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器件型号：TDA4VH 工具/软件：
如何在 TDA4 电路板上的 Linux 中启用 ECAP？
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工具/软件：
如何在 TDA4 电路板上的 Linux 中启用 ECAP？
尊敬的 Gokul：
以下步骤将在 TDA4VH 板上启用 eCAP。 类似的更改也可应用于其他 TDA4 板：
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From 156367f0a2ad26d5d56f38ceefeb7c3f9d4fdeed Mon Sep 17 00:00:00 2001
From: Gokul Praveen <g-praveen@ti.com>
Date: Tue, 22 Apr 2025 15:30:48 +0530
Subject: [PATCH] ECAP ENABLE
Enables ECAP in capture mode on J784S4
Similar changes can be made to other boards as well
---
arch/arm64/boot/dts/ti/k3-j784s4-evm.dts | 41 ++++++++++++++++++++++
arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi | 30 ++++++++++++++++
arch/arm64/boot/dts/ti/k3-j784s4.dtsi | 3 ++
3 files changed, 74 insertions(+)
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
index de256005f..61ea53554 100644
--- a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
@@ -500,8 +500,49 @@ audio_ext_refclk1_pins_default: audio-ext-refclk1-default-pins {
J784S4_IOPAD(0x078, PIN_OUTPUT, 1) /* (AH37) MCAN2_RX.AUDIO_EXT_REFCLK1 */
>;
};
+
+ myecap0_pins_default: myecap0-default-pins {
+ pinctrl-single,pins = <
+ J784S4_IOPAD(0x0c4, PIN_INPUT, 0) /* (AD36) ECAP0_IN_APWM_OUT */
+ >;
+ };
+
+ myecap1_pins_default: myecap1-default-pins {
+ pinctrl-single,pins = <
+ J784S4_IOPAD(0x0e8, PIN_INPUT, 1) /* (AR38) TIMER_IO0.ECAP1_IN_APWM_OUT */
+ >;
+ };
+
+ myecap2_pins_default: myecap2-default-pins {
+ pinctrl-single,pins = <
+ J784S4_IOPAD(0x0ec, PIN_INPUT, 1) /* (AN37) TIMER_IO1.ECAP2_IN_APWM_OUT */
+ >;
+ };
+
};
+&ecap0 {
+ /* ECAP in Capture mode */
+ pinctrl-names = "default";
+ pinctrl-0 = <&myecap0_pins_default>;
+ status = "okay";
+ };
+
+&ecap1 {
+ /* ECAP in Capture mode */
+ pinctrl-names = "default";
+ pinctrl-0 = <&myecap1_pins_default>;
+ status = "okay";
+};
+
+&ecap2 {
+ /* ECAP in Capture mode */
+ pinctrl-names = "default";
+ pinctrl-0 = <&myecap2_pins_default>;
+ status = "okay";
+};
+
+
&wkup_pmx2 {
bootph-all;
wkup_uart0_pins_default: wkup-uart0-default-pins {
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
index a7cecbdbc..a6ad9b4b9 100644
--- a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
@@ -1425,6 +1425,36 @@ serdes4: serdes@5050000 {
};
};
+ ecap0: capture@3100000 {
+ compatible = "ti,am62-ecap-capture";
+ reg = <0x00 0x3100000 0x00 0x100>;
+ power-domains = <&k3_pds 126 TI_SCI_PD_EXCLUSIVE>;
+ clocks = <&k3_clks 126 0>;
+ clock-names = "fck";
+ interrupt-parent = <&gic500>;
+ interrupts = <GIC_SPI 293 IRQ_TYPE_EDGE_RISING>;
+ };
+
+ ecap1: capture@3110000 {
+ compatible = "ti,am62-ecap-capture";
+ reg = <0x00 0x3110000 0x00 0x100>;
+ power-domains = <&k3_pds 127 TI_SCI_PD_EXCLUSIVE>;
+ clocks = <&k3_clks 127 0>;
+ clock-names = "fck";
+ interrupt-parent = <&gic500>;
+ interrupts = <GIC_SPI 294 IRQ_TYPE_EDGE_RISING>;
+ };
+
+ ecap2: capture@3120000 {
+ compatible = "ti,am62-ecap-capture";
+ reg = <0x00 0x3120000 0x00 0x100>;
+ power-domains = <&k3_pds 128 TI_SCI_PD_EXCLUSIVE>;
+ clocks = <&k3_clks 128 0>;
+ clock-names = "fck";
+ interrupt-parent = <&gic500>;
+ interrupts = <GIC_SPI 295 IRQ_TYPE_EDGE_RISING>;
+ };
+
main_navss: bus@30000000 {
bootph-all;
compatible = "simple-bus";
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4.dtsi
index 5b09c97cf..8c2a07436 100644
--- a/arch/arm64/boot/dts/ti/k3-j784s4.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j784s4.dtsi
@@ -259,6 +259,9 @@ cbass_main: bus@100000 {
<0x44 0x00000000 0x44 0x00000000 0x00 0x08000000>, /* PCIe2 DAT0 */
<0x44 0x10000000 0x44 0x10000000 0x00 0x08000000>, /* PCIe3 DAT0 */
<0x4e 0x20000000 0x4e 0x20000000 0x00 0x00080000>, /* GPU */
+ <0x00 0x03100000 0x00 0x03100000 0x00 0x00000100>, /* Ecap0 */
+ <0x00 0x03110000 0x00 0x03110000 0x00 0x00000100>, /* Ecap1*/
+ <0x00 0x03120000 0x00 0x03120000 0x00 0x00000100>, /* Ecap2*/
/* MCUSS_WKUP Range */
<0x00 0x28380000 0x00 0x28380000 0x00 0x03880000>,
--
2.34.1
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用户空间脚本：
#!/bin/bash cd /sys/bus/counter/devices/counter0/signal1 echo positive > polarity0 echo negative > polarity1 echo positive > polarity2 echo negative > polarity3 cd /sys/bus/counter/devices/counter0/count0/ freq=$(cat /sys/bus/counter/devices/counter0/signal0/frequency) ceiling=$(cat /sys/bus/counter/devices/counter0/count0/ceiling) echo 0 > num_overflows echo 0 > count echo 1 > enable devmem2 0x3100028 w 0x003600EE #ECCTL devmem2 0x310002C w 0x003E0000 #ECINT_EN echo 0 > enable echo 1 > enable while true; do sleep 5 cap0_val=$(cat capture0) cap1_val=$(cat capture1) cap2_val=$(cat capture2) cap3_val=$(cat capture3) if [ "$cap1_val" -lt "$cap2_val" ]; then period_cnt=$(( cap1_val + cap2_val )) period=$(echo "scale=2; $period_cnt / $freq" | bc) high_cnt=$(( cap2_val )) duty=$(bc <<< "scale=2; $high_cnt / $period_cnt * 100") echo "Valid capture detected." echo "Period Count: $period_cnt" echo "High Count: $high_cnt" echo "Period (s): $period" echo "Duty Cycle: $duty%" break else echo "Invalid capture: cap0_val=$cap0_val, cap1_val=$cap1_val, cap2_val=$cap2_val, cap3_val=$cap3_val" echo "Retrying..." sleep 1 fi done echo "Final captured values:" echo "cap0_val: $cap0_val" echo "cap1_val: $cap1_val" echo "cap2_val: $cap2_val" echo "cap3_val: $cap3_val" echo 0 > enable
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此致
Gokul