Exemplo n.º 1
0
void Xint_Gpio_Init(void) {
	// GPIO20 and GPIO21 are inputs
	EALLOW;
	GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 0;         // GPIO
	GpioCtrlRegs.GPADIR.bit.GPIO20 = 0;          // input
	GpioCtrlRegs.GPAQSEL2.bit.GPIO20 = 2;        // Sync
	GpioCtrlRegs.GPACTRL.bit.QUALPRD2 = 0x1F;    // Each sampling window is 32*SYSCLKOUT

	GpioCtrlRegs.GPAMUX2.bit.GPIO21 = 0;         // GPIO
	GpioCtrlRegs.GPADIR.bit.GPIO21 = 0;          // input
	GpioCtrlRegs.GPAQSEL2.bit.GPIO21 = 2;        // XINT2 Qual using 6 samples
	GpioCtrlRegs.GPACTRL.bit.QUALPRD2 = 0x1F;    // Each sampling window is 32*SYSCLKOUT

	// GPIO20 is XINT1, GPIO21 is XINT2
	GPIO_SetupXINT1Gpio(20);
	GPIO_SetupXINT2Gpio(21);
}
Exemplo n.º 2
0
//
// Gpio_setup2 - Communications Pinout.
//               This basic communications pinout includes:
//               PWM1-3, CAP1, CAP2, SPI-A, SPI-B, CAN-A, SCI-A and I2C
//               and a number of I/O pins
//
void Gpio_setup2(void)
{
   //
   // Enable PWM1-3 on GPIO0-GPIO5
   //
   EALLOW;
   GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0;   // Enable pullup on GPIO0
   GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0;   // Enable pullup on GPIO1
   GpioCtrlRegs.GPAPUD.bit.GPIO2 = 0;   // Enable pullup on GPIO2
   GpioCtrlRegs.GPAPUD.bit.GPIO3 = 0;   // Enable pullup on GPIO3
   GpioCtrlRegs.GPAPUD.bit.GPIO4 = 0;   // Enable pullup on GPIO4
   GpioCtrlRegs.GPAPUD.bit.GPIO5 = 0;   // Enable pullup on GPIO5
   GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;  // GPIO0 = PWM1A
   GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 1;  // GPIO1 = PWM1B
   GpioCtrlRegs.GPAMUX1.bit.GPIO2 = 1;  // GPIO2 = PWM2A
   GpioCtrlRegs.GPAMUX1.bit.GPIO3 = 1;  // GPIO3 = PWM2B
   GpioCtrlRegs.GPAMUX1.bit.GPIO4 = 1;  // GPIO4 = PWM3A
   GpioCtrlRegs.GPAMUX1.bit.GPIO5 = 1;  // GPIO5 = PWM3B

   //
   // Enable an GPIO output on GPIO6
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO6 = 0;   // Enable pullup on GPIO6
   GpioDataRegs.GPASET.bit.GPIO6 = 1;   // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 0;  // GPIO6 = GPIO6
   GpioCtrlRegs.GPADIR.bit.GPIO6 = 1;   // GPIO6 = output

   //
   // Enable eCAP1 on GPIO7
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO7 = 0;   // Enable pullup on GPIO7
   GpioCtrlRegs.GPAQSEL1.bit.GPIO7 = 0; // Synch to SYSCLKOUT
   InputXbarRegs.INPUT7SELECT = 7;           // GPIO7 = ECAP1

   //
   // Enable GPIO outputs on GPIO8 - GPIO11
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO8 = 0;   // Enable pullup on GPIO8
   GpioDataRegs.GPASET.bit.GPIO8 = 1;   // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO8 = 0;  // GPIO8 = GPIO8
   GpioCtrlRegs.GPADIR.bit.GPIO8 = 1;   // GPIO8 = output

   GpioCtrlRegs.GPAPUD.bit.GPIO9 = 0;   // Enable pullup on GPIO9
   GpioDataRegs.GPASET.bit.GPIO9 = 1;   // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO9 = 0;  // GPIO9 = GPIO9
   GpioCtrlRegs.GPADIR.bit.GPIO9 = 1;   // GPIO9 = output

