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mtb-example-xmc-ccu8-timer-concatenation/main.c
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/****************************************************************************** | |
* File Name: main.c | |
* | |
* Description: This is the source code for the XMC MCU: CCU8 Timer Concatenation | |
* Example for ModusToolbox. | |
* | |
* Related Document: See README.md | |
* | |
****************************************************************************** | |
* | |
* Copyright (c) 2015-2022, Infineon Technologies AG | |
* All rights reserved. | |
* | |
* Boost Software License - Version 1.0 - August 17th, 2003 | |
* | |
* Permission is hereby granted, free of charge, to any person or organization | |
* obtaining a copy of the software and accompanying documentation covered by | |
* this license (the "Software") to use, reproduce, display, distribute, | |
* execute, and transmit the Software, and to prepare derivative works of the | |
* Software, and to permit third-parties to whom the Software is furnished to | |
* do so, all subject to the following: | |
* | |
* The copyright notices in the Software and this entire statement, including | |
* the above license grant, this restriction and the following disclaimer, | |
* must be included in all copies of the Software, in whole or in part, and | |
* all derivative works of the Software, unless such copies or derivative | |
* works are solely in the form of machine-executable object code generated by | |
* a source language processor. | |
* | |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT | |
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE | |
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, | |
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
* DEALINGS IN THE SOFTWARE. | |
* | |
*****************************************************************************/ | |
#include <stdio.h> | |
#include "cybsp.h" | |
#include "cy_utils.h" | |
#include "cy_retarget_io.h" | |
/******************************************************************************* | |
* Macros | |
*******************************************************************************/ | |
/* Declarations for LED toggle */ | |
#define USER_LED_TOGGLE_PERIOD_US (1000000U) | |
/* Define macro to enable/disable printing of debug messages */ | |
#define ENABLE_XMC_DEBUG_PRINT (0) | |
/* Define macro to set the loop count before printing debug messages */ | |
#if ENABLE_XMC_DEBUG_PRINT | |
#define DEBUG_LOOP_COUNT_MAX (1U) | |
#endif | |
/******************************************************************************* | |
* Global variables | |
*******************************************************************************/ | |
static volatile bool debug_flag = false; | |
/******************************************************************************* | |
* Function Name: sys_now | |
******************************************************************************** | |
* Summary: | |
* Returns the current time in microseconds. | |
* | |
* Parameters: | |
* none | |
* | |
* Return: | |
* uint32_t: the current time in microseconds | |
* | |
*******************************************************************************/ | |
static uint32_t sys_now(void) | |
{ | |
uint32_t retval; | |
uint16_t timer_h0; | |
uint16_t timer_l; | |
uint16_t timer_h1; | |
/* This loop ensures that the function returns the latest time | |
and maintains accuracy */ | |
do | |
{ | |
timer_h0 = XMC_CCU8_SLICE_GetTimerValue(COUNTER_H_HW); | |
timer_l = XMC_CCU8_SLICE_GetTimerValue(COUNTER_L_HW); | |
timer_h1 = XMC_CCU8_SLICE_GetTimerValue(COUNTER_H_HW); | |
retval = (uint32_t)(timer_h1 << 16) | (uint32_t)timer_l; | |
} | |
while (timer_h0 != timer_h1); | |
/* Flag is enabled when the function returns the latest time | |
and maintains accuracy */ | |
debug_flag = true; | |
return retval; | |
} | |
/******************************************************************************* | |
* Function Name: main | |
******************************************************************************** | |
* Summary: | |
* This is the main function. It performs initial setup of the device, | |
* and starts the CCU8 slices. The counter slices input signal used to count up | |
* is configured. The main while loop toggles CYBSP_USER_LED every | |
* 'USER_LED_TOGGLE_PERIOD_US' microseconds. | |
* | |
* Parameters: | |
* none | |
* | |
* Return: | |
* int | |
* | |
*******************************************************************************/ | |
int main(void) | |
{ | |
cy_rslt_t result; | |
#if ENABLE_XMC_DEBUG_PRINT | |
/* Assign false to disable printing of debug messages*/ | |
static volatile bool debug_printf = true; | |
/* Initialize the current loop count to zero */ | |
static uint32_t debug_loop_count = 0; | |
#endif | |
/* Initialize the device and board peripherals */ | |
result = cybsp_init(); | |
if (CY_RSLT_SUCCESS != result) | |
{ | |
CY_ASSERT(0); | |
} | |
/* Initialize retarget-io to use the debug UART port */ | |
cy_retarget_io_init(CYBSP_DEBUG_UART_HW); | |
#if ENABLE_XMC_DEBUG_PRINT | |
printf("Initialization done\r\n"); | |
#endif | |
while (1) | |
{ | |
uint32_t ref_time = sys_now(); | |
#if ENABLE_XMC_DEBUG_PRINT | |
debug_loop_count++; | |
#endif | |
/* Wait till a USER_LED_TOGGLE_PERIOD_US is elapsed since the start of the loop */ | |
while ((sys_now() - ref_time) < USER_LED_TOGGLE_PERIOD_US); | |
#if ENABLE_XMC_DEBUG_PRINT | |
if(debug_flag && debug_printf && (debug_loop_count == DEBUG_LOOP_COUNT_MAX)) | |
{ | |
debug_printf = false; | |
/* Print message after debug_flag is triggered | |
* and the loop has run DEBUG_LOOP_COUNT_MAX times */ | |
printf("USER_LED_TOGGLE_PERIOD_US is elapsed since the start of the loop\r\n"); | |
} | |
#endif | |
/* Toggle the USER LED state */ | |
XMC_GPIO_ToggleOutput(CYBSP_USER_LED_PORT, CYBSP_USER_LED_PIN); | |
} | |
} | |
/* [] END OF FILE */ |