MKM34Z256VLx7 Bare Metal Software Drivers  R4.1.6
Reference Manual
AFE Software Trigger Interrupt Mode

This example shows typical use of the Analogue Front End (AFE) peripheral in software triggered and interrupt conversion mode. The FreeMASTER communication enables monitoring of the measured results as well as performing on-the-fly phase delay updates. The FreeMASTER interfaces via UART2 of the MKM34Z256VLx7 device which is configured for 38400/8-N-1 and handled by interrupts. When using TWR-KM34Z75M board, connect USB port of your PC to the on-board OpenSDA's USB to serial bridge (J27).

Source code:
/******************************************************************************
* (c) Copyright 2010-2015, Freescale Semiconductor Inc.
* ALL RIGHTS RESERVED.
******************************************************************************
* afeisr_test.c
******************************************************************************/
#include "drivers.h"
/* AFE callback declarations */
void afe_ch0_callback (AFE_CH_CALLBACK_TYPE type, int32 result);
void afe_ch1_callback (AFE_CH_CALLBACK_TYPE type, int32 result);
/* static data definitions */
volatile int32 value_ch0 = 0;
volatile int32 value_ch1 = 0;
volatile int16 delay_ch0 = 0;
volatile int16 delay_ch1 = 0;
void main(void)
{
/* initialize SIM module */
/* clock mode 2:1:1, 48MHz */
/* sets 32 KHz RTC Oscillator as the source of the PLL and enable PLL */
/* VREF module must be initialized after SIM module */
VREFL_Trim( 3); /* VREFL trimmed to 0.400 V */
/* AFE channels init */
(AFE_CH_CALLBACK)afe_ch0_callback);
(AFE_CH_CALLBACK)afe_ch1_callback);
/* initialize UART and FreeMASTER */
UART_Init (UART2, UART_MODULE_INTRMODE_CONFIG(38400,24e6));
FMSTR_Init();
/* diagnostic LED */
/* enable interrupts on global level */
/* trigger AFE conversions */
/* main loop */
while (1)
{
/* update delay value */
if (delay_ch1 != 0 || delay_ch0 != 0)
{
AFE_DlyWrite (CH0, delay_ch0);
AFE_DlyWrite (CH1, delay_ch1);
delay_ch0 = 0;
delay_ch1 = 0;
}
}
}
/* AFE callbacks definitions */
void afe_ch0_callback (AFE_CH_CALLBACK_TYPE type, int32 result)
{
if (type == COC_CALLBACK)
{
value_ch0 = result;
GPIO_Tgl (GPIOJ, PIN3);
}
}
void afe_ch1_callback (AFE_CH_CALLBACK_TYPE type, int32 result)
{
if (type == COC_CALLBACK)
{
value_ch1 = result;
FMSTR_Recorder(); /* recorder called at faster interrupt */
GPIO_Tgl (GPIOJ, PIN4);
}
}
Freemaster_cfg.h:
/***************************************************************************/
#ifndef __FREEMASTER_CFG_H
#define __FREEMASTER_CFG_H
/******************************************************************************
* Select interrupt or poll-driven serial communication
*******************************************************************************/
#define FMSTR_LONG_INTR 1 /* complete msg processing in interrupt */
#define FMSTR_SHORT_INTR 0 /* SCI FIFO-queuing done in interrupt */
#define FMSTR_POLL_DRIVEN 0 /* no interrupt needed, polling only */
/******************************************************************************
* Select SCI communication interface
*******************************************************************************/
#define FMSTR_USE_SCI 1 /* To select SCI communication interface */
#define FMSTR_USE_PDBDM 0 /* To select Packet Driven BDM interface */
//#define FMSTR_SCI_BASE 0x4006A000 /* UART0 base on MKM34Z7 */
//#define FMSTR_SCI_BASE 0x4006B000 /* UART1 base on MKM34Z7 */
#define FMSTR_SCI_BASE 0x4006C000 /* UART2 base on MKM34Z7 */
//#define FMSTR_SCI_BASE 0x4006D000 /* UART3 base on MKM34Z7 */
/******************************************************************************
* Input/output communication buffer size
*******************************************************************************/
#define FMSTR_COMM_BUFFER_SIZE 200 /* set to 0 for "automatic" */
/******************************************************************************
* Receive FIFO queue size (use with FMSTR_SHORT_INTR only)
*******************************************************************************/
#define FMSTR_COMM_RQUEUE_SIZE 32 /* set to 0 for "default" */
/******************************************************************************
* Support for Application Commands
*******************************************************************************/
#define FMSTR_USE_APPCMD 0 /* enable/disable App.Commands support */
#define FMSTR_APPCMD_BUFF_SIZE 32 /* App.Command data buffer size */
#define FMSTR_MAX_APPCMD_CALLS 4 /* num. of app.cmd callbacks? (0=disable) */
/******************************************************************************
* Oscilloscope support
*******************************************************************************/
#define FMSTR_USE_SCOPE 1 /* enable/disable scope support */
#define FMSTR_MAX_SCOPE_VARS 8 /* max. number of scope variables (2..8) */
/******************************************************************************
* Recorder support
*******************************************************************************/
#define FMSTR_USE_RECORDER 1 /* enable/disable recorder support */
#define FMSTR_MAX_REC_VARS 8 /* max. num. of recorder variables (2..8) */
/* built-in recorder buffer (use when FMSTR_REC_OWNBUFF is 0) */
#define FMSTR_REC_BUFF_SIZE 8192 /* built-in buffer size */
/* recorder time base, specifies how often the recorder is called */
#define FMSTR_REC_TIMEBASE FMSTR_REC_BASE_MILLISEC(0) /* 0 = "unknown" */
#define FMSTR_REC_FLOAT_TRIG 0 /* enable/disable floating point trigger */
/******************************************************************************
* Target-side address translation (TSA)
*******************************************************************************/
#define FMSTR_USE_TSA 0 /* enable TSA functionality */
#define FMSTR_USE_TSA_SAFETY 0 /* enable access to TSA variables only */
#define FMSTR_USE_TSA_INROM 0 /* TSA tables as const (put to ROM) */
/******************************************************************************
* Enable the byte access to communication buffer. All Cortex M0-based devices
* require this option to be set in order to avoid misaligned access to integer
* parameters which is unsupported on this platform.
*******************************************************************************/
#define FMSTR_BYTE_BUFFER_ACCESS 1
#endif /* __FREEMASTER_CFG_H */
Toolchain support:
IAR EWARM 7.40.7KEIL uVision 5.15CrossWorks 3.6ATOLLIC TrueStudio 5.3.0Kinetis Design Studio 3.0.0