   GpioCtrlRegs.GPAPUD.bit.GPIO10 = 0;  // Enable pullup on GPIO10
   GpioDataRegs.GPASET.bit.GPIO10 = 1;  // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO10 = 0; // GPIO10 = GPIO10
   GpioCtrlRegs.GPADIR.bit.GPIO10 = 1;  // GPIO10 = output

   GpioCtrlRegs.GPAPUD.bit.GPIO11 = 0;  // Enable pullup on GPIO11
   GpioDataRegs.GPASET.bit.GPIO11 = 1;  // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO11 = 0; // GPIO11 = GPIO11
   GpioCtrlRegs.GPADIR.bit.GPIO11 = 1;  // GPIO11 = output

   //
   // Enable SPI-B on GPIO22 - GPIO25
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO22 = 0;   // Enable pullup on GPIO12 (SPISIMOB)
   GpioCtrlRegs.GPAPUD.bit.GPIO22 = 0;   // Enable pullup on GPIO13 (SPISOMIB)
   GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0;   // Enable pullup on GPIO14 (SPICLKB)
   GpioCtrlRegs.GPAPUD.bit.GPIO25 = 0;   // Enable pullup on GPIO15 (SPISTEB)
   GpioCtrlRegs.GPAQSEL2.bit.GPIO22 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO23 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO25 = 3; // asynch input
   GpioCtrlRegs.GPAGMUX2.bit.GPIO22 = 1; // Set Group Mux
   GpioCtrlRegs.GPAGMUX2.bit.GPIO23 = 1; // Set Group Mux
   GpioCtrlRegs.GPAGMUX2.bit.GPIO24 = 1; // Set Group Mux
   GpioCtrlRegs.GPAGMUX2.bit.GPIO25 = 1; // Set Group Mux
   GpioCtrlRegs.GPAMUX2.bit.GPIO22 = 2;  // GPIO22 = SPICLKB
   GpioCtrlRegs.GPAMUX2.bit.GPIO23 = 2;  // GPIO23 = SPISTEB
   GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 2;  // GPIO24 = SPISIMOB
   GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 2;  // GPIO25 = SPISOMIB

   //
   // Enable SPI-A on GPIO16 - GPIO19
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0;   // Enable pullup on GPIO16 (SPICLKA)
   GpioCtrlRegs.GPAPUD.bit.GPIO17 = 0;   // Enable pullup on GPIO17 (SPIS0MIA)
   GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0;   // Enable pullup on GPIO18 (SPICLKA)
   GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0;   // Enable pullup on GPIO19 (SPISTEA)
   GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO17 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3; // asynch input
   GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1;  // GPIO16 = SPICLKA
   GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 1;  // GPIO17 = SPIS0MIA
   GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1;  // GPIO18 = SPICLKA
   GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 1;  // GPIO19 = SPISTEA

   //
   // Enable eCAP1 on GPIO24
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0;   // Enable pullup on GPIO24 (ECAP1)
   GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 0; // Synch to SYSCLKOUT
   InputXbarRegs.INPUT7SELECT = 24;      // GPIO24 = ECAP1

   //
   // Set input qualification period for GPIO25 & GPIO26 inputs
   //
   GpioCtrlRegs.GPACTRL.bit.QUALPRD3=1;  // Qual period = SYSCLKOUT/2
   GpioCtrlRegs.GPAQSEL2.bit.GPIO25=2;   // 6 samples
   GpioCtrlRegs.GPAQSEL2.bit.GPIO26=1;   // 3 samples

   //
   // Make GPIO25 the input source for XINT1
   //
   GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 0; // GPIO25 = GPIO25
   GpioCtrlRegs.GPADIR.bit.GPIO25 = 0;  // GPIO25 = input
   GPIO_SetupXINT1Gpio(25);             // XINT1 connected to GPIO25

   //
   // Make GPIO26 the input source for XINT2
   //
   GpioCtrlRegs.GPAMUX2.bit.GPIO26 = 0; // GPIO26 = GPIO26
   GpioCtrlRegs.GPADIR.bit.GPIO26 = 0;  // GPIO26 = input
   GPIO_SetupXINT2Gpio(26);             // XINT2 connected to GPIO26

