I tried several pin conifguration to connect nodemcu and micro sd card. However, I had not any luck to successfully connect to sd card. I followed esp8266 forum and some other solution! I need your suggestions :)
The pin mapping that SD card attached to SPI bus as follows:
MicroSD => ESP8266
MOSI(DI) -> D7 (GPIO13) HMOSI
MISO(DO) -> D6 (GPIO12) HMISO
CLK -> D5 (GPIO14) HSCLK
CS -> D2 (GPIO4)
VDD -> Vin/3V3
GND -> GND
All other pin that available in microsd will not need to use!
After connecting all pin, you can test one of the example that given in by default. For example, In Arduino IDE you can use this example, File -> Examples -> 8266(SD) -> CardInfo
CONNECT SDCARD NODEMCU - TESTED
CS - D8
MISO - D7
MOSI - D6
SCK - D5
In Arduino IDE open FILE > EXAMPLES > SD > CARDINFO
Change
const int chipSelect = 15; // original code is 4
That's it, your SD Card will be working.
This works, just tested on my breadboard.
Related
I am trying to get a very simple ESP8266 project to work but I keep failing and have no clue why.
These are my components:
Wemos D1 (ESP8266MOD)
WS2812B 5050 LED Stripe (2m with 60 LEDs/m)
5V 10A DC Power Supply
This is how I connected everything (I also tried multiple other pins on the controller)
Then I uploaded this code to the controller:
#include <Arduino.h>
#include <Adafruit_NeoPixel.h>
#define PIN D2
#define NUMPIXELS 20
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
int delayval = 500;
void setup() {
pixels.begin();
}
void loop() {
pixels.clear();
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(0,150,0));
pixels.show();
delay(delayval);
}
}
Absolutely nothing happens. The LEDs remain dark.
I measured the voltage directly on the strip connectors and it's fine. I've got no oszilloscope, but I get varying voltages on the ESPs data pin, so I suppose that's also working as expected.
I also stumbled upon this article stating that the signal voltage has to be at least 60% of the voltage of the stripe while my controller works with 3.3V (seee Datasheet). So I thought this might be part of the problem and tried it again wiht another power supply providing araound 3.8V at max. 5A with the same result. I am running out of ideas. Maybe you have got some for me.
I am working with the Songhe Mega2560 + WiFi R3 Mega2560 + ESP8266 4MB Memory integrated circuit for a project involving connecting to a WiFi signal and reading the RSSI value.
Below is a basic sketch that I uploaded to the Mega2560 to communicate to the ESP8266 through Serial3 to test the firmware:
#include "WiFiEsp.h"
// Emulate Serial3 on pins 6/7 if not present
#ifndef HAVE_HWSERIAL3
#include "SoftwareSerial.h"
SoftwareSerial Serial3(6, 7); // RX, TX
#endif
void setup() {
// initialize serial for debugging
Serial.begin(115200);
// initialize serial for ESP module
Serial3.begin(115200);
// initialize ESP module
WiFi.init(&Serial3);
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}
// Print WiFi MAC address
printMacAddress();
}
void loop() {
// do nothing
}
I flashed different versions of espressif's AT firmware but the serial monitor keeps showing this:
22:28:07.009 -> [WiFiEsp] Initializing ESP module
22:28:08.023 -> [WiFiEsp] >>> TIMEOUT >>>
22:28:10.026 -> [WiFiEsp] >>> TIMEOUT >>>
22:28:12.022 -> [WiFiEsp] >>> TIMEOUT >>>
22:28:14.023 -> [WiFiEsp] >>> TIMEOUT >>>
22:28:16.020 -> [WiFiEsp] >>> TIMEOUT >>>
22:28:17.006 -> [WiFiEsp] Cannot initialize ESP module
22:28:23.017 -> [WiFiEsp] >>> TIMEOUT >>>
22:28:23.017 -> [WiFiEsp] No tag found
22:28:23.017 -> WiFi shield not present
I am not sure if it is a firmware issue so I have tried multiple versions of AT firmware. The baud rate I have set is 115200. I have been looking at many other sources online, but I cannot seem to initialize WiFiEsp's WiFi module and I would really appreciate some help on this matter.
