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HiKey(LeMaker version):
如何控制开发板GPIO
HiKey开发板有20各GPIO bank(GPIO0-GPIO19)
每个bank都有几个基础值如下表所示
如何计算GPIO PIN值
GPIO PIN脚可以通过用户空间操作sysfs来访问
默认的内核配置已经将物理GPIO和sysfs的映射关系打开
在导入和导出前,只需要获得相应的GPIO的PIN脚编号即可
HiKey开发板的计算方法如下所示:
对于某个具体的PIN脚值 = 该PIN脚所在bank上的基础值 + PIN脚的index(offset)
GPIO0: GPIO0*NUMBER* = 504 + *NUMBER*, for example, GPIO0_7 = 504 + 7 = 511
GPIO1: GPIO1*NUMBER* = 496 + *NUMBER*, for example, GPIO1_5 = 496 + 5 = 501
GPIO2: GPIO2*NUMBER* = 488 + *NUMBER*, for example, GPIO2_4 = 488 + 4 = 492
GPIO3: GPIO3*NUMBER* = 480 + *NUMBER*, for example, GPIO3_6 = 480 + 6 = 486
GPIO4: GPIO4*NUMBER* = 472 + *NUMBER*, for example, GPIO4_6 = 472 + 6 = 478
GPIO5: GPIO5*NUMBER* = 464 + *NUMBER*, for example, GPIO5_3 = 464 + 3 = 467
GPIO6: GPIO6*NUMBER* = 456 + *NUMBER*, for example, GPIO6_2 = 456 + 2 = 458
GPIO7: GPIO7*NUMBER* = 448 + *NUMBER*, for example, GPIO7_1 = 448 + 1 = 449
GPIO8: GPIO8*NUMBER* = 440 + *NUMBER*, for example, GPIO8_5 = 440 + 5 = 445
GPIO9: GPIO9*NUMBER* = 432 + *NUMBER*, for example, GPIO9_6 = 432 + 6 = 438
GPIO10: GPIO10*NUMBER* = 424 + *NUMBER*, for example, GPIO10_5 = 424 + 5 = 429
GPIO11: GPIO11*NUMBER* = 416 + *NUMBER*, for example, GPIO11_3 = 416 + 3 = 419
GPIO12: GPIO12*NUMBER* = 408 + *NUMBER*, for example, GPIO12_1 = 408 + 1 = 409
GPIO13: GPIO13*NUMBER* = 400 + *NUMBER*, for example, GPIO13_1 = 400 + 1 = 401
GPIO14: GPIO14*NUMBER* = 392 + *NUMBER*, for example, GPIO14_4 = 392 + 4 = 396
GPIO15: GPIO15*NUMBER* = 384 + *NUMBER*, for example, GPIO15_5 = 384 + 5 = 389
GPIO16: GPIO16*NUMBER* = 376 + *NUMBER*, for example, GPIO16_2 = 376 + 2 = 378
GPIO17: GPIO17*NUMBER* = 368 + *NUMBER*, for example, GPIO17_1 = 368 + 1 = 369
GPIO18: GPIO18*NUMBER* = 360 + *NUMBER*, for example, GPIO18_7 = 360 + 7 = 367
GPIO19: GPIO19*NUMBER* = 352 + *NUMBER*, for example, GPIO19_6 = 352 + 6 = 358
使用sysfs来控制GPIO
首先需要导出需要操作的GPIO(以GPIO13_6为例)
GPIO13_6 的PIN脚值位 400 + 6 = 406
echo 406 > /sys/class/gpio/export
会产生/sys/class/gpio/gpio406这个目录
To set a GPIO pin as output you have to change the input/output direction with
设置该管脚为输出
echo out > /sys/class/gpio/gpio406/direction
设置该管脚为输入
echo in > /sys/class/gpio/gpio406/direction
查看该管脚高低电平值
cat /sys/class/gpio/gpio406/value
设置该管脚高低电平值
echo 1 > /sys/class/gpio/gpio406/value |
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发表于 2016-9-7 09:00:50
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