diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/mcp4725/mcp4725.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/mcp4725/mcp4725.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/mcp4725/mcp4725.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/mcp4725/mcp4725.c new file mode 100644 index 0000000..de720e7 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/mcp4725/mcp4725.c @@ -0,0 +1,156 @@ +/** + * Copyright (c) 2016 - 2018, Nordic Semiconductor ASA + * + * All rights reserved. + * + * 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, except as embedded into a Nordic + * Semiconductor ASA integrated circuit in a product or a software update for + * such product, 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. Neither the name of Nordic Semiconductor ASA nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * 4. This software, with or without modification, must only be used with a + * Nordic Semiconductor ASA integrated circuit. + * + * 5. Any software provided in binary form under this license must not be reverse + * engineered, decompiled, modified and/or disassembled. + * + * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS 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. + * + */ +#include "mcp4725.h" +#include "nrf_drv_twi.h" +#include "nrf_delay.h" +#include "boards.h" +#include "app_util_platform.h" + +/*lint ++flb "Enter library region" */ +#define MCP4725_BASE_ADDRESS 0x60 //!< MCP4725 base address + +#define MCP4725_DAC_ADDRESS 0x40 //!< MCP4725 write-to-dac register +#define MCP4725_EEPROM_ADDRESS 0x60 //!< MCP4725 write-to-eeprom register + +#define RDY_BIT_POS 0x07 //!< Position of RDY bit + +/* TWI instance. */ +static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID_USED); + +/* Twi transfer indicators. */ +volatile bool m_xfer_done = false; +volatile bool m_read_done = false; + +/** + * @brief TWI events handler. + */ +static void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context) +{ + switch (p_event->type) + { + case NRF_DRV_TWI_EVT_DONE: + if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_TX) + { + m_xfer_done = true; + } + if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX) + { + m_read_done = true; + } + break; + default: + break; + } +} + +/** + * @brief TWI initialization. + * + * @param[in] p_pins_config Pointer to structere holding pins numbers to be used by TWI. + */ +static ret_code_t twi_init(mcp4725_pins_config_t const * p_pins_config) +{ + ret_code_t err_code; + + const nrf_drv_twi_config_t twi_mcp4725_config = { + .scl = p_pins_config->scl_pin, + .sda = p_pins_config->sda_pin, + .frequency = NRF_DRV_TWI_FREQ_100K, + .interrupt_priority = APP_IRQ_PRIORITY_HIGH, + .clear_bus_init = false + }; + + err_code = nrf_drv_twi_init(&m_twi, &twi_mcp4725_config, twi_handler, NULL); + if (err_code != NRF_SUCCESS) + { + return err_code; + } + + nrf_drv_twi_enable(&m_twi); + return NRF_SUCCESS; +} + +ret_code_t mcp4725_setup(mcp4725_pins_config_t const * p_pins_config) +{ + ret_code_t err_code = twi_init(p_pins_config); + if (err_code != NRF_SUCCESS) + { + return err_code; + } + + return NRF_SUCCESS; +} + +ret_code_t mcp4725_set_voltage(uint16_t val, bool write_eeprom) +{ + /* Shift parameter val to get 2 8-bits values. */ + uint8_t reg[3] = {write_eeprom ? MCP4725_EEPROM_ADDRESS : MCP4725_DAC_ADDRESS, + (val>>4), (val<<4)}; + + m_xfer_done = false; + + ret_code_t err_code = nrf_drv_twi_tx(&m_twi, MCP4725_BASE_ADDRESS, reg, sizeof(reg), false); + if (err_code != NRF_SUCCESS) + { + return err_code; + } + + while (m_xfer_done == false); + + return NRF_SUCCESS; +} + +bool mcp4725_is_busy(void) +{ + uint8_t busy; + m_read_done = false; + + ret_code_t err_code = nrf_drv_twi_rx(&m_twi, MCP4725_BASE_ADDRESS, &busy, sizeof(busy)); + if (err_code != NRF_SUCCESS) + { + return err_code; + } + + while (m_read_done == false); + + return (bool)(!(busy >> RDY_BIT_POS)); +} + +/*lint --flb "Leave library region" */ |