Artemis RedBoard - digitalWrite works, analogWrite doesn't

Development Boards Artemis
1

The following digital calls work, but the analog calls don’t. The voltage on the pin remains 0v with the analog calls. Do I need to configure the pins more than I’ve shown below? TY

Works:

digitalWrite(9, HIGH);

digitalWrite(8, LOW);

The following doesn’t work (but does work on an UNO RedBoard):

pinMode(9, OUTPUT);

pinMode(8, OUTPUT);

analogWrite(9, 255);

analogWrite(8, 0);

2

Note: I used pins 6 and 5 on the UNO RedBoard since they were both PWM. I’ve tried 6 and 5 on the Artemis RedBoard too with no luck.

3

Also of note, the Redboard Artemis Apollo3 example AnalogWrite doesn’t “breathe” the LED. It also does nothing.

4

What core are you using? You might try 1.2.1 if you can get it to work.

5

I have the same issue on the board I just ordered. Did this get resolved?

6

I’m having the same issue using core version 2.0.2. I can’t go back because I’m trying to incorporate BLE also. Any suggestions?

7

what BLE communication do you need? I have ported the BLE from 1.xx to 1.2.X. I am still puzzled why that has been removed. I have instruction to install the exactle-BLE stack (these days known as Cordio) to the 1.2.1 to receive and sent data. I have the limits (as I wanted to keep it very simple) are MAX 20 bytes and no handshake (scaled down version of AMDTP… but then MUCH easier)

8

It has now been a month with no response from SparkFun.

9

I am NOT Sparkfun, but trying to help. There a number of pads that can be used for Analogwrite (which is actually turned to PWM output). Pins 8 and 9 are not part of that. Look at the Apollo3 datasheet, table 585. All those with CTx are able to be used. Just to point the PAD out here.: 12,25,13,26,18,27,19,28,5,29,6,30,22,31,23,32,42,4,43,7,44,24,45,33,46,39,47,35,48,37,49,11

I have used an ATP board and used the following example with a led + 1K.

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  Serial.println("starting\n");
  
  pinMode(29, OUTPUT);
  analogWrite(29, 0);
}

void loop() {
  uint8_t i;
  for (i = 0 ; i < 255 ; i++){
    delay(10);
    analogWrite(29, i);
  }

  for (; i > 0 ; i--){
    delay(10);
    analogWrite(29, i);
  }
}
10

Thanks! I’ll give that a shot!

11

I am able to get the Arduino built-in example under the analog heading called Fading (Examples\Analog\Fading) to work on my Artemis Nano, but the example from the Apollo3/AnalogWrite does not work. I am using LED_BUILTIN as the pin callout for both programs.

12

For the artemis redboard nano and core 2.0.3 you must change two files in the core:

  • To get Serial.print to work you need to:

  • Variant = core directory + SparkFun/hardware/apollo3/2.03/variants/SFE_ARTEMIS_NANO

  • ** Variant/variant.cpp: Needs to comment line = //UART Serial1(SERIAL1_TX, SERIAL1_RX);

  • ** Variant/config/pins.cpp: Needs to be changed to to get anolog and digitalWrite to work

#include “bridge/pins.h”

const pin_size_t variantPinCount = 18;

PinState variantPinStates[variantPinCount] = {

{A0, 13, NULL, NULL},

{A1, 33, NULL, NULL},

{A2, 11, NULL, NULL},

{A3, 29, NULL, NULL},

{D4, 18, NULL, NULL},

{A5, 31, NULL, NULL},

{D6, 43, NULL, NULL},

{D7, 42, NULL, NULL},

{D8, 38, NULL, NULL},

{D9, 39, NULL, NULL},

{D10, 40, NULL, NULL},

{D11, 5, NULL, NULL},

{D12, 7, NULL, NULL},

{D13, 8, NULL, NULL},

{A14, 35, NULL, NULL},

{A15, 32, NULL, NULL},

{A16, 12, NULL, NULL},

{LED1, 19, NULL, NULL},

};

Pins need to be referred to as D12 (not just 12) or A14 in your code.

pwm (analogWrite) works A0,A1,A2,A3,D4,A5,D6,D7,D8=NO,D9,D10=NO,D11,D12

,D13=NO,A14,A15,A16

digitalWrite works on all pins but may be a problem around D10-D14

(haven’t had time to verify digitalWrite yet)

13

Thank you!

14

oops…sorry, D13 should be pad 6 not 8

15

Yeah, still no go for the base RedBoard Artemis on 2.0.3. I can call digitalWrite on LED_BUILTIN and blink the LED, but analogWrite on LED_BUILTIN does nothing using the examples.