276 lines
6.9 KiB
C
276 lines
6.9 KiB
C
/*
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* Copyright (c) 2017-2018, NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <adc.h>
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#include <fsl_adc16.h>
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#define SYS_LOG_LEVEL CONFIG_SYS_LOG_ADC_LEVEL
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#include <logging/sys_log.h>
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#define ADC_CONTEXT_USES_KERNEL_TIMER
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#include "adc_context.h"
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struct mcux_adc16_config {
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ADC_Type *base;
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void (*irq_config_func)(struct device *dev);
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};
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struct mcux_adc16_data {
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struct device *dev;
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struct adc_context ctx;
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u16_t *buffer;
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u16_t *repeat_buffer;
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u32_t channels;
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u8_t channel_id;
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};
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static int mcux_adc16_channel_setup(struct device *dev,
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const struct adc_channel_cfg *channel_cfg)
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{
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u8_t channel_id = channel_cfg->channel_id;
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if (channel_id > (ADC_SC1_ADCH_MASK >> ADC_SC1_ADCH_SHIFT)) {
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SYS_LOG_ERR("Channel %d is not valid", channel_id);
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return -EINVAL;
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}
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if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
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SYS_LOG_ERR("Invalid channel acquisition time");
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return -EINVAL;
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}
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if (channel_cfg->differential) {
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SYS_LOG_ERR("Differential channels are not supported");
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return -EINVAL;
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}
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if (channel_cfg->gain != ADC_GAIN_1) {
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SYS_LOG_ERR("Invalid channel gain");
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return -EINVAL;
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}
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if (channel_cfg->reference != ADC_REF_INTERNAL) {
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SYS_LOG_ERR("Invalid channel reference");
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return -EINVAL;
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}
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return 0;
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}
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static int start_read(struct device *dev, const struct adc_sequence *sequence)
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{
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const struct mcux_adc16_config *config = dev->config->config_info;
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struct mcux_adc16_data *data = dev->driver_data;
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adc16_hardware_average_mode_t mode;
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int error;
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if (sequence->resolution != 12) {
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SYS_LOG_ERR("Invalid resolution");
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return -EINVAL;
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}
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switch (sequence->oversampling) {
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case 0:
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mode = kADC16_HardwareAverageDisabled;
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break;
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case 2:
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mode = kADC16_HardwareAverageCount4;
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break;
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case 3:
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mode = kADC16_HardwareAverageCount8;
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break;
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case 4:
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mode = kADC16_HardwareAverageCount16;
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break;
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case 5:
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mode = kADC16_HardwareAverageCount32;
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break;
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default:
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SYS_LOG_ERR("Invalid oversampling");
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return -EINVAL;
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}
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ADC16_SetHardwareAverage(config->base, mode);
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data->buffer = sequence->buffer;
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data->repeat_buffer = sequence->buffer;
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adc_context_start_read(&data->ctx, sequence);
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error = adc_context_wait_for_completion(&data->ctx);
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adc_context_release(&data->ctx, error);
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return error;
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}
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static int mcux_adc16_read(struct device *dev,
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const struct adc_sequence *sequence)
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{
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struct mcux_adc16_data *data = dev->driver_data;
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adc_context_lock(&data->ctx, false, NULL);
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return start_read(dev, sequence);
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}
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#ifdef CONFIG_ADC_ASYNC
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static int mcux_adc16_read_async(struct device *dev,
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const struct adc_sequence *sequence,
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struct k_poll_signal *async)
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{
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struct mcux_adc16_data *data = dev->driver_data;
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adc_context_lock(&data->ctx, true, async);
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return start_read(dev, sequence);
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}
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#endif
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static void mcux_adc16_start_channel(struct device *dev)
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{
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const struct mcux_adc16_config *config = dev->config->config_info;
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struct mcux_adc16_data *data = dev->driver_data;
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adc16_channel_config_t channel_config;
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u32_t channel_group = 0;
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data->channel_id = find_lsb_set(data->channels) - 1;
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SYS_LOG_DBG("Starting channel %d", data->channel_id);
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#if defined(FSL_FEATURE_ADC16_HAS_DIFF_MODE) && FSL_FEATURE_ADC16_HAS_DIFF_MODE
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channel_config.enableDifferentialConversion = false;
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#endif
