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mtb-example-xmc-ccu8-pwm/main.c
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| /****************************************************************************** | |
| * File Name: main.c | |
| * | |
| * Description: This is the source code for the XMC MCU: CCU8 PWM 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 | |
| *******************************************************************************/ | |
| #define PWM_COMPAREVAL_UPDATE_STEP 2500U | |
| #define PWM_INTERRUPT_MAX_COUNT 50U | |
| #define PWM_PERIOD 65000U | |
| #if (UC_SERIES == XMC14) || (UC_SERIES == XMC43) | |
| #define SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_IRQN CCU8_MODULE_SR1_IRQN | |
| #define SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_HANDLER CCU8_MODULE_SR1_INTERRUPT_HANDLER | |
| #else | |
| #define SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_IRQN CCU8_MODULE_SR0_IRQN | |
| #define SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_HANDLER CCU8_MODULE_SR0_INTERRUPT_HANDLER | |
| #endif | |
| #if (UC_SERIES == XMC13) | |
| #define SYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_0 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_0 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_0 | |
| #define ASYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_2 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_2 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_2 | |
| #define SYMMETRIC_PWM_PERIOD_MATCH_IRQn_PRIORITY 3U | |
| #endif | |
| #if (UC_SERIES == XMC14) | |
| #define SYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_1 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_1 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_1 | |
| #define ASYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_2 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_2 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_2 | |
| #define SYMMETRIC_PWM_PERIOD_MATCH_IRQn_PRIORITY 3U | |
| #endif | |
| #if (UC_SERIES == XMC42) || (UC_SERIES == XMC44) || (UC_SERIES == XMC45) | |
| #define SYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_2 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_2 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_2 | |
| #define ASYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_3 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_3 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_3 | |
| #define SYMMETRIC_PWM_PERIOD_MATCH_IRQn_PRIORITY 10U | |
| #endif | |
| #if (UC_SERIES == XMC43) | |
| #define SYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_1 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_1 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_1 | |
| #define ASYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_3 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_3 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_3 | |
| #define SYMMETRIC_PWM_PERIOD_MATCH_IRQn_PRIORITY 10U | |
| #endif | |
| #if (UC_SERIES == XMC47) || (UC_SERIES == XMC48) | |
| #define SYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_0 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_0 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_0 | |
| #define ASYMMETRIC_PWM_SHADOW_TRANSFER_MASK XMC_CCU8_SHADOW_TRANSFER_SLICE_2 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_DITHER_SLICE_2 | \ | |
| XMC_CCU8_SHADOW_TRANSFER_PRESCALER_SLICE_2 | |
| #define SYMMETRIC_PWM_PERIOD_MATCH_IRQn_PRIORITY 10U | |
| #endif | |
| /* 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 | |
| /******************************************************************************* | |
| * Defines | |
| *******************************************************************************/ | |
| static volatile bool interrupt_handler_flag = false; | |
| /******************************************************************************* | |
| * Global Data | |
| *******************************************************************************/ | |
