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- #include "mcp4725.h"
- #include "nrf_drv_twi.h"
- #include "nrf_delay.h"
- #include "boards.h"
- #include "app_util_platform.h"
- #define MCP4725_BASE_ADDRESS 0x60
- #define MCP4725_DAC_ADDRESS 0x40
- #define MCP4725_EEPROM_ADDRESS 0x60
- #define RDY_BIT_POS 0x07
- static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID_USED);
- volatile bool m_xfer_done = false;
- volatile bool m_read_done = false;
- 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;
- }
- }
- 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)
- {
-
- 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));
- }
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