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A20 Lime2. I can't use gpio on PG port.

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I'm using Armbian 5.38 stable Debian stretch 4.14.14-sunxi on A20 Lime2.

I try to use PGxx pins (connector GPIO-1 on board), without any luck.

I know i must use formula (position of letter in alphabet - 1) * 32 + pin number, so i have tried (for PG11):

 

echo 203 > /sys/class/gpio/export

echo out > /sys/class/gpio/gpio203/direction

echo 1 > /sys/class/gpio/203/value

 

but nothing happened. I tried from 192 to 203 (PG00 to PG11), but nothing happened.

On the same connector (GPIO-1), PC23, PC18 and PB23 work perfectly.

What am i doing wrong?

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Check this:

sudo cat /sys/kernel/debug/pinctrl/1c20800.pinctrl/pinmux-pins

 

1c20800.pinctrl maybe different in your system. Please check:

sudo ls /sys/kernel/debug/pinctrl/

 

A good book about GPIO in Linux:

GNU-Linux-Rapid-Embedded-Programming 

 

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Thanks for the answer. 

Inside the spoiler my pinmux-pins file:


 

Spoiler

 

homatron@lime2:~$ sudo cat /sys/kernel/debug/pinctrl/1c20800.pinctrl/pinmux-pinsPinmux settings per pin
Format: pin (name): mux_owner gpio_owner hog?
pin 0 (PA0): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA0
pin 1 (PA1): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA1
pin 2 (PA2): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA2
pin 3 (PA3): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA3
pin 4 (PA4): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA4
pin 5 (PA5): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA5
pin 6 (PA6): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA6
pin 7 (PA7): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA7
pin 8 (PA8): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA8
pin 9 (PA9): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 10 (PA10): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA10
pin 11 (PA11): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA11
pin 12 (PA12): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA12
pin 13 (PA13): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA13
pin 14 (PA14): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 15 (PA15): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA15
pin 16 (PA16): 1c50000.ethernet (GPIO UNCLAIMED) function gmac group PA16
pin 17 (PA17): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 32 (PB0): 1c2ac00.i2c (GPIO UNCLAIMED) function i2c0 group PB0
pin 33 (PB1): 1c2ac00.i2c (GPIO UNCLAIMED) function i2c0 group PB1
pin 34 (PB2): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 35 (PB3): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 36 (PB4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 37 (PB5): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 38 (PB6): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 39 (PB7): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 40 (PB8): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 41 (PB9): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 42 (PB10): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 43 (PB11): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 44 (PB12): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 45 (PB13): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 46 (PB14): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 47 (PB15): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 48 (PB16): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 49 (PB17): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 50 (PB18): 1c2b000.i2c (GPIO UNCLAIMED) function i2c1 group PB18
pin 51 (PB19): 1c2b000.i2c (GPIO UNCLAIMED) function i2c1 group PB19
pin 52 (PB20): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 53 (PB21): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 54 (PB22): 1c28000.serial (GPIO UNCLAIMED) function uart0 group PB22
pin 55 (PB23): 1c28000.serial (GPIO UNCLAIMED) function uart0 group PB23
pin 64 (PC0): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 65 (PC1): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 66 (PC2): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 67 (PC3): (MUX UNCLAIMED) 1c20800.pinctrl:67
pin 68 (PC4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 69 (PC5): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 70 (PC6): 1c11000.mmc (GPIO UNCLAIMED) function mmc2 group PC6
pin 71 (PC7): 1c11000.mmc (GPIO UNCLAIMED) function mmc2 group PC7
pin 72 (PC8): 1c11000.mmc (GPIO UNCLAIMED) function mmc2 group PC8
pin 73 (PC9): 1c11000.mmc (GPIO UNCLAIMED) function mmc2 group PC9
pin 74 (PC10): 1c11000.mmc (GPIO UNCLAIMED) function mmc2 group PC10
pin 75 (PC11): 1c11000.mmc (GPIO UNCLAIMED) function mmc2 group PC11
pin 76 (PC12): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 77 (PC13): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 78 (PC14): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 79 (PC15): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 80 (PC16): pwrseq 1c20800.pinctrl:80 function gpio_out group PC16
pin 81 (PC17): (MUX UNCLAIMED) 1c20800.pinctrl:81
pin 82 (PC18): (MUX UNCLAIMED) 1c20800.pinctrl:82
pin 83 (PC19): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 84 (PC20): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 85 (PC21): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 86 (PC22): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 87 (PC23): (MUX UNCLAIMED) 1c20800.pinctrl:87
