Thank you Ralf!
I'll try it out and update
On Friday, February 14, 2014 10:29:26 PM UTC+2, matt wrote:
>
> Hi,
> I used the following device tree overlay to configure "GPIO1_16" (which is
> P9-15) to Mode-7 (=GPIO):
> //file name: BB-gpio-set-00A0.dts
>
> /dts-v1/;
> /plugin/;
>
>
> / {
> compatible = "ti,beaglebone", "ti,beaglebone-black";
>
>
> /* identification */
> part-number = "BB-LED";
> version = "00A0";
>
>
> /* state the resources this cape uses */
> exclusive-use =
> /* the pin header uses */
> "P9.15", /* GPIO1_16 */
> /* the hardware ip uses */
> "GPIO1_16";
>
>
> fragment@0 {
> target = <&am33xx_pinmux>;
> __overlay__ {
> bb_GPIO1_16_pins: pinmux_bb_GPIO1_16_pins {
> pinctrl-single,pins = <
> 0x40 0x07 /* P9.15 OUTPUT */
> >;
> };
> };
> };
> };
>
>
> Then, I compiled it with dtc, copied the dtbo file to /lib/firmware/,
> and performed *echo BB-gpio-set* *> slots*
>
> Now, I ran the following Code to turn on GPIO1_16, but the code does not
> turn it ON.
>
> *Why it that please?*
>
>
> #include <stdio.h>
> #include <unistd.h>
> #include <string.h>
> #include <sys/mman.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <stdlib.h>
>
>
> #define GPIO1_BASE 0x4804C000
> #define GPIO1_END 0x4804CFFF
> #define GPIO1_SIZE GPIO1_END-GPIO1_BASE
> #define GPIO_OE 0x0134
> #define GPIO_DATAOUT 0x013C
> #define GPIO_USERBUTTON 7
> #define GPIO1_16 16 //GPIO1_16
> #define GPIO_SETDATAOUT 0x194
> #define GPIO_CLEARDATAOUT 0x190
>
>
> int main(int argc, char** argv)
> {
> volatile unsigned int *reg, *reg_base, *reg_clr;
> unsigned int value;
> int fd = open("/dev/mem", O_RDWR);
>
>
> /* LED0 Setup and Turn-on */
>
> //Set GPIO_OE to Output
> reg_base =(volatile unsigned int*) mmap(0,GPIO1_SIZE, PROT_READ
> |PROT_WRITE
> , MAP_SHARED, fd, GPIO1_BASE);
> reg = (volatile unsigned int*)(reg_base + GPIO_OE);
> value = *(reg);
> value &= ~(1 << GPIO1_16);
> *(reg) = value;
>
> //set GPIO_SETDATAOUT to turn LED on
> reg = (volatile unsigned int*)(reg_base + GPIO_SETDATAOUT);
> value = *(reg);
> value |= (1 << GPIO1_16);
> *(reg) = value;
>
>
> return 0;
> }
>
>
>
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