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Development => Calculators => Calc Projects, Programming & Tutorials => Topic started by: TurtleForGaming on January 20, 2018, 01:44:33 pm

Title: TI Nspire uart
Post by: TurtleForGaming on January 20, 2018, 01:44:33 pm
So for around 2month now I'm developping an bluetooth interface (via UART) to the TI-Nspire. For that I use ndless and nspire-io (a bit modified to not lock the calc while waiting for message and echo remove). But for the past day I'm encoutering a little problem:  when i send a message to the calc (with or without bluetooth) I only get 32chars for exemple if I send:

Quote%%|NUMS|10|TestA|TestB|TestC|TestD|TestE|TestF|TestG|TestH|TestI|TestJ

I will only get
Quote%%|NUMS|10|TestA|TestB|TestC|Tes


which is a big problem for me and I don't really know why it append.

Here is my code:
#include <os.h>
#include <nspireio/uart.hpp>
#include <nspireio/console.hpp>

int key_already_pressed_ctrl = 0;
int key_already_pressed_contact = 0;
char* contact = "%%|NUMS|6|Name1|Name2|Name3|Name4|Name6|Name7";
int hasSelectedContact = 0;

// Modidification of the uart_getsn() function to remove the echo.


char* uart_getsn_mdf(char* str, int num) {
for(int i = 0; i < num-1; i++){
if(uart_ready()) {
char c = uart_getchar();
str[i] = c;
if(c == '\b'){ i -= 2; }
else if(c == '\r') { str[i] =0; return str; }
}
}
str[num] = 0;
return str;
}

char* uart_gets_mdf(char* str)
{
        return uart_getsn_mdf(str,50);
}

int numberOfCharsInArray(char* array) {
  return strlen(array);
}

int main(void)
{
//Write the program title
assert_ndless_rev(874);
nio_console csl;
nio_init(&csl,NIO_MAX_COLS,NIO_MAX_ROWS,0,0,NIO_COLOR_WHITE,NIO_COLOR_BLACK,TRUE);
nio_set_default(&csl);
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
nio_printf("               Nspire UART Chat by Samy.             ");
nio_printf("         Compiled the %s At %s        ",__DATE__,__TIME__);
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_LIGHTRED);
nio_printf("      Press  ESC key to exit and CTRL to send msg.    ");
nio_printf("                                                    ");
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
nio_puts("");

//Send that we are online
uart_printf("#$#CALC:ENTERING:SMS\r\n");

//Main loop
while(!isKeyPressed(KEY_NSPIRE_ESC)){
if(isKeyPressed(KEY_NSPIRE_CTRL) && !key_already_pressed_ctrl && !key_already_pressed_contact){
if(hasSelectedContact) {
nio_printf("<< ");
char output[90] = {0};
nio_getsn(output,90);
uart_printf("$#$SMS:");
int num = numberOfCharsInArray(output);
for(char* it = output; *it; ++it) {
uart_printf("%c",*it);
sleep(100);
}
uart_printf("\r\n");
} else {
nio_printf("You must select an contact !\r\n");
}
key_already_pressed_ctrl = 1;
}
if(isKeyPressed(KEY_NSPIRE_C) && !key_already_pressed_contact && !key_already_pressed_ctrl){
// START Contact select part
nio_clear(&csl);
//Title
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
nio_printf("                        Contact                      ");
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
//Search
nio_printf("Name search: ");
char output[90] = {0};
nio_getsn(output,90);
uart_printf("$#$UPDATENUM:%s\r\n",output);

nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
nio_clear(&csl);
while(!uart_ready() && !isKeyPressed(KEY_NSPIRE_ESC)) {
nio_printf("                        Waiting                      ");
sleep(500);
}
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
nio_printf("                        Contact                      ");
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
nio_clear(&csl);

char input[1024] = {0};
//sleep(500);
uart_getsn_mdf(input,1024);

nio_puts(input);
nio_puts("Select your contact:");

contact = input;