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channel_config.enableInterruptOnConversionCompleted = true;
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channel_config.channelNumber = data->channel_id;
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ADC16_SetChannelConfig(config->base, channel_group, &channel_config);
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}
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static void adc_context_start_sampling(struct adc_context *ctx)
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{
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struct mcux_adc16_data *data =
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CONTAINER_OF(ctx, struct mcux_adc16_data, ctx);
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data->channels = ctx->sequence->channels;
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mcux_adc16_start_channel(data->dev);
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}
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static void adc_context_update_buffer_pointer(struct adc_context *ctx,
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bool repeat_sampling)
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{
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struct mcux_adc16_data *data =
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CONTAINER_OF(ctx, struct mcux_adc16_data, ctx);
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if (repeat_sampling) {
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data->buffer = data->repeat_buffer;
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}
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}
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static void mcux_adc16_isr(void *arg)
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{
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struct device *dev = (struct device *)arg;
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const struct mcux_adc16_config *config = dev->config->config_info;
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struct mcux_adc16_data *data = dev->driver_data;
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ADC_Type *base = config->base;
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u32_t channel_group = 0;
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u16_t result;
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result = ADC16_GetChannelConversionValue(base, channel_group);
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SYS_LOG_DBG("Finished channel %d. Result is 0x%04x",
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data->channel_id, result);
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*data->buffer++ = result;
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data->channels &= ~BIT(data->channel_id);
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if (data->channels) {
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mcux_adc16_start_channel(dev);
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} else {
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adc_context_on_sampling_done(&data->ctx, dev);
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}
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}
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static int mcux_adc16_init(struct device *dev)
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{
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const struct mcux_adc16_config *config = dev->config->config_info;
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struct mcux_adc16_data *data = dev->driver_data;
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ADC_Type *base = config->base;
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adc16_config_t adc_config;
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ADC16_GetDefaultConfig(&adc_config);
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ADC16_Init(base, &adc_config);
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ADC16_EnableHardwareTrigger(base, false);
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config->irq_config_func(dev);
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data->dev = dev;
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adc_context_unlock_unconditionally(&data->ctx);
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return 0;
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}
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static const struct adc_driver_api mcux_adc16_driver_api = {
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.channel_setup = mcux_adc16_channel_setup,
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.read = mcux_adc16_read,
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#ifdef CONFIG_ADC_ASYNC
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.read_async = mcux_adc16_read_async,
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#endif
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};
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#if CONFIG_ADC_0
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static void mcux_adc16_config_func_0(struct device *dev);
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static const struct mcux_adc16_config mcux_adc16_config_0 = {
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.base = (ADC_Type *)CONFIG_ADC_0_BASE_ADDRESS,
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.irq_config_func = mcux_adc16_config_func_0,
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};
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static struct mcux_adc16_data mcux_adc16_data_0 = {
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ADC_CONTEXT_INIT_TIMER(mcux_adc16_data_0, ctx),
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ADC_CONTEXT_INIT_LOCK(mcux_adc16_data_0, ctx),
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ADC_CONTEXT_INIT_SYNC(mcux_adc16_data_0, ctx),
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};
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DEVICE_AND_API_INIT(mcux_adc16_0, CONFIG_ADC_0_NAME, &mcux_adc16_init,
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&mcux_adc16_data_0, &mcux_adc16_config_0,
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POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&mcux_adc16_driver_api);
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static void mcux_adc16_config_func_0(struct device *dev)
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{
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IRQ_CONNECT(CONFIG_ADC_0_IRQ, CONFIG_ADC_0_IRQ_PRI,
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mcux_adc16_isr, DEVICE_GET(mcux_adc16_0), 0);
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irq_enable(CONFIG_ADC_0_IRQ);
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}
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#endif /* CONFIG_ADC_0 */
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#if CONFIG_ADC_1
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static void mcux_adc16_config_func_1(struct device *dev);
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static const struct mcux_adc16_config mcux_adc16_config_1 = {
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.base = (ADC_Type *)CONFIG_ADC_1_BASE_ADDRESS,
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.irq_config_func = mcux_adc16_config_func_1,
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};
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static struct mcux_adc16_data mcux_adc16_data_1 = {
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ADC_CONTEXT_INIT_TIMER(mcux_adc16_data_1, ctx),
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ADC_CONTEXT_INIT_LOCK(mcux_adc16_data_1, ctx),
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ADC_CONTEXT_INIT_SYNC(mcux_adc16_data_1, ctx),
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};
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DEVICE_AND_API_INIT(mcux_adc16_1, CONFIG_ADC_1_NAME, &mcux_adc16_init,
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&mcux_adc16_data_1, &mcux_adc16_config_1,
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POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&mcux_adc16_driver_api);
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static void mcux_adc16_config_func_1(struct device *dev)
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{
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IRQ_CONNECT(CONFIG_ADC_1_IRQ, CONFIG_ADC_1_IRQ_PRI,
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mcux_adc16_isr, DEVICE_GET(mcux_adc16_1), 0);
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irq_enable(CONFIG_ADC_1_IRQ);
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}
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#endif /* CONFIG_ADC_1 */
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