Aplication crashes when using two timers and I2C (EK-TM4C123GXL)

* UPDATE *

Replaced the timer instance in the RTC module by calls to Task_sleep(). Still crashing.

In the timer instantiation code "Timer_create()", replaced "Timer_ANY" by 4. Not crashing anymore.

Tested all possible values for ID parameter. Application crashes if ID < 4, it works if ID is 4 or 5. After this point I remembered that for the RTC timer I was using 4 as ID, this is why it was working all the time.

Is there a reason for the I2C module not work when timer 0, 1, 2 or 3 are enabled?

Hi Lucas,

Can you please clarify, what version of TI-RTOS and CCS are you currently using?

Does the LCD create the timer using SYS/BIOS APIs?  What Timer IDs are you using to create the Timers?  Would it be possible for you to post some code snips?

Regards,

-- Emmanuel

Hi, I stopped working in this application for a while, but now I am back to work. I have made some inprovements in the code and fixed some bugs, but the fault related to I2C and Timers still occurs.

I am using TivaWare lib v 2.1.0.12573c and SYSBIOS v 6.41.00.26.

Scenario: I use a Timer module in some part of the code, and it is instantiated in the main function before Bios_Start():

		Timer_Params l_timer_prms;
		Error_Block l_eb;
		Error_init(&l_eb);
		Timer_Params_init(&l_timer_prms);
		l_timer_prms.periodType = Timer_PeriodType_MICROSECS;
		l_timer_prms.runMode = Timer_RunMode_CONTINUOUS;
		l_timer_prms.startMode = Timer_StartMode_USER;
		l_timer_prms.arg = (UArg) l_instance;
		l_timer_prms.period = period;
		l_instance->timer = Timer_create(MY_TIMER_ID, tick_timer_fxn, &l_timer_prms, &l_eb);
		if (l_instance->timer == NULL)
			l_alloc_error = TRUE;
		else
			l_resources |= RES_TIMER;

And in other part of the code I create an I2C module, as follows. The I2C module is created in a Task context.

		I2C_Params l_i2c_params;
		I2C_Params_init(&l_i2c_params);
		l_i2c_params.bitRate = I2C_400kHz;
		m_i2c = I2C_open(I2C_PERIPHERAL_NUM, &l_i2c_params); // I2C_PERIPHERAL_NUM = 0

If MY_TIMER_ID is >= 4, the application works perfect. If MY_TIMER_ID < 4, a crash occurs when the function I2C_open() is called.

I followed the execution with the debugger, the sequence of calls is as follows:

I2C_Handle I2C_open(unsigned int index, I2C_Params *params)
I2C_Handle I2CTiva_open(I2C_Handle handle, I2C_Params *params)
void I2CMasterInitExpClk(uint32_t ui32Base, uint32_t ui32I2CClk, bool bFast);
I2CMasterInitExpClk()
I2CMasterEnable()
(instruction) 6A03     LDR             R3, [R0, #32]
ti_sysbios_family_arm_m3_Hwi_excHandlerAsm__I()

The exception information given by ROV:

