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//
// TMDX ALPHA RELEASE
// Intended for product evaluation purposes
//
//###########################################################################
//
// FILE: DSP28_EvPwm.c
//
// TITLE: DSP28 Event Manager PWM Generation.
//
// ASSUMPTIONS:
//
// This program requires the DSP28 header files. To compile the
// program as is, it should reside in the DSP28/examples/ev_pwm
// sub-directory.
//
// As supplied, this project is configured for "boot to H0" operation.
//
// DESCRIPTION:
//
// This program sets up the EV timers (TIMER1, TIMER2, TIMER3 and TIMER4)
// to generate T1PWM, T2PWM, T3PWM, T4PWM and PWM1-12 waveforms.
// The user can then observe the waveforms using an scope.
//
//
//###########################################################################
//
// Ver | dd mmm yyyy | Who | Description of changes
// =====|=============|======|===============================================
// 0.58| 19 Jul 2002 | L.H. | First Release
//###########################################################################
// Step 0. Include required header files
// DSP28_Device.h: device specific definitions #include statements for
// all of the peripheral .h definition files.
// DSP28_Example.h is specific for the given example.
#include "DSP28_Device.h"
// Prototype statements for functions found within this file.
// Global counts used in this example
void main(void)
{
// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
// This function is found in the DSP28_SysCtrl.c file.
InitSysCtrl();
// Step 2. Select GPIO for the device or for the specific application:
// This function is found in the DSP28_Gpio.c file.
// InitGpio(); // Skip for this test
// Initalize GPIO for this test here
EALLOW;
// Enable PWM pins
GpioMuxRegs.GPAMUX.all = 0x00FF; // EVA PWM 1-6 pins
GpioMuxRegs.GPBMUX.all = 0x00FF; // EVB PWM 7-12 pins
EDIS;
// Step 3. Initialize PIE vector table:
// The PIE vector table is initialized with pointers to shell Interrupt
// Service Routines (ISR). The shell routines are found in DSP28_DefaultIsr.c.
// Insert user specific ISR code in the appropriate shell ISR routine in
// the DSP28_DefaultIsr.c file.
// Disable and clear all CPU interrupts:
DINT;
IER = 0x0000;
IFR = 0x0000;
// Initialize Pie Control Registers To Default State:
// This function is found in the DSP28_PieCtrl.c file.
InitPieCtrl();
// Initialize the PIE Vector Table To a Known State:
// This function is found in DSP28_PieVect.c.
// This function populates the PIE vector table with pointers
// to the shell ISR functions found in DSP28_DefaultIsr.c.
InitPieVectTable();
// Step 4. Initialize all the Device Peripherals to a known state:
// This function is found in DSP28_InitPeripherals.c
// InitPeripherals();
// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:
// EVA Configure T1PWM, T2PWM, PWM1-PWM6
// Step 1 Initalize the timers
// Initalize EVA Timer1
EvaRegs.T1PR = 0xFFFF; // Timer1 period
EvaRegs.T1CMPR = 0x3C00; // Timer1 compare
EvaRegs.T1CNT = 0x0000; // Timer1 counter
// TMODE = continuous up/down
// Timer enable
// Timer compare enable
EvaRegs.T1CON.all = 0x1042;
// Initalize EVA Timer2
EvaRegs.T2PR = 0x0FFF; // Timer2 period
EvaRegs.T2CMPR = 0x03C0; // Timer2 compare
EvaRegs.T2CNT = 0x0000; // Timer2 counter
// TMODE = continuous up/down
// Timer enable
// Timer compare enable
EvaRegs.T2CON.all = 0x1042;
// Step 2 Setup T1PWM and T2PWM
// Drive T1/T2 PWM by compare logic
EvaRegs.GPTCONA.bit.TCOMPOE = 1;
// Polarity of GP Timer 1 Compare = Active low
EvaRegs.GPTCONA.bit.T1PIN = 1;
// Polarity of GP Timer 2 Compare = Active high
EvaRegs.GPTCONA.bit.T2PIN = 2;
// Step 3 Enable compare for PWM1-PWM6
EvaRegs.CMPR1 = 0x0C00;
EvaRegs.CMPR2 = 0x3C00;
EvaRegs.CMPR3 = 0xFC00;
// Compare action control. Action that takes place
// on a cmpare event
// output pin 1 CMPR1 - active high
// output pin 2 CMPR1 - active low
// output pin 3 CMPR2 - active high
// output pin 4 CMPR2 - active low
// output pin 5 CMPR3 - active high
// output pin 6 CMPR3 - active low
EvaRegs.ACTRA.all = 0x0666;
EvaRegs.DBTCONA.all = 0x0000; // Disable deadband
EvaRegs.COMCONA.all = 0xA600;
// EVB Configure T3PWM, T4PWM and PWM7-PWM12
// Step 1 - Initalize the Timers
// Initalize EVB Timer3
// Timer3 controls T3PWM and PWM7-12
EvbRegs.T3PR = 0xFFFF; // Timer3 period
EvbRegs.T3CMPR = 0x3C00; // Timer3 compare
EvbRegs.T3CNT = 0x0000; // Timer3 counter
// TMODE = continuous up/down
// Timer enable
// Timer compare enable
EvbRegs.T3CON.all = 0x1042;
// Initalize EVB Timer4
// Timer4 controls T4PWM
EvbRegs.T4PR = 0x00FF; // Timer4 period
EvbRegs.T4CMPR = 0x0030; // Timer4 compare
EvbRegs.T4CNT = 0x0000; // Timer4 counter
// TMODE = continuous up/down
// Timer enable
// Timer compare enable
EvbRegs.T4CON.all = 0x1042;
// Step 2 Setup T3PWM and T4PWM
// Drive T3/T4 PWM by compare logic
EvbRegs.GPTCONB.bit.TCOMPOE = 1;
// Polarity of GP Timer 3 Compare = Active low
EvbRegs.GPTCONB.bit.T3PIN = 1;
// Polarity of GP Timer 4 Compare = Active high
EvbRegs.GPTCONB.bit.T4PIN = 2;
// Step 3 Enable compare for PWM7-PWM12
EvbRegs.CMPR4 = 0x0C00;
EvbRegs.CMPR5 = 0x3C00;
EvbRegs.CMPR6 = 0xFC00;
// Compare action control. Action that takes place
// on a cmpare event
// output pin 1 CMPR4 - active high
// output pin 2 CMPR4 - active low
// output pin 3 CMPR5 - active high
// output pin 4 CMPR5 - active low
// output pin 5 CMPR6 - active high
// output pin 6 CMPR6 - active low
EvbRegs.ACTRB.all = 0x0666;
EvbRegs.DBTCONB.all = 0x0000; // Disable deadband
EvbRegs.COMCONB.all = 0xA600;
// Step 6. IDLE loop. Just sit and loop forever:
// PWM pins can be observed with a scope.
for(;;);
}
// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:
// If local ISRs are used, reassign vector addresses in vector table as
// shown in Step 5
//===========================================================================
// No more.
//===========================================================================
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