312 lines
9.9 KiB
C
312 lines
9.9 KiB
C
|
/**
|
||
|
|
* \file
|
||
|
|
*
|
||
|
|
* \brief SAM Sigma-Delta Analog-to-Digital Converter (SDADC) Driver
|
||
|
|
*
|
||
|
|
* Copyright (C) 2015 Atmel Corporation. All rights reserved.
|
||
|
|
*
|
||
|
|
* \asf_license_start
|
||
|
|
*
|
||
|
|
* \page License
|
||
|
|
*
|
||
|
|
* 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. The name of Atmel may not be used to endorse or promote products derived
|
||
|
|
* from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* 4. This software may only be redistributed and used in connection with an
|
||
|
|
* Atmel microcontroller product.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
|
||
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
|
||
|
|
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
|
||
|
|
*
|
||
|
|
* \asf_license_stop
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
/*
|
||
|
|
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "sdadc.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \internal Configure MUX settings for the analog pins
|
||
|
|
*
|
||
|
|
* This function will set the given SDADC input pins
|
||
|
|
* to the analog function in the pinmux, giving
|
||
|
|
* the SDADC access to the analog signal
|
||
|
|
*
|
||
|
|
* \param [in] pin AINxx pin to configure
|
||
|
|
*/
|
||
|
|
static inline void _sdadc_configure_ain_pin(uint32_t pin)
|
||
|
|
{
|
||
|
|
/* Pinmapping table for AINxx -> GPIO pin number */
|
||
|
|
const uint32_t pinmapping[] = {
|
||
|
|
#if (SAMC21E)
|
||
|
|
PIN_PA06B_SDADC_INN0, PIN_PA07B_SDADC_INP0,
|
||
|
|
#elif (SAMC21G)
|
||
|
|
PIN_PA06B_SDADC_INN0, PIN_PA07B_SDADC_INP0,
|
||
|
|
PIN_PB08B_SDADC_INN1, PIN_PB09B_SDADC_INP1,
|
||
|
|
#elif (SAMC21J)
|
||
|
|
PIN_PA06B_SDADC_INN0, PIN_PA07B_SDADC_INP0,
|
||
|
|
PIN_PB08B_SDADC_INN1, PIN_PB09B_SDADC_INP1,
|
||
|
|
PIN_PB06B_SDADC_INN2, PIN_PB07B_SDADC_INP2,
|
||
|
|
#else
|
||
|
|
# error SDADC pin mappings are not defined for this device.
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
uint32_t pin_map_result;
|
||
|
|
|
||
|
|
struct system_pinmux_config config;
|
||
|
|
system_pinmux_get_config_defaults(&config);
|
||
|
|
|
||
|
|
config.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE;
|
||
|
|
config.mux_position = 1;
|
||
|
|
|
||
|
|
pin_map_result = pinmapping[pin * 2];
|
||
|
|
system_pinmux_pin_set_config(pin_map_result, &config);
|
||
|
|
|
||
|
|
pin_map_result = pinmapping[pin * 2 + 1];
|
||
|
|
system_pinmux_pin_set_config(pin_map_result, &config);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \internal Writes an SDADC configuration to the hardware module
|
||
|
|
*
|
||
|
|
* Writes out a given SDADC module configuration to the hardware module.
|
||
|
|
*
|
||
|
|
* \param[out] module_inst Pointer to the SDADC software instance struct
|
||
|
|
* \param[in] config Pointer to configuration struct
|
||
|
|
*
|
||
|
|
* \return Status of the configuration procedure.
