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标题: rk3288的I2C-5为什么用不了 [打印本页]

作者: heketuo 时间: 2016-12-8 15:10
标题: rk3288的I2C-5为什么用不了
rk3288的I2C-5在使用中,一直报错"-110",显示是总线busy,用示波器看了sda和scl上没有波形.请问rk3288的I2C-5不能使用吗?

作者: zhansb 时间: 2016-12-9 09:51
firefly的I2C5没有引出来啊

作者: heketuo 时间: 2016-12-9 14:53

zhansb 发表于 2016-12-9 09:51
firefly的I2C5没有引出来啊

版主,你好!我们是用rk3288自己打板的,I2C-5引出来了,且进行了电阻拉高处理.但是每次开机启动内核后i2c-5的电压都会强制拉低了,请问这是为什么?内核里有控制i2c-5强制拉低的吗?

作者: lzhp258 时间: 2016-12-14 09:37
试试修改：
arch/arm/boot/dts/rk3288-pinctrl.dtsi
diff --git a/arch/arm/boot/dts/rk3288-pinctrl.dtsi b/arch/arm/boot/dts/rk3288-pinctrl.dtsi
index 8046018..2de55db 100755
--- a/arch/arm/boot/dts/rk3288-pinctrl.dtsi
+++ b/arch/arm/boot/dts/rk3288-pinctrl.dtsi
@@ -384,21 +384,20 @@

            gpio7_i2c5 {
                     i2c5_sda:i2c5-sda {
-                            rockchip,pins = <EDPHDMII2C_SDA>;
+                            rockchip,pins = <I2C5HDMI_SDA>;
                              rockchip,pull = <VALUE_PULL_NORMAL>;
                              rockchip,drive = <VALUE_DRV_DEFAULT>;
                              //rockchip,tristate = <VALUE_TRI_DEFAULT>;
                     };
-
                     i2c5_scl:i2c5-scl {
-                            rockchip,pins = <EDPHDMII2C_SCL>;
+                            rockchip,pins = <I2C5HDMI_SCL>;
                              rockchip,pull = <VALUE_PULL_NORMAL>;
                              rockchip,drive = <VALUE_DRV_DEFAULT>;
                              //rockchip,tristate = <VALUE_TRI_DEFAULT>;
                     };

                     i2c5_gpio: i2c5-gpio {
-                            rockchip,pins = <FUNC_TO_GPIO(EDPHDMII2C_SDA)>, <FUNC_TO_GPIO(EDPHDMII2C_SCL)>;
+                            rockchip,pins = <FUNC_TO_GPIO(I2C5HDMI_SDA)>, <FUNC_TO_GPIO(I2C5HDMI_SCL)>;
                              rockchip,drive = <VALUE_DRV_DEFAULT>;
                     };
            };

作者: 若兮听雨 时间: 2017-2-4 10:00
学习；额

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