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author | Gregory Nutt <gnutt@nuttx.org> | 2015-02-05 18:01:46 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2015-02-05 18:01:46 -0600 |
commit | 7fb0573936bc89ae57dd3ca4d53ad0bfe49e0551 (patch) | |
tree | 83c986c27a2cc1117174789b2a0fe16414e2bcbf | |
parent | 96e8334a10362689b81db1fe3fabfc5a0b52625a (diff) | |
download | nuttx-7fb0573936bc89ae57dd3ca4d53ad0bfe49e0551.tar.gz nuttx-7fb0573936bc89ae57dd3ca4d53ad0bfe49e0551.tar.bz2 nuttx-7fb0573936bc89ae57dd3ca4d53ad0bfe49e0551.zip |
Forgot to add file in previous commit
-rw-r--r-- | nuttx/configs/tm4c123g-launchpad/src/tm4c_adc.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/nuttx/configs/tm4c123g-launchpad/src/tm4c_adc.c b/nuttx/configs/tm4c123g-launchpad/src/tm4c_adc.c new file mode 100644 index 000000000..1bd06f90c --- /dev/null +++ b/nuttx/configs/tm4c123g-launchpad/src/tm4c_adc.c @@ -0,0 +1,171 @@ +/************************************************************************************ + * configs/tn4c123g-launchpad/tm4c_adc.c + * + * Copyright (C) 2015 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ************************************************************************************/ + +/************************************************************************************ + * Included Files + ************************************************************************************/ + +#include <nuttx/config.h> + +#include <errno.h> +#include <debug.h> + +#include <nuttx/analog/adc.h> + +#include "tiva_adc.h" +#include "tiva_timer.h" +#include "tm4c123g-launchpad.h" + +/************************************************************************************ + * Pre-processor Definitions + ************************************************************************************/ + +#define TIVA_KILO 1000 +#define TIVA_TIME_US (SYSCLK_FREQUENCY/KILO) +#define TIVA_TIME_MS (TIME_US*KILO) + +#define TIVA_TIME_US_TO_TICKS(x) (x*TIME_US) +#define TIVA_TIME_MS_TO_TICKS(x) (x*TIME_MS) + +/************************************************************************************ + * Private Data + ************************************************************************************/ + +/************************************************************************************ + * Private Functions + ************************************************************************************/ + +/************************************************************************************ + * Public Functions + ************************************************************************************/ + +/************************************************************************************ + * Name: board_adc_initialize + * + * Description: + * Initialize and register the ADC driver + * + ************************************************************************************/ + +#ifdef CONFIG_TIVA_ADC +int board_adc_initialize(void) +{ + static bool initialized = false; + struct adc_dev_s *adc; + int ret; + + /* Check if we have already initialized */ + + if (!initialized) + { + /* Call tiva_adcinitialize() to get an instance of the ADC interface */ + + adc = tiva_adc_initialize(0); + if (adc == NULL) + { + adbg("ERROR: Failed to get ADC interface\n"); + return -ENODEV; + } + + /* Register the ADC driver at "/dev/adc0" */ + + ret = adc_register("/dev/adc0", adc); + if (ret < 0) + { + adbg("adc_register failed: %d\n", ret); + return ret; + } + + /* Now we are initialized */ + + initialized = true; + } + + return OK; +} +#endif /* CONFIG_ADC */ + +/************************************************************************************ + * Name: adc_devinit + * + * Description: + * All Tiva architectures must provide the following interface to work with + * examples/adc. + * + ************************************************************************************/ + +#ifdef CONFIG_EXAMPLES_ADC +int adc_devinit(void) +{ +#ifdef CONFIG_TIVA_ADC + return board_adc_initialize(); +#else + return -ENOSYS; +#endif +} +#endif /* CONFIG_EXAMPLES_ADC */ + +#if defined (CONFIG_TIVA_ADC) && defined (CONFIG_TIVA_TIMER) +# if 0 +/************************************************************************************ + * Name: adc_timer_init + * + * Description: + * Inititalize timer specifically for ADC use. + * + ************************************************************************************/ + +TIMER_HANDLE adc_timer_init(void) +{ + struct tiva_gptm32config_s adctimer = + { + .cmn = + { + .gptm = 0; + .mode = TIMER32_MODE_PERIODIC; + .alternate = false; + }; + .config = + { + .flags = TIMER_FLAG_ADCTIMEOUT; + .handler = NULL; + .u.periodic = TIVA_TIME_MS_TO_TICKS(100); // in clock ticks + }; + }; + + return tiva_gptm_configure((const struct tiva_gptmconfig_s *)&adctimer); +} +# endif /* 0 */ +#endif /* defined (CONFIG_TIVA_ADC) && defined (CONFIG_TIVA_TIMER) */ |