Update repo

apps/04_adc_pa1_pa4_pb0_poll/CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.20.0)
+
+# Locate the Zephyr build system as a CMake package
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+# Project name
+project(adc_multichannel)
+
+# Add source files belong to this application
+target_sources(app PRIVATE src/main.c)

apps/04_adc_pa1_pa4_pb0_poll/boards/nucleo_f767zi.overlay

@@ -0,0 +1,33 @@
+/ {
+    aliases {
+        led0 = &red_led;
+        led1 = &blue_led;
+        led2 = &green_led;
+		sw0 = &user_button0;
+    };
+	
+	gpio_keys {
+		compatible = "gpio-keys";
+		
+		user_button0: button {
+			label = "Button";
+			gpios = <&gpioc 13 GPIO_ACTIVE_HIGH>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+};
+
+&adc1{
+    pinctrl-0 = <&adc1_in1_pa1 &adc1_in4_pa4 &adc1_in8_pb0>;
+    pinctrl-names = "default";
+	st,adc-prescaler = <4>;
+	status = "okay";
+};
+
+/*---Uncomment this block ONLY if your build complains the labels are undeclared---
+&pinctrl{
+    adc1_in1_pa1: adc1_in1_pa1 { pinmux = <STM32_PINMUX('A', 1, ANALOG)>; }
+    adc1_in4_pa4: adc1_in4_pa4 { pinmux = <STM32_PINMUX('A', 4, ANALOG)>; }
+    adc1_in8_pb0: adc1_in8_pb0 { pinmux = <STM32_PINMUX('B', 0, ANALOG)>; }
+}
+*/

apps/04_adc_pa1_pa4_pb0_poll/boards/stm32f4_disco.overlay

@@ -0,0 +1,24 @@
+/ {
+    aliases {
+        led0 = &red_led_5;
+        led1 = &blue_led_6;
+        led2 = &green_led_4;
+        led3 = &orange_led_3;
+		sw0 = &user_button;
+    };
+};
+
+&adc1{
+    pinctrl-0 = <&adc1_in1_pa1 &adc1_in4_pa4 &adc1_in8_pb0>;
+    pinctrl-names = "default";
+	st,adc-prescaler = <4>;
+	status = "okay";
+};
+
+/*---Uncomment this block ONLY if your build complains the labels are undeclared---
+&pinctrl{
+    adc1_in1_pa1: adc1_in1_pa1 { pinmux = <STM32_PINMUX('A', 1, ANALOG)>; }
+    adc1_in4_pa4: adc1_in4_pa4 { pinmux = <STM32_PINMUX('A', 4, ANALOG)>; }
+    adc1_in8_pb0: adc1_in8_pb0 { pinmux = <STM32_PINMUX('B', 0, ANALOG)>; }
+}
+*/

apps/04_adc_pa1_pa4_pb0_poll/prj.conf

@@ -0,0 +1,6 @@
+CONFIG_GPIO=y
+CONFIG_SERIAL=y
+CONFIG_ADC=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_CONSOLE=y
+CONFIG_PRINTK=y

apps/04_adc_pa1_pa4_pb0_poll/src/main.c

@@ -0,0 +1,107 @@
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/sys/printk.h>
+#include <zephyr/drivers/gpio.h>
+#include <zephyr/drivers/uart.h>
+#include <zephyr/drivers/adc.h>
+
+
+#define ADC_NODE DT_NODELABEL(adc1)
+
+#if !DT_NODE_HAS_STATUS(ADC_NODE, okay)
+#error "ADC1 not available; Enable it in a board overlay if needed."
+#endif
+
+static const struct device *const adc_dev = 
+	DEVICE_DT_GET(ADC_NODE);
+
+static uint16_t sample;
+
+// Channels Configuration: PA1(IN1), PA4(IN4), PB0(IN8)
+
+static struct adc_channel_cfg ch1_cfg = {
+    .gain             = ADC_GAIN_1,
+    .reference        = ADC_REF_INTERNAL,
+    .acquisition_time = ADC_ACQ_TIME_DEFAULT,
+    .channel_id       = 1,
+    .differential     = 0,
+};
+
+static struct adc_channel_cfg ch4_cfg = {
+    .gain             = ADC_GAIN_1,
+    .reference        = ADC_REF_INTERNAL,
+    .acquisition_time = ADC_ACQ_TIME_DEFAULT,
+    .channel_id       = 4,
+    .differential     = 0,
+};
+
+static struct adc_channel_cfg ch8_cfg = {
+    .gain             = ADC_GAIN_1,
+    .reference        = ADC_REF_INTERNAL,
+    .acquisition_time = ADC_ACQ_TIME_DEFAULT,
+    .channel_id       = 8,
+    .differential     = 0,
+};
+
+// A reusable sequence object for "one channel per read"
+static struct adc_sequence seq = {
+    .channels    = 0,  // Zero for now, we will update before we read
+    .buffer      = &sample,
+    .buffer_size = sizeof(sample),
+    .resolution  = 12, // 12-bit
+};
+
+static int read_one(uint8_t ch, uint16_t *out) {
+
+    // Set the channel to read
+    seq.channels = BIT(ch);
+    
+    // Read channel
+    int rc = adc_read(adc_dev, &seq);
+
+    // If read is successful store value in 'out'
+    if(rc == 0) {
+        *out = sample;
+    }
+
+    return rc;
+
+}
+
+
+int main(void)
+{
+    if(!device_is_ready(adc_dev)) {
+        return 0;
+    }
+
+    // Configure the channels
+    if(adc_channel_setup(adc_dev, &ch1_cfg) ||
+       adc_channel_setup(adc_dev, &ch4_cfg) ||
+       adc_channel_setup(adc_dev, &ch8_cfg)) {
+        return 0;
+    }
+
+    printk("\r\n[ADC Multichannel] PA1, PA4, PB0\r\n");
+
+	while (1) {
+
+        uint16_t v1 = 0, v4 = 0, v8 = 0;
+        int rc1 = read_one(1, &v1);
+        int rc4 = read_one(4, &v4);
+        int rc8 = read_one(8, &v8);
+
+        if(rc1 == 0 && rc4 == 0 && rc8 == 0) {
+            printk("Sensor1 = %u, Sensor4 = %u, Sensor8 = %u \r\n", v1, v4, v8);
+        }
+        else {
+            printk("ADC Read: Ch1 = %d, Ch4 = %d, Ch8 = %d \r\n", rc1, rc4, rc8);
+        }
+
+		k_sleep(K_MSEC(50));
+
+	}
+
+	return 0;
+}