   //
   // Make GPIO27 wakeup from HALT/STANDBY Low Power Modes
   //
   GpioCtrlRegs.GPAMUX2.bit.GPIO27 = 0; // GPIO27 = GPIO27
   GpioCtrlRegs.GPADIR.bit.GPIO27 = 0;  // GPIO27 = input
   CpuSysRegs.GPIOLPMSEL0.bit.GPIO27=1; // GPIO27 will wake the device
   CpuSysRegs.LPMCR.bit.QUALSTDBY = 2;  // Qualify GPIO27 by 2 OSCCLK
                                        // cycles before waking the device
                                        // from STANDBY

   //
   // Enable SCI-A on GPIO28 - GPIO29
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0;   // Enable pullup on GPIO28
   GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3; // asynch input
   GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 1;  // GPIO28 = SCIRXDA
   GpioCtrlRegs.GPAPUD.bit.GPIO29 = 0;   // Enable pullup on GPIO29
   GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 1;  // GPIO29 = SCITXDA

   //
   // Enable CAN-A on GPIO30 - GPIO31
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO30 = 0;   // Enable pullup on GPIO30
   GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 1;  // GPIO30 = CANTXA
   GpioCtrlRegs.GPAPUD.bit.GPIO31 = 0;   // Enable pullup on GPIO31
   GpioCtrlRegs.GPAQSEL2.bit.GPIO31 = 3; // asynch input
   GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 1;  // GPIO31 = CANRXA

   //
   // Enable I2C-A on GPIO32 - GPIO33
   //
   GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0;   // Enable pullup on GPIO32
   GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0;   // Enable pullup on GPIO33
   GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3; // asynch input
   GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3; // asynch input
   GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1;  // GPIO32 = SDAA
   GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1;  // GPIO33 = SCLA

   //
   // Make GPIO34 an input
   //
   GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0;   // Enable pullup on GPIO34
   GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0;  // GPIO34 = GPIO34
   GpioCtrlRegs.GPBDIR.bit.GPIO34 = 0;   // GPIO34 = input

   EDIS;
}
Exemplo n.º 3
0
//
// Gpio_setup1 - Basic Pinout.
//               This basic pinout includes:
//               PWM1-3, ECAP1, ECAP2, TZ1-TZ4, SPI-A, EQEP1, SCI-A, I2C
//               and a number of I/O pins
//
void Gpio_setup1(void)
{
   //
   // These can be combined into single statements for improved
   // code efficiency.
   //

   //
   // Enable PWM1-3 on GPIO0-GPIO5
   //
   EALLOW;
   GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0;   // Enable pullup on GPIO0
   GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0;   // Enable pullup on GPIO1
   GpioCtrlRegs.GPAPUD.bit.GPIO2 = 0;   // Enable pullup on GPIO2
   GpioCtrlRegs.GPAPUD.bit.GPIO3 = 0;   // Enable pullup on GPIO3
   GpioCtrlRegs.GPAPUD.bit.GPIO4 = 0;   // Enable pullup on GPIO4
   GpioCtrlRegs.GPAPUD.bit.GPIO5 = 0;   // Enable pullup on GPIO5
   GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;  // GPIO0 = PWM1A
   GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 1;  // GPIO1 = PWM1B
   GpioCtrlRegs.GPAMUX1.bit.GPIO2 = 1;  // GPIO2 = PWM2A
   GpioCtrlRegs.GPAMUX1.bit.GPIO3 = 1;  // GPIO3 = PWM2B
   GpioCtrlRegs.GPAMUX1.bit.GPIO4 = 1;  // GPIO4 = PWM3A
   GpioCtrlRegs.GPAMUX1.bit.GPIO5 = 1;  // GPIO5 = PWM3B

   //
   // Enable an GPIO output on GPIO6, set it high
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO6 = 0;   // Enable pullup on GPIO6
   GpioDataRegs.GPASET.bit.GPIO6 = 1;   // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 0;  // GPIO6 = GPIO6
   GpioCtrlRegs.GPADIR.bit.GPIO6 = 1;   // GPIO6 = output

