STM32F4驱动LTC2664-16驱动程序

最新推荐文章于 2024-10-22 12:39:39 发布

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最新推荐文章于 2024-10-22 12:39:39 发布

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文章标签： stm32 单片机嵌入式 arm

本文链接：https://blog.youkuaiyun.com/shangxianlemei/article/details/107729998

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本文介绍LTC2664 DAC芯片的配置方法，包括SPI接口初始化、输出电压范围设置及寄存器操作。通过具体代码示例，展示了如何设定输出范围、写入寄存器及更新通道。

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1.LTC2664是一款DAC芯片，输出范围可调。

头文件定义寄存器

#define LTC2664_CMD_CODE_N          0x00   /* write code to n */
#define LTC2664_CMD_CODE_A        0x80    /* write conde to all */
#define LTC2664_CMD_SPAN_N        0x60   /* write span to n */
#define LTC2664_CMD_SPAN_A        0xE0    /* write span to all */
#define LTC2664_CMD_UPDT_N           0x10    /* Update n */
#define LTC2664_CMD_UPDT_A        0x90    /* update all */
#define LTC2664_CMD_CDUP_N         0x30    /* write code to n ,update n*/
#define LTC2664_CMD_CDUP_NA           0x20    /* write code to n ,update all */
#define LTC2664_CMD_CDUP_A            0xA0   /* write code to all ,update all*/
#define LTC2664_CMD_POWD_N            0x40   /* power down n*/
#define LTC2664_CMD_POWD_A            0x50   /* power down chip*/
#define LTC2664_CMD_ANAL_M            0xB0   /* analog mux*/
#define LTC2664_CMD_TOGL_S            0xC0   /* toggle select*/
#define LTC2664_CMD_TOGL_G            0xD0   /* globle toggle*/
#define LTC2664_CMD_CONFIG            0x70 /*config*/
#define LTC2664_CMD_NOOPTION        0xF0   /* no option*/

#define LTC2664_ADDR_0        0x00   /* DAC0*/
#define LTC2664_ADDR_1        0x01   /* DAC1*/
#define LTC2664_ADDR_2        0x02   /* DAC2*/
#define LTC2664_ADDR_3        0x03   /* DAC3*/

#define LTC2664_SPAN0_5 0x00      /* 0-5V*/
#define LTC2664_SPAN0_10 0x01      /* 0-10V*/
#define LTC2664_SPAN_5_5 0x02      /* -5-5V*/
#define LTC2664_SPAN_10_10 0x03      /* -10-10V*/
#define LTC2664_SPAN_2V5_2V5 0x04      /* -2.5-2.5V*/

#define LTC2664_SEND_BYTE(Byte) DrvSpiSendData(LTC2664_SPI,Byte)

初始化SPI接口Mode0模式

void ltc2664_Bsp_Init(void)
{

    SPI_InitTypeDef SPI_InitStructure;
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;//最大16M 主频100M

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;

    DrvSpiInit(LTC2664_SPI,&SPI_InitStructure);
       LTC2664_CS_INIT();

}

定义输出电压范围为-5V-5V

uint8_t InitLtc2664(void)
{
    ltc2664_Bsp_Init();
       DelayMs(10);
       Ltc2664SetSpanN(LTC2664_ADDR_0,LTC2664_SPAN_5_5);
       Ltc2664SetSpanN(LTC2664_ADDR_1,LTC2664_SPAN_5_5);
       Ltc2664SetSpanN(LTC2664_ADDR_2,LTC2664_SPAN_5_5);
       Ltc2664SetSpanN(LTC2664_ADDR_3,LTC2664_SPAN_5_5);
    return True;
}

写寄存器函数

void LTC1664WriteRegValue(uint8_t cmd,uint8_t addr ,uint16_t value)
{
uint8_t i;
uint8_t un8WriteBuf[3];

       LTC2664_CS_LOW();

       un8WriteBuf[2] = (uint8_t)((value & 0x00FF) >> 0);
       un8WriteBuf[1] = (uint8_t)((value & 0xFF00) >> 8);
       un8WriteBuf[0] = cmd|addr;

    for(i = 0; i < 3; i++)
    {
       LTC2664_SEND_BYTE(un8WriteBuf[i]);
    }
       LTC2664_CS_HIG();
}

配置并不更新通道函数

void Ltc2664SetCodeN(uint8_t chn,uint16_t value)
{
LTC1664WriteRegValue(LTC2664_CMD_CODE_N,chn,value);
}

配置并更新通道函数

void Ltc2664SetUpdtN(uint8_t chn,uint16_t value)
{
LTC1664WriteRegValue(LTC2664_CMD_UPDT_N,chn,value);
}