[GD32F190方案分享] 基于GD32F190的I2C总线扫描

jackh

[GD32F190方案分享]基于GD32F190的I2C总线扫描
因为挂在I2C总线的装置, 经常不确定该装置地址的I2C是甚么, 因此做了个I2C总线扫描程序!
程序使用GD32F190的I2C2 , PF6:SCL, PF7:SDA.

扫描后由USB串口输出结果.

主程序如下:
/**  ******************************************************************************  * @file    main.c  * @author  MCU SD  * @version V1.0.0  * @date    12-Jun-2016  * @brief   The main function file.  ******************************************************************************  */    /* Includes ------------------------------------------------------------------*/#include <stdio.h>#include "gd32f1x0.h"#include "SysTick.h"#include "gd32f1x0_eval.h"#ifdef __GNUC__  /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf     set to 'Yes') calls __io_putchar() */  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)#else  #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)#endif /* __GNUC__ *//* Private variables ---------------------------------------------------------*/#define  I2C_OWN_ADDRESS7  0x82#define  I2C2_Speed  100000 // 100KHzuint8_t  I2C_Count = 0; // 0~127 : number of I2C deviseuint16_t I2C_Device_Address = 0x0; // (from 0x00 to 0x7F)<<1uint16_t I2C_TimeOut = 0xFFFF;uint16_t I2C_Time = 0;uint8_t  I2C_Found = 0; // 0:not found  1:founduint8_t  I2C_Found_Count = 0; // total found     uint8_t count;        /* Private function prototypes -----------------------------------------------*/static void USART_Configuration(void);  void I2C2_GPIO_Configuration(void);void I2C2_Configuration(void);/* Private functions ---------------------------------------------------------*//**   * @brief  Main program.  * @param  None  * @retval None  */int main(void){       /* SysTick Configuration*/    SysTick_Configuration();        /* USART parameter Configuration */    USART_Configuration(); // 115200,8,n,1        /* Config I2C2 GPIO */    I2C2_GPIO_Configuration(); // PF6(SCL) , PF7(SDA)        /* I2C2 parameter Configuration */    I2C2_Configuration(); // I2C2, AF0        /* GD32190R-EVAL-V1.1 Start up */    printf("\r\n The I2C Master : SCL(PF6) , SDA(PF7)  \n\r");    printf("\r\n The I2C Speed : %d \n\r", I2C2_Speed);        // if(I2C_24C02_Test()==I2C_OK)        for (I2C_Count=0; I2C_Count<128; I2C_Count++)        {            I2C_Device_Address = I2C_Count << 1;            /* Enable I2C2 */            I2C_Enable(I2C2,ENABLE);            /* The software must wait until I2C Bus is idle */            I2C_Time = 0;            while( I2C_GetBitState(I2C2,I2C_FLAG_I2CBSY) && (I2C_Time < I2C_TimeOut) ) {I2C_Time++;}                        /* Send a start condition to I2C bus */            I2C_StartOnBus_Enable(I2C2,ENABLE);            /* The software must wait until SBSEND bit is set */            I2C_Time = 0;            while(!I2C_StateDetect(I2C2,I2C_PROGRAMMINGMODE_MASTER_SBSEND) && (I2C_Time < I2C_TimeOut) ) {I2C_Time++;}                                /* Send slave address to I2C bus */            I2C_AddressingDevice_7bit(I2C2,I2C_Device_Address,I2C_DIRECTION_TRANSMITTER);            /* The software must wait until ADDSEND bit is set*/            I2C_Found = 0; // default : not found I2C Device            I2C_Time = 0;            while( I2C_Time < I2C_TimeOut ) {                I2C_Time++;                if ( I2C_StateDetect(I2C2,I2C_PROGRAMMINGMODE_MASTER_TRANSMITTER_ADDSEND) ) // found I2C Device                {                    I2C_Found = 1;                    