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camleot23
Joined: 16 Aug 2019
Posts: 52
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| [SOLVED] dsPIC33EP UART2 Interrupt Problem |
 Posted: Fri Nov 08, 2019 1:43 am |
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Hello again,
I use CCS C compiler version 5.016 in MPLAB IDE v5.25. I have a problem
with UART2's interrupt. It is not triggering when I have data on B5 pin. I
want to read data from HZ-1050 module. It is baud rate can be configured.
I searched on the forum I saw people who had similar problems with me but
I couldn't implement them to my code and also some of them didn't work for
me. Could you help me for this problem? Here is my code:
NOTE: I have a SIM Module and it is on another rs232 -hardware uart- stream
that name is GSM. When I activate interrupt and try to get data from
__RFID STREAM CHANNEL__ the interrupt gets data from __GSM STREAM
CHANNEL__ even if I set "fgetc(RFID)" like this. It read data from GSM
stream channel and I could see them on my RS485 data. I just wanted to
mention about this problem.
| Code: |
#include <./33EP64MC204.h>
#DEVICE NESTED_INTERRUPTS=TRUE
#device PASS_STRINGS=IN_RAM
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOJTAG //JTAG disabled
#FUSES CKSFSM //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES FRC
#use delay(internal=80MHz)
#use i2c(master,I2C1,FAST)
#pin_select U1TX=PIN_B9
#pin_select U1RX=PIN_C6
#use rs232(UART1, baud=115200,parity=N,stop=1, ERRORS, stream=GSM)
#pin_select U2TX=PIN_B11 //UART RFID PINS I DON'T USE THIS TX PIN, IT IS NOT CONNECTED
//TO ANYWERE
#pin_select U2RX=PIN_B5 //I USE THIS
#use rs232(UART2, baud=9600, ERRORS, stream=RFID) //UART RFID
#use rs232(baud=9600,parity=N,stop=1,xmit=PIN_B6 ,rcv=PIN_B7,enable =PIN_B8, stream = RS485) //SOFTWARE RS485
#include <stdio.h>
#include <stdlib.h>
#include <./STRING.H>
#include <./MATH.H>
#define RFID
BOOLEAN flag = TRUE;
int j = 0;
char RFIDRecieverBuffer[200];
#ifdef RFID
#INT_RDA2 LEVEL=5
void serial_interrupt(void) {
do {
RFIDRecieverBuffer[buffer_ind] = fgetc(RFID);
buffer_ind++;
flag = TRUE;
output_low(PIN_A2);
} while (kbhit(RFID));
}
#endif
void main() {
setup_oscillator(OSC_INTERNAL, 80000000);
#ifdef RFID
enable_interrupts(INT_RDA2);
enable_interrupts(GLOBAL);
#endif
ClearGSMRecieverBuffer();
fprintf(RS485, "starting");
output_high(PIN_A2);
for (i = 0; i < 200; i++) GSMRecieverBuffer[i] = '\0'; //CLEAR ARRAY
buffer_ind = 0;
while (1) {
//******************************************************************************
// I used this for getting data with Software UART and I could got
// RFID card ID with this two line of codes.
// RFIDRecieverBuffer[0] = fgetc(RFID);
// fprintf(RS485,"%d",String[0]);
//******************************************************************************
//***************HARDWARE PRINTING CODES***************************************
if(flag){
for (j = 0; j < 200; j++) {
if (RFIDRecieverBuffer[j] == '\0') continue;
fprintf(RS485, "%c", GSMRecieverBuffer[j]);
}
flag=FALSE;
for (i = 0; i < 200; i++) GSMRecieverBuffer[i] = '\0';//CLEAR ARRAY
buffer_ind = 0;
}
}
} |
Last edited by camleot23 on Fri Nov 08, 2019 5:44 am; edited 1 time in total |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Fri Nov 08, 2019 2:20 am |
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Possibly the output is not actually going high enough.
Now the HZ1050, is nominally a 5v device, but they then specify
3.3v to 5.5v for the supply range.
Does your board does have a 5v supply for the device?.
If not, then I doubt it's output will be going high enough.
The unit uses an ATMega8 internally. This has a Voh of just 2.2v when
running off 3.3v. At 5v the Voh is instead 4.2v.
The input you are connecting to, has a Vih assuming you are using a 3.3v
supply of 2.64v, so the signal may not actually be getting high enough to
be seen.... |
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camleot23
Joined: 16 Aug 2019
Posts: 52
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| Posted: Fri Nov 08, 2019 2:30 am |
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Hi Ttelmah,
Yes I have 5v supply on my board and I can see the data that is sent from
HZ-1050 with oscilloscope and it is high enough like 5V. I don't think the
problem is about signal levels. Even if there would be a problem with logic
levels, how could I get data via software rs232? (I couldn't post this, I tried
Software rs232 and I could get data.)
What else can it be? Is there any problem with UART2 compiler bug? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Fri Nov 08, 2019 5:04 am |
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You have a major fault in your code, which will be causing issues.
Later compilers will spot it, but yours doesn't. You have defined RFID to
a different value, when it is already used as the STREAM name. This means
your putc/getc operations are not actually talking to the stream..... |
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camleot23
Joined: 16 Aug 2019
Posts: 52
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| Posted: Fri Nov 08, 2019 5:29 am |
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You mean #define RFID line is causing problems because I have decleared a
stream name with the same name? If it is so, I've deleted #define line and tried
it again and no, it didn't work again  I suspect that I couldn't be clear about my problem.
My problem is about interrupt itself. I can't enter into interrupt function. Because I turn a LED on
on my board before "while" and after "main" and I turn it off in my interrupt function. However , while I try to send data,
my LED still stays on. So, it means interrupt is not working.
EDIT: My bad, it is working.  The problem was about #define line. After I've deleted it worked. At first, I forgot activating interrupts :D .Thank you Ttelmah. What would I do if you didn't help me :D Thanks a lot. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Fri Nov 08, 2019 7:43 am |
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When you create a stream, it almost does a 'invisible define' of the value,
but you can't use it as a define. You can though 'test it. So you could
replace your 'ifdef' lines with:
#if (RFID!=0)
and this will test as 'TRUE' if the RFID stream is declared. Will though give
an undefined identifier warning when RFID is not defined.
Designed to catch you out.... |
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camleot23
Joined: 16 Aug 2019
Posts: 52
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| Posted: Fri Nov 08, 2019 9:08 am |
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Hmm.. I see, I didn't know this. Thank you again. You always teach me new things  |
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