190 lines
6.1 KiB
C
190 lines
6.1 KiB
C
/*
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* Copyright (C) 2015 Infineon Technologies AG. All rights reserved.
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*
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* Infineon Technologies AG (Infineon) is supplying this software for use with
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* Infineon's microcontrollers.
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* This file can be freely distributed within development tools that are
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* supporting such microcontrollers.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
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* OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
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* INFINEON SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL,
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* OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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*
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*/
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/**
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* @file
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* @date 8 October, 2015
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* @version 1.0.0
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*
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* @brief XMC4800 Relax Kit board VADC measurement example
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*
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* This is an example depicting usage of the ADC driver.
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* The ADC driver is used to configure various functional blocks of the
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* peripheral, setting up of a single entry queue and converting the lone
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* entry by means of a software generated queue conversion request periodically
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* in the SysTick handler. The SysTick timer is configured to fire every 10ms.
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* The results are send via UART and can be visualize in a PC using a terminal program
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*
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* History <br>
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*
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* Version 1.0.0 Initial <br>
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*
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*/
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/*********************************************************************************************************************
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* HEADER FILES
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********************************************************************************************************************/
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#include <stdio.h>
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#include <xmc_vadc.h>
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#include <xmc_scu.h>
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#include <xmc_gpio.h>
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#include <xmc_uart.h>
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/*********************************************************************************************************************
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* MACROS
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********************************************************************************************************************/
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/* Pin P14.1 is measured and converted */
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#define CHANNEL_NUMBER (7U)
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#define VADC_GROUP_PTR (VADC_G0)
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/* Register result */
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#define RES_REG_NUMBER (0)
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/* UART pins */
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#define UART_TX P1_5
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#define UART_RX P1_4
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/* ADC Conversion rate (ms) */
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#define TICK_PERIOD (10U)
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/*********************************************************************************************************************
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* GLOBAL DATA
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********************************************************************************************************************/
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/* Initialization data of VADC Global resources */
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XMC_VADC_GLOBAL_CONFIG_t g_global_config =
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{
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.clock_config =
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{
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.analog_clock_divider = 3,
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.msb_conversion_clock = 0,
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.arbiter_clock_divider = 1
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},
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};
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/* Initialization data of a VADC group */
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XMC_VADC_GROUP_CONFIG_t g_group_config =
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{
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.class1 =
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{
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.conversion_mode_standard = XMC_VADC_CONVMODE_12BIT,
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.sample_time_std_conv = 3U,
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}
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};
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XMC_VADC_QUEUE_CONFIG_t g_queue_config;
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/* Channel configuration data */
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XMC_VADC_CHANNEL_CONFIG_t g_channel_config =
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{
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.input_class = XMC_VADC_CHANNEL_CONV_GROUP_CLASS1,
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.result_reg_number = RES_REG_NUMBER,
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.alias_channel = XMC_VADC_CHANNEL_ALIAS_DISABLED
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};
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/* Result configuration data */
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XMC_VADC_RESULT_CONFIG_t g_result_config =
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{
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.wait_for_read_mode = true
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};
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/* Queue Entry */
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XMC_VADC_QUEUE_ENTRY_t g_queue_entry =
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{
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.channel_num = CHANNEL_NUMBER,
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.refill_needed = true, /* Refill is needed */
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.generate_interrupt = true, /* Interrupt generation is needed */
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.external_trigger = true /* External trigger is required */
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};
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XMC_UART_CH_CONFIG_t uart_config =
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{
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.data_bits = 8U,
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.stop_bits = 1U,
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.baudrate = 115200U
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};
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/*********************************************************************************************************************
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* MAIN APPLICATION
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********************************************************************************************************************/
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/* Result handler */
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void VADC0_G0_0_IRQHandler(void)
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{
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XMC_VADC_RESULT_SIZE_t result;
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/* Read the result register */
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result = XMC_VADC_GROUP_GetResult(VADC_GROUP_PTR, RES_REG_NUMBER);
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/* Acknowledge the interrupt */
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XMC_VADC_GROUP_QueueClearReqSrcEvent(VADC_GROUP_PTR);
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printf("ADC: %d\r\n", result);
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}
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/* Trigger periodically a conversion request */
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void SysTick_Handler(void)
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{
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/* Trigger next conversion */
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XMC_VADC_GROUP_QueueTriggerConversion(VADC_GROUP_PTR);
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}
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/* Application entry point */
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int main(void)
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{
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XMC_UART_CH_Init(XMC_UART0_CH0, &uart_config);
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XMC_UART_CH_SetInputSource(XMC_UART0_CH0, XMC_UART_CH_INPUT_RXD, USIC0_C0_DX0_P1_4);
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XMC_UART_CH_Start(XMC_UART0_CH0);
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XMC_GPIO_SetMode(UART_TX, XMC_GPIO_MODE_OUTPUT_PUSH_PULL_ALT2);
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XMC_GPIO_SetMode(UART_RX, XMC_GPIO_MODE_INPUT_TRISTATE);
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/* Initialize the VADC global registers */
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XMC_VADC_GLOBAL_Init(VADC, &g_global_config);
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/* Configure a conversion kernel */
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XMC_VADC_GROUP_Init(VADC_GROUP_PTR, &g_group_config);
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XMC_VADC_GROUP_QueueInit(VADC_GROUP_PTR, &g_queue_config);
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/* Configure a channel belonging to the aforesaid conversion kernel */
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XMC_VADC_GROUP_ChannelInit(VADC_GROUP_PTR,CHANNEL_NUMBER, &g_channel_config);
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/* Configure a result resource belonging to the aforesaid conversion kernel */
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XMC_VADC_GROUP_ResultInit(VADC_GROUP_PTR, RES_REG_NUMBER, &g_result_config);
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/* Add the channel to the queue */
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XMC_VADC_GROUP_QueueInsertChannel(VADC_GROUP_PTR, g_queue_entry);
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/* Connect Request Source Event to the NVIC nodes */
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XMC_VADC_GROUP_QueueSetReqSrcEventInterruptNode(VADC_GROUP_PTR, XMC_VADC_SR_GROUP_SR0);
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/* Enable IRQ */
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NVIC_SetPriority(VADC0_G0_0_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), 63, 0));
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NVIC_EnableIRQ(VADC0_G0_0_IRQn);
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/* Enable the analog converters */
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XMC_VADC_GROUP_SetPowerMode(VADC_GROUP_PTR, XMC_VADC_GROUP_POWERMODE_NORMAL);
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/* Perform calibration of the converter */
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XMC_VADC_GLOBAL_StartupCalibration(VADC);
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/* System timer configuration */
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SysTick_Config(SystemCoreClock / TICK_PERIOD);
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while(1);
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}
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