Hello,
We are currently using the F28M35H52C1 Rev B. We had used Rev X until this problem started showing up.
I have built a small test program for the M3 (attached). The program simply sets up GPIO Port J pins 6 & 7 as outputs, and toggles them in a while loop. The issue I'm currently seeing is that if one of these pins is low and I pull the other high, it briefly pulls them both high. I am using a logic analyzer to watch the output on the GPIOs.
Test cases:
PJ6 Low, Pull PJ7 High. Result: PJ6 high for a few microseconds then returns low.
PJ7 Low, Pull PJ6 High. Result : PJ7 high for a few microseconds then returns low.
I've verified with a continuity meter that there is no external short between these two pins.
Any direction or insight is greatly appreciated.
Thanks!
Tom
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_nvic.h"
#include "inc/hw_gpio.h"
#include "inc/hw_types.h"
#include "inc/hw_sysctl.h"
#include "driverlib/debug.h"
#include "driverlib/interrupt.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"
#include "module.h"
#include "M3util.h"
int main(void) {
// Disable Protection
HWREG(SYSCTL_MWRALLOW) = 0xA5A5A5A5;
// Sets up PLL, M3 running at 100MHz and C28 running at 100MHz
SysCtlClockConfigSet(SYSCTL_USE_PLL | (SYSCTL_SPLLIMULT_M & 0xA) |
SYSCTL_SYSDIV_1 | SYSCTL_M3SSDIV_1 |
SYSCTL_XCLKDIV_4);
// Enable clock supply for GPIOC
// SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
// Disable clock supply for the watchdog modules
SysCtlPeripheralDisable(SYSCTL_PERIPH_WDOG1);
SysCtlPeripheralDisable(SYSCTL_PERIPH_WDOG0);
// Setup hardware UART pins.
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);
GPIOPinUnlock(GPIO_PORTJ_BASE, GPIO_PIN_7 | GPIO_PIN_6);
GPIOPinTypeGPIOOutput(GPIO_PORTJ_BASE, GPIO_PIN_7 | GPIO_PIN_6);
// Enable processor interrupts.
IntMasterEnable();
int state = 0;
while(1){
GPIOPinWrite(GPIO_PORTJ_BASE, GPIO_PIN_7, state);
delay(100);
GPIOPinWrite(GPIO_PORTJ_BASE, GPIO_PIN_6, ~state);
delay(100);
state ^= 0xffff;
}
}
