RM57L LaunchPad Input Multiplexing

Hi Anthony,

Thank you for the timely and detailed explanation!

Yes, I will use eCAP2 or another instead. I found the N1 ball in that schematics file "L A U N C H X L 2 _ 5 7 0 L C 4 3 _ R M 5 7 L" but not on the LaunchPad. Is the schematics file specified for HDK?

Thank you once again!

Best regards,
Honig

Hi Anthony,

I have following questions regarding to the same example:

1. Under "PINMUX" tab after checking boxes "ETPWM" and "ECAP", ball A4 has a conflict. I removed ETPWM1SYNCI (synchronization of PWM to another input signal?), since the generated PWM in this tutorial should be considered as output. Must the synchronization of PWM signal refer to an external PWM signal or signals of other forms of waves? And since TBCLK sync (interal synchronization?) is enabled, ETPWM1SYNCI and ETPWM1SYNCO can both be disconnected?

2. Under "ETPWM1" tab in Clock Configuration, VCLK3 (MHz) the value 75.000 cannot be changed. Moreover HSPCLKDIV and CLKDIV are to be set to 0 according to the screen shot in the example, but the following codes mean that both of them should be set to 1.

/* Alternate code for configuring ETPWM and ECAP */
/* Set the TBCLK frequency = VCLK4 frequency = 90MHz */
etpwmSetClkDiv(etpwmREG1, ClkDiv_by_1, HspClkDiv_by_1);

Divided by 0 .. hmm doesn't make sense, so "set 0 (or 1) in GUI" mean "set 1 in the code"?

3. Under "ETPWM1" tab in PWM Configuration, there are two PWM (ETPWM xA and xB). Can I close either of them in the configuration?

Thanks in advance!

Best regards,
Honig

HI Anthony, 

Regarding the same example "etpwm_ecap", 

I have tried to use ECAP1 to check the PWM generated by HET1, but I was even not able to compile the code. Is the ePWM module is the unique option?

The modified "HL_sys_main.c" is the following:

------------------------------------------------------------------------------------------------------

/* Include Files */

#include "HL_sys_common.h"

/* USER CODE BEGIN (1) */

#include "stdio.h" /* printf */
#include "HL_system.h"
#include "HL_het.h" //#include "HL_etpwm.h"
#include "HL_ecap.h"

/* USER CODE END */

void main(void)
{
/* USER CODE BEGIN (3) */

/* Enable interrupt */
_enable_interrupt_();

#if 1
/* Initialize HET module */
hetInit();
/* Initialize ECAP module */
ecapInit();

#else
/* Alternate code for configuring ECP */

/* Configure ECAP2 */
/* Configure Event 1 to Capture the rising edge */
ecapSetCaptureEvent1(ecapREG2, RISING_EDGE, RESET_DISABLE);

/* Configure Event 2 to Capture the falling edge */
ecapSetCaptureEvent2(ecapREG2, FALLING_EDGE, RESET_DISABLE);

/* Configure Event 3 to Capture the rising edge with reset counter enable */
ecapSetCaptureEvent3(ecapREG2, RISING_EDGE, RESET_ENABLE);

/* Set Capure mode as Continuous and Wrap event as CAP3 */
ecapSetCaptureMode(ecapREG2, CONTINUOUS, CAPTURE_EVENT3);

/* Start counter */
ecapStartCounter(ecapREG2);

/* Enable Loading on Capture */
ecapEnableCapture(ecapREG2);

/* Enable Interrupt for CAP3 event */
ecapEnableInterrupt(ecapREG2, ecapInt_CEVT3);

#endif

/* Run forever */
while(1);

/* USER CODE END */
}

/* USER CODE BEGIN (4) */

void ecapNotification(ecapBASE_t *ecap, uint16 flags)
{
/* #41 expected an identifier */
uint32 cap1, cap2, cap3;
float64 duty, period;

/* #138 expression must be a modifiable lvalue */
cap1 = ecapGetCAP1(ecapREG2);
cap2 = ecapGetCAP2(ecapREG2);
cap3 = ecapGetCAP3(ecapREG2);

duty = (cap2 - cap1) * 1000 / VCLK4_FREQ;
period = (cap3 - cap1) * 1000 / VCLK4_FREQ;

printf("Duty = %fns\n", duty);
printf("Period = %fns\n\n", period);

}

/* USER CODE END */


------------------------------------------------------------------------------------------------------

Compile and fail with errors:

Description	Resource	Path	Location	Type
#138 expression must be a modifiable lvalue	HL_sys_main.c	/hetPwm_ecap_RM57L/source	line 125	C/C++ Problem
#138 expression must be a modifiable lvalue	HL_sys_main.c	/hetPwm_ecap_RM57L/source	line 126	C/C++ Problem
#138 expression must be a modifiable lvalue	HL_sys_main.c	/hetPwm_ecap_RM57L/source	line 127	C/C++ Problem
#41 expected an identifier	HL_sys_main.c	/hetPwm_ecap_RM57L/source	line 122	C/C++ Problem

Thanks in advance!

Best regards,

Honig

Hi Anthony,

There are several ways to enable interrupts:

/* Enable both IRQ */
_enable_IRQ_interrupt_(); // declared in "HL_sys_core.h"
_enable_IRQ(); // where is its declaration?

/* Enable both IRQ and FIQ */
_enable_interrupt_(); // declared in "HL_sys_core.h"

In this example "etpwm_ecap", FIQ interrupt is used, so we can use _enable_IRQ(); instead?

Thanks in advance!

Best regards,

Honig

Honig,

Regarding #41, I don't 'see' a problem with your code.  uint32 should be defined in HL_hal_stdtypes.h.

II'm guessing that the #138 errors are a secondary effect of the #41 errors though.

Do you get any error messages about not being able to find the header files when you build?

Also are you building on linux.  there were some forum posts about this error #41 where it seems like the path to the header file is case sensitive.