pin 88 (PC24): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 96 (PD0): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 97 (PD1): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 98 (PD2): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 99 (PD3): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 100 (PD4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 101 (PD5): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 102 (PD6): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 103 (PD7): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 104 (PD8): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 105 (PD9): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 106 (PD10): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 107 (PD11): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 108 (PD12): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 109 (PD13): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 110 (PD14): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 111 (PD15): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 112 (PD16): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 113 (PD17): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 114 (PD18): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 115 (PD19): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 116 (PD20): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 117 (PD21): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 118 (PD22): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 119 (PD23): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 120 (PD24): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 121 (PD25): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 122 (PD26): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 123 (PD27): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 128 (PE0): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 129 (PE1): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 130 (PE2): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 131 (PE3): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 132 (PE4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 133 (PE5): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 134 (PE6): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 135 (PE7): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 136 (PE8): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 137 (PE9): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 138 (PE10): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 139 (PE11): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 160 (PF0): 1c0f000.mmc (GPIO UNCLAIMED) function mmc0 group PF0
pin 161 (PF1): 1c0f000.mmc (GPIO UNCLAIMED) function mmc0 group PF1
pin 162 (PF2): 1c0f000.mmc (GPIO UNCLAIMED) function mmc0 group PF2
pin 163 (PF3): 1c0f000.mmc (GPIO UNCLAIMED) function mmc0 group PF3
pin 164 (PF4): 1c0f000.mmc (GPIO UNCLAIMED) function mmc0 group PF4
pin 165 (PF5): 1c0f000.mmc (GPIO UNCLAIMED) function mmc0 group PF5
pin 192 (PG0): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 193 (PG1): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 194 (PG2): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 195 (PG3): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 196 (PG4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 197 (PG5): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 198 (PG6): 1c28c00.serial (GPIO UNCLAIMED) function uart3 group PG6
pin 199 (PG7): 1c28c00.serial (GPIO UNCLAIMED) function uart3 group PG7
pin 200 (PG8): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 201 (PG9): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 202 (PG10): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 203 (PG11): (MUX UNCLAIMED) 1c20800.pinctrl:203
pin 224 (PH0): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 225 (PH1): (MUX UNCLAIMED) 1c20800.pinctrl:225
pin 226 (PH2): leds 1c20800.pinctrl:226 function gpio_out group PH2
pin 227 (PH3): (MUX UNCLAIMED) 1c20800.pinctrl:227
pin 228 (PH4): 1c13400.phy 1c20800.pinctrl:228 function gpio_in group PH4
pin 229 (PH5): 1c13400.phy 1c20800.pinctrl:229 function gpio_in group PH5
pin 230 (PH6): (MUX UNCLAIMED) 1c20800.pinctrl:230
pin 231 (PH7): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 232 (PH8): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 233 (PH9): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 234 (PH10): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 235 (PH11): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 236 (PH12): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 237 (PH13): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 238 (PH14): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 239 (PH15): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 240 (PH16): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 241 (PH17): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 242 (PH18): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 243 (PH19): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 244 (PH20): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 245 (PH21): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 246 (PH22): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 247 (PH23): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 248 (PH24): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 249 (PH25): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 250 (PH26): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 251 (PH27): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 256 (PI0): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 257 (PI1): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 258 (PI2): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 259 (PI3): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 260 (PI4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 261 (PI5): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 262 (PI6): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 263 (PI7): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 264 (PI8): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 265 (PI9): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 266 (PI10): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 267 (PI11): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 268 (PI12): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 269 (PI13): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 270 (PI14): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 271 (PI15): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 272 (PI16): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 273 (PI17): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 274 (PI18): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 275 (PI19): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 276 (PI20): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 277 (PI21): (MUX UNCLAIMED) (GPIO UNCLAIMED)


 

 

I have tested PC18, PC23 and PG11.

PC18 and PC23 works when i echo > value 0 or 1 (0.02 Volt for 0 and 3.302 Volt for 1). PG11 do not.

But in pinmux-pins file seem there are no differences between the pins:

 

pin 82 (PC18): (MUX UNCLAIMED) 1c20800.pinctrl:82

pin 87 (PC23): (MUX UNCLAIMED) 1c20800.pinctrl:87

pin 203 (PG11): (MUX UNCLAIMED) 1c20800.pinctrl:203

 

Some idea?

 

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