6) /* P9.14, EHRPWM1A */
AM33XX_IOPAD(0x84c, PIN_OUTPUT | MUX_MODE6) /* P9.16, EHRPWM1B */
>;
};
};
&epwmss1 {
status = "okay";
};
&ehrpwm1 {
pinctrl-name = "default";
pinctrl-0 = <&backlight_pin>;
status = "okay";
};
&lcdc {
status = "okay";
blue-and-red-wiring = "crossed";
};
&sgx {
status = "okay";
};
/ {
lcd0: display {
status = "okay";
compatible = "ti,tilcdc,panel";
label = "lcd";
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins>;
enable-gpios = <&gpio2 1 GPIO_ACTIVE_HIGH>; /* P8.19 */
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <32>;
fdd = <0x80>;
sync-edge = <0>;
sync-ctrl = <0>;
raster-order = <0>;
fifo-th = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 800x480 {
clock-frequency = <45000000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <40>;
hback-porch = <40>;
hsync-len = <48>;
vback-porch = <29>;
vfront-porch = <13>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
};
};
};
};
&i2c2 {
polytouch: edt-ft5x06@38 {
compatible = "edt,edt-ft5406", "edt,edt-ft5x06";
reg = <0x38>;
pinctrl-names = "default";
pinctrl-0 = <&touchscreen_pins>;
interrupt-parent = <&gpio3>;
interrupts = <19 0>; /* P9.27 */
touchscreen-size-x = <799>;
touchscreen-size-y = <479>;
xfuzz = <0>;
yfuzz = <0>;
};
};
&rtc {
system-power-controller;
};
&dcan0 {
status = "okay";
pinctrl-name = "default";
pinctrl-0 = <&dcan0_pins>;
};
&uart1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart1_pins>;
};
&uart2 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart2_pins>;
};
&uart4 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart4_pins>;
};
linux linux-kernel beagleboneblack device-tree
asked 30 mins ago
user8908459user8908459
1011
New contributor
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have tried to get PWM working and am not having any success. I am using the TI Processor SDK with a modified version of the am335x-boneblack.dts device tree (see below)
The PWM driver (ehrpwm1) probes correctly and appears in /sys/class/pwm/pwmchip0. Then, I configured the chip
cd /sys/class/pwm/pwmchip0
echo 0 > export
echo 1000000 > pwm0/period
echo 250000 > pwm0/duty_cycle
echo 1 > pwm0/enable
However, there is no PWM output. Am I missing something obvious?
Here is the device tree I have made:
/dts-v1/;
#include "am33xx.dtsi"
#include "am335x-bone-common.dtsi"
/ {
model = "TI AM335x BeagleBone Black";
compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx";
};
&ldo3_reg {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
};
&mmc1 {
vmmc-supply = <&vmmcsd_fixed>;
};
&mmc2 {
vmmc-supply = <&vmmcsd_fixed>;
pinctrl-names = "default";
pinctrl-0 = <&emmc_pins>;
bus-width = <8>;
status = "okay";
};
&am33xx_pinmux {
lcd_pins: lcd_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8a0, PIN_OUTPUT | MUX_MODE0) /* P9.45, lcd_data0 */
AM33XX_IOPAD(0x8a4, PIN_OUTPUT | MUX_MODE0) /* P9.46, lcd_data1 */
AM33XX_IOPAD(0x8a8, PIN_OUTPUT | MUX_MODE0) /* P9.43, lcd_data2 */
AM33XX_IOPAD(0x8ac, PIN_OUTPUT | MUX_MODE0) /* P9.44, lcd_data3 */
AM33XX_IOPAD(0x8b0, PIN_OUTPUT | MUX_MODE0) /* P9.41, lcd_data4 */
AM33XX_IOPAD(0x8b4, PIN_OUTPUT | MUX_MODE0) /* P9.42, lcd_data5 */
AM33XX_IOPAD(0x8b8, PIN_OUTPUT | MUX_MODE0) /* P9.39, lcd_data6 */
AM33XX_IOPAD(0x8bc, PIN_OUTPUT | MUX_MODE0) /* P9.40, lcd_data7 */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT | MUX_MODE0) /* P9.37, lcd_data8 */
AM33XX_IOPAD(0x8c4, PIN_OUTPUT | MUX_MODE0) /* P9.38, lcd_data9 */
AM33XX_IOPAD(0x8c8, PIN_OUTPUT | MUX_MODE0) /* P9.36, lcd_data10 */
AM33XX_IOPAD(0x8cc, PIN_OUTPUT | MUX_MODE0) /* P9.34, lcd_data11 */
AM33XX_IOPAD(0x8d0, PIN_OUTPUT | MUX_MODE0) /* P9.35, lcd_data12 */
AM33XX_IOPAD(0x8d4, PIN_OUTPUT | MUX_MODE0) /* P9.33, lcd_data13 */
AM33XX_IOPAD(0x8d8, PIN_OUTPUT | MUX_MODE0) /* P9.31, lcd_data14 */
AM33XX_IOPAD(0x8dc, PIN_OUTPUT | MUX_MODE0) /* P9.32, lcd_data15 */
AM33XX_IOPAD(0x820, PIN_OUTPUT | MUX_MODE1) /* P9.19, lcd_data23 */
AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE1) /* P9.13, lcd_data22 */
AM33XX_IOPAD(0x828, PIN_OUTPUT | MUX_MODE1) /* P9.14, lcd_data21 */
AM33XX_IOPAD(0x82c, PIN_OUTPUT | MUX_MODE1) /* P9.17, lcd_data20 */
AM33XX_IOPAD(0x830, PIN_OUTPUT | MUX_MODE1) /* P9.12, lcd_data19 */
AM33XX_IOPAD(0x834, PIN_OUTPUT | MUX_MODE1) /* P9.11, lcd_data18 */
AM33XX_IOPAD(0x838, PIN_OUTPUT | MUX_MODE1) /* P9.16, lcd_data17 */
AM33XX_IOPAD(0x83c, PIN_OUTPUT | MUX_MODE1) /* P9.15, lcd_data16 */
AM33XX_IOPAD(0x8e0, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.27, lcd_vsync */
AM33XX_IOPAD(0x8e4, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.29, lcd_hsync */
AM33XX_IOPAD(0x8e8, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.28, lcd_pclk */
