156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/****************************************************************************
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* boards/arm/tiva/tm4c123g-launchpad/src/tm4c_adc.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/board.h>
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#include <nuttx/analog/adc.h>
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#include "tiva_adc.h"
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#include "tiva_timer.h"
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#include "tm4c123g-launchpad.h"
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#include "hardware/tiva_pinmap.h"
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#ifdef CONFIG_TIVA_ADC
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tm4c_adc_setup
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*
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* Description:
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* Initialize ADC and register the ADC driver.
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*
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****************************************************************************/
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int tm4c_adc_setup(void)
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{
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#ifdef CONFIG_ADC
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static bool initialized = false;
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int ret;
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uint8_t srate = 0;
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struct tiva_adc_sse_cfg_s sse_cfg0;
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struct tiva_adc_cfg_s adc_cfg;
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struct tiva_adc_step_cfg_s step_cfg[] =
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{
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{
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0,
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0,
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0,
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0,
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(TIVA_ADC_FLAG_TS |
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TIVA_ADC_FLAG_IE |
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TIVA_ADC_FLAG_END),
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0},
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};
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sse_cfg0.priority = 0;
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#ifdef CONFIG_EXAMPLES_ADC_SWTRIG
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sse_cfg0.trigger = TIVA_ADC_TRIG_SW;
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#else
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sse_cfg0.trigger = TIVA_ADC_TRIG_ALWAYS;
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#endif
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adc_cfg.adc = 0;
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adc_cfg.sse[0] = true;
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adc_cfg.sse[1] = false;
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adc_cfg.sse[2] = false;
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adc_cfg.sse[3] = false;
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adc_cfg.ssecfg[0] = sse_cfg0;
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adc_cfg.steps = 1;
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adc_cfg.stepcfg = step_cfg;
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#ifdef CONFIG_EXAMPLES_ADC_SWTRIG
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srate = TIVA_ADC_SAMPLE_RATE_FASTEST;
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#else
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srate = TIVA_ADC_SAMPLE_RATE_SLOWEST;
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#endif
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/* Check if we have already initialized */
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if (!initialized)
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{
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/* Call tiva_adc_initialize to configure an instance of the ADC
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* interface and register it to the character level driver.
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*/
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ret = tiva_adc_initialize(CONFIG_EXAMPLES_ADC_DEVPATH, &adc_cfg,
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TIVA_ADC_CLOCK_MAX, srate);
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if (ret < 0)
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{
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syslog(LOG_ERR, "ERROR: Failed to register /dev/adc0"
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" to character driver: %d\n", ret);
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return ret;
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}
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/* Now we are initialized */
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initialized = true;
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}
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#endif /* CONFIG_ADC */
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return OK;
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}
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/****************************************************************************
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* Name: adc_timer_init
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*
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* Description:
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* Initialize timer specifically for ADC use.
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*
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****************************************************************************/
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/* Tiva timer interface does not currently support user configuration */
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#if 0 /* defined(CONFIG_TIVA_TIMER) */
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TIMER_HANDLE adc_timer_init(void)
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{
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struct tiva_gptm32config_s adctimer =
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{
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.cmn =
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{
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.gptm = 0;
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.mode = TIMER32_MODE_PERIODIC;
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.alternate = false;
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};
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.config =
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{
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.flags = TIMER_FLAG_ADCTIMEOUT;
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.handler = NULL;
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.u.periodic = TIVA_TIME_MS_TO_TICKS(100); /* in clock ticks */
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};
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};
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return tiva_gptm_configure((const struct tiva_gptmconfig_s *)&adctimer);
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}
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#endif /* CONFIG_TIVA_TIMER */
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#endif /* CONFIG_TIVA_ADC */
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