I have been following these steps for flashing and testing.
Toggle DIP switches 5,6,7 to ON and all else OFF and RXD/TXD to RXD0
Connect USB cable from port COM3 (on my computer) to integrated PCB with Mega2560 + ESP8266 WiFi
Use esptool.py to flash firmware to the ESP8266
The latest, released firmware for ESP8266 is the "ESP8266-IDF-AT_V2.2.1.0.zip" downloadable at espressif.com
I download the factory_xxx.bin to address 0 since I read that it indicates all hardware configurations for the ESP module. Below is the command I ran:
esptool.py --chip auto --port COM3 --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_size 4MB 0x0 factory_WROOM-02.bin
Disconnect USB cable
Toggle DIP switches 1,2,3,4 to ON and all else OFF and RXD/TXD to RXD3
Connect USB cable and upload sketch with Arduino IDE and read serial monitor
This is the procedure I have been trying to debug. If anymore information is required for better help, please let me know and I will try my best to provide.
The screenshot below is the command I run which successfully flashes (I think):
C:\Users\[MY NAME]\Downloads\ESP8266_NONOS_SDK-3.0.5\ESP8266_NONOS_SDK-3.0.5\bin>esptool.py write_flash --flash_mode dout --flash_size 4MB-c1 0x0 boot_v1.7.bin 0x01000 at/1024+1024/user1.2048.new.5.bin 0x1fb000 blank.bin 0x1fc000 esp_init_data_default_v08.bin 0xfe000 blank.bin 0x1fe000 blank.bin
esptool.py v4.4
Found 1 serial ports
Serial port COM3
Connecting....
Detecting chip type... Unsupported detection protocol, switching and trying again...
Connecting....
Detecting chip type... ESP8266
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: a4:e5:7c:b6:77:c0
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Flash will be erased from 0x00000000 to 0x00000fff...
Flash will be erased from 0x00001000 to 0x00065fff...
Flash will be erased from 0x001fb000 to 0x001fbfff...
Flash will be erased from 0x001fc000 to 0x001fcfff...
Flash will be erased from 0x000fe000 to 0x000fefff...
Flash will be erased from 0x001fe000 to 0x001fefff...
Flash params set to 0x0360
Compressed 4080 bytes to 2936...
Wrote 4080 bytes (2936 compressed) at 0x00000000 in 0.4 seconds (effective 92.5 kbit/s)...
Hash of data verified.
Compressed 413556 bytes to 296987...
Wrote 413556 bytes (296987 compressed) at 0x00001000 in 26.2 seconds (effective 126.1 kbit/s)...
Hash of data verified.
Compressed 4096 bytes to 26...
Wrote 4096 bytes (26 compressed) at 0x001fb000 in 0.1 seconds (effective 373.3 kbit/s)...
Hash of data verified.
Compressed 128 bytes to 75...
Wrote 128 bytes (75 compressed) at 0x001fc000 in 0.1 seconds (effective 11.8 kbit/s)...
Hash of data verified.
Compressed 4096 bytes to 26...
Wrote 4096 bytes (26 compressed) at 0x000fe000 in 0.1 seconds (effective 365.1 kbit/s)...
Hash of data verified.
Compressed 4096 bytes to 26...
Wrote 4096 bytes (26 compressed) at 0x001fe000 in 0.1 seconds (effective 357.1 kbit/s)...
Hash of data verified.
Leaving...
Hard resetting via RTS pin...
After this, I test it with Arduino's SerialPassThrough sketch replacing Serial1 with Serial3 and I get no response from running the command: AT.
I would appreciate any help on how to resolve this and where I could possibly be going wrong. Thanks!
I have this LCD panel:
LED panel's backlight is driven by the MIC2297 chip which takes two signals:
BRT - PWM signal for setting brightness of the LCD's background LEDs.
BL_EN that - gpio signal that enables or disables the LCD's background LEDs.
MIC2297 is powered from the +12V.
Now I connected this display to the Beaglebone Black's (BBB's) expansion connector and I am already running Linux on the BBB's microcontroller AM335x.
