主设备是IIc 总线正常 总线挂载的设备也正常,用I2Ctools detect无法找到地址。
正常情况下,主设备是可以detect到总线上的地址的
2.利用iic 示例程序 将i2c1 改为2,然后对应修改,修改为从模式,主机使用detect 命令无法detect到
3.硬件原理图如图所示:
4.代码见附件
/********************************** (C) COPYRIGHT ******************************* * File Name : main.c * Author : WCH * Version : V1.0.0 * Date : 2021/06/06 * Description : Main program body. ********************************************************************************* * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd. * Attention: This software (modified or not) and binary are used for * microcontroller manufactured by Nanjing Qinheng Microelectronics. *******************************************************************************/ /* *@Note 7-bit addressing mode, master/slave mode, transceiver routine: I2C1_SCL(PB8)\I2C1_SDA(PB9). This routine demonstrates that Master sends and Slave receives. Note: The two boards download the Master and Slave programs respectively, and power on at the same time. Hardware connection:PB8 -- PB8 PB9 -- PB9 */ #include "debug.h" /* I2C Mode Definition */ #define HOST_MODE 0 #define SLAVE_MODE 1 #define CLOSE_IIC 2 /* I2C Communication Mode Selection */ //#define I2C_MODE HOST_MODE #define I2C_MODE SLAVE_MODE //#define I2C_MODE CLOSE_IIC /* Global define */ #define Size 6 #define RXAdderss 0x22 #define TxAdderss 0x22 /* Global Variable */ u8 TxData[Size] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 }; u8 RxData[5][Size]; /********************************************************************* * @fn IIC_Init * * @brief Initializes the IIC peripheral. * * @return none */ void IIC_Init(u32 bound, u16 address) { GPIO_InitTypeDef GPIO_InitStructure={0}; I2C_InitTypeDef I2C_InitTSturcture={0}; RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE ); //GPIO_PinRemapConfig(GPIO_Remap_I2C1, ENABLE); RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C2, ENABLE ); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOB, &GPIO_InitStructure ); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOB, &GPIO_InitStructure ); I2C_InitTSturcture.I2C_ClockSpeed = bound; I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C; I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_16_9; I2C_InitTSturcture.I2C_OwnAddress1 = address; I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable; I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_Init( I2C2, &I2C_InitTSturcture ); I2C_Cmd( I2C2, ENABLE ); //I2C_AcknowledgeConfig( I2C2, ENABLE ); } /********************************************************************* * @fn main * * @brief Main program. * * @return none */ int main(void) { u8 i = 0; u8 j = 0; u8 p = 0; Delay_Init(); USART_Printf_Init( 115200 ); printf( "SystemClk:%d\r\n", SystemCoreClock ); #if (I2C_MODE == HOST_MODE) printf("IIC Host mode\r\n"); IIC_Init( 80000, TxAdderss); for( j =0; j < 5; j++) { while( I2C_GetFlagStatus( I2C2, I2C_FLAG_BUSY ) != RESET ); I2C_GenerateSTART( I2C2, ENABLE ); while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_MODE_SELECT ) ); I2C_Send7bitAddress( I2C2, 0x02, I2C_Direction_Transmitter ); while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) ); for( i=0; i< 6;i++ ) { if( I2C_GetFlagStatus( I2C2, I2C_FLAG_TXE ) != RESET ) { Delay_Ms(100); I2C_SendData( I2C2, TxData[i] ); } } while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) ); I2C_GenerateSTOP( I2C2, ENABLE ); Delay_Ms(1000); } #elif (I2C_MODE == SLAVE_MODE) printf("IIC Slave mode\r\n"); IIC_Init( 80000, RXAdderss); for( p =0; p < 5; p++) { i = 0; while( !I2C_CheckEvent( I2C2, I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED ) ); printf("IIC I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED mode\r\n"); while( i < 6 ) { if( I2C_GetFlagStatus( I2C2, I2C_FLAG_RXNE ) != RESET ) { RxData[p][i] = I2C_ReceiveData( I2C2 ); i++; } } I2C2->CTLR1 &= I2C2->CTLR1; } printf( "RxData:\r\n" ); for(p=0; p<5; p++) { for( i = 0; i < 6; i++ ) { printf( "%02x ", RxData[p][i] ); } printf( "\r\n "); } #endif while(1) { Delay_Ms(5000); printf("iic fuck ~~\r\n"); } }
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