155 lines
4.2 KiB
C
155 lines
4.2 KiB
C
#include "dac161p997.h"
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#include "delay.h"
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static dac161p997_t _handle;
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static void _delay_us(uint32_t us)
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{
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delay_hardware_us(_handle.timer_us, us);
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}
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static void dac161p997_output_0()
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{
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_handle.io->set(*_handle.io);
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_delay_us(DUTY_CYCLE_25);
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_handle.io->reset(*_handle.io);
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_delay_us(DUTY_CYCLE_75);
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}
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static void dac161p997_output_1()
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{
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_handle.io->set(*_handle.io);
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_delay_us(DUTY_CYCLE_75);
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_handle.io->reset(*_handle.io);
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_delay_us(DUTY_CYCLE_25);
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}
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static void dac161p997_output_d()
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{
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_handle.io->set(*_handle.io);
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_delay_us(DUTY_CYCLE_50);
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_handle.io->reset(*_handle.io);
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_delay_us(DUTY_CYCLE_50);
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}
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/**
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* @brief 输出DAC161符号
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*
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* 根据传入的符号类型，调用相应的DAC161输出函数。
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*
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* @param sym 符号类型，可以是ZERO_SYM、ONE_SYM或其他值。
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*/
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static void dac161p997_output_symbol(uint8_t sym)
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{
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switch (sym)
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{
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case ZERO_SYM:
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dac161p997_output_0();
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break;
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case ONE_SYM:
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dac161p997_output_1();
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break;
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default:
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dac161p997_output_d();
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break;
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}
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}
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/**
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* @brief 向DAC161写入寄存器
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*
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* 向DAC161写入一个16位的数据，并附加一个8位的标签。
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* 芯片会回复一个应答信号，此处忽略应答信号。可以通过设置寄存器关闭应答信号。
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* @param data 要写入的数据，16位。
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* @param tag 附加的标签，8位。tag = 0时，写DAC寄存器；tag = 1时，写配置寄存器。
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*/
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void dac161p997_swif_write_reg(uint16_t data, uint8_t tag)
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{
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uint8_t plow, phigh;
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uint16_t i, tmp;
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/* compute parity low */
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tmp = data & 0x00ff; // get least significant byte
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for (plow = 0; tmp != 0; tmp >>= 1)
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{
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if (tmp & 0x1) // test if lsb is 1
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plow++; // count number of bits equal to 1
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}
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if (plow & 0x1) // check if number of 1s is odd
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plow = 0; // set even parity
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else
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plow = 1; // else set odd parity
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/* compute parity high */
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tmp = (data & 0xff00) >> 8; // get most significant byte
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for (phigh = 0; tmp != 0; tmp >>= 1)
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{
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if (tmp & 0x1) // test if lsb is 1
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phigh++; // count number of bits equal to 1
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}
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if (phigh & 0x1) // check if number of 1s is odd
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phigh = 0; // set even parity
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else
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phigh = 1; // set odd parity
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phigh = phigh ^ tag; // parity high is for high slice = tag + 1 byte
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dac161p997_output_symbol(IDLE_SYM); // Frame start: send an idle symbol first
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dac161p997_output_symbol(tag);
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tmp = data;
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for (i = 0; i < 16; i++) // send 16 data bits msb to lsb
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{
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if (tmp & 0x8000)
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{
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dac161p997_output_symbol(ONE_SYM); // send 1
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}
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else
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{
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dac161p997_output_symbol(ZERO_SYM); // send 0
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}
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tmp = tmp << 1; // move next data bit to msb
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}
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dac161p997_output_symbol(phigh); // send parity high bit
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dac161p997_output_symbol(plow); // send parity low bit
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dac161p997_output_symbol(IDLE_SYM); // send idle
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}
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/**
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* @brief 设置DAC161输出电流
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*
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* 通过向DAC161写入指定的电流值来设置其输出电流,输出电流持续时间100ms。
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*
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* @param current 要设置的电流值
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*/
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void dac161p997_output_current(float32 current)
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{
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uint16_t adc = (uint16_t)(current * DAC161P997_CURRENT_SLOPE);
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dac161p997_swif_write_reg(adc, DACCODE_WRITE);
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}
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/**
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* @brief 初始化DAC161设备
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*
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* 此函数用于初始化DAC161设备，进行必要的配置，以便设备正常工作。
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* 写寄存器之前要先解锁，具体配置寄存器根据需要配置的寄存器而定
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* 具体步骤包括：
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* 1. 解锁DAC161的配置寄存器
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* 2. 配置DAC161的错误下限寄存器
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* 3. 锁定DAC161的配置寄存器
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*/
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void dac161p997_init(TIM_TypeDef *timer_us)
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{
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DBG_ASSERT(timer_us != NULL __DBG_LINE);
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_handle.timer_us = timer_us;
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ENABLE_TIM_COUNT(_handle.timer_us);
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_handle.io = gpio_create(DAC161P997_IO_PORT, DAC161P997_IO_PIN);
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dac161p997_swif_write_reg(DAC161P997_LCK_REG + DAC161P997_LCK_REG_UNLOCK, CONFIG_WRITE);
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dac161p997_swif_write_reg(DAC161P997_CONFIG2_REG, CONFIG_WRITE);
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dac161p997_swif_write_reg(DAC161P997_LCK_REG + DAC161P997_LCK_REG_LOCK, CONFIG_WRITE);
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}
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