Driver for AD7705/AD7706 SPI ADC

examples/ad770x/Makefile

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+PROGRAM = ad770x
+EXTRA_COMPONENTS = extras/ad770x
+#ESPBAUD = 460800
+include ../../common.mk

examples/ad770x/main.c

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+/*
+ * Example of using AD7705/AD7706 driver
+ *
+ * Part of esp-open-rtos
+ * Copyright (C) 2017 Ruslan V. Uss <unclerus@gmail.com>
+ * BSD Licensed as described in the file LICENSE
+ */
+#include <esp/uart.h>
+#include <espressif/esp_common.h>
+#include <stdio.h>
+#include <i2c/i2c.h>
+#include <ad770x/ad770x.h>
+#include <FreeRTOS.h>
+#include <task.h>
+
+#define CS_PIN 2
+#define AIN_CHANNEL 0 // AIN1+,AIN1- for AD7705
+
+static const ad770x_params_t dev = {
+    .cs_pin = CS_PIN,
+    .master_clock = AD770X_MCLK_4_9152MHz, // 4.9152 MHz
+    .bipolar = false,                      // Unipolar mode
+    .gain = AD770X_GAIN_1,                 // No gain
+    .update_rate = AD770X_RATE_50          // 50 Hz output update rate
+};
+
+void user_init(void)
+{
+    uart_set_baud(0, 115200);
+    printf("SDK version:%s\n", sdk_system_get_sdk_version());
+
+    while (ad770x_init(&dev, AIN_CHANNEL) != 0)
+    {
+        printf("Cannot initialize AD7705\n");
+        vTaskDelay(500 / portTICK_PERIOD_MS);
+    }
+
+    while (true)
+    {
+        // wait for data
+        while (!ad770x_data_ready(&dev, AIN_CHANNEL)) {}
+
+        // Read result
+        uint16_t raw = ad770x_raw_adc_value(&dev, AIN_CHANNEL);
+
+        printf("Raw ADC value: %d\n", raw);
+
+        vTaskDelay(500 / portTICK_PERIOD_MS);
+    }
+}