139 lines
5 KiB
C
139 lines
5 KiB
C
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/*******************************************************************************
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Copyright (c) 2017, Infineon Technologies AG **
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All rights reserved. **
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**
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Redistribution and use in source and binary forms, with or without **
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modification,are permitted provided that the following conditions are met: **
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**
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*Redistributions of source code must retain the above copyright notice, **
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this list of conditions and the following disclaimer. **
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*Redistributions in binary form must reproduce the above copyright notice, **
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this list of conditions and the following disclaimer in the documentation **
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and/or other materials provided with the distribution. **
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*Neither the name of the copyright holders nor the names of its contributors **
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may be used to endorse or promote products derived from this software without**
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specific prior written permission. **
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**
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" **
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE **
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE **
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE **
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR **
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF **
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS **
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN **
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CONTRACT, STRICT LIABILITY,OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) **
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE **
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POSSIBILITY OF SUCH DAMAGE. **
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**
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To improve the quality of the software, users are encouraged to share **
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modifications, enhancements or bug fixes with Infineon Technologies AG **
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dave@infineon.com). **
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**
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********************************************************************************/
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/**
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* @file
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* @date 26 June, 2017
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* @version 1.0.0
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*
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* @brief The example shows how to route the state of the BUTTON2 using the ERU
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*
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* History
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* Version 1.0.0 Initial
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*/
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#include "xmc_scu.h"
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#include "xmc_gpio.h"
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#include "xmc_eru.h"
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#define TICKS_PER_SECOND 1000
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#define LED1 P4_0
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#define LED2 P4_1
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#define BUTTON1 P3_4
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const XMC_ERU_ETL_CONFIG_t eru_etl_config =
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{
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.input_a = ERU0_ETL1_INPUTA_SCU_HIB_SR0,
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.source = XMC_ERU_ETL_SOURCE_A,
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.status_flag_mode = XMC_ERU_ETL_STATUS_FLAG_MODE_HWCTRL,
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.edge_detection = XMC_ERU_ETL_EDGE_DETECTION_FALLING
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};
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volatile uint32_t msTicks; /* counts 1ms timeTicks */
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void SysTick_Handler(void)
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{
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msTicks++;
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}
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/*----------------------------------------------------------------------------
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* delays number of tick Systicks (happens every 1 ms)
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*----------------------------------------------------------------------------*/
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static void delay(uint32_t dlyTicks)
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{
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uint32_t curTicks;
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curTicks = msTicks;
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while ((msTicks - curTicks) < dlyTicks)
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{
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__NOP();
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}
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}
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static uint32_t Buttons_GetState(void)
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{
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uint32_t val = 0;
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val = ((uint32_t)~XMC_GPIO_GetInput(BUTTON1) & 0x1U);
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if (XMC_ERU_ETL_GetStatusFlag(XMC_ERU0, 1) != 0)
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{
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val |= 2;
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}
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return val;
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}
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static void led_init(void)
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{
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XMC_GPIO_SetMode(LED1, XMC_GPIO_MODE_OUTPUT_PUSH_PULL);
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XMC_GPIO_SetMode(LED2, XMC_GPIO_MODE_OUTPUT_PUSH_PULL);
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}
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static void button_init(void)
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{
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XMC_GPIO_SetMode(BUTTON1, XMC_GPIO_MODE_INPUT_TRISTATE);
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/* Route BUTTON2(HIB_IO_1) state though ERU */
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XMC_SCU_HIB_EnableHibernateDomain();
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XMC_SCU_HIB_SetPinMode(XMC_SCU_HIB_IO_1, XMC_SCU_HIB_PIN_MODE_INPUT_PULL_NONE);
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XMC_SCU_HIB_SetSR0Input(XMC_SCU_HIB_SR0_INPUT_HIB_IO_1);
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while (XMC_SCU_GetMirrorStatus() != 0)
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{
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/* Wait until update of registers in HIB is done */
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}
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XMC_ERU_ETL_Init(XMC_ERU0, 1, &eru_etl_config);
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}
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int main(void)
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{
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led_init();
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button_init();
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SysTick_Config(SystemCoreClock / TICKS_PER_SECOND);
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/* Loop forever */
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while (1)
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{
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if ((Buttons_GetState() & 0x3) == 0) /* If no button is pressed continue blinking */
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{
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XMC_GPIO_ToggleOutput(LED1); /* Toggle LED */
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delay(500); /* Delay 500ms */
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}
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}
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}
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