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boards: arm: gd32f403z_eval: enable pwm support

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Enable timer0 and its pwm node. The board does not directly have any LED
connected to a PWM output. However, following the official
"TIMER_Breath_LED" example, user can bridge PA8 (TIMER0_CH0) to PF0
(LED2) to run quick samples such as samples/basic/blinky_pwm.

Note that a prescaler value of 256 has been chosen so that basic PWM
samples (blinky_pwm and fade_led) can be run. This value may be
overriden in specific samples if needed.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
This commit is contained in:
Gerard Marull-Paretas 2021-12-14 23:17:43 +01:00 • committed by Maureen Helm
commit 0ec7af9c17
4 changed files with 31 additions and 0 deletions
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2
boards/arm/gd32f403z_eval/doc/index.rst
View file

@ -66,6 +66,8 @@ The board configuration supports the following hardware features:
| NVIC | on-chip | nested vectored | | NVIC | on-chip | nested vectored |
| | | interrupt controller | | | | interrupt controller |
+-----------+------------+-----------------------+ +-----------+------------+-----------------------+
| PWM | on-chip | PWM |
+-----------+------------+-----------------------+
| SYSTICK | on-chip | system clock | | SYSTICK | on-chip | system clock |
+-----------+------------+-----------------------+ +-----------+------------+-----------------------+
| UART | on-chip | serial port-polling | | UART | on-chip | serial port-polling |

6
boards/arm/gd32f403z_eval/gd32f403z_eval-pinctrl.dtsi
View file

@ -11,4 +11,10 @@
pinmux = <USART0_TX_PA9_NORMP>, <USART0_RX_PA10_NORMP>; pinmux = <USART0_TX_PA9_NORMP>, <USART0_RX_PA10_NORMP>;
}; };
}; };
pwm0_default: pwm0_default {
group1 {
pinmux = <TIMER0_CH0_PA8_OUT_NORMP>;
};
};
}; };

21
boards/arm/gd32f403z_eval/gd32f403z_eval.dts
View file

@ -59,10 +59,20 @@
}; };
}; };
pwmleds {
compatible = "pwm-leds";
/* NOTE: bridge TIMER0_CH0 (PA8) and LED2 (PF0) */
pwm_led: pwm_led {
pwms = <&pwm0 0 PWM_POLARITY_NORMAL>;
};
};
aliases { aliases {
led0 = &led2; led0 = &led2;
led1 = &led3; led1 = &led3;
sw0 = &user_key1; sw0 = &user_key1;
pwm-led0 = &pwm_led;
}; };
}; };
@ -84,3 +94,14 @@
pinctrl-0 = <&usart0_default>; pinctrl-0 = <&usart0_default>;
pinctrl-names = "default"; pinctrl-names = "default";
}; };
&timer0 {
status = "okay";
prescaler = <256>;
pwm0: pwm {
status = "okay";
pinctrl-0 = <&pwm0_default>;
pinctrl-names = "default";
};
};

2
boards/arm/gd32f403z_eval/gd32f403z_eval.yaml
View file

@ -11,3 +11,5 @@ toolchain:
- zephyr - zephyr
- gnuarmemb - gnuarmemb
- xtools - xtools
supported:
- pwm