Decoded exception,
Decoded,Hard Fault: FORCED: BUSFAULT: PRECISERR.Data Access Error. Address = 0x40021020
Exception context,
$addr,0x200033e8
$type,ti.sysbios.family.arm.m3.Hwi.ExcContext
threadType,ti.sysbios.BIOS.ThreadType_Task
threadHandle,0x20002fe8
threadStack,0x20003038
threadStackSize,1504
r0,0x40021000
r1,0x4c4b400
r2,0x1
r3,0x13c80
r4,0x40021000
r5,0x4c4b400
r6,0x1
r7,0x0
r8,0x0
r9,0x200035d8
r10,0x1
r11,0xffffffff
r12,0x1398c
sp,0x200034c0
lr,0xc131
pc,0xc118
psr,0x1000000
ICSR,0x400803
MMFSR,0x0
BFSR,0x82
UFSR,0x0
HFSR,0x40000000
DFSR,0xb
MMAR,0x40021020
BFAR,0x40021020
AFSR,0x0
Exception call stack,
0    I2CMasterEnable() at Hwi.c:0,PC = 0x0000C118 FP = 0x200034C0
1    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x200034C0
2    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x00011334 FP = 0x200034C8
3    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x200034C8
4    I2CTiva_open(struct I2C_Config *, struct I2C_Params *) at I2CTiva.c:512,PC = 0x00005ED8 FP = 0x200034D0
5    I2C_open(unsigned int, struct I2C_Params *) at I2C.c:103,PC = 0x00005DF8 FP = 0x20003530
6    sys_init_modules() at system.c:78,PC = 0x00003A32 FP = 0x00000008
7    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x4B25468C FP = 0x000000B8
8    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000B8
9    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x4B25468C FP = 0x000000C0
10    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000C0
11    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x1001F240 FP = 0x000000C8
12    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000C8
13    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x7080F04E FP = 0x000000D0
14    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000D0
15    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x47706188 FP = 0x000000D8
16    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000D8
17    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x8114F3EE FP = 0x000000E0
18    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000E0
19    _c_int00() at EK_TM4C123GXL.c:0,PC = 0xF3822200 FP = 0x000000E8
20    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000E8
21    _c_int00() at EK_TM4C123GXL.c:0,PC = 0xF8DFB402 FP = 0x000000F0
22    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000F0
23    _c_int00() at EK_TM4C123GXL.c:0,PC = 0xBC01BC00 FP = 0x000000F8
24    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x000000F8
25    _c_int00() at EK_TM4C123GXL.c:0,PC = 0xF3812102 FP = 0x00000100
26    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000100
27    _c_int00() at EK_TM4C123GXL.c:0,PC = 0xE048F8DE FP = 0x00000108
28    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000108
29    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x5180F04E FP = 0x00000110
30    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000110
31    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x8811F380 FP = 0x00000118
32    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000118
33    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x0F04F01E FP = 0x00000120
34    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000120
35    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x46698108 FP = 0x00000128
36    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000128
37    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x0B08F850 FP = 0x00000130
38    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000130
39    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x0B10ECB0 FP = 0x00000138
40    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000138
41    _c_int00() at EK_TM4C123GXL.c:0,PC = 0x468D8808 FP = 0x00000140
42    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000140
43    _c_int00() at EK_TM4C123GXL.c:0,PC = 0xE000ED04 FP = 0x00000148
44    exit(int) at exit.c:65,PC = 0x0000C20F FP = 0x00000148
45    ti_sysbios_family_arm_m3_Hwi_doSwiRestore__I(unsigned int) at Hwi.c:1414,PC = 0x00009288 FP = 0x00000150
46    ti_sysbios_family_arm_m3_Hwi_doSwiRestore__I(unsigned int) at Hwi.c:1414,PC = 0x00009288 FP = 0x200034C0

I still do not understand the reason of this crash and it is driving me crazy. Any help is welcome.

Not sure if it's the same issue, but I had a similar problem when using timers - debugger throws ti_sysbios_family_arm_m3_Hwi_excHandlerAsm__I. Turns out I wasn't setting the RCGCTIMER register. I added SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER3); to my code and it's working now. I was using Timer3.

Hey,
I am facing this error right now!!! :( Same launchpad, 1 i2c task and 1 timer. both are made dynamically.

I have I2C and Timer. tasks. When I start the timer a bit later I2C task is gone. The ROV says the I2C task is preemted.

And here is the output:

e: 0x20001800.
Task stack size: 0x800.
R0 = 0x40021000  R8  = 0x00000000
R1 = 0x04c4b400  R9  = 0x00000001
R2 = 0x00000000  R10 = 0xffffffff
R3 = 0x04c4b400  R11 = 0xffffffff
R4 = 0x20004910  R12 = 0x20001e90
R5 = 0x0000c120  SP(R13) = 0x20001ef8
R6 = 0x0000be0c  LR(R14) = 0x00008cf1
R7 = 0x20001fb4  PC(R15) = 0x0000b61e
PSR = 0x61000000
ICSR = 0x00425803
MMFSR = 0x00
BFSR = 0x82
UFSR = 0x0000
HFSR = 0x40000000
DFSR = 0x0000000b
MMAR = 0x40021020
BFAR = 0x40021020
AFSR = 0x00000000
Terminating execution...

Anyway, is there any method to convert this error code for readable message? It is very hard to find out what is the reason based on only numbers...

Changing the timer to fixed 4 the outcome is the following:

{module#45}: line 288: error {id:0x1e0000, args:[0x4, 0x0]}
xdc.runtime.Error.raise: terminating execution

Unfortunately the ROV -> BIOS -> Scan for error shows nothing.