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/**
*
* Author: Dylan Muller
* Copyright (c) 2025
* All rights reserved.
*
* - Commercial/IP use prohibited.
* - Attribution required.
* See License.txt
*
*/
#include "setup.h"
#include "peripheral/twi.h"
#include "driver/mcp4725.h"
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
void dac_init(uint16_t init_value)
{
dac_write(MCP4725_ID_GATE_VOLT, init_value, 0);
dac_write(MCP4725_ID_DRAIN_VOLT, init_value, 0);
_delay_ms(TRANSACT_DELAY_MS);
}
void dac_write(
uint8_t id,
uint16_t value,
uint8_t conv_bypass
)
{
uint8_t dev_addr = 0x0;
uint8_t cmd_buf[2] = {0x0, 0x0};
uint8_t drain_mode = 0x0;
switch(id)
{
case MCP4725_ID_GATE_VOLT:
dev_addr = TWI_ADDRESS_W(MCP4725_DEV_GATE_VOLT_ADDR);
break;
case MCP4725_ID_DRAIN_VOLT:
dev_addr = TWI_ADDRESS_W(MCP4725_DEV_DRAIN_VOLT_ADDR);
drain_mode = 1;
break;
}
if (conv_bypass == 0)
{
if (drain_mode == 1)
{
value = (uint16_t)(((uint32_t)value * 10)/MCP4725_DRAIN_GAIN);
}
}
cmd_buf[0] = ((value >> 8) & 0xF) | MCP4725_BIT_PD0(0) | MCP4725_BIT_PD1(0);
cmd_buf[1] = value & 0xFF;
twi_start(dev_addr, cmd_buf, sizeof(cmd_buf));
twi_flush();
}
uint16_t dac_read(
uint8_t id,
uint8_t conv_bypass
)
{
uint8_t dev_addr = 0x0;
uint8_t cmd_buf[3] = {0x0, 0x0, 0x0};
uint16_t value = 0x0;
uint8_t drain_mode = 0x0;
switch(id)
{
case MCP4725_ID_GATE_VOLT:
dev_addr = TWI_ADDRESS_R(MCP4725_DEV_GATE_VOLT_ADDR);
break;
case MCP4725_ID_DRAIN_VOLT:
dev_addr = TWI_ADDRESS_R(MCP4725_DEV_DRAIN_VOLT_ADDR);
drain_mode = 1;
break;
}
twi_start(dev_addr, cmd_buf, sizeof(cmd_buf));
twi_flush();
value = (((uint16_t)cmd_buf[1]) << 4) | (cmd_buf[2] >> 4);
if (conv_bypass == 0)
{
if (drain_mode)
{
value = (uint16_t)(((uint32_t)value * MCP4725_DRAIN_GAIN)/10);
}
}
return (value & 0xFFF);
}
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