#include "dac161s997.h"


/**
 * @brief 向DAC161S997芯片写入寄存器值
 *
 * 该函数通过SPI接口向DAC161S997芯片写入指定的寄存器值。
 *
 * @param dac_num DAC芯片编号
 * @param reg 要写入的寄存器地址
 * @param data 要写入的数据，16位
 */
void dac161s997_write_reg(uint8_t dac_num, uint8_t reg, uint16_t data)
{
    uint8_t data_buffer[3] = {0, 0, 0};
    data_buffer[0] = reg;
    data_buffer[1] = data >> 8;
    data_buffer[2] = data;
    
    HAL_GPIO_WritePin(DAC1_CS_GPIO_Port, DAC1_CS_Pin, GPIO_PIN_RESET); // CS拉低
    HAL_SPI_Transmit(&hspi1, data_buffer, 3, 1000);
    HAL_GPIO_WritePin(DAC1_CS_GPIO_Port, DAC1_CS_Pin, GPIO_PIN_SET);   // CS拉高
}

/**
 * @brief 初始化DAC161S997 DAC设备
 */
void dac161s997_init(void)
{
    // 初始化CS引脚
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    __HAL_RCC_GPIOB_CLK_ENABLE();
    GPIO_InitStruct.Pin = DAC1_CS_Pin;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    HAL_GPIO_Init(DAC1_CS_GPIO_Port, &GPIO_InitStruct);
    HAL_GPIO_WritePin(DAC1_CS_GPIO_Port, DAC1_CS_Pin, GPIO_PIN_SET);
    
    // 初始化DAC161S997芯片寄存器
    dac161s997_write_reg(1, DAC161S997_ERR_LOW_REG, 0xFFFF);
    dac161s997_write_reg(1, DAC161S997_ERR_CONFIG_REG, 0x070E);
}

/**
 * @brief DAC161S997芯片输出函数
 *
 * 此函数用于设置DAC161S997芯片的输出电流。
 *
 * @param dac_num DAC芯片类型
 * @param current 需要设置的电流值，单位：毫安
 */
void dac161s997_output(uint8_t dac_num, float current)
{
    uint32_t dac_code = (uint32_t)((current * 65535.0f) / 24.0f);
    uint8_t data_buffer[3] = {0, 0, 0};
    data_buffer[0] = DAC161S997_DACCODE_REG;
    data_buffer[1] = dac_code >> 8;
    data_buffer[2] = dac_code;
    
    HAL_GPIO_WritePin(DAC1_CS_GPIO_Port, DAC1_CS_Pin, GPIO_PIN_RESET); // CS拉低
    HAL_SPI_Transmit(&hspi1, data_buffer, 3, 1000);
    HAL_GPIO_WritePin(DAC1_CS_GPIO_Port, DAC1_CS_Pin, GPIO_PIN_SET);   // CS拉高
}