/*********************************************************************/
/* Project Name: TPM.mcp */
/* Source fle name: TPM.c */
/*********************************************************************/
/* Copyright (C) 2007 Freescale Semiconductor, Inc. */
/* All Rights Reserved */
/*********************************************************************/
/*********************************************************************/
/* Hands on training for QE128 MCU's */
/* Module: TPWM using timer output compare functionality */
/* The firmware was developed and tested on CodeWarrior 6.0 version */
/* */
/* Description: The timer is configured to count up to 0xFFFF */
/* when an overflow is ocurred PTE0 toggles. */
/*********************************************************************/
/* */
/* Date: 12/03/2007 */
/* Ulises Corrales Salgado */
/* Application Engineer */
/* RTAC Americas */
/*********************************************************************/
#include /* for EnableInterrupts macro */
#include "derivative.h" /* include peripheral declarations */
/*********************************************************************/
/* Function declarations */
/*********************************************************************/
void MCU_Init(void) {
SOPT1 = 0x23; /* Watchdog disable. Stop Mode Enable. Background Pin enable. RESET pin enable */
SCGC1 = 0x80; /* Bus Clock to the TPM3 module is enabled */
SCGC2 = 0x00; /* Disable Bus clock to unused peripherals */
}
void GPIO_Init(void) {
PTCDD = 0x03; /* Configure PTC0, and PTC1 as outputs */
PTCD = 0x00; /* Put 0's in PTC0 port */
}
void TPM_configuration (void) {
TPM3MOD = 0xFFFF; /* The counter counts up to 0xFFFF */
TPM3C0V = 0x0000; /* The channel interrupt will happen when counter matches */
TPM3C0SC = 0x54; /* Channel interrupt enabled and configured as toggle output on compare */
TPM3SC = 0x0F; /* TPM clock source is: Bus rate clock divided by 128 */
}
/*********************************************************************/
/* Main Function */
/*********************************************************************/
void main(void) {
MCU_Init(); /* Function that initializes the MCU */
GPIO_Init(); /* Function that initializes the Ports of the MCU */
TPM_configuration(); /* Function that initializes the TPM module */
EnableInterrupts; /* enable interrupts */
for(;;) {
} /* loop forever */
/* please make sure that you never leave this function */
}
void interrupt VectorNumber_Vtpm3ch0 TPM_ISR(void) {
TPM3C0SC_CH0F; /* Clears timer flag */
TPM3C0SC_CH0F = 0;
PTCD_PTCD1 ^= 1; /* At this point will toggle PTC0 and PTC1. PTC0 will toggle every time */
/* an interrupt is generated because the TPM3C0 pin is in PTC0. PTC1 will */
/* toggle with the instruction PTCD_PTCD1 ^= 1; */
}