In order to enable the backlight I have to properly define it in the device tree i.e. .dts file. Currently I managed to set this up:
backlightt: backlight {
compatible = "pwm-backlight";
pwms = <&ehrpwm1 0 500000000>;
power-supply <>; // ???
enable-gpios = <&gpio2 3 0>;
brightness-levels = <0 4 8 16 32 64 128 255>;
default-brightness-level = <7>;
};
What I don't understand is the property power-supply. How can I know which regulator to use? My devicce uses external 12V! This is really confusing! Why do we even have to specify the regulator?
I found solution...
PWM backlight requires a property "power-supply" that points to some regulator inside the AM335x. This regulator is used to set the output voltage of the PWM - so we don't need to put any kind of voltage regulator between an AM335x and the backlight IC (which might only support 1.5V PWM input on some mobile devices). This is actually really useful.
Can I program the ESP8266 module via USBasp V2.0 and Arduino IDE, or do I need to get a different kind of programming stick?
Here're the pins of the USBasp:
The ESP8266 has the rolling pin setup:
My current setup: USBasp (left) --- ESP8266 (right)
Pin2 - VCC --- (3.3V) VCC
Pin4 - TXD --- Pin TX
Pin6 - RXD --- Pin RX
All remaining ESP8266 pins go to ground on the USBasp.
When connecting to my Mac and starting Arduino IDE, the USBasp board and the ESP8266 LEDs light up.
Problem:
The USBasp does not show up in the Port section. Whenever I'm trying to upload a sketch these errors show up:
error: espcomm_open failed
error: espcomm_upload_mem failed
Questions:
Can I flash an ESP8266 with a USBasp V2.0
Is the setup correct?
You need to switch rx an tx pins on one side. Then you need to pull CH_PD pin on the ESP to VCC and when you upload to the ESP you need to pull GPIO0 to GND before you apply power.
Pin2 - VCC --- (3.3V) VCC
Pin2 - VCC --- CH_PD
Pin4 - TXD --- Pin RX
Pin6 - RXD --- Pin TX
Pin8 - GND --- GPIO 0 (only when programming)
Leave ESP RESET pin floating
Then the last thing. It looks like the USBasp are 5v so you would need another power supply for the ESP witch is 3.3v.
I am working with a Beaglebone Black and I would like to use the mmc2 slot.
according to AM335xx TRM, a beaglebone black should have 3 mmc available:
mmc0 (sd card);
mmc1 (2G flash),
mmc2.
I am trying to enable mmc2 by device tree (and I am quite sure to have the right pin settings) but, by doing
dmesg
I obtain:
/ocp/mmc#47810000: can't find DMA channel
omap_hsmmc mmc.11: unable to obtain RX DMA engine channel 65
By putting the oscilloscope probe on the header (e.g. the mmc2 clk signal), I do not see any transition.
I already removed R 160 to have mmc2 cmd accessible but I do not see any transition also there.
I tried both to enable it by
echo > /sys/devices/..../slots
and by
capemgr.enable_partno
with no success:
I can see it in
/sys/devices/..../slots
(with the L meaning loaded)..but no way to see any signal on the header.
I already googled it but answers are not clear at all.
Any ideas?
My
uname -a
is:
Linux beaglebone 3.8.13 #1 SMP Tue Jun 18 02:11:09 EDT 2013 armv7l GNU/Linux
Thanks for your help.
You need to configure the mmc2 DMA events to some DMA channel since these events are not direct mapped.
I was not able to do this successfully using device tree overlays. So I made a change in the
am335-x-bone-common.dtsi directly (not sure this is the best way though):
&edma {
ti,edma-xbar-event-map = <32 12>, /* gpevt2 -> 12 */
<30 20>, /* xdma_event_intr2 -> 20 */
+ <1 32>,
+ <2 33>;
};
In the example above the event 1 (SDTXEVT2) was mapped to channel 32 and event 2 (SDRXEVT2) to channel 33.
In case you want to pick another open DMA channel check tables 11-23. Direct Mapped and Table 11-24. Crossbar Mapped from the technical reference manual Rev J.
In your device tree overlay file add these channels in the mmc3 node:
dmas = <&edma 32
&edma 33>;
dma-names = "tx", "rx";