|
||
|
|
* \retval STATUS_OK The configuration was successful
|
||
|
|
* \retval STATUS_ERR_INVALID_ARG Invalid argument(s) were provided
|
||
|
|
*/
|
||
|
|
static enum status_code _sdadc_set_config(
|
||
|
|
struct sdadc_module *const module_inst,
|
||
|
|
struct sdadc_config *const config)
|
||
|
|
{
|
||
|
|
/* Get the hardware module pointer */
|
||
|
|
Sdadc *const sdadc_module = module_inst->hw;
|
||
|
|
|
||
|
|
/* Configure GCLK channel and enable clock */
|
||
|
|
struct system_gclk_chan_config gclk_chan_conf;
|
||
|
|
system_gclk_chan_get_config_defaults(&gclk_chan_conf);
|
||
|
|
gclk_chan_conf.source_generator = config->clock_source;
|
||
|
|
system_gclk_chan_set_config(SDADC_GCLK_ID, &gclk_chan_conf);
|
||
|
|
system_gclk_chan_enable(SDADC_GCLK_ID);
|
||
|
|
|
||
|
|
/* Setup pinmuxing for analog inputs */
|
||
|
|
_sdadc_configure_ain_pin(config->mux_input);
|
||
|
|
|
||
|
|
/* Configure run in standby */
|
||
|
|
sdadc_module->CTRLA.reg = (config->run_in_standby << SDADC_CTRLA_RUNSTDBY_Pos)
|
||
|
|
| (config->on_command << SDADC_CTRLA_ONDEMAND_Pos);
|
||
|
|
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure reference */
|
||
|
|
sdadc_module->REFCTRL.reg = (config->reference.ref_sel) | (config->reference.ref_range) |
|
||
|
|
(config->reference.on_ref_buffer << SDADC_REFCTRL_ONREFBUF_Pos);
|
||
|
|
|
||
|
|
/* Configure CTRLB */
|
||
|
|
sdadc_module->CTRLB.reg =
|
||
|
|
(config->skip_count << SDADC_CTRLB_SKPCNT_Pos) |
|
||
|
|
(config->clock_prescaler / 2 - 1) | config->osr;
|
||
|
|
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure CTRLC */
|
||
|
|
sdadc_module->CTRLC.reg =
|
||
|
|
(config->freerunning << SDADC_CTRLC_FREERUN_Pos);
|
||
|
|
|
||
|
|
/* Configure SEQCTRL */
|
||
|
|
sdadc_module->SEQCTRL.reg =
|
||
|
|
(config->seq_enable[0]) | (config->seq_enable[1] << 1) | (config->seq_enable[2] << 2);
|
||
|
|
|
||
|
|
/* Check validity of window thresholds */
|
||
|
|
if (config->window.window_mode != SDADC_WINDOW_MODE_DISABLE) {
|
||
|
|
if (config->window.window_lower_value > (int32_t)(SDADC_RESULT_RESULT_Msk / 2) ||
|
||
|
|
config->window.window_lower_value < -(int32_t)(SDADC_RESULT_RESULT_Msk / 2 + 1) ||
|
||
|
|
config->window.window_upper_value > (int32_t)(SDADC_RESULT_RESULT_Msk / 2) ||
|
||
|
|
config->window.window_upper_value < -(int32_t)(SDADC_RESULT_RESULT_Msk / 2 + 1)) {
|
||
|
|
/* Invalid value */
|
||
|
|
return STATUS_ERR_INVALID_ARG;
|
||
|
|
} else if (config->window.window_lower_value > (int32_t)SDADC_RESULT_RESULT_Msk ||
|
||
|
|
config->window.window_upper_value > (int32_t)SDADC_RESULT_RESULT_Msk){
|
||
|
|
/* Invalid value */
|
||
|
|
return STATUS_ERR_INVALID_ARG;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure window mode */
|
||
|
|
sdadc_module->WINCTRL.reg = config->window.window_mode;
|
||
|
|
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure lower threshold */
|
||
|
|
sdadc_module->WINLT.reg =
|
||
|
|
config->window.window_lower_value << SDADC_WINLT_WINLT_Pos;
|
||
|
|
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure lower threshold */
|
||
|
|
sdadc_module->WINUT.reg = config->window.window_upper_value <<
|
||
|
|
SDADC_WINUT_WINUT_Pos;
|
||
|
|
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure pin scan mode and positive and negative input pins */
|
||
|
|
sdadc_module->INPUTCTRL.reg = config->mux_input;
|
||
|
|
|
||
|
|
/* Configure events */
|
||
|
|
sdadc_module->EVCTRL.reg = config->event_action;
|
||
|
|
|
||
|
|
/* Disable all interrupts */
|
||
|
|
sdadc_module->INTENCLR.reg = (1 << SDADC_INTENCLR_WINMON_Pos) |
|
||
|
|
(1 << SDADC_INTENCLR_OVERRUN_Pos) | (1 << SDADC_INTENCLR_RESRDY_Pos);
|
||
|
|
|
||
|
|
/* Make sure offset correction value is valid */
|
||
|
|
if (config->correction.offset_correction > (int32_t)(SDADC_OFFSETCORR_MASK / 2) ||
|
||
|
|
config->correction.offset_correction < - (int32_t)(SDADC_OFFSETCORR_MASK / 2 + 1)) {
|
||
|
|
return STATUS_ERR_INVALID_ARG;
|
||
|
|
} else {
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set offset correction value */
|
||
|
|
sdadc_module->OFFSETCORR.reg = config->correction.offset_correction <<
|
||
|
|
SDADC_OFFSETCORR_OFFSETCORR_Pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Make sure gain_correction value is valid */
|
||
|
|
if (config->correction.gain_correction > SDADC_GAINCORR_MASK) {
|
||
|
|
return STATUS_ERR_INVALID_ARG;
|
||
|
|
} else {
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set gain correction value */
|
||
|
|
sdadc_module->GAINCORR.reg = config->correction.gain_correction <<
|
||
|
|
SDADC_GAINCORR_GAINCORR_Pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Make sure shift_correction value is valid */
|
||
|
|
if (config->correction.shift_correction > SDADC_SHIFTCORR_MASK) {
|
||
|
|
return STATUS_ERR_INVALID_ARG;
|
||
|
|
} else {
|
||
|
|
while (sdadc_is_syncing(module_inst)) {
|
||
|
|
/* Wait for synchronization */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set shift correction value */
|
||
|
|
sdadc_module->SHIFTCORR.reg = config->correction.shift_correction <<
|
||
|
|
SDADC_SHIFTCORR_SHIFTCORR_Pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
return STATUS_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief Initializes the SDADC.
