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器件型号:BEAGLEBN
工具/软件:Linux
我尝试使 PWM 正常工作、但没有成功。 我将 TI SDK 与 AM335x-bonebblack.dts 器件树的修改版本配合使用(请参阅下面的内容)
PWM 驱动器(ehrpwm1)探针正确、并显示在/sys/class/pwm/pwmchip0.中 然后、我配置了芯片
cd /sys/class/pwm/pwmchip0 echo 0 > export echo 1000000 > pwm0/周期 echo 250000 > pwm0/Duty_cycle echo 1 > pwm0/enable
但是、没有 PWM 输出。 我是否遗漏了明显的东西?
/dts-v1/; #include "am33xx.dtsi" #include "am335x-bone-common.dtsi" /{ 型号="TI AM335x BeagleBone Black"; 兼容="ti、am335x-bone-black"、"ti、am335x-bone-bone-"、"ti、am33xx"; } &ldo3_reg{ reguler-min-microvolt =<1800000>; reguler-max-microvolt =<1800000>; reguler-always on; } ;&mmc1{ VMMC-supply =<&vmmcsd_fixed>; } ;&mmc2{ VMMC-supply =<&vmmcsd_fix>; pinctrl =默认值<&trls-nation>;"trls-names ="&trls-nations";&trl ="intrls-nations";&trl =默认值="ctrl宽度<&trls-names" }; &am33xx_pinmux{ LCD_PINS:LCD_PINS{ pinctrl-single、PIN=< AM33XX_IOPAD (0x8a0、PIN_OUTPUT | MUX_MODE0)/* P9.45、LCD_Data0 * AM33XX_IOPAD (0x8a4、PIN_OUTP_0* 、0x3304_MO0*/AM3304_MODIO0*/AM3320_MODIO0*/AM3320_MODIO0*/AM334_MODIOXX_MODIO0*、0x43_MODIO0*/AM334*输出*/AM33XX_MODIO0_MODIO0_MODIO0*/AM3320_MODIO0_MODIOXX_MODIO0_MODIO0* 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)* 、0x338_LCD_0*/AM338_MODIO8* 、0x38*/MR_0*输出*/MR_MODIO0* 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)* P9.35、LCD_DIO23 * 、LCD_DATAD_0*、0x83*/AM338_MODIO23 (0x24_MODE8)*/AM33_IN_IN_MODIOXX_IN_IN_OUTP_0*、0x83*、0x24_MODIOXX_0*、0x24_MODIOXX_IN_IN_IN_MODIO23 PIN_OUTPUT | MUX_MODE1)/* P9.13、LCD_data22 */ AM33XX_IOPAD (0x828、PIN_OUTPUT | MUX_MODE1)/* P9.14、LCD_data21 * / AM33XX_IOPAD (0x82c、PIN_MODE1)/MUX_MODIO1*、0x8320*/MR_IN_MODIO12* 、 0x384*/MR_IN_MODIOXX_IN_OUTP_18*、0x3312*、0x3320_MODIO12* PIN_OUTPUT | MUX_MODE1)/* P9.15、LCD_data16 */ AM33XX_IOPAD (0x8e0、PIN_OUTPUT 下 拉| MUX_MODE0)/* P9.27、LCD_vsync */ AM33XX_IOPAD (0x8e4、PIN_OUTPUT | MUX_MODE0) *、M08_MODIV_LCD_MODE8 */0x309.30 */MR_MOUX_SYSC_MODEV (0x80*/MR_MODE8)*/MR_MODIV_O8_P08*/MR_MODE_MODIV_RUS_RUL_MODE8)* GPIO2[1]*/ >; }; backlight_pin:backlight_pin{ pinctrl-single、pins =< AM33XX_IOPAD (0x848、PIN_OUTPUT | MUX_MODE6)>;// P9.14、GPIO1[18]* ; toucher_pins:toucher_pins{ pincr-single-single、MUX_MODE6)>;// pullup = 0x339_pinu_pinu_pinu_pinu_pinu_pinu_pinu_pinu_pinu_pinu_pinu_pinu_pinu_pinu_pin