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boards/risc-v: ADC support on Espressif devices
Adds adc defconfig and board support for: esp32c3-generic, esp32c6-devkitc and esp32h2-devkit. Signed-off-by: Filipe Cavalcanti <[email protected]>
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‎boards/risc-v/esp32c3/common/include/esp_board_adc.h‎

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/****************************************************************************
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* boards/risc-v/esp32c3/common/include/esp_board_adc.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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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#ifndef __BOARDS_RISCV_ESP32C3_COMMON_INCLUDE_ESP32C3_BOARD_ADC_H
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#define __BOARDS_RISCV_ESP32C3_COMMON_INCLUDE_ESP32C3_BOARD_ADC_H
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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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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: board_adc_init
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*
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* Description:
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* This function configures and initializes the ADC driver for the board.
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* It allocates memory for the ADC device structure, sets up the ADC
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* hardware, and registers the ADC device with the system.
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*
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* Input Parameters:
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* None.
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*
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* Returned Value:
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* Returns zero (OK) on successful initialization and registration of the
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* ADC device; a negated errno value is returned to indicate the nature
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* of any failure.
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*
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****************************************************************************/
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#ifdef CONFIG_ESPRESSIF_ADC
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int board_adc_init(void);
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#endif
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __BOARDS_RISCV_ESP32C3_COMMON_INCLUDE_ESP32C3_BOARD_ADC_H */

‎boards/risc-v/esp32c3/common/src/Make.defs‎

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ifeq ($(CONFIG_ARCH_BOARD_COMMON),y)
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ifeq ($(CONFIG_ESPRESSIF_ADC),y)
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CSRCS += esp_board_adc.c
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endif
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ifeq ($(CONFIG_ESPRESSIF_LEDC),y)
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CSRCS += esp_board_ledc.c
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endif

‎boards/risc-v/esp32c3/common/src/esp_board_adc.c‎

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/****************************************************************************
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* boards/risc-v/esp32c3/common/src/esp_board_adc.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <stdio.h>
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#include <syslog.h>
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#include <nuttx/analog/adc.h>
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#include "espressif/esp_adc.h"
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#include "esp_board_adc.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The number of channels for each ADC */
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#define ADC_MAX_CHANNELS 5
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Select channels to be used for each ADC.
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*
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* GPIOs are fixed for each channel and configured in the lower-half driver.
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*
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* ADC 1
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* Channel: 0 1 2 3 4 5
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* GPIO: 0 1 2 3 4 5
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*
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* On the chanlist arrays below, channels are added +1. Do not change.
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*/
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#ifdef CONFIG_ESPRESSIF_ADC_1
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static const uint8_t g_chanlist_adc1[ADC_MAX_CHANNELS] =
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{
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#ifdef CONFIG_ESPRESSIF_ADC_1_CH0
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1,
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#endif
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#ifdef CONFIG_ESPRESSIF_ADC_1_CH1
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2,
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#endif
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#ifdef CONFIG_ESPRESSIF_ADC_1_CH2
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3,
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#endif
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#ifdef CONFIG_ESPRESSIF_ADC_1_CH3
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4,
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#endif
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#ifdef CONFIG_ESPRESSIF_ADC_1_CH4
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5,
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#endif
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#ifdef CONFIG_ESPRESSIF_ADC_1_CH5
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6,
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#endif
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};
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_adc_init
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*
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* Description:
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* This function configures and initializes the ADC driver for the board.
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* It allocates memory for the ADC device structure, sets up the ADC
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* hardware, and registers the ADC device with the system.
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*
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* Input Parameters:
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* None.
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*
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* Returned Value:
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* Returns zero (OK) on successful initialization and registration of the
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* ADC device; a negated errno value is returned to indicate the nature
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* of any failure.
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*
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****************************************************************************/
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int board_adc_init(void)
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{
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int ret;
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struct adc_dev_s *adcdev;
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adcdev = kmm_malloc(sizeof(struct adc_dev_s));
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if (adcdev == NULL)
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{
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syslog(LOG_ERR, "ERROR: Failed to allocate adc_dev_s instance\n");
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return -ENOMEM;
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}
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memset(adcdev, 0, sizeof(struct adc_dev_s));
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adcdev = esp_adc_initialize(1, g_chanlist_adc1);
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if (adcdev == NULL)
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{
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syslog(LOG_ERR, "ERROR: Failed to initialize ADC1\n");
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return -ENODEV;
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}
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/* Register the ADC driver at "/dev/adcx" */
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ret = adc_register("/dev/adc0", adcdev);
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if (ret < 0)
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{
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kmm_free(adcdev);
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syslog(LOG_ERR, "ERROR: adc_register /dev/adc0 failed: %d\n", ret);
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}
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return ret;
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}

