cat /sys/kernel/debug/gpio
cat /proc/bus/input/devices
#define GPIO_BANK0 (0 << RK_GPIO_BANK_OFFSET)
#define GPIO_BANK1 (1 << RK_GPIO_BANK_OFFSET)#define GPIO_BANK2 (2 << RK_GPIO_BANK_OFFSET)
#define GPIO_BANK3 (3 << RK_GPIO_BANK_OFFSET)
#define GPIO_BANK4 (4 << RK_GPIO_BANK_OFFSET)
#define GPIO_BANK5 (5 << RK_GPIO_BANK_OFFSET)
#define GPIO_BANK6 (6 << RK_GPIO_BANK_OFFSET)
#define GPIO_BANK7 (7 << RK_GPIO_BANK_OFFSET)
#define GPIO_BANK8 (8 << RK_GPIO_BANK_OFFSET)
#define RK_GPIO_BANK_OFFSET 8
#define GPIO_A0 0
#define GPIO_A1 1
#define GPIO_A2 2
#define GPIO_A3 3
#define GPIO_A4 4
#define GPIO_A5 5
#define GPIO_A6 6
#define GPIO_A7 7
#define GPIO_B0 8
#define GPIO_B1 9
#define GPIO_B2 10
#define GPIO_B3 11
#define GPIO_B4 12
#define GPIO_B5 13
#define GPIO_B6 14
#define GPIO_B7 15
#define GPIO_C0 16
#define GPIO_C1 17
#define GPIO_C2 18
#define GPIO_C3 19
#define GPIO_C4 20
#define GPIO_C5 21
#define GPIO_C6 22
#define GPIO_C7 23
#define GPIO_D0 24
#define GPIO_D1 25
#define GPIO_D2 26
#define GPIO_D3 27
#define GPIO_D4 28
#define GPIO_D5 29
#define GPIO_D6 30
#define GPIO_D7 31
如gpio7 GPIO_B4就是(7 << RK_GPIO_BANK_OFFSET) | GPIO_D2
简单点的写法就是7x32+12=236
GPIO7_B4=236 //M180_V3 << SPICLLK
GPIO7_B5=237 //M180_V3 << SPICSN
shell 测试GPIO输出驱动
echo 236 > /sys/class/gpio/export //打开指定GPIO
echo out > /sys/class/gpio/gpio236/direction //修改为输出
echo 1 >/sys/class/gpio/gpio236/value //写入输出值 0 或者1
poll示例：
memset((void *)xfds, 0, sizeof(xfds));
xfds[0].fd = fd;
xfds[0].events = POLLPRI;
ret = poll(xfds, 1, -1);
if(ret <= 0)
ERREXIT("poll value");
if(xfds[0].revents & POLLPRI)
{
/* get value */
ret = lseek(fd, 0, SEEK_SET);
if(ret < 0)
ERREXIT("lseek value");
ret = read(fd, buf, 2);
buf[1] = ' ';
printf("read ret = %d, value = %s
", ret, buf);
if(ret != 2)
ERREXIT("read value");
}
select示例：
FD_ZERO(&exceptfds);
FD_SET(fd, &exceptfds);
ret = select(fd+1,NULL,NULL,&exceptfds,NULL);
if(ret < 0)
ERREXIT("select value");
//else if(ret > 0)
if(ret > 0)
{
/* get value */
ret = lseek(fd, 0, SEEK_SET);
if(ret < 0)
ERREXIT("lseek value");
ret = read(fd, buf, 2);
buf[1] = ' ';
printf("read ret = %d, value = %x
", ret, buf[0]);
if(ret != 2)
ERREXIT("read value");
}
RK3288 GPIO 输出驱动电流能力有限，请知悉！！！max_current <=100MA