香橙派Zero2 IO识记

研究一番发现官方没有现成的单总线驱动可用，必须得自己写一个驱动驱动单线设备。

 +------+-----+----------+------+---+  Zero 2  +---+------+----------+-----+------+
 | GPIO | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | GPIO |
 +------+-----+----------+------+---+----++----+---+------+----------+-----+------+
 |      |     |     3.3V |      |   |  1 || 2  |   |      | 5V       |     |      |
 |  229 |   0 |    SDA.3 |  OUT | 1 |  3 || 4  |   |      | 5V       |     |      |
 |  228 |   1 |    SCL.3 |  OUT | 1 |  5 || 6  |   |      | GND      |     |      |
 |   73 |   2 |      PC9 |  OUT | 1 |  7 || 8  | 1 | OUT  | TXD.5    | 3   | 226  |
 |      |     |      GND |      |   |  9 || 10 | 1 | OUT  | RXD.5    | 4   | 227  |
 |   70 |   5 |      PC6 |  OUT | 1 | 11 || 12 | 1 | OUT  | PC11     | 6   | 75   |
 |   69 |   7 |      PC5 |  OUT | 1 | 13 || 14 |   |      | GND      |     |      |
 |   72 |   8 |      PC8 |  OUT | 1 | 15 || 16 | 1 | OUT  | PC15     | 9   | 79   |
 |      |     |     3.3V |      |   | 17 || 18 | 1 | OUT  | PC14     | 10  | 78   |
 |  231 |  11 |   MOSI.1 |  OUT | 1 | 19 || 20 |   |      | GND      |     |      |
 |  232 |  12 |   MISO.1 |  OUT | 1 | 21 || 22 | 1 | OUT  | PC7      | 13  | 71   |
 |  230 |  14 |   SCLK.1 |  OUT | 1 | 23 || 24 | 1 | OUT  | CE.1     | 15  | 233  |
 |      |     |      GND |      |   | 25 || 26 | 1 | OUT  | PC10     | 16  | 74   |
 |   65 |  17 |      PC1 |  OUT | 1 | 27 || 28 |   |      |          |     |      |
 |  272 |  18 |     PI16 |  OUT | 1 | 29 || 30 |   |      |          |     |      |
 |  262 |  19 |      PI6 |  OUT | 1 | 31 || 32 |   |      |          |     |      |
 |  234 |  20 |     PH10 | ALT3 | 0 | 33 || 34 |   |      |          |     |      |
 +------+-----+----------+------+---+----++----+---+------+----------+-----+------+
 | GPIO | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | GPIO |
 +------+-----+----------+------+---+  Zero 2  +---+------+----------+-----+------+

端口占用情况：
已占用：
PC1,pin PC1 already requested by onewire@0; cannot claim for 300b000.pinctrl:65
PC5,pin PC5 already requested by onewire@0; cannot claim for 300b000.pinctrl:69
PC9，pin PC9 already requested by onewire@0; cannot claim for 300b000.pinctrl:73
PC6, pin PC6 already requested by onewire@0; cannot claim for 300b000.pinctrl:70
PC8,pin PC8 already requested by onewire@0; cannot claim for 300b000.pinctrl:72
PC10，pin PC10 already requested by onewire@0; cannot claim for 300b000.pinctrl:74
PC11,pin PC11 already requested by onewire@0; cannot claim for 300b000.pinctrl:75
PC12,PC13是两个板载LED
PH3,w1-gpio onewire@0: gpio_request (pin) failed