break; // break while()                }            }                                I2C_StopOnBus_Enable(I2C2,ENABLE);            I2C_Time = 0;            while( (I2C2->CTLR1&0x0200) && (I2C_Time < I2C_TimeOut) ) {I2C_Time++;}                        if ( I2C_Found )            {                printf("\r\n I2C Found : 0xX \n\r", I2C_Device_Address);                I2C_Found_Count++;            }            else            {                // printf("\r\n I2C Not Found : 0xX \n\r", I2C_Device_Address);            }                }                printf("\r\n Total Found I2C Device Number : %d \n\r", I2C_Found_Count);    while(1)    {          }}/* Private functions ---------------------------------------------------------*//**  * @brief  Retarget the C library printf function to the USART.  * @param  None  * @retval None  */PUTCHAR_PROTOTYPE{    /* Place your implementation of fputc here */    /* e.g. write a character to the USART */    USART_DataSend( EVAL_COM1 , (uint8_t) ch );    /* Loop until transmit data register is empty */    while (USART_GetBitState( EVAL_COM1 , USART_FLAG_TBE) == RESET)    {    }    return ch;}/**  * @brief  Configure USART1.  * @param  None  * @retval None  */void USART_Configuration(void){    USART_InitPara USART_InitStructure;    USART_DeInit( EVAL_COM1 );    USART_InitStructure.USART_BRR                   = 115200;    USART_InitStructure.USART_WL                    = USART_WL_8B;    USART_InitStructure.USART_STBits                = USART_STBITS_1;    USART_InitStructure.USART_Parity                = USART_PARITY_RESET;    USART_InitStructure.USART_HardwareFlowControl   = USART_HARDWAREFLOWCONTROL_NONE;    USART_InitStructure.USART_RxorTx                = USART_RXORTX_RX | USART_RXORTX_TX;    GD_EVAL_COMInit(&USART_InitStructure);    }/**  * @brief  Cofigure the I2C2 GPIO.  * @param  None  * @retval None  */void I2C2_GPIO_Configuration(void){    GPIO_InitPara GPIO_InitStructure;        /* Enable GPIO clock */    RCC_AHBPeriphClock_Enable( RCC_AHBPERIPH_GPIOF, ENABLE );        /* Configure I2C2 pins: SCL and SDA */    GPIO_InitStructure.GPIO_Pin =  GPIO_PIN_6 | GPIO_PIN_7; // SCL , SDA    GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AF;    GPIO_InitStructure.GPIO_OType = GPIO_OTYPE_OD;    GPIO_InitStructure.GPIO_PuPd = GPIO_PUPD_NOPULL;    GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ ;     GPIO_Init(GPIOF, &GPIO_InitStructure) ;       GPIO_PinAFConfig(GPIOF,GPIO_PINSOURCE6,GPIO_AF_0);    GPIO_PinAFConfig(GPIOF,GPIO_PINSOURCE7,GPIO_AF_0);}/**  * @brief  Cofigure the I2C2 interface.  * @param  None  * @retval None  */void I2C2_Configuration(void){    I2C_InitPara I2C_InitStructure;        I2C_DeInit(I2C2);        /* Enable I2C2 APB1 clock */    RCC_APB1PeriphClock_Enable( RCC_APB1PERIPH_I2C2, ENABLE );        /* I2C configuration */    I2C_InitStructure.I2C_Protocol        = I2C_PROTOCOL_I2C;    I2C_InitStructure.I2C_DutyCycle       = I2C_DUTYCYCLE_2;    I2C_InitStructure.I2C_BitRate         = I2C2_Speed;    I2C_InitStructure.I2C_AddressingMode  = I2C_ADDRESSING_MODE_7BIT;    I2C_InitStructure.I2C_DeviceAddress   = I2C_OWN_ADDRESS7;    I2C_Init(I2C2, &I2C_InitStructure);    /* Enable I2C2 */    I2C_Enable(I2C2, ENABLE );    /* Enable Acknowledge */    I2C_Acknowledge_Enable( I2C2 , ENABLE );}/******************* (C) COPYRIGHT 2016 GIGADEVICE *****END OF FILE****/https://www.eeboard.com/bbs/forum.php?mod=viewthrea...