AM33XX_IOPAD(0x8ec, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.30, lcd_ac_bias_en */
/* LCD enable */
AM33XX_IOPAD(0x88c, PIN_OUTPUT_PULLUP | MUX_MODE7) /* P8.19, gpio2[1] */
>;
};
backlight_pin: backlight_pin {
pinctrl-single,pins = < AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE6) >; /* P9.14, gpio1[18] */
};
touchscreen_pins: touchscreen_pins {
pinctrl-single,pins = < AM33XX_IOPAD(0x9a4, PIN_INPUT_PULLUP | MUX_MODE7) >; /* P9.27, gpio3[19] */
};
dcan0_pins: dcan0_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x97c, PIN_INPUT_PULLUP | MUX_MODE2) /* P9.19, ddcan0_rx */
AM33XX_IOPAD(0x978, PIN_OUTPUT_PULLUP | MUX_MODE2) /* P9.20, ddcan0_tx */
>;
};
uart1_pins: uart1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x980, PIN_INPUT_PULLUP | MUX_MODE0) /* P9.26, uart1_rxd */
AM33XX_IOPAD(0x984, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* P9.24, uart1_txd */
>;
};
uart2_pins: uart2_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x950, PIN_INPUT_PULLUP | MUX_MODE1) /* P9.22, uart2_rxd */
AM33XX_IOPAD(0x954, PIN_OUTPUT_PULLDOWN | MUX_MODE1) /* P9.21, uart2_txd */
>;
};
uart4_pins: uart4_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x870, PIN_INPUT_PULLUP | MUX_MODE6) /* P9.11, uart4_rxd */
AM33XX_IOPAD(0x874, PIN_OUTPUT_PULLDOWN | MUX_MODE6) /* P9.13, uart4_txd */
>;
};
uart5_pins: uart5_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8c4, PIN_INPUT_PULLUP | MUX_MODE4) /* P8.38, uart5_rxd */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT_PULLDOWN | MUX_MODE4) /* P8.37, uart5_txd */
>;
};
ehrpwm1_pins: ehrpwm1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x848, PIN_OUTPUT | MUX_MODE6) /* P9.14, EHRPWM1A */
AM33XX_IOPAD(0x84c, PIN_OUTPUT | MUX_MODE6) /* P9.16, EHRPWM1B */
>;
};
};
&epwmss1 {
status = "okay";
};
&ehrpwm1 {
pinctrl-name = "default";
pinctrl-0 = <&backlight_pin>;
status = "okay";
};
&lcdc {
status = "okay";
blue-and-red-wiring = "crossed";
};
&sgx {
status = "okay";
};
/ {
lcd0: display {
status = "okay";
compatible = "ti,tilcdc,panel";
label = "lcd";
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins>;
enable-gpios = <&gpio2 1 GPIO_ACTIVE_HIGH>; /* P8.19 */
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <32>;
fdd = <0x80>;
sync-edge = <0>;
sync-ctrl = <0>;
raster-order = <0>;
fifo-th = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 800x480 {
clock-frequency = <45000000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <40>;
hback-porch = <40>;
hsync-len = <48>;
vback-porch = <29>;
vfront-porch = <13>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
};
};
};
};
&i2c2 {
polytouch: edt-ft5x06@38 {
compatible = "edt,edt-ft5406", "edt,edt-ft5x06";
reg = <0x38>;
pinctrl-names = "default";
pinctrl-0 = <&touchscreen_pins>;
interrupt-parent = <&gpio3>;
interrupts = <19 0>; /* P9.27 */
touchscreen-size-x = <799>;
touchscreen-size-y = <479>;
xfuzz = <0>;
yfuzz = <0>;
};
};
&rtc {
system-power-controller;
};
&dcan0 {
status = "okay";
pinctrl-name = "default";
pinctrl-0 = <&dcan0_pins>;
};
&uart1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart1_pins>;
};
&uart2 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart2_pins>;
};
&uart4 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart4_pins>;
};
linux linux-kernel beagleboneblack device-tree
linux linux-kernel beagleboneblack device-tree
asked 30 mins ago
user8908459user8908459
1011
New contributor
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 30 mins ago
user8908459user8908459
1011
New contributor
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 30 mins ago
user8908459user8908459
1011
New contributor
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 30 mins ago
user8908459user8908459
1011
asked 30 mins ago
user8908459user8908459
1011
1011
New contributor
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
user8908459 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
user8908459 is a new contributor. Be nice, and check out our Code of Conduct.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f502196%2fhow-do-i-configure-the-beaglebone-black-pwm-correctly%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
user8908459 is a new contributor. Be nice, and check out our Code of Conduct.
draft saved
draft discarded
user8908459 is a new contributor. Be nice, and check out our Code of Conduct.
user8908459 is a new contributor. Be nice, and check out our Code of Conduct.
user8908459 is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f502196%2fhow-do-i-configure-the-beaglebone-black-pwm-correctly%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
