咸阳北京网站建设,镇江金山网镇江新闻,买网站做设计参考属于什么费用,做漂亮的网站【嵌入式硬件芯片开发笔记】HART协议调制解调芯片AD5700配置流程
XTAL_EN接地#xff0c;CLK_CFG的两个引脚由同一个GPIO控制 初始时HART_CLK_CFG输出低电平
由RTS引脚控制调制/解调。当RTS处于高电平时#xff0c;为解调#xff08;输入#xff09;#xff1b;否则为调…【嵌入式硬件芯片开发笔记】HART协议调制解调芯片AD5700配置流程
XTAL_EN接地CLK_CFG的两个引脚由同一个GPIO控制 初始时HART_CLK_CFG输出低电平
由RTS引脚控制调制/解调。当RTS处于高电平时为解调输入否则为调制输出。切换时延时1ms
HART协议部分符合HART物理层要求(修订版8.1)。 一个标准UART帧该帧包含一个起始位、8位数据、一个奇偶校验和一个停止位 UART1200波特率 1停止位 无校验 数据长度8 开始运行
检测HART_VDD至少大于2.7V引脚HART_CLK_CFG初始时为低电平拉高后CLKOUT输出1.2288MHz用定时器进行捕获计算频率是否达标最后开启调制或解调 初始化使能CFG引脚进行时钟检测采用定时器捕获的方式计算频率计算速度不够则可能算不准关闭CFG引脚解调模式接收数据当串口接收中断发生时解析命令并切换调制模式返回数据
代码例程
uint8_t UART4_RxBuffer[256]{0};
uint8_t UART4_RxFlag0;/*** brief UART4 Initialization Function* param None* retval None*/
static void MX_UART4_Init(void)
{/* USER CODE BEGIN UART4_Init 0 *//* USER CODE END UART4_Init 0 *//* USER CODE BEGIN UART4_Init 1 *//* USER CODE END UART4_Init 1 */huart4.Instance UART4;huart4.Init.BaudRate 1200;huart4.Init.WordLength UART_WORDLENGTH_8B;huart4.Init.StopBits UART_STOPBITS_1;huart4.Init.Parity UART_PARITY_NONE;huart4.Init.Mode UART_MODE_TX_RX;huart4.Init.HwFlowCtl UART_HWCONTROL_NONE;huart4.Init.OverSampling UART_OVERSAMPLING_16;huart4.Init.OneBitSampling UART_ONE_BIT_SAMPLE_DISABLE;huart4.AdvancedInit.AdvFeatureInit UART_ADVFEATURE_NO_INIT;if (HAL_UART_Init(huart4) ! HAL_OK){Error_Handler();}/* USER CODE BEGIN UART4_Init 2 */HAL_UART_Receive_IT(huart4,UART4_RxBuffer,1);/* USER CODE END UART4_Init 2 */}/*!* brief 初始化AD5421** param None** return None*/
void Init_AD5421(void)
{ uint16_t offset 0;uint16_t gain 0;Ctrl_AD5421(hspi2,AD5421_RESET,0,true);delay_us(50);Ctrl_AD5421(hspi2,AD5421_Control,0xFC00,true); offset Ctrl_AD5421(hspi2,AD5421_Offset_Adjust,0,false); gain Ctrl_AD5421(hspi2,AD5421_Gain_Adjust,0,false);Ctrl_AD5421_DAC(20,true,offset,gain);Ctrl_AD5421_ADC(1,true);Ctrl_AD5421_ADC(0,true);
}/*!* brief 使能HART_CLK_OUT的定时器用于输入捕获上升沿捕获4次有效** param None** return freq: 浮点型频率变量单位为Hz*/
float Get_HART_CLK_Cycle(void)
{uint32_t Count0;float freq0;TIM3_CH2_Flag0;TIM3_CH2_Overflow0;TIM3_CH2_Count[0]0;TIM3_CH2_Count[1]0; TIM_RESET_CAPTUREPOLARITY(htim3,TIM_CHANNEL_2); __HAL_TIM_SET_CAPTUREPOLARITY(htim3, TIM_CHANNEL_2, TIM_INPUTCHANNELPOLARITY_FALLING); HAL_TIM_Base_Start_IT(htim3);HAL_TIM_IC_Start_IT(htim3, TIM_CHANNEL_2);while(TIM3_CH2_Flag2);TIM3_CH2_Flag0;CountTIM3_CH2_Overflow*(0xFFFF1)TIM3_CH2_Count[1]-TIM3_CH2_Count[0]; freq50000000.0f/Count;TIM3_CH2_Overflow0;TIM3_CH2_Count[0]0;TIM3_CH2_Count[1]0;printf([INFO] HART_CLK: %0.4f Hz\n,freq);return freq;
}/*!* brief 操作AD5700的HART调制/解调** param [in] dat_buf: 要写入的数据可以填NULL* [in] size: 要写入的数据个数单位byte* [in] WriteNotRead: true写入调制发送UART数据然后通过HART发出来* false读取解调接收HART数据解调以后以中断的方式接收UART数据** return None*/
void Ctrl_AD5700_HART(uint8_t *dat_buf,uint8_t size,bool WriteNotRead)
{if(WriteNotRead){Disable_AD5700_RTS;delay_ms(1);HAL_UART_Transmit(huart4,dat_buf,size,0xFFFF);}else{Enable_AD5700_RTS;delay_ms(1);HAL_UART_Receive_IT(huart4,UART4_RxBuffer[UART4_RxFlag],1); //开启中断 填入的buf最好是HART专用的数据buf 全局变量 然后在回调里面也改成HART的buf}
}/*!* brief 初始化AD5700** param None** return None*/
void Init_AD5700(void)
{//ADC检测 Enable_HART_CLK_CFG;
// //时钟检测
// Get_HART_CLK_Cycle();// Disable_HART_CLK_CFG;Ctrl_AD5700_HART(NULL,0,false);
}void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{if(huarthuart2){ HAL_UART_Transmit(huart2,RxBuffer,1,0xFFFF);HAL_UART_Receive_IT(huart2,RxBuffer,1);}else if(huarthuart3){ HAL_UART_Transmit(huart3,RxBuffer,1,0xFFFF);HAL_UART_Receive_IT(huart3,RxBuffer,1);}else if(huarthuart4){
// HAL_UART_Transmit(huart4,UART4_RxBuffer[UART4_RxFlag],1,0xFFFF);UART4_RxFlag;HAL_UART_Receive_IT(huart4,UART4_RxBuffer[UART4_RxFlag],1);}else if(huarthuart5){ HAL_UART_Transmit(huart5,RxBuffer,1,0xFFFF);if((RxBuffer5)6){load_dac(RxBuffer0x1F);}HAL_UART_Receive_IT(huart5,RxBuffer,1);}
}