Dcan0_PINS{ pinctrl-single、PINS =< AM33XX_IOPAD (0x97c、PIN_INPULLUP | MUX_MODE2)/* P9.19、ddcan0_Rx */ AM33XX_IOPAD (0x978、PIN_OUTPLUP | MUX_MODE2)/* P9.19、ddARTx20_IN_IND * = 0x804_IND_IND_IND;*引脚0x20_MODON_MODON_INUARTON_P= 0x804_MOD_INUART_IND_IND_IND20_P= 0x804*;*引 脚;*引脚0x804_MOD20_MOD_INDON_INDON_P= 0x804_IN_IND_IND_P= 0x804_INDON_INDON_IND_P= 0x20_MODON_MODON_P uart2_pins{ pinctrl-single、pins =< AM33XX_IOPAD (0x950、PIN_INPUT_PULLUP | MUX_MODE1)/* P9.22、uart2_RxD */ AM33XX_IOPAD (0x954、PIN_OUTPLUG_PULLUX)/* P9.22、uart2_RXD * = 0x3820_IN_INUDIOxx、0x4引脚 ;*引脚4、UARTART284_IN_IN_INUARTON_INUARTON_P= 0x874_IN_IN_INUARTON_P= 0x4; *引 脚;*引脚 uart5_pins{ pinctrl-single、pins =< AM33XX_IOPAD (0x8c4、PIN_INPUT_PULLUX | MUX_MODE4)/* P8.38、uart5_RxD */ AM33XX_IOPAD (0x8c0、PIN_OUTPUT_PUTDOWN| MUX_MODE4)/* P8.384*、UARTHREST_Px (0x385_Rx) /* 、*输出= 0x384_M184_Mx、* Px + Px 1、*输出+ M184_MDIOr 1、*引脚;*引脚= 0x381*、0x381_MOU_Px + Px + Px + Px + Px + Px、0x381*、Px 1、Px 1、U_Px 1、U_Px 1、U_Px 1、*输出+ 1、*、UHRM18_ &epwms1{ status ="确定"; } ;&ehrpwm1{ pinctrl-name ="默认值"; pinctrl-0 =<&backlight_pin>; status ="确定"; }; &lcdc{ status ="确定"; 蓝红色接线="交叉"; }; &sgx{ status ="确定 ";"cdtrl";"display" ="默认值=";"cdtrlcdtry"=";"ctl ="显示";"ctl ="默认 值=" pinctrl-0 =<&LCD_PINs>; ENABLE-GPIO =<&GPIO2 1 GPIO_ACTIVE_HIGH>;/* P8.19 */ PALICE-INFO{ AC-BIAS =<255>; AC-BIAS-INIPT =<0>; DMA-BURST-SZ =<16>; bpp =<32>; FDD =<0x80>; sync-edge =<0>; sync-Ctrl =<0>; 光栅顺序=<0>; fifo-th =<0>; }; 显示时序{ native-mode =<&ting0>; ting0:800x480{ 时钟频率=<45000000>; hactive =<800>; vactive =<480>; hfront-c廊=<40>; hback -c廊=<40>; HSYNC-LEN =<48>; 后沿=<29>; 前沿=<13>; VSYNC-LEN =<3>; HSYNC-ACTIVE =<0>; vsync-active =<0>; }; }; }; }; &i2c2{ 多触点:EDT-ft5x06@38{ 兼容="EDT、EDT-ft5406"、"EDT、EDT-ft5x06"; reg =<0x38>; pinctrl-names ="默认"; pinctrl-0 =<&toucher_pines>; interrupt-parent =<&GPIO3>; interrupts =<19 0>;// P9.27 */ Touchson-size-x=<799>; Touchson-size-y=<479>; xfuzz =<0>; yfuzz =<0>; }; }; &RTC{ 系统电源控制器; }; &dcan0{ status ="确定"; pinctrl-name ="默认"; pinctrl-0 =<&dcan0_PINs>; } ;&uart1{ status ="确定"; pinctr-names ="默认"; pinctrl-0 =<&uarttrl> ;"uartns"="默认 值="partns";"pinc2 =";pinctrl"默认值="uartns";"pintrl"="uartns";"uartns"= 2;"pinctrl"="uartns" pinctrl-0 =<uart4_PINs>; };