基于GD32F190的I2C总线扫描

jackh · 发表于 2016-6-12 11:36:11

[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 // 100KHz
uint8_t I2C_Count = 0; // 0~127 : number of I2C devise
uint16_t I2C_Device_Address = 0x0; // (from 0x00 to 0x7F)<<1
uint16_t I2C_TimeOut = 0xFFFF;
uint16_t I2C_Time = 0;
uint8_t I2C_Found = 0; // 0:not found 1:found
uint8_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 : 0x%02X \n\r", I2C_Device_Address);
I2C_Found_Count++;
}
else
{
// printf("\r\n I2C Not Found : 0x%02X \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****/

复制代码

I2C_scan_main.zip (2.2 KB, 下载次数: 16)

小苹果-344714 · 发表于 2016-6-12 17:22:51

真不错，学习学习啦！

糖悦之果飞 · 发表于 2016-6-29 09:09:57

文章不错，将内容去经验频道一并发一下，可以有双重奖励哟http://jingyan.eeboard.com/

ginleen · 发表于 2016-8-13 11:54:41

糖悦之果飞发表于 2016-6-29 09:09
文章不错，将内容去经验频道一并发一下，可以有双重奖励哟http://jingyan.eeboard.com/ ...

谢谢分享，现在到处划拉1x0的IIC 啊

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