   //
   // Enable eCAP1 on GPIO7
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO7 = 0;    // Enable pullup on GPIO7
   GpioCtrlRegs.GPAQSEL1.bit.GPIO7 = 0;  // Synch to SYSCLOUT
   InputXbarRegs.INPUT7SELECT = 7;       // GPIO7 = ECAP1

   //
   // Enable GPIO outputs on GPIO8 - GPIO11, set it high
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO8 = 0;   // Enable pullup on GPIO8
   GpioDataRegs.GPASET.bit.GPIO8 = 1;   // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO8 = 0;  // GPIO8 = GPIO8
   GpioCtrlRegs.GPADIR.bit.GPIO8 = 1;   // GPIO8 = output

   GpioCtrlRegs.GPAPUD.bit.GPIO9 = 0;   // Enable pullup on GPIO9
   GpioDataRegs.GPASET.bit.GPIO9 = 1;   // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO9 = 0;  // GPIO9 = GPIO9
   GpioCtrlRegs.GPADIR.bit.GPIO9 = 1;   // GPIO9 = output

   GpioCtrlRegs.GPAPUD.bit.GPIO10 = 0;  // Enable pullup on GPIO10
   GpioDataRegs.GPASET.bit.GPIO10 = 1;  // Load output latch
   GpioCtrlRegs.GPAMUX1.bit.GPIO10 = 0; // GPIO10 = GPIO10
   GpioCtrlRegs.GPADIR.bit.GPIO6 = 1;   // GPIO10 = output

   GpioCtrlRegs.GPAPUD.bit.GPIO11 = 0;  // Enable pullup on GPIO11
   GpioCtrlRegs.GPAMUX1.bit.GPIO11 = 0; // GPIO11 = GPIO11
   GpioCtrlRegs.GPADIR.bit.GPIO11 = 1;  // GPIO11 = output

   //
   // Enable Trip Zone inputs on GPIO12 - GPIO14
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0;   // Enable pullup on GPIO12
   GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0;   // Enable pullup on GPIO13
   GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0;   // Enable pullup on GPIO14
   GpioCtrlRegs.GPAQSEL1.bit.GPIO12 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL1.bit.GPIO13 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL1.bit.GPIO14 = 3; // asynch input
   InputXbarRegs.INPUT1SELECT = 12;      // GPIO12 = TZ1
   InputXbarRegs.INPUT2SELECT = 13;      // GPIO13 = TZ2
   InputXbarRegs.INPUT3SELECT = 14;      // GPIO14 = TZ3

   //
   // Enable SPI-A on GPIO16 - GPIO19
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0;   // Enable pullup on GPIO16
   GpioCtrlRegs.GPAPUD.bit.GPIO17 = 0;   // Enable pullup on GPIO17
   GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0;   // Enable pullup on GPIO18
   GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0;   // Enable pullup on GPIO19
   GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO17 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // asynch input
   GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3; // asynch input
   GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1;  // GPIO16 = SPICLKA
   GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 1;  // GPIO17 = SPIS0MIA
   GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1;  // GPIO18 = SPICLKA
   GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 1;  // GPIO19 = SPISTEA

   //
   // Enable EQEP1 on GPIO20 - GPIO23
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO20 = 0;   // Enable pullup on GPIO20
   GpioCtrlRegs.GPAPUD.bit.GPIO21 = 0;   // Enable pullup on GPIO21
   GpioCtrlRegs.GPAPUD.bit.GPIO22 = 0;   // Enable pullup on GPIO22
   GpioCtrlRegs.GPAPUD.bit.GPIO23 = 0;   // Enable pullup on GPIO23
   GpioCtrlRegs.GPAQSEL2.bit.GPIO20 = 0; // Synch to SYSCLKOUT
   GpioCtrlRegs.GPAQSEL2.bit.GPIO21 = 0; // Synch to SYSCLKOUT
   GpioCtrlRegs.GPAQSEL2.bit.GPIO22 = 0; // Synch to SYSCLKOUT
   GpioCtrlRegs.GPAQSEL2.bit.GPIO23 = 0; // Synch to SYSCLKOUT
   GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 1;  // GPIO20 = EQEP1A
   GpioCtrlRegs.GPAMUX2.bit.GPIO21 = 1;  // GPIO21 = EQEP1B
   GpioCtrlRegs.GPAMUX2.bit.GPIO22 = 1;  // GPIO22 = EQEP1S
   GpioCtrlRegs.GPAMUX2.bit.GPIO23 = 1;  // GPIO23 = EQEP1I

