169 lines
4.9 KiB
C
169 lines
4.9 KiB
C
/*
|
|
* Copyright (C) 2014 Infineon Technologies AG. All rights reserved.
|
|
*
|
|
* Infineon Technologies AG (Infineon) is supplying this software for use with
|
|
* Infineon's microcontrollers.
|
|
* This file can be freely distributed within development tools that are
|
|
* supporting such microcontrollers.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
|
|
* OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
|
|
* INFINEON SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL,
|
|
* OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @date 04 Dec, 2014
|
|
* @version 1.0.0
|
|
*
|
|
* @brief DAC demo example
|
|
*
|
|
* This example demonstrate two of five DAC configurations.
|
|
* It generates an analog sine wave on DAC0 Output and
|
|
* a static analog value on DAC1 Output.
|
|
* e.g. XMC44/45 P14.8 (DAC0), P14.9 (DAC1)
|
|
*
|
|
* To change the frequency and amplitude the function DAC_Update() is called
|
|
* periodically. DAC_Update() only has to be called to change frequency or
|
|
* amplitude not for basic sine wave generation.
|
|
*
|
|
* The value in beats[index] defines after how many function calls
|
|
* the frequency and amplitude will be updated. The value in melody[index]
|
|
* defines the new frequency and if the amplitude have to be set to minimum.
|
|
*
|
|
* After program start, the two analog values can be displayed via oscilloscope
|
|
* e.g. XMC44/45 P14.8 (DAC0), P14.9 (DAC1).
|
|
* DAC0 (P14.8) is a static value of 1.4V
|
|
* DAC1 (P14.9) is a sine wave with changing frequency
|
|
*
|
|
* This example is designed for:
|
|
* CPU Board XMC4500 General Purpose (CPU_45A-V3)
|
|
* CPU Board XMC4400 General Purpose (CPU_44A-V2)
|
|
*
|
|
* History <br>
|
|
*
|
|
* Version 1.0.0 Initial <br>
|
|
*
|
|
*/
|
|
|
|
|
|
#include <xmc_dac.h>
|
|
#include <xmc_scu.h>
|
|
|
|
#define R (20000U)
|
|
#define ARRAY_SIZE (48U)
|
|
#define TICKS_PER_SECOND (100U)
|
|
|
|
|
|
const uint16_t melody[ARRAY_SIZE] =
|
|
{
|
|
660U, R, 660U, R, 660U, R, 510U, R,
|
|
660U, R, 770U, R, 380U, R, 510U, R,
|
|
380U, R, 320U, R, 440U, R, 480U, R,
|
|
450U, R, 430U, R, 380U, R, 660U, R,
|
|
760U, R, 860U, R, 700U, R, 760U, R,
|
|
660U, R, 520U, R, 580U, R, 480U, R
|
|
};
|
|
|
|
|
|
const uint16_t beats[ARRAY_SIZE] =
|
|
{
|
|
10U, 15U, 10U, 30U, 10U, 30U, 10U, 10U,
|
|
10U, 30U, 10U, 55U, 10U, 57U, 10U, 45U,
|
|
10U, 40U, 10U, 50U, 10U, 30U, 8U, 33U,
|
|
10U, 15U, 10U, 30U, 10U, 20U, 8U, 20U,
|
|
5U, 15U, 10U, 30U, 8U, 15U, 5U, 35U,
|
|
8U, 30U, 8U, 15U, 8U, 15U, 8U, 50U
|
|
};
|
|
|
|
|
|
XMC_DAC_CH_CONFIG_t const ch_config0=
|
|
{
|
|
.output_offset = 0U,
|
|
.data_type = XMC_DAC_CH_DATA_TYPE_SIGNED,
|
|
.output_scale = XMC_DAC_CH_OUTPUT_SCALE_MUL_64,
|
|
.output_negation = XMC_DAC_CH_OUTPUT_NEGATION_DISABLED,
|
|
};
|
|
|
|
XMC_DAC_CH_CONFIG_t const ch_config1=
|
|
{
|
|
.output_offset = 0U,
|
|
.data_type = XMC_DAC_CH_DATA_TYPE_SIGNED,
|
|
.output_scale = XMC_DAC_CH_OUTPUT_SCALE_NONE,
|
|
.output_negation = XMC_DAC_CH_OUTPUT_NEGATION_DISABLED,
|
|
};
|
|
|
|
const uint8_t pattern[] = XMC_DAC_PATTERN_SINE;
|
|
|
|
void DacUpdate(void);
|
|
|
|
void SysTick_Handler(void)
|
|
{
|
|
DacUpdate();
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
/* API to initial DAC Module*/
|
|
XMC_DAC_CH_Init(XMC_DAC0, 0U, &ch_config0);
|
|
XMC_DAC_CH_Init(XMC_DAC0, 1U, &ch_config1);
|
|
|
|
/* API to initial DAC in Pattern mode. When using a predefined pattern a type cast avoid warnings */
|
|
XMC_DAC_CH_StartPatternMode(XMC_DAC0, 0U, pattern, XMC_DAC_CH_PATTERN_SIGN_OUTPUT_DISABLED, XMC_DAC_CH_TRIGGER_INTERNAL, 500U);
|
|
|
|
/* API to initial DAC in SingleValue mode */
|
|
XMC_DAC_CH_StartSingleValueMode(XMC_DAC0, 1U);
|
|
|
|
/* API to write a value into DAC Output */
|
|
XMC_DAC_CH_Write(XMC_DAC0, 1, 0x1ffU);
|
|
|
|
/* System timer configuration */
|
|
SysTick_Config(SystemCoreClock / TICKS_PER_SECOND);
|
|
|
|
while(1)
|
|
{
|
|
}
|
|
}
|
|
|
|
|
|
/*------------------------------------------------------------------------------------------------------------------
|
|
* void DacUpdate(void)
|
|
*
|
|
* Updates the DAC frequency after beats[index] function calls.
|
|
* New frequency value is melody[index].
|
|
*
|
|
* e.g.:
|
|
* index=0, beats[index]= 10, melody[index] =660 and Dac_Update is called after 10ms:
|
|
* Sine wave with 660Hz will be displayed for 100ms.
|
|
*
|
|
* If melody[index] =R, frequency is shifted out of audible area and amplitude is set to minimum.
|
|
*
|
|
* ------------------------------------------------------------------------------------------------------------------*/
|
|
void DacUpdate(void)
|
|
{
|
|
static uint8_t function_calls = 0;
|
|
static uint8_t index = 0;
|
|
|
|
function_calls++;
|
|
|
|
/* check if function_call limit is reached.*/
|
|
if (function_calls >= beats[index])
|
|
{
|
|
function_calls = 0;
|
|
index++;
|
|
|
|
/* avoid array overflow.*/
|
|
if(index >= ARRAY_SIZE)
|
|
{
|
|
index = 0;
|
|
}
|
|
|
|
/* update frequency */
|
|
XMC_DAC_CH_SetPatternFrequency(XMC_DAC0, 0, melody[index]);
|
|
|
|
}
|
|
}
|
|
|