MAX7219/MAX7221 dirver + example

examples/max7219_7seg/Makefile

@@ -0,0 +1,3 @@
+PROGRAM = max7219_7seg
+EXTRA_COMPONENTS = extras/max7219
+include ../../common.mk

examples/max7219_7seg/main.c

@@ -0,0 +1,52 @@
+/*
+ * Example of using MAX7219 driver with 7 segment displays
+ *
+ * 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 <max7219/max7219.h>
+#include <FreeRTOS.h>
+#include <task.h>
+#include <stdio.h>
+#include <esp/hwrand.h>
+
+#define CS_PIN 5
+#define DELAY 2000
+
+static max7219_display_t disp = {
+    .cs_pin       = CS_PIN,
+    .digits       = 8,
+    .cascade_size = 1,
+    .mirrored     = true
+};
+
+void user_init(void)
+{
+    uart_set_baud(0, 115200);
+    printf("SDK version:%s\n", sdk_system_get_sdk_version());
+
+    max7219_init(&disp);
+    //max7219_set_decode_mode(&disp, true);
+
+    char buf[9];
+    while (true)
+    {
+        max7219_clear(&disp);
+        max7219_draw_text(&disp, 0, "7219LEDS");
+        vTaskDelay(DELAY / portTICK_PERIOD_MS);
+
+        max7219_clear(&disp);
+        sprintf(buf, "%2.4f A", 34.6782);
+        max7219_draw_text(&disp, 0, buf);
+        vTaskDelay(DELAY / portTICK_PERIOD_MS);
+
+        max7219_clear(&disp);
+        sprintf(buf, "%08x", hwrand());
+        max7219_draw_text(&disp, 0, buf);
+        vTaskDelay(DELAY / portTICK_PERIOD_MS);
+    }
+}