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STM32模拟SPI时序控制双路16位数模转换（16bit DAC）芯片DAC8552电压输出

STM32部分芯片具有12位DAC输出能力，要实现16位及以上DAC输出需要外挂DAC转换ASIC。

DAC8552是双路16位DAC输出芯片，通过SPI三线总线进行配置控制输出。这里介绍通过GPIO管脚模拟时序进行控制的方式。

电路连接

DAC8552支持2.7V~5.5V的供电，根据需要提供电源电压，对于STM32可能面对不同供电电压的DAC8552, 因此STM32与DAC8552连接的三线，可以用10K电阻上拉到DAC8552的供电电压，而STM32选择支持FT（5V耐压）的三个管脚，并采用Open-drain无上下拉输出模式，从而可以兼容在各种供电条件下的DAC8552访问控制。对于STM32F103可以采用PB6, PB7和PB8进行连接，对于5V供电的DAC8552的连接如下图所示：

DAC8552控制协议

STM32通过发送24个位的SPI数据控制DAC8552的工作状态。其中前16个位为单路（通道A或通道B）的DAC配置值，后8个位为控制指令。

协议控制操作主要由两部分操作构成：

1. 发送24位数据到某个通道的buffer
2. 执行buffer里24位数据里的控制指令，即"load"某个通道，指令可能是通道关电，也可能是DAC电压根据配置数据值输出

在关电模式可以配置通道管脚处于1K下拉，100K下拉或高阻状态。操作方式比较多，如下图所示：


可以进行简化，对于通道配置只采用这几种指令：

对于通告关电只采用这几种：

STM32CUBEIDE工程配置

这里采用STM32CUBEIDE，对STM32F103C6T6芯片进行HAL库工程配置。
首先配置时钟系统：



然后配置三线的管脚：

保存并生成基本：

STM32工程代码

SPI三线只向DAC8552单向发送数据进行控制。在SYNC即片选低电平期间，每个SCLK时钟下降沿DAC8552采样输入数据。

这里采用的微秒级延时函数，参考 STM32 HAL us delay（微秒延时）的指令延时实现方式及优化 。

首先定义管脚输出态：

#define   DAC8552_SYNC_LOW    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);
#define   DAC8552_SYNC_HIGH   HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
#define   DAC8552_DIN_LOW     HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_RESET);
#define   DAC8552_DIN_HIGH    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET);
#define   DAC8552_SCLK_LOW    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_RESET);
#define   DAC8552_SCLK_HIGH   HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);

然后编写通道输出配置函数, 这里提供单通道和双通道配置的函数，以及单通道和双通道关电的函数：

void DAC8552_Set_Channel_A(uint16_t Data)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x10;WriteData = (CMD<<16) | Data;DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts
}void DAC8552_Set_Channel_B(uint16_t Data)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x24;WriteData = (CMD<<16) | Data;DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts
}void DAC8552_Set_Channel_AB(uint16_t Data)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x10;WriteData = (CMD<<16) | Data;DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;CMD = 0x24;WriteData = (CMD<<16) | Data;DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts
}void DAC8552_Set_PowerDown_1K_A(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x11;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_1K_B(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x25;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_1K_AB(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x11;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;CMD = 0x25;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_100K_A(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x12;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_100K_B(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x26;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_100K_AB(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x12;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;CMD = 0x26;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_Hz_A(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x13;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_Hz_B(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x27;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_Hz_AB(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x13;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;CMD = 0x27;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}

就可以进行函数调用实现控制DAC8552双路的电压输出值。如控制A路为DAC8552参考电压的1/2, B路输出为DAC8552参考电压的3/4：

  DAC8552_Set_Channel_A(32768);DAC8552_Set_Channel_B(49152);

