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doc/display_c.txt

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+// display.c
+
+/*
+ * Copyright (c) 2014-2017 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#include <Arduino.h>
+#include <Adafruit_SSD1306.h>
+
+#include "common/cs_dbg.h"
+#include "fw/src/mgos_app.h"
+#include "fw/src/mgos_timers.h"
+
+Adafruit_SSD1306 *d1 = nullptr, *d2 = nullptr;
+
+static void timer_cb(void *arg);
+
+void setup(void) {
+  // I2C
+  d1 = new Adafruit_SSD1306(4 /* RST GPIO */, Adafruit_SSD1306::RES_128_64);
+
+  if (d1 != nullptr) {
+    d1->begin(SSD1306_SWITCHCAPVCC, 0x3D, true /* reset */);
+    d1->display();
+  }
+
+  // SPI.
+  // On ESP8266 SPI and I2C cannot be enabled at the same time by default
+  // because their pins overlap.
+  // You will need to disable I2C and enable SPI:
+  // mos config-set i2c.enable=false spi.enable=true
+  d2 = new Adafruit_SSD1306(21 /* DC */, 5 /* RST */, 17 /* CS */,
+                            Adafruit_SSD1306::RES_128_32);
+
+  if (d2 != nullptr) {
+    d2->begin(SSD1306_SWITCHCAPVCC, 0 /* unused */, true /* reset */);
+    d2->display();
+  }
+
+  mgos_set_timer(1000 /* ms */, true /* repeat */, timer_cb, NULL);
+}
+
+static void show_num(Adafruit_SSD1306 *d, const char *s, int i) {
+  d->clearDisplay();
+  d->setTextSize(2);
+  d->setTextColor(WHITE);
+  d->setCursor(d->width() / 4, d->height() / 4);
+  d->printf("%s%d", s, i);
+  d->display();
+}
+
+static void timer_cb(void *arg) {
+  static int i = 0, j = 0;
+  if (d1 != nullptr) show_num(d1, "i = ", i);
+  if (d2 != nullptr) show_num(d2, "j = ", j);
+  LOG(LL_INFO, ("i = %d, j = %d", i, j));
+  i++;
+  j++;
+  (void) arg;
+}
+
+#if 0
+void loop(void) {
+  /* For now, do not use delay() inside loop, use timers instead. */
+}
+#endif
+
+
+#if 0
+#include <stdio.h>
+
+#include "common/cs_dbg.h"
+#include "fw/src/mgos_app.h"
+#include "fw/src/mgos_i2c.h"
+#include "fw/src/mgos_mongoose.h"
+#include "fw/src/mgos_utils.h"
+
+static struct mgos_i2c *uOLED_i2c;
+
+static uint8_t from_hex(const char *s) {
+#define HEXTOI(x) (x >= '0' && x <= '9' ? x - '0' : x - 'W')
+  int a = tolower(*(const unsigned char *) s);
+  int b = tolower(*(const unsigned char *) (s + 1));
+  return (HEXTOI(a) << 4) | HEXTOI(b);
+}
+
+enum mgos_app_init_result uOLED_i2cSetup() {
+	struct sys_config_i2c *cfg;
+
+	uOLED_i2c = mgos_i2c_create(const struct sys_config_i2c *cfg);
+	return MGOS_APP_INIT_SUCCESS;
+}
+
+void uOLED_send_hexstring(struct mg_str *s) {
+	bool ret = false;
+	LOG(LL_INFO, ("Got: [%.*s]", (int) s->len, s->p));
+	if (s->len >= 2) {
+	  int j = 0;
+	  // struct mgos_i2c *i2c = mgos_i2c_get_global();
+	  for (size_t i = 0; i < s->len; i += 2, j++) {
+	    ((uint8_t *) s->p)[j] = from_hex(s->p + i);
+	  }
+	  ret = mgos_i2c_write(uOLED_i2c, s->p[0], s->p + 1, j, true /* stop */);
+	}
+}
+
+/** \brief  Write a byte over I2C
+	Write a byte to I2C device _address_. The DC byte determines whether
+	the data being sent is a command or display data. Use either I2C_COMMAND
+	or I2C_DATA in that parameter. The data byte can be any 8-bit value.
+**/
+void uOLED_i2cWrite(byte address, byte dc, byte data)
+{
+	Wire.beginTransmission(address);
+	Wire.write(dc); // If data dc = 0, if command dc = 0x40
+	Wire.write(data);
+	Wire.endTransmission();
+}
+
+#endif