| 需求：使用I2S0播放声音。 在设备树中增加dummy-codec和simple-audio-card节点，内核配置增加CONFIG_SND_SOC_DUMMY_CODEC=y， 重新编译SDK后，I2S0的几个引脚都有输出，但是播放无声，使用示波器观察I2S_CLK发现波形很不标准，应该是I2S_CLK波形不标准导致无正常播放声音。 载板使用是官方载板。 请问这个问题应该如何解决，以下是示波器拍照图片和设备树文件。 /dts-v1/; #include "rk3399-firefly-port.dtsi" #include <dt-bindings/sensor-dev.h> #include <dt-bindings/display/media-bus-format.h> / { test-power { status = "okay"; }; rt5640-sound { status = "disabled"; simple-audio-card,cpu { sound-dai = <&i2s1>; }; simple-audio-card,codec { sound-dai = <&rt5640>; }; }; adc-keys { compatible = "adc-keys"; io-channels = <&saradc 1>; io-channel-names = "buttons"; poll-interval = <300>; keyup-threshold-microvolt = <1800000>; esc-key { linux,code = <KEY_ESC>; label = "esc"; press-threshold-microvolt = <0>; }; }; fan_ctl: fan-ctl-regulator { compatible = "regulator-fixed"; enable-active-high; regulator-always-on; regulator-boot-on; gpio = <&gpio3 10 GPIO_ACTIVE_HIGH>; pinctrl-names = "default"; regulator-name = "fan_ctl"; pinctrl-0 = <&fan_drv>; }; NPU5801_PWR_EN: HUB20-PWR-EN { compatible = "regulator-fixed"; enable-active-high; regulator-always-on; regulator-boot-on; gpio = <&gpio0 2 GPIO_ACTIVE_HIGH>; pinctrl-names = "default"; pinctrl-0 = <&npu5801_pwr_en>; regulator-name = "vcc5v0_5801_en"; status = "okay"; }; dummy_codec: dummy-codec { compatible = "rockchip,dummy-codec"; #sound-dai-cells = <0>; clocks = <&cru SCLK_I2S_8CH_OUT>; clock-names = "mclk"; pinctrl-names = "default"; pinctrl-0 = <&i2s_8ch_mclk>; status = "okay"; }; dummy-sound { status = "okay"; compatible = "simple-audio-card"; simple-audio-card,format = "i2s"; simple-audio-card,name = "rockchip,dummy-codec"; simple-audio-card,mclk-fs = <256>; simple-audio-card,cpu { sound-dai = <&i2s0>; }; simple-audio-card,codec { sound-dai = <&dummy_codec>; }; }; }; &gmac { /delete-property/ snps,force_thresh_dma_mode; tx_delay = <0x2F>; rx_delay = <0x1E>; }; &vcc_sd_h { rockchip,pins = <1 22 RK_FUNC_GPIO &pcfg_pull_up>; }; &vcc_sd { gpio = <&gpio1 22 GPIO_ACTIVE_HIGH>; }; &hdmi_dp_sound { status = "okay"; }; &i2c2 { status = "disabled"; i2c-scl-rising-time-ns = <300>; i2c-scl-falling-time-ns = <15>; sensor@4c { status = "disabled"; compatible = "gs_mc3230"; reg = <0x4c>; type = <SENSOR_TYPE_ACCEL>; irq_enable = <0>; poll_delay_ms = <30>; layout = <1>; }; }; &rt5640 { hp-det-adc-value = <900>; aux-det-adc-value = <900>; hp-con-gpio = <&gpio3 16 GPIO_ACTIVE_HIGH>; io-channels = <&saradc 3>,<&saradc 2>; io-channel-names = "hp-det","aux-det"; status = "disabled"; }; &rt5640_hpcon{ rockchip,pins = <3 16 RK_FUNC_GPIO &pcfg_pull_none>; }; &vcca1v8_codec { regulator-min-microvolt = <900000>; regulator-max-microvolt = <900000>; }; &spi1 { dev-port = <0>; status = "okay"; }; &spi_wk2xxx { status = "okay"; reset-gpio = <&gpio1 2 GPIO_ACTIVE_HIGH>; irq-gpio = <&gpio2 8 IRQ_TYPE_EDGE_FALLING>; cs-gpio = <&gpio1 10 GPIO_ACTIVE_HIGH>; }; &vcc3v3_3g { gpio = <&gpio2 28 GPIO_ACTIVE_HIGH>; }; &vcc3v3_pcie { /delete-property/ gpio; }; &pcie0 { ep-gpios = <&gpio4 30 GPIO_ACTIVE_HIGH>; }; &uart4 { status = "disabled"; }; &dp_in_vopb { status = "disabled"; }; &hdmi_in_vopl { status = "disabled"; }; &wdt { status = "disabled"; }; &io_domains { bt656-supply = <&vcc_3v0>; }; &vcc2v8_dvp { regulator-min-microvolt = <1800000>; regulator-max-microvolt = <1800000>; }; &vcca1v8_codec { regulator-min-microvolt = <900000>; regulator-max-microvolt = <900000>; }; &fusb0 { status = "disabled"; }; &cdn_dp { status = "disabled"; }; &tcphy0 { /delete-property/ extcon; status = "okay"; }; &u2phy0 { status = "okay"; /delete-property/ extcon; u2phy0_otg: otg-port { rockchip,vbus-always-on; vbus-5v-gpios = <&gpio1 3 GPIO_ACTIVE_HIGH>; status = "okay"; }; }; &usbdrd3_0 { status = "okay"; /delete-property/ extcon; }; &usbdrd_dwc3_0 { dr_mode = "host"; }; &route_hdmi { status = "okay"; }; &rk808 { /delete-property/ pmic,stby-gpio; /delete-property/ pmic,hold-gpio; }; &vcc_mipi { status = "okay"; }; &dvdd_1v2 { status = "okay"; }; &ov13850 { pwdn-gpios = <&gpio2 1 GPIO_ACTIVE_HIGH>; status = "okay"; }; &ov13850_1 { pwdn-gpios = <&gpio2 0 GPIO_ACTIVE_HIGH>; status = "okay"; }; &rkisp1_0 { status = "okay"; }; &mipi_dphy_rx0 { status = "okay"; }; &isp0_mmu { status = "okay"; }; &rkisp1_1 { status = "okay"; }; &mipi_dphy_tx1rx1 { status = "okay"; }; &isp1_mmu { status = "okay"; }; &pinctrl { pinctrl-names = "default"; pinctrl-0 = <&host_hub_vcc>; npu_pwr_en { // control VCC5V0_HOST3 npu5801_pwr_en: npu5801-pwr-en { rockchip,pins = <0 2 RK_FUNC_GPIO &pcfg_pull_up>; }; }; host-hub-vcc { host_hub_vcc: host-hub-vcc { rockchip,pins = <2 4 RK_FUNC_GPIO &pcfg_output_high>, <4 29 RK_FUNC_GPIO &pcfg_output_high>; }; }; pcie { pcie_3g_drv: pcie-3g-drv { rockchip,pins = <2 6 RK_FUNC_GPIO &pcfg_pull_up>; }; }; vcc_sd { vcc_sd_h: vcc-sd-h { rockchip,pins = <1 22 RK_FUNC_GPIO &pcfg_pull_up>; }; }; fan-ctl { fan_drv: fan-drv { rockchip,pins = <3 10 RK_FUNC_GPIO &pcfg_pull_none>; }; }; }; |
