I2C slave not ACK
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I have an issue with STM32F0 Discovery. I am using I2C1 (like master) to send start condition and address to I2C2 (slave) on the same board. I am able to generate propertly the signal but the IC2 (slave) is not able to generate an ACK on 9th clk
What's wrong? Here my code about the setup:
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void set_I2C(void){
GPIO_InitTypeDef GPIO_InitStructure; I2C_InitTypeDef I2C_InitStructure;RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); /* Configure the I2C clock source. The clock is derived from the HSI */ RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);//Configure pins: SCL and SDA ------------------
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; GPIO_Init(GPIOB, &GPIO_InitStructure);I2C_DeInit(I2C1);
I2C_Cmd(I2C1, DISABLE); I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable; I2C_InitStructure.I2C_DigitalFilter = 0x00; I2C_InitStructure.I2C_OwnAddress1 = 0x40; I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; //I2C_InitStructure.I2C_Timing = 0xA0120227; //I2C_InitStructure.I2C_Timing = 0x20310A0D; I2C_InitStructure.I2C_Timing =0xB0420F13; //100KHz (see page 529 - table 73 in the manual reference) I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;I2C_Init(I2C1, &I2C_InitStructure);
//I2C_NumberOfBytesConfig(I2C1, 8); //I2C_AutoEndCmd(I2C1, ENABLE);I2C_Cmd(I2C1, ENABLE);
//I2C_ITConfig(I2C1, I2C_FLAG_TXE, ENABLE);
//Set up of I2C2
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);// Configure the I2C clock source. The clock is derived from the HSI
//RCC_I2CCLKConfig(RCC_PCLKConfig());GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_1);//Configure pins: SCL and SDA ------------------
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; GPIO_Init(GPIOB, &GPIO_InitStructure);I2C_DeInit(I2C2);
I2C_Cmd(I2C2, DISABLE); I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Disable; I2C_InitStructure.I2C_DigitalFilter = 0x00; I2C_InitStructure.I2C_OwnAddress1 = 0x30; // MPU6050 7-bit adress = 0x68, 8-bit adress = 0xD0; I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;I2C_InitStructure.I2C_Timing =0xB0420F13;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;I2C_Init(I2C2, &I2C_InitStructure);
//I2C_NumberOfBytesConfig(I2C1, 8); //I2C_AutoEndCmd(I2C1, ENABLE);I2C_Cmd(I2C2, ENABLE);
/*I2C2->CR1&=~I2C_OAR1_OA1EN;
I2C2->CR1&=~I2C_OAR2_OA2EN; I2C2->CR1|=I2C_CR1_SBC; //Slave Byte Control I2C_GeneralCallCmd(I2C2, ENABLE); I2C2->CR1|=I2C_CR1_ADDRIE; I2C2->CR2&=~I2C_CR2_NACK; I2C2->OAR1|=I2C_OAR1_OA1EN;*//*I2C_Cmd(I2C2, DISABLE);
I2C2->CR1|=I2C_CR1_SBC; //Slave Byte Control I2C_Cmd(I2C2, ENABLE); I2C_StretchClockCmd(I2C1, DISABLE);*/I2C_ITConfig(I2C2, I2C_AcknowledgedAddress_7bit, ENABLE);
/*I2C_ITConfig(I2C2, I2C_ISR_ADDR, ENABLE); I2C_ITConfig(I2C2, IS_I2C_ACKNOWLEDGE_ADDRESS(0x30), ENABLE); I2C_AcknowledgeConfig(I2C2, ENABLE); */NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the I2C2 interrupt priority */ NVIC_InitStructure.NVIC_IRQChannel = I2C2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPriority=1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } #i2c-stm32f0discovery