157 lines
4.9 KiB
C
157 lines
4.9 KiB
C
/**
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* Copyright (c) 2016 - 2019, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "mcp4725.h"
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#include "nrf_drv_twi.h"
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#include "nrf_delay.h"
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#include "boards.h"
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#include "app_util_platform.h"
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/*lint ++flb "Enter library region" */
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#define MCP4725_BASE_ADDRESS 0x60 //!< MCP4725 base address
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#define MCP4725_DAC_ADDRESS 0x40 //!< MCP4725 write-to-dac register
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#define MCP4725_EEPROM_ADDRESS 0x60 //!< MCP4725 write-to-eeprom register
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#define RDY_BIT_POS 0x07 //!< Position of RDY bit
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/* TWI instance. */
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static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID_USED);
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/* Twi transfer indicators. */
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volatile bool m_xfer_done = false;
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volatile bool m_read_done = false;
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/**
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* @brief TWI events handler.
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*/
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static void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
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{
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switch (p_event->type)
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{
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case NRF_DRV_TWI_EVT_DONE:
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if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_TX)
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{
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m_xfer_done = true;
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}
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if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
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{
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m_read_done = true;
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}
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break;
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default:
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break;
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}
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}
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/**
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* @brief TWI initialization.
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*
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* @param[in] p_pins_config Pointer to structere holding pins numbers to be used by TWI.
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*/
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static ret_code_t twi_init(mcp4725_pins_config_t const * p_pins_config)
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{
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ret_code_t err_code;
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const nrf_drv_twi_config_t twi_mcp4725_config = {
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.scl = p_pins_config->scl_pin,
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.sda = p_pins_config->sda_pin,
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.frequency = NRF_DRV_TWI_FREQ_100K,
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.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
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.clear_bus_init = false
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};
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err_code = nrf_drv_twi_init(&m_twi, &twi_mcp4725_config, twi_handler, NULL);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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nrf_drv_twi_enable(&m_twi);
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return NRF_SUCCESS;
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}
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ret_code_t mcp4725_setup(mcp4725_pins_config_t const * p_pins_config)
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{
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ret_code_t err_code = twi_init(p_pins_config);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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return NRF_SUCCESS;
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}
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ret_code_t mcp4725_set_voltage(uint16_t val, bool write_eeprom)
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{
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/* Shift parameter val to get 2 8-bits values. */
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uint8_t reg[3] = {write_eeprom ? MCP4725_EEPROM_ADDRESS : MCP4725_DAC_ADDRESS,
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(val>>4), (val<<4)};
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m_xfer_done = false;
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ret_code_t err_code = nrf_drv_twi_tx(&m_twi, MCP4725_BASE_ADDRESS, reg, sizeof(reg), false);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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while (m_xfer_done == false);
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return NRF_SUCCESS;
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}
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bool mcp4725_is_busy(void)
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{
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uint8_t busy;
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m_read_done = false;
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ret_code_t err_code = nrf_drv_twi_rx(&m_twi, MCP4725_BASE_ADDRESS, &busy, sizeof(busy));
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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while (m_read_done == false);
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return (bool)(!(busy >> RDY_BIT_POS));
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}
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/*lint --flb "Leave library region" */
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