DeveloperWorld

@andycadams2011 As far as I know, yes.

Hi @ml

From your description it looks like the LDO (5V-> 4V) of IC5 is broken. According to the specification, the maximum voltage for this LDO is 6V.

It's possible that the USB power supply has exceeded 6V and the LDO has been damaged. Maybe you used an adapter or battery that doesn't properly comply with the USB-PD standard.

In the Spresense documentation you can find:
"Powering the Spresense board using a conversion adapter for USB Type-C AC adapter etc. to microB may result in a voltage exceeding the VBUS withstand voltage, which may destroy the Spresense board. (Conversion adapters with Type-C receptacle connectors are non-USB standard compliant)."
https://developer.sony.com/develop/spresense/docs/introduction_en.html#_powering_the_spresense_board

Additionally, please see block diagram:
https://developer.sony.com/develop/spresense/docs/images/block_diagram_mainboard.jpg

Best Regards,
Kamil Tomaszewski

Hi @andycadams2011

Unfortunately, I don't know how to help you. As far as I know the bus I/O access is serialized and cannot be multiplexed on Spresense.

I'll try to find out about it. If I find out anything new, I will let you know.

Best Regards,
Kamil Tomaszewski

Hi @tuan-nguyen

You can create a new task as I showed before. If you want more then you can create more as shown below:

task_create("led_thread0", 100, 2048, led_thread0, NULL);
task_create("led_thread1", 100, 2048, led_thread1, NULL);
task_create("led_thread2", 100, 2048, led_thread2, NULL);
...

Best Regards,
Kamil Tomaszewski

Hi @tuan-nguyen

You've probably followed this tutorial: https://developer.sony.com/develop/spresense/docs/arduino_tutorials_en.html#_tutorial_multicore

NuttX is also running on the sub cores. This allows you to use NuttX functions like task_create ().

Below is the code that controls the led in another task on sub core 1:

#if (SUBCORE != 1)
#error "Core selection is wrong!!"
#endif

#include <MP.h>
#include <time.h>

static uint64_t get_time() {
  struct timespec tp;

  clock_gettime(CLOCK_REALTIME, &tp);

  return (((uint64_t)tp.tv_sec) * 1000 + tp.tv_nsec / 1000000);
}

static int led_thread(int argc, FAR char *argv[])
{
  bool value = false;
  uint64_t t_time;
  uint64_t cur_time;

  t_time = get_time();

  while (1) {
    cur_time = get_time();
  
    if (cur_time >= t_time + 1000)
    {
      value = !value;
      digitalWrite(LED0, value);
      t_time = cur_time;
    }
  }

  return 0;
}

void setup()
{
  MP.begin();

  task_create("led_thread0", 100, 2048, led_thread, NULL);
}

void loop()
{
  delay(1000);

  MPLog("loop\n");
}

If you are using Arduino IDE then you don't need to install Spresense SDK. The Spresense SDK is already included with the Spresense Arduino libraries as an exported SDK.

I hope this answers your questions.

Best Regards,
Kamil Tomaszewski

Hi @tuan-nguyen

I would like to confirm whether you would like to use multithreading on one core or would you like to use multicore?

Could you also tell me what tutorial you have followed? The first link does not take me anywhere.

Best Regards,
Kamil Tomaszewski

Hi @ivan

Please see the code below. I have modified your code to make it easier for you to understand what I did. The solution is that the main core sends the address to the variables to the sub cores, so they have access to the same variable.

#include <MP.h>

typedef struct {
  bool *sub1_ended;
  bool *sub2_ended;
} sub_ended_t;

#if !SUBCORE

bool sub1_ended = TRUE; 
bool sub2_ended = TRUE; 

  // SETUP
  void setup(){ 
  // Boot SubCores
    int ret = 0;
    int subid;
    sub_ended_t sub_ended;
    sub_ended.sub1_ended = &sub1_ended;
    sub_ended.sub2_ended = &sub2_ended;
    for (subid = 1; subid <= 2; subid++) {
      ret = MP.begin(subid);
      if (ret < 0) {
        MPLog("MP.begin(%d) error = %d\n", subid, ret);
      }
      ret = MP.Send(0, &sub_ended, subid);
      if (ret < 0) {
        MPLog("MP.Send error = %d\n", ret);
      }
    }
  }

  void loop(){
    }

  
#elif (SUBCORE == 1)

bool *sub1_ended;
bool *sub2_ended;

  void setup(){
    int ret = 0;
    MP.begin();
    /* Timeout 1000 msec */
    MP.RecvTimeout(1000);
    uint8_t msgid;
    sub_ended_t *sub_ended;
  
    ret = MP.Recv(&msgid, &sub_ended);
    if (ret < 0) {
      printf("MP.Recv error = %d\n", ret);
    }
    sub1_ended = sub_ended->sub1_ended;
    sub2_ended = sub_ended->sub2_ended;
  }
  void loop(){
    if(*sub1_ended && *sub2_ended){
      delay(10);
      *sub1_ended = FALSE;
      // tasks...
      digitalWrite(LED0,HIGH);
      delay(1000);
      digitalWrite(LED0,LOW);
      delay(1000);
      *sub1_ended = TRUE;
    }
  }


#elif (SUBCORE == 2)

bool *sub1_ended;
bool *sub2_ended;

  void setup(){
    int ret = 0;
    MP.begin();
    /* Timeout 1000 msec */
    MP.RecvTimeout(1000);
    uint8_t msgid;
    sub_ended_t *sub_ended;
  
    ret = MP.Recv(&msgid, &sub_ended);
    if (ret < 0) {
      printf("MP.Recv error = %d\n", ret);
    }
    sub1_ended = sub_ended->sub1_ended;
    sub2_ended = sub_ended->sub2_ended;
  }
  void loop(){
    if(*sub1_ended && *sub2_ended){
      delay(10);
      *sub2_ended = FALSE;
      // tasks...
      digitalWrite(LED1,HIGH);
      delay(2000);
      digitalWrite(LED1,LOW);
      delay(2000);
      *sub2_ended = TRUE;
    }
  }
  
#endif 

I hope it will help.

Best Regards,
Kamil Tomaszewski

@andycadams2011 Could you please try to check the status link at the end of the application? After the connection is established.

@andycadams2011 According to chapter 4.1.18 this is the correct link status checking: http://wizwiki.net/wiki/lib/exe/fetch.php/products:w6100:w6100_ds_v104e.pdf

Could you please try unplugging the cable and see what the return value will be? Also 6?

@andycadams2011 What operating voltage of the GPIO pin sockets are you using: https://developer.sony.com/develop/spresense/docs/hw_docs_en.html#_setting_operating_voltage?