boards: arm: twr_ke18f: add ADC support

Add support for reading the onboard potentiometer (ADC0 channel 12) and thermistor (ADC0 channels 0 and 1). Signed-off-by: Henrik Brix Andersen <[email protected]>
mlaz · Jun 7, 2019 · ac42942 · ac42942
1 parent ca38f0a
commit ac42942
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diff --git a/boards/arm/twr_ke18f/Kconfig.defconfig b/boards/arm/twr_ke18f/Kconfig.defconfig
@@ -75,4 +75,11 @@ config GPIO_MCUX_PORTE
 
 endif # GPIO_MCUX
 
+if ADC
+
+config ADC_0
+	default y
+
+endif # ADC
+
 endif # BOARD_TWR_KE18F
diff --git a/boards/arm/twr_ke18f/doc/index.rst b/boards/arm/twr_ke18f/doc/index.rst
@@ -76,6 +76,8 @@ features:
 +-----------+------------+-------------------------------------+
 | SPI(M)    | on-chip    | spi                                 |
 +-----------+------------+-------------------------------------+
+| ADC       | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
 
 The default configuration can be found in the defconfig file:
 ``boards/arm/twr_ke18f/twr_ke18f_defconfig``.

diff --git a/boards/arm/twr_ke18f/pinmux.c b/boards/arm/twr_ke18f/pinmux.c
@@ -111,6 +111,14 @@ static int twr_ke18f_pinmux_init(struct device *dev)
 #endif
 	pinmux_pin_set(portc, 15, PORT_PCR_MUX(kPORT_MuxAsGpio));
 
+#ifdef CONFIG_ADC_0
+	/* Thermistor A, B */
+	pinmux_pin_set(porta, 0, PORT_PCR_MUX(kPORT_PinDisabledOrAnalog));
+	pinmux_pin_set(porta, 1, PORT_PCR_MUX(kPORT_PinDisabledOrAnalog));
+	/* Potentiometer */
+	pinmux_pin_set(portc, 14, PORT_PCR_MUX(kPORT_PinDisabledOrAnalog));
+#endif
+
 	return 0;
 }
 

diff --git a/boards/arm/twr_ke18f/twr_ke18f.dts b/boards/arm/twr_ke18f/twr_ke18f.dts
@@ -141,6 +141,11 @@
 	status = "ok";
 };
 
+&adc0 {
+	status = "ok";
+	sample-time = <12>;
+};
+
 &flash0 {
 	/*
 	 * For more information, see:

diff --git a/boards/arm/twr_ke18f/twr_ke18f.yaml b/boards/arm/twr_ke18f/twr_ke18f.yaml
@@ -14,3 +14,4 @@ supported:
   - i2c
   - hwinfo
   - spi
+  - adc
-Original file line number
+Diff line change
@@ Expand Up / @@ -14,3 +14,4 @@ supported: @@
       - i2c
       - hwinfo
       - spi
+      - adc