一、TLV65618芯片

TLV5618A 带掉电功能 2.7V-5.5V，低功耗双路 12 位数模转换器

特点 ●双路 12 位电压输出 DAC ●可编程调节转换时间 - 快速模式 3μs - 低速模式 10μs ●兼容 TMS320 和 SPI 串行接口 16位串行接口包含4位控制和12位数据。

二、驱动代码

采用模拟SPI方式实现对TLV5618的控制。

头文件：

/** FILE                : tlv5618.h* DESCRIPTION         : This file is for tlv5618.c* Author              : JackWang* --------------------*/
#ifndef __tlv5618_h__
#define __tlv5618_h__#define Channal_A  1
#define Channal_B  2
#define Channal_AB 3//-------------------------- Typedef----------------------------//
typedef struct {int (* initialize)(void);int (* Write_A_B)(unsigned short,unsigned short,unsigned char);
}TLV5618_T;//--------------------------- Extern ---------------------------//
extern TLV5618_T tlv5618;#endif //__tlv5618_h__

实现文件：

/** FILE                : tlv5618.c* DESCRIPTION         : This file is tlv5618 driver.* Author              : JackWang*/
//--------------------------- Include ---------------------------//
#include "tlv5618.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"//--------------------------- Define ---------------------------//
#define TLV5618_CS_H     GPIO_SetBits(GPIOH,GPIO_Pin_10)
#define TLV5618_CS_L     GPIO_ResetBits(GPIOH,GPIO_Pin_10)#define TLV5618_DIN_H	 GPIO_SetBits(GPIOH,GPIO_Pin_8)
#define TLV5618_DIN_L    GPIO_ResetBits(GPIOH,GPIO_Pin_8)#define TLV5618_CLK_H	 GPIO_SetBits(GPIOH,GPIO_Pin_11)
#define TLV5618_CLK_L    GPIO_ResetBits(GPIOH,GPIO_Pin_11)//--------------------- Function Prototype ----------------------//
static int initialize(void);
static int Write_A_B(unsigned short,unsigned short,unsigned char);
static int EX_DAC_Conver(unsigned short);//--------------------------- Variable --------------------------//
TLV5618_T tlv5618 = {.initialize = initialize,.Write_A_B=Write_A_B
};/*!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!*/
static int 
initialize(void)
{GPIO_InitTypeDef   GPIO_uInitStructure;RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOH,ENABLE);GPIO_uInitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_10 | GPIO_Pin_11;    GPIO_uInitStructure.GPIO_Mode = GPIO_Mode_OUT;                        GPIO_uInitStructure.GPIO_OType = GPIO_OType_PP;                    GPIO_uInitStructure.GPIO_PuPd = GPIO_PuPd_UP;                         GPIO_uInitStructure.GPIO_Speed = GPIO_Speed_50MHz;                  GPIO_Init(GPIOH,&GPIO_uInitStructure);TLV5618_CS_H ;TLV5618_CLK_L ;TLV5618_DIN_L ;return 0;
}/*!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!*/
static int 
EX_DAC_Conver(unsigned short Dignum)
{unsigned short Dig = 0;TLV5618_CS_L;	TLV5618_CLK_H;for (int idx = 0; idx < 16; ++idx) {Dig=Dignum&0x8000;if (Dig) { TLV5618_DIN_H; }else     { TLV5618_DIN_L; }for (int delayTime = 0; delayTime < 100; ++delayTime );//for delay onlyTLV5618_CLK_L;Dignum<<=1;for (int delayTime = 0; delayTime < 100; ++delayTime );//for delay onlyTLV5618_CLK_H;}TLV5618_CLK_L;TLV5618_CS_H;	for (int delayTime = 0; delayTime < 1000; ++delayTime );//for delay onlyreturn 0;
}
/*!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!*/
static int 
Write_A_B(unsigned short Data_A, unsigned short Data_B, unsigned char Channal)
{unsigned short Temp=0x4000;switch(Channal){case Channal_A:		EX_DAC_Conver(Temp|0x8000|(0x0fff&Data_A));break;case Channal_B:		EX_DAC_Conver(Temp|0x0000|(0x0fff&Data_B));break;case Channal_AB:	EX_DAC_Conver(Temp|0x1000|(0x0fff&Data_B));EX_DAC_Conver(Temp|0x8000|(0x0fff&Data_A));break;default:break;}return 0;
}