Subversion Repositories NaviCtrl

//--------------------------------------------------------------

void I2CBus_StateReset(I2C_TypeDef* I2Cx)

{

        volatile  I2C_Bus_t *pBus = NULL;

        I2C_InitTypeDef   I2C_Struct;

        GPIO_InitTypeDef  GPIO_InitStructure;

        u8 SCL_Pin = 0;

        u8 SDA_Pin = 0;

        u32 SCL_Clock = 0;

        u32 APBPeriph = 0;

        u8 VIC_Priority = 0;

        if (I2Cx == I2C0)

        {

                UART1_PutString("\r\n I2C0 Reset");

                SCL_Pin = GPIO_Pin_0;

                SDA_Pin = GPIO_Pin_1;

                SCL_Clock = I2C0_CLOCK;

                APBPeriph = __I2C0;

                VIC_Priority = PRIORITY_I2C0;

                pBus = &I2C0_Bus;

                pBus->pData = I2C0_Buffer;

                pBus->VIC_Source = I2C0_ITLine;        

        }

        if (I2Cx == I2C1)      

        {

                UART1_PutString("\r\n I2C1 Reset");

                SCL_Pin = GPIO_Pin_2;

                SDA_Pin = GPIO_Pin_3;

                SCL_Clock = I2C1_CLOCK;

                APBPeriph = __I2C1;

                VIC_Priority = PRIORITY_I2C1;

                pBus = &I2C1_Bus;

                pBus->pData = I2C1_Buffer;

                pBus->VIC_Source = I2C1_ITLine;        

        }

        if(pBus == NULL) return;

        pBus->State = I2C_STATE_UNDEF;

        pBus->Error = I2C_ERROR_UNKNOWN;

        pBus->Timeout = 0;

        pBus->TxBufferSize = 0;

        pBus->RxBufferSize = 0;

        pBus->Direction = 0;

        pBus->SlaveAddr = 0;

        pBus->pRxHandler = NULL;

        // enable Port 2 peripherie

        SCU_APBPeriphClockConfig(__GPIO2, ENABLE);

        // disable a reset state

        SCU_APBPeriphReset(__GPIO2, DISABLE);

        u8 i;

        u32 delay;

        // reconfigure I2C_CLKOUT and I2C_DOUT

        GPIO_StructInit(&GPIO_InitStructure);

        GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;

        GPIO_InitStructure.GPIO_Pin = SCL_Pin | SDA_Pin;

        GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;

        GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable;

        GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C_CLKOUT, I2C_DOUT

        GPIO_Init(GPIO2, &GPIO_InitStructure);

        // enable I2C peripherie

        SCU_APBPeriphClockConfig(APBPeriph, ENABLE);

        // reset I2C peripherie

        SCU_APBPeriphReset(APBPeriph, ENABLE);

        SCU_APBPeriphReset(APBPeriph, DISABLE);

        I2C_DeInit(I2Cx);

        I2C_StructInit(&I2C_Struct);

        I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable;

        I2C_Struct.I2C_Ack = I2C_Ack_Enable;

        I2C_Struct.I2C_CLKSpeed = SCL_Clock;

        I2C_Struct.I2C_OwnAddress = 0x00;

        I2C_Init(I2Cx, &I2C_Struct);

        I2C_Cmd(I2Cx, ENABLE);

        I2C_ITConfig(I2Cx, ENABLE);

        VIC_Config(pBus->VIC_Source, VIC_IRQ , VIC_Priority);

        pBus->Timeout = SetDelay(2*I2C_TIMEOUT);

        I2C_GenerateSTOP(I2Cx, ENABLE);

        pBus->State = I2C_STATE_IDLE;

        // start some dummy transmissions cycles

        // to get the irq routine to work

        for(i = 0; i < 2; i++)

        {

                pBus->State = I2C_STATE_BUFFBUSY;

                I2CBus_Transmission(I2Cx, 0, NULL, 1, 0, 0); // transfer 1 byte in the isr

                if(I2CBus_WaitForEndOfTransmission(I2Cx, 2)) break;

        }