casaroli commented on code in PR #21516: URL: https://github.com/apache/nuttx/pull/21516#discussion_r4501773822
########## arch/arm/src/imxrt/imxrt_adc_ver3.c: ########## @@ -0,0 +1,413 @@ +/**************************************************************************** + * arch/arm/src/imxrt/imxrt_adc_ver3.c + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <errno.h> +#include <stdint.h> +#include <string.h> + +#include <nuttx/analog/adc.h> +#include <nuttx/analog/ioctl.h> +#include <nuttx/arch.h> +#include <nuttx/irq.h> + +#include "arm_internal.h" +#include "chip.h" +#include "hardware/imxrt_adc.h" +#include "imxrt_periphclks.h" + +#ifdef CONFIG_IMXRT_ADC +#if defined(CONFIG_IMXRT_ADC1) || defined(CONFIG_IMXRT_ADC2) + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ +#define ADC_MAX_CHANNELS 16 + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct imxrt_adc_ver3_s +{ + const struct adc_callback_s *cb; + uint8_t intf; + uint32_t base; + int irq; + uint8_t initialized; + uint8_t nchannels; + uint8_t chanlist[ADC_MAX_CHANNELS]; + uint8_t current; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static int adc_bind(struct adc_dev_s *dev, + const struct adc_callback_s *callback); +static void adc_reset(struct adc_dev_s *dev); +static int adc_setup(struct adc_dev_s *dev); +static void adc_shutdown(struct adc_dev_s *dev); +static void adc_rxint(struct adc_dev_s *dev, bool enable); +static int adc_ioctl(struct adc_dev_s *dev, int cmd, unsigned long arg); +static int adc_interrupt(int irq, void *context, void *arg); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static const struct adc_ops_s g_adcops = +{ + .ao_bind = adc_bind, + .ao_reset = adc_reset, + .ao_setup = adc_setup, + .ao_shutdown = adc_shutdown, + .ao_rxint = adc_rxint, + .ao_ioctl = adc_ioctl, +}; + +#ifdef CONFIG_IMXRT_ADC1 +static struct imxrt_adc_ver3_s g_adcpriv1 = +{ + .intf = 1, + .base = IMXRT_ADC1_BASE, + .irq = IMXRT_IRQ_ADC1 +}; +static struct adc_dev_s g_adcdev1 = +{ + &g_adcops, + &g_adcpriv1 +}; +#endif + +#ifdef CONFIG_IMXRT_ADC2 +static struct imxrt_adc_ver3_s g_adcpriv2 = +{ + .intf = 2, + .base = IMXRT_ADC2_BASE, + .irq = IMXRT_IRQ_ADC2 +}; +static struct adc_dev_s g_adcdev2 = +{ + &g_adcops, + &g_adcpriv2 +}; +#endif + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static inline uint32_t adc_getreg(struct imxrt_adc_ver3_s *priv, + uint32_t offset) +{ + return getreg32(priv->base + offset); +} + +static inline void adc_putreg(struct imxrt_adc_ver3_s *priv, + uint32_t offset, uint32_t value) +{ + putreg32(value, priv->base + offset); +} + +/**************************************************************************** + * Name: adc_bind + * + * Description: + * Bind the upper-half driver callbacks to the lower-half implementation. + * This must be called early in order to receive ADC event notifications. + * + ****************************************************************************/ + +static int adc_bind(struct adc_dev_s *dev, + const struct adc_callback_s *callback) +{ + ((struct imxrt_adc_ver3_s *)dev->ad_priv)->cb = callback; + return OK; +} + +/**************************************************************************** + * Name: adc_reset + * + * Description: + * Reset the ADC device. Called early to initialize the hardware. This + * is called, before adc_setup() and on error conditions. + * + ****************************************************************************/ + +static void adc_reset(struct adc_dev_s *dev) +{ + struct imxrt_adc_ver3_s *priv = dev->ad_priv; + + if (priv->initialized != 0) + { + return; + } + + if (priv->intf == 1) + { + imxrt_clockall_adc1(); + } + else + { + imxrt_clockall_adc2(); + } + + adc_putreg(priv, IMXRT_ADC_CTRL_OFFSET, IMXRT_ADC_CTRL_RST); + adc_putreg(priv, IMXRT_ADC_CTRL_OFFSET, 0); + adc_putreg(priv, IMXRT_ADC_CFG_OFFSET, IMXRT_ADC_CFG_PWREN | + (0x10u << IMXRT_ADC_CFG_PUDLY_SHIFT)); + adc_putreg(priv, IMXRT_ADC_FCTRL0_OFFSET, IMXRT_ADC_FCTRL_FWMARK(0)); + adc_putreg(priv, IMXRT_ADC_IE_OFFSET, 0); + + /* Keep calibration out of the reset path until the gain-result sequence + * (GCC/GCR) is implemented. The SDK examples initialize this way too. + */ + + adc_putreg(priv, IMXRT_ADC_CTRL_OFFSET, IMXRT_ADC_CTRL_ADCEN); +} + +static void adc_program(struct imxrt_adc_ver3_s *priv, uint8_t channel) +{ + uint8_t hardware_channel = channel; + uint32_t channel_type = IMXRT_ADC_CMDL_CTYPE_A; + + /* IDs 0-7 are A0-A7; IDs 8-15 are B0-B7. */ + + if (channel >= 8) + { + hardware_channel = channel - 8; + channel_type = IMXRT_ADC_CMDL_CTYPE_B; + } + + uint32_t cmdl = IMXRT_ADC_CMDL_ADCH(hardware_channel) | + IMXRT_ADC_CMDL_CTYPE(channel_type) | + IMXRT_ADC_CMDL_CSCALE(1); + + adc_putreg(priv, IMXRT_ADC_CMDL1_OFFSET, cmdl); + adc_putreg(priv, IMXRT_ADC_CMDH1_OFFSET, 0); + adc_putreg(priv, IMXRT_ADC_TCTRL0_OFFSET, IMXRT_ADC_TCTRL_TCMD(1)); +} + +/**************************************************************************** + * Name: adc_setup + * + * Description: + * Configure the ADC. This method is called the first time that the ADC + * device is opened. This will occur when the port is first opened. + * This setup includes configuring and attaching ADC interrupts. + * Interrupts are all disabled upon return. + * + ****************************************************************************/ + +static int adc_setup(struct adc_dev_s *dev) +{ + struct imxrt_adc_ver3_s *priv = dev->ad_priv; + int ret; + + if (priv->initialized++ != 0) + { + return OK; + } + + priv->current = 0; + adc_program(priv, priv->chanlist[0]); + ret = irq_attach(priv->irq, adc_interrupt, dev); + if (ret < 0) + { + priv->initialized--; + return ret; + } + + up_enable_irq(priv->irq); + adc_putreg(priv, IMXRT_ADC_SWTRIG_OFFSET, 1); + return OK; +} + +/**************************************************************************** + * Name: adc_shutdown + * + * Description: + * Disable the ADC. This method is called when the ADC device is closed. + * This method reverses the operation the setup method. + * + ****************************************************************************/ + +static void adc_shutdown(struct adc_dev_s *dev) +{ + struct imxrt_adc_ver3_s *priv = dev->ad_priv; + + if (priv->initialized == 0 || --priv->initialized != 0) + { + return; + } + + adc_putreg(priv, IMXRT_ADC_IE_OFFSET, 0); + adc_putreg(priv, IMXRT_ADC_SWTRIG_OFFSET, 0); + up_disable_irq(priv->irq); + irq_detach(priv->irq); +} + +/**************************************************************************** + * Name: adc_rxint + * + * Description: + * Call to enable or disable RX interrupts + * + ****************************************************************************/ + +static void adc_rxint(struct adc_dev_s *dev, bool enable) +{ + struct imxrt_adc_ver3_s *priv = dev->ad_priv; + adc_putreg(priv, IMXRT_ADC_IE_OFFSET, enable ? IMXRT_ADC_IE_FWMIE0 : 0); Review Comment: The CI `check` job fails on this file: nxstyle reports "Missing blank line after declarations" at lines 287, 308 and 328. Fix: add a blank line after the declaration in `adc_rxint()`, `adc_ioctl()` and the loop of `adc_interrupt()`. ########## boards/arm/imxrt/imxrt1180-evk/src/imxrt_bringup.c: ########## @@ -93,6 +96,14 @@ int imxrt_bringup(void) { int ret = OK; +#ifdef CONFIG_IMXRT_ADC + ret = imxrt_adc_initialize(); Review Comment: `imxrt_adc_initialize()` has no prototype in any header, so this call is an implicit declaration. With `CONFIG_IMXRT_ADC1=y` the board does not build: `imxrt_bringup.c:100:9: error: implicit declaration of function 'imxrt_adc_initialize'` (arm-none-eabi-gcc 13.2 with -Werror; GCC 14 fails also without -Werror). Fix: declare `int imxrt_adc_initialize(void);` in `boards/arm/imxrt/imxrt1180-evk/src/imxrt1180-evk.h`. -- This is an automated message from the Apache Git Service. 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