‎boards/risc-v/esp32c3/esp32c3-generic/configs/adc/defconfig‎

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#
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# This file is autogenerated: PLEASE DO NOT EDIT IT.
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#
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# You can use "make menuconfig" to make any modifications to the installed .config file.
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# You can then do "make savedefconfig" to generate a new defconfig file that includes your
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# modifications.
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#
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# CONFIG_NSH_ARGCAT is not set
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# CONFIG_NSH_CMDOPT_HEXDUMP is not set
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CONFIG_ARCH="risc-v"
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CONFIG_ARCH_BOARD="esp32c3-generic"
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CONFIG_ARCH_BOARD_COMMON=y
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CONFIG_ARCH_BOARD_ESP32C3_GENERIC=y
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CONFIG_ARCH_CHIP="esp32c3"
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CONFIG_ARCH_CHIP_ESP32C3_GENERIC=y
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CONFIG_ARCH_INTERRUPTSTACK=1536
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CONFIG_ARCH_RISCV=y
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CONFIG_ARCH_STACKDUMP=y
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CONFIG_BOARDCTL_RESET=y
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CONFIG_BOARD_LOOPSPERMSEC=15000
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CONFIG_BUILTIN=y
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CONFIG_ESPRESSIF_ADC=y
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CONFIG_EXAMPLES_ADC=y
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CONFIG_EXAMPLES_ADC_SWTRIG=y
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CONFIG_FS_PROCFS=y
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CONFIG_IDLETHREAD_STACKSIZE=2048
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CONFIG_INIT_ENTRYPOINT="nsh_main"
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CONFIG_INTELHEX_BINARY=y
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CONFIG_LIBC_PERROR_STDOUT=y
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CONFIG_LIBC_STRERROR=y
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CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
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CONFIG_NSH_ARCHINIT=y
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CONFIG_NSH_BUILTIN_APPS=y
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CONFIG_NSH_FILEIOSIZE=512
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CONFIG_NSH_READLINE=y
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CONFIG_NSH_STRERROR=y
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CONFIG_PREALLOC_TIMERS=0
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CONFIG_RR_INTERVAL=200
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CONFIG_SCHED_BACKTRACE=y
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CONFIG_SCHED_WAITPID=y
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CONFIG_START_DAY=29
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CONFIG_START_MONTH=11
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CONFIG_START_YEAR=2019
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CONFIG_SYSTEM_DUMPSTACK=y
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CONFIG_SYSTEM_NSH=y
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CONFIG_TESTING_GETPRIME=y
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CONFIG_TESTING_OSTEST=y
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CONFIG_UART0_SERIAL_CONSOLE=y

‎boards/risc-v/esp32c3/esp32c3-generic/src/esp32c3_bringup.c‎

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#include "esp_board_i2c.h"
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#include "esp_board_bmp180.h"
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#ifdef CONFIG_ESPRESSIF_ADC
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# include "esp_board_adc.h"
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#endif
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#ifdef CONFIG_WATCHDOG
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# include "espressif/esp_wdt.h"
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#endif
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}
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#endif
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#ifdef CONFIG_ESPRESSIF_ADC
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ret = board_adc_init();
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if (ret < 0)
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{
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syslog(LOG_ERR, "Failed to initialize ADC driver: %d\n", ret);
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}
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#endif
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/* If we got here then perhaps not all initialization was successful, but
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* at least enough succeeded to bring-up NSH with perhaps reduced
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* capabilities.

‎boards/risc-v/esp32c6/common/include/esp_board_adc.h‎

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/****************************************************************************
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* boards/risc-v/esp32c6/common/include/esp_board_adc.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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
10+
* "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
16+
* 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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#ifndef __BOARDS_RISCV_ESP32C6_COMMON_INCLUDE_ESP32C6_BOARD_ADC_H
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#define __BOARDS_RISCV_ESP32C6_COMMON_INCLUDE_ESP32C6_BOARD_ADC_H
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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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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: board_adc_init
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*
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* Description:
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* This function configures and initializes the ADC driver for the board.
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* It allocates memory for the ADC device structure, sets up the ADC
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* hardware, and registers the ADC device with the system.
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*
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* Input Parameters:
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* None.
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*
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* Returned Value:
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* Returns zero (OK) on successful initialization and registration of the
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* ADC device; a negated errno value is returned to indicate the nature
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* of any failure.
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*
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****************************************************************************/
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#ifdef CONFIG_ESPRESSIF_ADC
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int board_adc_init(void);
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#endif
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __BOARDS_RISCV_ESP32C6_COMMON_INCLUDE_ESP32C6_BOARD_ADC_H */

‎boards/risc-v/esp32c6/common/src/Make.defs‎

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ifeq ($(CONFIG_ARCH_BOARD_COMMON),y)
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ifeq ($(CONFIG_ESPRESSIF_ADC),y)
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CSRCS += esp_board_adc.c
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endif
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ifeq ($(CONFIG_ESPRESSIF_LEDC),y)
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CSRCS += esp_board_ledc.c
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endif

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