        char* namestable[1024];
        char* s;
        int i=0;
        s = strtok(contact ,"|");
        while (s != NULL) {
        if(i>1) {
namestable[i] = s;
}
        if(i>2) {
        nio_printf("  %i) %s. \r\n",i-3,s);
                }
                s = strtok (NULL, "|");
                i++;
        }
        nio_printf("Change contact to (n)?");
        char selected[10] = {0};
        nio_getsn(selected,10);
        int ii = atoi(selected);
ii=ii+3;
        if(ii >= 0 && namestable[ii] != "None") {
                nio_printf("Changing send contact to %s. \r\n",namestable[ii]);
uart_printf("$#$CHANGENUM:%s\r\n",namestable[ii]);
hasSelectedContact = 1;
nio_clear(&csl);
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
// Display reponsive title
nio_printf(" Info: Now chating with: %s \r\n", namestable[ii]);
nio_printf("                                                     ");
nio_puts("");
        } else {
hasSelectedContact = 0;
nio_clear(&csl);
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_LIGHTRED);
nio_printf("                                                     ");
nio_printf("  Error: Error while selecting contact please retry. ");
nio_printf("          If the error persist contact samy :)       ");
nio_printf("                                                     ");
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
nio_puts("");
        }
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
        // END Contact select part
key_already_pressed_contact = 1;
}
if(!any_key_pressed()) {
key_already_pressed_ctrl = 0;
key_already_pressed_contact = 0;
}
if(uart_ready()) {
sleep(500);
char input[1024] = {0};
uart_gets_mdf(input);
contact = input;
nio_printf("%s\r\n",input);
nio_printf("%s",input);
nio_puts("");
}
}

//Send that we are offline
uart_printf("#$#CALC:LEAVING:SMS\r\n");

//Exiting
nio_puts("Offline message sended. Exiting ...");
nio_free(&csl);
return 0;
}



For those who doesn't want to understand all of my code here is the part where I get my messages:

if(uart_ready()) {
sleep(500);
char input[1024] = {0};
uart_gets_mdf(input);
nio_printf("%s",input);
nio_puts("");
}


And here are the modified function:

char* uart_getsn_mdf(char* str, int num) {
for(int i = 0; i < num-1; i++){
if(uart_ready()) {
char c = uart_getchar();
str[i] = c;
if(c == '\b'){ i -= 2; }
else if(c == '\r') { str[i] =0; return str; }
}
}
str[num] = 0;
return str;
}

char* uart_gets_mdf(char* str)
{
        return uart_getsn_mdf(str,50);
}


If somebody wanna help me I'm taking it.
PS: I'm french so sorry for mistakes
Title: Re: TI Nspire uart
Post by: Vogtinator on January 20, 2018, 04:17:49 pm
This might be the FIFO running out of space - try to delay the sending or receive it in a tight loop.

Preferably, you register an interrupt handler on available input and read the whole fifo immediately.
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 20, 2018, 05:29:39 pm
I'm not a pro programmer just a student so what is the FIFO and how does I do that ?
Title: Re: TI Nspire uart
Post by: Vogtinator on January 20, 2018, 05:34:29 pm
The FIFO is an internal buffer which the UART hardware stores data in. If data arrives faster than you read it out, it'll fill up and no new data can be processed.
Getting interrupt handling right is not trivial, it requires quite some trial-and-error. The easiest workaround is to decrease the baud rate or just make the transmitting side slower.
You could for instance add a delay of a few ms after you sent 32 B.
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 20, 2018, 06:12:29 pm
Can you decrease the baudrate of the Ti Nspire ?
Title: Re: TI Nspire uart
Post by: Vogtinator on January 20, 2018, 06:31:47 pm
Yes, but I doubt that that would help.
If you stil want to try that, refer to the ARM pl010 manual.
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 20, 2018, 08:05:25 pm
Well I changed my android code to add 20mills sec each 10 char but no luck
Title: Re: TI Nspire uart
Post by: Vogtinator on January 20, 2018, 09:06:21 pm
Did you try a different receiver to rule out issues on the transceiving side?

Maybe try a higher delay like 1s and send 10 chars per line.

Also, I just remembered that there's a bug in the uart_getchar function which is not fixed yet, can you try the function  from https://tiplanet.org/forum/viewtopic.php?f=20&t=20611&p=222899&hilit=nspire+uart#p222899 instead?
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 20, 2018, 09:21:21 pm
I have posted this bug  ;)
And I don't have an another module
Title: Re: TI Nspire uart
Post by: Vogtinator on January 20, 2018, 09:24:30 pm
Quote from: TurtleForGaming on January 20, 2018, 09:21:21 pm
I have posted this bug  ;)


Right, whoops..

