I am having some issues when I am trying to switch the pins on the GPIO pins being used for CAN on the DSP. When the program boots up it we default for Can A to be pins 18/19. But when I give it the command to switch pins for Ecan it does not work. I want to know if I am missing something in the process of switching the GPIO pins. Any help would be greatly appreciated. Let me know If you need to see more of the code but below is the section I use to select the GPIO pins.
CanAValue can be 0 or 1.
void InitECanaGpio(Uint16 CanAValue)
{
EALLOW;
switch (CanAValue){
case 0:
//default setting
/* Enable internal pull-up for the selected CAN pins */
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0; // Enable pull-up for GPIO18 (CANRXA)
GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0; // Enable pull-up for GPIO19 (CANTXA)
/* Set qualification for selected CAN pins to asynch only */
// Inputs are synchronized to SYSCLKOUT by default.
// This will select asynch (no qualification) for the selected pins.
GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // Asynch qual for GPIO18 (CANRXA)
/* Configure eCAN-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be eCAN functional pins.
GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 3; // Configure GPIO18 for CANRXA operation
GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 3; // Configure GPIO19 for CANTXA operation
GpioCtrlRegs.GPADIR.bit.GPIO19 = 1; //Configure CANTXA as output
break;
case 1:
/* Enable internal pull-up for the selected CAN pins */
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.
GpioCtrlRegs.GPAPUD.bit.GPIO30 = 0; // Enable pull-up for GPIO30 (CANRXA)
GpioCtrlRegs.GPAPUD.bit.GPIO31 = 0; // Enable pull-up for GPIO31 (CANTXA)
/* Set qualification for selected CAN pins to asynch only */
// Inputs are synchronized to SYSCLKOUT by default.
// This will select asynch (no qualification) for the selected pins.
GpioCtrlRegs.GPAQSEL2.bit.GPIO30 = 3; // Asynch qual for GPIO30 (CANRXA)
/* Configure eCAN-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be eCAN functional pins.
GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 1; // Configure GPIO30 for CANRXA operation
GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 1; // Configure GPIO31 for CANTXA operation
GpioCtrlRegs.GPADIR.bit.GPIO31 = 1; //Configure CANTXA as output
break;
}
EDIS;
}
