PROCESSOR-SDK-AM62X: 怎么通过寄存器直接操作gpio

飞凌FAE

Prodigy 100 points

Part Number: PROCESSOR-SDK-AM62X

目前我需要在uboot最早的节点通过寄存器操作gpio，但是遇到一个问题，如下如，我找不到GPIO0_set_DATA01这个寄存器的相关描述，相同，下面说的寄存器在什么位置能看到，或者您那边又在uboot阶段操作gpio的方法吗

2 months ago

0 Shine 2 months ago

TI__Guru**** 314677 points

请参考下面的帖子。
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/883144/processor-sdk-am65x-accessing-gpio-pins-in-u-boot

0 飞凌FAE 2 months ago

Prodigy 100 points

能给一个在62xx上调用例子吗，我这边验证不成功，不太一样

0 飞凌FAE 2 months ago in reply to 飞凌FAE

Prodigy 100 points

gpio0_encry_pins_default: gpio0_encry_pins_default {
pinctrl-single,pins = <
AM62X_IOPAD(0x0ac, PIN_OUTPUT, 7) /* (L21) GPMC0_CSn1.GPIO0_42 */
>;
};

&main_gpio0 {
pinctrl-names = "default";
pinctrl-0 = <&gpio0_encry_pins_default>;
status = "okay";
};

看看哪里有问题

0 Shine 2 months ago in reply to 飞凌FAE

TI__Guru**** 314677 points

飞凌FAE said:
我这边验证不成功

请问具体怎么不成功？

0 飞凌FAE 2 months ago in reply to Shine

Prodigy 100 points

控制了1s亮，1s灭，但实际情况一直是低电平

0 飞凌FAE 2 months ago in reply to 飞凌FAE

Prodigy 100 points

我按照6254的芯片手册描述，直接操作寄存器，也是不生效，如下是我在uboot的spl_board_init函数中，控制gpio0_42的代码，电平也是没变化，您看看是不是cpu芯片手册写错了

/*Write 100h to the GPIO_SET_DATA23*/
writel(0x400, 0x00600040);

/*Write 0h to the GPIO_DIR23 register to configure as output pin*/
writel(0xfbff, 0x00600038);

/*Read in GPIO_OUT_DATA23 register, change bit 10 to 0x1,
and write the new value back to GPIO_OUT_DATA23*/
gpio_val = readl(0x0060003c);
printf("gpio-val=%x\n",gpio_val);

gpio_val = gpio_val|BIT(10);

printf("gpio-val=%x\n",gpio_val);
writel(gpio_val,0x0060003c);