本文转载自：http://blog.csdn.net/kris_fei/article/details/54574073
标签： rk3288 串口添加
2017-01-16 14:52 1079人阅读 评论(0) 收藏 举报
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Platform: ROCKCHIP
OS: Android 6.0
Kernel:
3.10.92
uart0,1,3,4 (普通串口) 用的是同一个串口驱动.
uart2(调试串口)的驱动代码嵌在fiq
debugger的code中.
相关的配置在rk3288.dtsi中:
aliases {
serial0 =
&uart_bt;
serial1 = &uart_bb;
serial2 =
&uart_dbg;
serial3 = &uart_gps;
serial4 =
&uart_exp;
......
}
uart_bb: [email protected] {
compatible = "rockchip,serial";
reg = <0xff190000 0x100>;
interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
clock-frequency =
<24000000>;
clocks = <&clk_uart1>, <&clk_gates6
9>;
clock-names = "sclk_uart", "pclk_uart";
reg-shift =
<2>;
reg-io-width = <4>;
dmas = <&pdma1 3>,
<&pdma1 4>;
#dma-cells = <2>;
pinctrl-names =
"default";
pinctrl-0 = <&uart1_xfer &uart1_cts
&uart1_rts>;
status =
"disabled";
};
假设这里要使用uart1,也就是uart_bb, 那么只要在主dts中添加:
&uart_bb {
status = "okay";
dma-names = "!tx", "!rx";
};
另外,由于uart1默认作为base
band通信用,所以在.rc修改成你需要的权限
diff --git a/init.connectivity.rc
b/init.connectivity.rc
index 71d125a..1e06417 100755
---
a/init.connectivity.rc
+++ b/init.connectivity.rc
@@ -54,10 +54,8 @@ on
boot
# bluetooth power up/down interface
chmod 0660
/dev/ttyS0
- chmod 0660
/dev/ttyS1
chmod 0660 /dev/vflash
chown bluetooth
net_bt_stack /dev/vflash
- chown bluetooth
net_bt_stack /dev/ttyS1
chown bluetooth net_bt_stack
/dev/ttyS0
chown bluetooth net_bt_stack
/sys/class/rfkill/rfkill0/type
chown bluetooth net_bt_stack
/sys/class/rfkill/rfkill0/state
diff --git a/ueventd.rockchip.rc
b/ueventd.rockchip.rc
index b7f45c2..c6d773a 100644
---
a/ueventd.rockchip.rc
+++ b/ueventd.rockchip.rc
@@ -31,6 +31,9
@@
/dev/mirroring 0664 media
media
/dev/iep 0660 media media
+#Kris
+/dev/ttyS1 0666 system
system
+
# for Sensor HAL
/dev/akm8973 0660
system system
/dev/accelerometer 0660 system
system
测试:
可以弄两块板子, 然后将两个一样的串口连接起来,一块收一块发
1.
#
cat /dev/ttyS1
2.
# echo test > /dev/ttyS1