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dluu13
Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON
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| fat.c and i2c stream "Error#12 Undefined identifier |
 Posted: Fri Sep 28, 2018 9:21 am |
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I am working on a project with the PIC16F19175 on version 5.078 of CCS.
In my code, I have set up RS232 UART, I2C, and some other peripherals and have them all working. I am now trying to also integrate an SD card into my project using mmcsd.c and fat.c. When #include ".\fat.c", my code suddenly does not compile, saying that my stream identifier for I2C is undefined. This happens whether I use the original <fat.c> or if I use the one from this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=53787
At this point, I am not yet concerned about any hardware hookups since the code does not even compile.
Here is the code that I feel is relevant:
| Code: |
#include <16F19175.h>
#include "PIC16F19175regs.h"
#DEVICE ADC=12
#use delay(clock=16000000)
#PIN_SELECT U2RX=PIN_B7
#PIN_SELECT U2TX=PIN_B6
#use rs232(baud=9600, UART2, bits=8, parity=N, stop=1, stream=PC, ERRORS)
#use i2c(MASTER, scl=PIN_E0, sda=PIN_E1, stream=dipSwitch, FORCE_SW)
#include <stdio.h>
#include <stdlib.h>
#define MMCSD_PIN_SCL PIN_C3 //o
#define MMCSD_PIN_SDI PIN_C4 //i
#define MMCSD_PIN_SDO PIN_C1 //o
#define MMCSD_PIN_SELECT PIN_A5 //o
#include ".\mmcsd.c"
#include ".\fat.c"
// In this function, dipSwitch is an undefined identifier
unsigned int dipReader()
{
unsigned int ans = 0;
disable_interrupts(GLOBAL);
i2c_start(dipSwitch);
i2c_write(dipSwitch, 0x41);
ans = (int8) i2c_read(dipSwitch, 1);
ans = (int8) i2c_read(dipSwitch, 0);
i2c_stop(dipSwitch); // stop the i2c stream
enable_interrupts(GLOBAL);
return ans;
}
int main(int argc, char** argv)
{
while(1)
{
delay_ms(1000);
fprintf(PC, "%u\r\n", dipReader());
}
return 0;
}
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I get this error for every instance of "dipSwitch" in the i2c functions:
| Code: |
Error#12 Undefined identifier dipSwitch
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I can get away with not naming the stream in the i2c functions, but I would rather keep them there to make code easier to read in the future.
Does anybody have experience dealing with this problem? Why does the stream identifier break when I introduce fat.c?
I am fairly certain that it is fat.c that breaks the stream identifier. I have gotten rid of #use rs232 and I still get the same issue.
Please let me know if there is any other info that would help solve the issue. Thanks for your help.
ps. Before you ask, I am planning to use a SparkFun level translator between my 5V PIC and the SD card. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19546
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| Posted: Fri Sep 28, 2018 10:03 am |
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Change the name.
Do a search for dipswitch. You'll probably find that the fat driver has a #define somewhere setting this to a value, so when used as a stream name, it is undefined as such.... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Sep 28, 2018 1:53 pm |
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I investigated this and a duplicate name is not the problem.
I shortened the name to dipSw and I still got the error.
The two main facts are:
1. CCS is secretly promoting the mixed case stream name in the
#use i2c() statement to all caps. Putting a #case statement above
that line does not change this.
2. The fat.c file has a #case statement near the top.
This results in 'DIPSW' in the stream definition not matching 'dipSw' in
the i2c_start(DipSw) line and you get the error.
The solution is to use all caps for the stream name, everywhere in your
code. You could remove #case from fat.c, but potentially that would
cause other problems. It's easier to use DIPSW everywhere.
Test program:
| Code: | #include <16F19175.h>
#use delay(internal=16M)
#use i2c(MASTER, scl=PIN_E0, sda=PIN_E1, stream=dipSw, FORCE_SW)
#case // fat.c contains a #case statement here
//=======================================
void main()
{
i2c_start(dipSw); // This causes an Undefined Identifier error
i2c_start(DIPSW); // This compiles OK
while(TRUE);
} |
After writing this up I searched for prior posts and found
this one in March 2018 by temtronic:
http://www.ccsinfo.com/forum/viewtopic.php?t=57063 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19546
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| Posted: Sat Sep 29, 2018 2:12 am |
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Yes this is odd.
I've always used upper case for stream names. Like defines. I remember that older post coming up, but hadn't 'filed it' as of interest, since I use upper case. Should have twigged in this one.
Well done PCM_programmer. |
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dluu13
Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON
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| Posted: Tue Oct 02, 2018 2:39 pm |
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I see I'm getting replies from some prolific members :D
Yes, in my case, it seems like it is the #case in fat.c that is causing the issue.
I hadn't considered trying all caps before. After renaming the stream name with all caps, I can now use the stream name within the I2C functions.
Thanks for the help! |
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