|
||
|
|
*
|
||
|
|
* Initializes the SDADC device struct and the hardware module based on the
|
||
|
|
* given configuration struct values.
|
||
|
|
*
|
||
|
|
* \param[out] module_inst Pointer to the SDADC software instance struct
|
||
|
|
* \param[in] hw Pointer to the SDADC module instance
|
||
|
|
* \param[in] config Pointer to the configuration struct
|
||
|
|
*
|
||
|
|
* \return Status of the initialization procedure.
|
||
|
|
* \retval STATUS_OK The initialization was successful
|
||
|
|
* \retval STATUS_ERR_INVALID_ARG Invalid argument(s) were provided
|
||
|
|
* \retval STATUS_BUSY The module is busy with a reset operation
|
||
|
|
* \retval STATUS_ERR_DENIED The module is enabled
|
||
|
|
*/
|
||
|
|
enum status_code sdadc_init(
|
||
|
|
struct sdadc_module *const module_inst,
|
||
|
|
Sdadc *hw,
|
||
|
|
struct sdadc_config *config)
|
||
|
|
{
|
||
|
|
/* Sanity check arguments */
|
||
|
|
Assert(module_inst);
|
||
|
|
Assert(hw);
|
||
|
|
Assert(config);
|
||
|
|
|
||
|
|
/* Associate the software module instance with the hardware module */
|
||
|
|
module_inst->hw = hw;
|
||
|
|
|
||
|
|
/* Turn on the digital interface clock */
|
||
|
|
system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, MCLK_APBCMASK_SDADC);
|
||
|
|
|
||
|
|
if (hw->CTRLA.reg & SDADC_CTRLA_SWRST) {
|
||
|
|
/* We are in the middle of a reset. Abort. */
|
||
|
|
return STATUS_BUSY;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hw->CTRLA.reg & SDADC_CTRLA_ENABLE) {
|
||
|
|
/* Module must be disabled before initialization. Abort. */
|
||
|
|
return STATUS_ERR_DENIED;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Store the selected reference for later use */
|
||
|
|
module_inst->reference = config->reference;
|
||
|
|
|
||
|
|
#if SDADC_CALLBACK_MODE == true
|
||
|
|
for (uint8_t i = 0; i < SDADC_CALLBACK_N; i++) {
|
||
|
|
module_inst->callback[i] = NULL;
|
||
|
|
};
|
||
|
|
|
||
|
|
module_inst->registered_callback_mask = 0;
|
||
|
|
module_inst->enabled_callback_mask = 0;
|
||
|
|
module_inst->remaining_conversions = 0;
|
||
|
|
module_inst->job_status = STATUS_OK;
|
||
|
|
|
||
|
|
_sdadc_instances[0] = module_inst;
|
||
|
|
|
||
|
|
if (config->event_action == SDADC_EVENT_ACTION_DISABLED &&
|
||
|
|
!config->freerunning) {
|
||
|
|
module_inst->software_trigger = true;
|
||
|
|
} else {
|
||
|
|
module_inst->software_trigger = false;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Write configuration to module */
|
||
|
|
return _sdadc_set_config(module_inst, config);
|
||
|
|
}
|