   //
   // Enable eCAP2 on GPIO24
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0;   // Enable pullup on GPIO24
   GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 0; // Synch to SYSCLKOUT
   InputXbarRegs.INPUT8SELECT = 24;      // GPIO24 = ECAP1

   //
   // Set input qualifcation period for GPIO25 & GPIO26
   //
   GpioCtrlRegs.GPACTRL.bit.QUALPRD3=1;  // Qual period = SYSCLKOUT/2
   GpioCtrlRegs.GPAQSEL2.bit.GPIO25=2;   // 6 samples
   GpioCtrlRegs.GPAQSEL2.bit.GPIO26=2;   // 6 samples

   //
   // Make GPIO25 the input source for XINT1
   //
   GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 0;  // GPIO25 = GPIO25
   GpioCtrlRegs.GPADIR.bit.GPIO25 = 0;   // GPIO25 = input
   GPIO_SetupXINT1Gpio(25);              // XINT1 connected to GPIO25

   //
   // Make GPIO26 the input source for XINT2
   //
   GpioCtrlRegs.GPAMUX2.bit.GPIO26 = 0;  // GPIO26 = GPIO26
   GpioCtrlRegs.GPADIR.bit.GPIO26 = 0;   // GPIO26 = input
   GPIO_SetupXINT2Gpio(26);              // XINT2 connected to GPIO26

   //
   // Make GPIO27 wakeup from HALT/STANDBY Low Power Modes
   //
   GpioCtrlRegs.GPAMUX2.bit.GPIO27 = 0; // GPIO27 = GPIO27
   GpioCtrlRegs.GPADIR.bit.GPIO27 = 0;  // GPIO27 = input
   CpuSysRegs.GPIOLPMSEL0.bit.GPIO27=1; // GPIO27 will wake the device
   CpuSysRegs.LPMCR.bit.QUALSTDBY = 2;  // Qualify GPIO27 by 2 OSCCLK
                                        // cycles before waking the device
                                        // from STANDBY

   //
   // Enable SCI-A on GPIO28 - GPIO29
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0;   // Enable pullup on GPIO28
   GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3; // Asynch input
   GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 1;  // GPIO28 = SCIRXDA
   GpioCtrlRegs.GPAPUD.bit.GPIO29 = 0;   // Enable pullup on GPIO29
   GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 1;  // GPIO29 = SCITXDA

   //
   // Enable CAN-A on GPIO30 - GPIO31
   //
   GpioCtrlRegs.GPAPUD.bit.GPIO30 = 0;   // Enable pullup on GPIO30
   GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 1;  // GPIO30 = CANTXA
   GpioCtrlRegs.GPAPUD.bit.GPIO31 = 0;   // Enable pullup on GPIO31
   GpioCtrlRegs.GPAQSEL2.bit.GPIO31 = 3; // Asynch input
   GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 1;  // GPIO31 = CANRXA

   //
   // Enable I2C-A on GPIO32 - GPIO33
   //
   GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0;   // Enable pullup on GPIO32
   GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1;  // GPIO32 = SDAA
   GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3; // Asynch input
   GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0;   // Enable pullup on GPIO33
   GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3; // Asynch input
   GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1;  // GPIO33 = SCLA

   //
   // Make GPIO34 an input
   //
   GpioCtrlRegs.GPBPUD.bit.GPIO34 = 0;  // Enable pullup on GPIO34
   GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0; // GPIO34 = GPIO34
   GpioCtrlRegs.GPBDIR.bit.GPIO34 = 0;  // GPIO34 = input
   EDIS;
}