| /* Interrupt counter */ | |
| volatile uint32_t g_num_period_interrupts; | |
| void SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_HANDLER(void) | |
| { | |
| g_num_period_interrupts++; | |
| XMC_CCU8_SLICE_ClearEvent(SYMMETRIC_PWM_SLICE_HW, XMC_CCU8_SLICE_IRQ_ID_PERIOD_MATCH); | |
| interrupt_handler_flag = true; | |
| } | |
| /******************************************************************************* | |
| * Function Name: main | |
| ******************************************************************************** | |
| * Summary: | |
| * This is the main function. It configures 2 of the CCU8 slices to generate PWM | |
| * output. One CCU8 slice is configured to generate symmetric PWM output and the | |
| * second one is configured to generate asymmetric PWM output. Period match | |
| * interrupt for symmetric PWM slice is enabled. Compare values for both | |
| * symmetric and asymmetric PWM slices are updated after every 20 period match | |
| * interrupts of symmetric PWM slice. User LEDs available on both XMC4700 Relax | |
| * kit and XMC1400 boot kit are configured to output PWM signals. | |
| * | |
| * Output: | |
| * Brightness of USER LEDs vary continuously from LOW to HIGH. | |
| * | |
| * Parameters: | |
| * none | |
| * | |
| * Return: | |
| * int | |
| * | |
| *******************************************************************************/ | |
| int main(void) | |
| { | |
| cy_rslt_t result; | |
| /* Compare value for both symmetric and asymmetric PWMs */ | |
| uint16_t pwm_compareVal = 0U; | |
| #if ENABLE_XMC_DEBUG_PRINT | |
| /* 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 (result != CY_RSLT_SUCCESS) | |
| { | |
| 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 | |
| /* Set interrupt priority */ | |
| NVIC_SetPriority(SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_IRQN, SYMMETRIC_PWM_PERIOD_MATCH_IRQn_PRIORITY); | |
| #if (UC_SERIES == XMC14) | |
| /* Select interrupt source */ | |
| XMC_SCU_SetInterruptControl(SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_IRQN, (XMC_SCU_IRQCTRL_t)((SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_IRQN << 8) | 1U)); | |
| #endif | |
| /* Enable interrupt */ | |
| NVIC_EnableIRQ(SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_IRQN); | |
| for (;;) | |
| { | |
| #if ENABLE_XMC_DEBUG_PRINT | |
| debug_loop_count++; | |
| #endif | |
| /* Wait for 20 symmetric PWM period match events */ | |
| while(g_num_period_interrupts < PWM_INTERRUPT_MAX_COUNT); | |
| #if ENABLE_XMC_DEBUG_PRINT | |
| if (interrupt_handler_flag && (debug_loop_count == DEBUG_LOOP_COUNT_MAX)) | |
| { | |
| /* Print message after the loop has run DEBUG_LOOP_COUNT_MAX times and SYMMETRIC_PWM_SLICE_PERIOD_MATCH_EVENT_HANDLER has occurred */ | |
| printf("20 symmetric PWM period match events passed\r\n"); | |
| } | |
| #endif | |
| /* Reset interrupt counter */ | |
| g_num_period_interrupts = 0; | |
| /* Update compare value for symmetric PWM */ | |
| XMC_CCU8_SLICE_SetTimerCompareMatchChannel1(SYMMETRIC_PWM_SLICE_HW, pwm_compareVal); | |
| XMC_CCU8_EnableShadowTransfer(CCU8_MODULE_HW, SYMMETRIC_PWM_SHADOW_TRANSFER_MASK); | |
| #if ENABLE_XMC_DEBUG_PRINT | |
| if (debug_loop_count == DEBUG_LOOP_COUNT_MAX) | |
| { | |
| printf("Updated compare value for symmetric PWM\r\n"); | |
| } | |
| #endif | |
| /* Update compare value for asymmetric PWM channels */ | |
| XMC_CCU8_SLICE_SetTimerCompareMatchChannel1(ASYMMETRIC_PWM_SLICE_HW, pwm_compareVal); | |
| XMC_CCU8_SLICE_SetTimerCompareMatchChannel2(ASYMMETRIC_PWM_SLICE_HW, pwm_compareVal); | |
| XMC_CCU8_EnableShadowTransfer(CCU8_MODULE_HW, ASYMMETRIC_PWM_SHADOW_TRANSFER_MASK); | |
| #if ENABLE_XMC_DEBUG_PRINT | |
| if (debug_loop_count == DEBUG_LOOP_COUNT_MAX) | |
| { | |
| printf("Updated compare value for asymmetric PWM channels\r\n"); | |
| } | |
| #endif | |
| /* Increment PWM compare value */ | |
| pwm_compareVal += PWM_COMPAREVAL_UPDATE_STEP; | |
| if (pwm_compareVal > PWM_PERIOD) | |
| { | |
| pwm_compareVal = 0U; | |
| } | |
| } | |
| } | |
| /* [] END OF FILE */ |