完整的main.c代码如下：

/* USER CODE BEGIN Header */
/********************************************************************************* @file           : main.c* @brief          : Main program body******************************************************************************* @attention** Copyright (c) 2022 STMicroelectronics.* All rights reserved.** This software is licensed under terms that can be found in the LICENSE file* in the root directory of this software component.* If no LICENSE file comes with this software, it is provided AS-IS.********************************************************************************/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes *//* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
__IO float usDelayBase;
void PY_usDelayTest(void)
{__IO uint32_t firstms, secondms;__IO uint32_t counter = 0;firstms = HAL_GetTick()+1;secondms = firstms+1;while(uwTick!=firstms) ;while(uwTick!=secondms) counter++;usDelayBase = ((float)counter)/1000;
}void PY_Delay_us_t(uint32_t Delay)
{__IO uint32_t delayReg;__IO uint32_t usNum = (uint32_t)(Delay*usDelayBase);delayReg = 0;while(delayReg!=usNum) delayReg++;
}void PY_usDelayOptimize(void)
{__IO uint32_t firstms, secondms;__IO float coe = 1.0;firstms = HAL_GetTick();PY_Delay_us_t(1000000) ;secondms = HAL_GetTick();coe = ((float)1000)/(secondms-firstms);usDelayBase = coe*usDelayBase;
}void PY_Delay_us(uint32_t Delay)
{__IO uint32_t delayReg;__IO uint32_t msNum = Delay/1000;__IO uint32_t usNum = (uint32_t)((Delay%1000)*usDelayBase);if(msNum>0) HAL_Delay(msNum);delayReg = 0;while(delayReg!=usNum) delayReg++;
}
/* USER CODE END PTD *//* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define   DAC8552_SYNC_LOW    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);
#define   DAC8552_SYNC_HIGH   HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
#define   DAC8552_DIN_LOW     HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_RESET);
#define   DAC8552_DIN_HIGH    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET);
#define   DAC8552_SCLK_LOW    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_RESET);
#define   DAC8552_SCLK_HIGH   HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);void DAC8552_Set_Channel_A(uint16_t Data)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x10;WriteData = (CMD<<16) | Data;DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts
}void DAC8552_Set_Channel_B(uint16_t Data)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x24;WriteData = (CMD<<16) | Data;DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts
}void DAC8552_Set_Channel_AB(uint16_t Data)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x10;WriteData = (CMD<<16) | Data;DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;CMD = 0x24;WriteData = (CMD<<16) | Data;DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts
}void DAC8552_Set_PowerDown_1K_A(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x11;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_1K_B(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x25;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_1K_AB(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x11;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;CMD = 0x25;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_100K_A(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x12;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_100K_B(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x26;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_100K_AB(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x12;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;CMD = 0x26;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_Hz_A(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x13;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_Hz_B(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x27;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}void DAC8552_Set_PowerDown_Hz_AB(void)
{uint8_t CMD = 0;uint32_t WriteData = 0;__disable_irq() ; //disable all interruptsCMD = 0x13;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;CMD = 0x27;WriteData = (CMD<<16);DAC8552_SYNC_HIGH;PY_Delay_us_t(1);DAC8552_SYNC_LOW;for(uint8_t i=0;i<24;i++){if( (WriteData << i) & 0x800000 ){DAC8552_DIN_HIGH;}else{DAC8552_DIN_LOW;}DAC8552_SCLK_HIGH;PY_Delay_us_t(1);DAC8552_SCLK_LOW;PY_Delay_us_t(1);}DAC8552_SYNC_HIGH;__enable_irq() ;  //enable all interrupts}
/* USER CODE END PD *//* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM *//* USER CODE END PM *//* Private variables ---------------------------------------------------------*//* USER CODE BEGIN PV *//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP *//* USER CODE END PFP *//* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 *//* USER CODE END 0 *//*** @brief  The application entry point.* @retval int*/
int main(void)
{/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration--------------------------------------------------------*//* Reset of all peripherals, Initializes the Flash interface and the Systick. */HAL_Init();/* USER CODE BEGIN Init *//* USER CODE END Init *//* Configure the system clock */SystemClock_Config();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();/* USER CODE BEGIN 2 */PY_usDelayTest();PY_usDelayOptimize();DAC8552_Set_Channel_A(32768);DAC8552_Set_Channel_B(49152);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){PY_Delay_us_t(1000000);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}/*** @brief System Clock Configuration* @retval None*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct = {0};RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};/** Initializes the RCC Oscillators according to the specified parameters* in the RCC_OscInitTypeDef structure.*/RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;RCC_OscInitStruct.HSEState = RCC_HSE_ON;RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;RCC_OscInitStruct.HSIState = RCC_HSI_ON;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK){Error_Handler();}/** Initializes the CPU, AHB and APB buses clocks*/RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK){Error_Handler();}
}/*** @brief GPIO Initialization Function* @param None* @retval None*/
static void MX_GPIO_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct = {0};/* GPIO Ports Clock Enable */__HAL_RCC_GPIOD_CLK_ENABLE();__HAL_RCC_GPIOB_CLK_ENABLE();/*Configure GPIO pin Output Level */HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_8, GPIO_PIN_SET);/*Configure GPIO pins : PB6 PB7 PB8 */GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_8;GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);}/* USER CODE BEGIN 4 *//* USER CODE END 4 *//*** @brief  This function is executed in case of error occurrence.* @retval None*/
void Error_Handler(void)
{/* USER CODE BEGIN Error_Handler_Debug *//* User can add his own implementation to report the HAL error return state */__disable_irq();while (1){}/* USER CODE END Error_Handler_Debug */
}#ifdef  USE_FULL_ASSERT
/*** @brief  Reports the name of the source file and the source line number*         where the assert_param error has occurred.* @param  file: pointer to the source file name* @param  line: assert_param error line source number* @retval None*/
void assert_failed(uint8_t *file, uint32_t line)
{/* USER CODE BEGIN 6 *//* User can add his own implementation to report the file name and line number,ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) *//* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

STM32例程下载

STM32F103C6T6模拟SPI时序控制DAC8552电压输出例程

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