Nanopi Core 2 dev/ttyS2 问题

使用中发现，nanopi core 2的ttyS2不能正常发送数据，下载了H5的数据手册，发现TX引脚和RX引脚的功能选择配置如下：

通过gpio readall指令获取的信息如下：

root@SK_PI:/# gpio readall
 +-----+-----+----------+------+---+-NanoPi NEO/NEO2--+------+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 |     |     |     3.3V |      |   |  1 || 2  |   |      | 5V       |     |     |
 |  12 |   8 |  GPIOA12 |  OFF | 0 |  3 || 4  |   |      | 5V       |     |     |
 |  11 |   9 |  GPIOA11 |  OFF | 0 |  5 || 6  |   |      | 0v       |     |     |
 | 203 |   7 |  GPIOG11 |  OFF | 0 |  7 || 8  | 0 | ALT5 | GPIOG6   | 15  | 198 |
 |     |     |       0v |      |   |  9 || 10 | 0 | ALT5 | GPIOG7   | 16  | 199 |
 |   0 |   0 |   GPIOA0 | ALT2 | 1 | 11 || 12 | 0 | OUT  | GPIOA6   | 1   | 6   |
 |   2 |   2 |   GPIOA2 | ALT2 | 0 | 13 || 14 |   |      | 0v       |     |     |
 |   3 |   3 |   GPIOA3 | ALT2 | 0 | 15 || 16 | 0 | OFF  | GPIOG8   | 4   | 200 |
 |     |     |     3.3v |      |   | 17 || 18 | 0 | OFF  | GPIOG9   | 5   | 201 |
 |  64 |  12 |   GPIOC0 | ALT4 | 0 | 19 || 20 |   |      | 0v       |     |     |
 |  65 |  13 |   GPIOC1 | ALT4 | 0 | 21 || 22 | 0 | ALT5 | GPIOA1   | 6   | 1   |
 |  66 |  14 |   GPIOC2 | ALT4 | 0 | 23 || 24 | 1 | OUT  | GPIOC3   | 10  | 67  |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+-NanoPi NEO/NEO2--+------+----------+-----+-----+

 +-----+----NanoPi NEO/NEO2 Debug UART-+----+
 | BCM | wPi |   Name   | Mode | V | Ph |
 +-----+-----+----------+------+---+----+
 |   4 |  17 |   GPIOA4 | ALT5 | 0 | 37 |
 |   5 |  18 |   GPIOA5 | ALT5 | 0 | 38 |
 +-----+-----+----------+------+---+----+

 

发现其中UART2的TX 配置为ALT2，而RX配置为ALT5，跟数据手册不匹配。