i want to set uart0_rts to output pin.
#define TEGRA_GPIO_BANK_ID_D 3
GPIO3_PD.03 = 3*8+3 = 27
i exec command:
cd /sys/class/gpio
echo 27 > export
cd gpio27
echo out > direction
cat value is 0
but the signal is high-level.
and when i set value to 1, the signal is high-level also.
how can i control the gpio 27?
hello y2zwei,
there’s customer usage to define the pin as UC3_RTS by default, its device tree configuration shown as below.
uart3_rts_pd3 {
nvidia,pins = "uart3_rts_pd3";
nvidia,function = "uartc";
nvidia,pull = <TEGRA_PIN_PULL_UP>;
nvidia,tristate = <TEGRA_PIN_DISABLE>;
nvidia,enable-input = <TEGRA_PIN_DISABLE>;
};
sry, I measured the wrong pin.