From 5b77bcca71207099143c055a56fe8dd4c0076ecd Mon Sep 17 00:00:00 2001
From: Peter Hart <cinphart@gmail.com>
Date: Mon, 14 Sep 2020 08:09:48 -0400
Subject: [PATCH] Add flashing notes.

---
 notes.org | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/notes.org b/notes.org
index 25fc6cb..3cd68c3 100644
--- a/notes.org
+++ b/notes.org
@@ -1,6 +1,32 @@
 
 #+TITLE: MicroPython Implementation Notes
 
+* Backup Up firmware, flashing, etc.
+
+On lolin32, need to hold down the reset while esptool is connecting,
+and then release to get this to work.
+
+** Backup existing firmware from 4M Flash ESP32
+#+BEGIN_SRC bash
+esptool.py -b 115200 --port /dev/ttyUSB0 read_flash 0x00000 0x400000 lolin32_original.bin
+#+END_SRC
+
+** Update Flash from backup
+#+BEGIN_SRC bash
+esptool.py -b 115200 --port /dev/ttyUSB0 write_flash --flash_freq 80m 0x000000 lolin32_original.bin
+#+END_SRC
+
+** Erase Flash
+#+BEGIN_SRC bash
+esptool.py -b115200  --port /dev/ttyUSB0 erase_flash
+#+END_SRC
+
+** Flash with MicroPython
+
+#+BEGIN_SRC bash
+esptool.py --chip esp32 --port /dev/ttyUSB0 write_flash -z 0x1000 ~/Downloads/esp32-idf3-20200902-v1.13.bin
+#+END_SRC
+
 
 * Circuit Layout
 
@@ -50,7 +76,7 @@ from machine import Pin
 vext = Pin(21, Pin.OUT, Pin.PULL_HOLD)
 vext.value(0) # Turns ON Vext
 vext.value(1) # Turns OFF Vext
-machine.deep_sleep()
+machine.deepsleep()
 #+END_SRC
 
 * Wifi Connection Example, outbound requests.