Quote
And I don't have an another module


Oscilloscope, pc with level shifters, a microcontroller kit?
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 20, 2018, 09:27:14 pm
I'have already tried that no luck
Title: Re: TI Nspire uart
Post by: Vogtinator on January 20, 2018, 09:40:53 pm
Try this (untested):


char uart_getchar(void)
{
volatile unsigned *recv_buffer_reg = (unsigned*)0x90020000;
        volatile unsigned *fr = (unsigned*)0x90020018;
while(!(*fr & 0x10))
idle();
        return *recv_buffer_reg;
}


If this doesn't work, try replacing the idle call with just a semicolon for busy waiting.
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 20, 2018, 09:45:12 pm
I'm getting:
Quoteerror: can't convert « unsigned int* » to « volatile uint8_t* {aka volatile unsigned char*} » in the initialisation
         volatile uint8_t *fr = (unsigned*)0x90020018;
Title: Re: TI Nspire uart
Post by: Vogtinator on January 20, 2018, 09:49:01 pm
As I wrote: Untested :D

Ok, fixed.
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 20, 2018, 09:54:10 pm
Well know my calc is blocked in a loop probably:
while(!(*fr & 0x10))
                idle();


And not displaying anything  ;D
Title: Re: TI Nspire uart
Post by: Vogtinator on January 20, 2018, 10:07:17 pm
Can you try without the exclamation mark in that line?
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 21, 2018, 10:00:07 am
It stilll blocking at 32 chars  :'(
Title: Re: TI Nspire uart
Post by: Vogtinator on January 21, 2018, 10:55:15 am
I'm not sure what I can do with remote debugging here...

I'd suggest you try some more ways to configure the PL010 UART, maybe try turning the FIFO off.
There's also still the possibility that there's something wrong on the sender's side.
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 21, 2018, 12:30:22 pm
Well can I increase the FIFO buffer size. If not you said that I can write an interrupt for reciveing data but I dont really know how to do that. And if all of that is not really possible how do I disable it ?
Title: Re: TI Nspire uart
Post by: Vogtinator on January 21, 2018, 12:52:41 pm
You can't change th FIFO size, it's the hardware.

For the other questions, take a look at the PL011 manual: http://infocenter.arm.com/help/topic/com.arm.doc.ddi0183f/DDI0183.pdf
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 21, 2018, 01:17:14 pm
So I have read the whole pdf but I don't see how to make an interrupt. For first I doesn't done so much C and I absolutly don't know how to make an interrupt but the one thing that I have seen fromthe pdf is that there is a byte to see if the receive FIFO is 1/2 full but I don't know how to make it work.
Title: Re: TI Nspire uart
Post by: Vogtinator on January 21, 2018, 01:31:26 pm
Interrupts aren't required to get it to work if you do everything in a loop.

Just try to configure the UART slightly differently, the register offsets and what the various bits do is all explained within the PDF document.
Title: Re: TI Nspire uart
Post by: TurtleForGaming on January 21, 2018, 04:06:55 pm
After some time I managed to make this function work :w00t:. So for now my function look like this:
char* uart_getsn(char* str, int num) {
        int i = 0;
        int max = num-1;
        while(1 && releasefunc()) {
                while(uart_ready() && isKeyPressed(KEY_NSPIRE_ESC)) {
                        if(i == max) {
                                str[i] = 0;
                                return str;
                        }
                        char c = uart_getchar();
                        str[i] = c;
                        if(c == '\b'){  i -= 2; }
                        else if(c == '\r')      { str[i] =0; return str; }
                        i++;

                }
        }
}


definitvely not perfect since i have to send \r after each command  and I have added  isKeyPressed(KEY_NSPIRE_ESC) to the while in case of stuck (append only one time) but I work for me.
Title: Re: TI Nspire uart
Post by: super-schaf on October 01, 2018, 05:23:41 pm
Hello there!

I was just doing some research, prior to starting a uart chat interface for the nspire, when I stumbled upon your lovely posts.
Great to hear someone else out there in the interwebs has the same interest!

I was wondering, Samy, if you have developed your idea any further than the previous posts suggests?
So far you have already saved me a stack of time starting from scratch, and if possible, I'd love to co-op with you to continue on this app.

With warm regards from Switzerland,
Richard

Title: Re: TI Nspire uart
Post by: TurtleForGaming on October 02, 2018, 01:39:04 pm
While I don't exactly understand you question I'm glad to hhave helped you for something and I indeed continued to work on this project after this post and the program evolved into this:
https://github.com/TurtleForGaming/nspire-communication/blob/master/nspire-client/uart_sms/hello.cpp (https://github.com/TurtleForGaming/nspire-communication/blob/master/nspire-client/uart_sms/hello.cpp) And if you want to see the whole project look at this post: https://codewalr.us/index.php?topic=2299.0 (https://codewalr.us/index.php?topic=2299.0)