MCU_SWM221/I2C/SimplI2C/APP/IOI2C_SLV.c

#include "SWM221.h"

#include "IOI2C_SLV.h"

static char TxBuff[128] = {0};
static uint32_t TxSize = 0;
static volatile uint32_t TxIndx = 0;

static char RxBuff[128] = {0};
static uint32_t RxSize = 128;			//<2F><><EFBFBD><EFBFBD><EFBFBD>ܽ<EFBFBD><DCBD><EFBFBD>128<32><38><EFBFBD>ֽ<EFBFBD>
static volatile uint32_t RxIndx = 0;

static volatile uint32_t BitTim = 0;

static volatile uint32_t IsBusy = 0;	//<2F><><EFBFBD>⵽Start<72><74>λ<EFBFBD><CEBB><EFBFBD><EFBFBD><EFBFBD>⵽Stop<6F><70><EFBFBD><EFBFBD>

static volatile uint32_t IsNACK = 0;	//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>յ<EFBFBD>NACK


static uint32_t RxBuff2[128] = {0};		//<2F><><EFBFBD>յ<EFBFBD>Stopʱ<70><CAB1>RxBuff<66><66><EFBFBD><EFBFBD><EFBFBD>ݰ<EFBFBD><DDB0>˵<EFBFBD><CBB5><EFBFBD><EFBFBD>Ȼ<EFA3AC><C8BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><D4BC><EFBFBD><EFBFBD><EFBFBD>RxBuff<66><66><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><CEBB><EFBFBD>û<EFBFBD><C3BB><EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD>RxBuff2<66>ж<EFBFBD><D0B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
static volatile uint32_t RxSize2 = 0;	//RxBuff2<66><32><EFBFBD>ж<EFBFBD><D0B6>ٸ<EFBFBD><D9B8><EFBFBD><EFBFBD>ݿ<EFBFBD><DDBF>Ա<EFBFBD><D4B1><EFBFBD><EFBFBD><EFBFBD>
static volatile uint32_t RxIndx2 = 0;

static void (*IOI2C_SLV_Func)(void);

static void IOI2C_SLV_SendByte(void);
static void IOI2C_SLV_ReadByte(void);

extern uint32_t IOI2C_SLV_EmptyCallback(char *TxBuff);

/****************************************************************************************************************************************** 
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:	IOI2C_SLV_Init()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>: IOI2C_SLV<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
* ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
******************************************************************************************************************************************/
void IOI2C_SLV_Init(void)
{
#define IOI2C_PORT	GPIOA
#define IOI2C_SCL	PIN2
#define IOI2C_SDA	PIN3
#define IOI2C_IRQ	GPIOA_IRQn
#define IOI2C_ISR	GPIOA_Handler
	
	GPIO_Init(IOI2C_PORT, IOI2C_SCL, 0, 1, 0, 1);
#define I2C_SCL_Value()		GPIO_GetBit(IOI2C_PORT, IOI2C_SCL)

	GPIO_Init(IOI2C_PORT, IOI2C_SDA, 0, 1, 0, 1);
#define I2C_SDA_OUTPUT()	IOI2C_PORT->DIR |= (1 << IOI2C_SDA);
#define I2C_SDA_LOW()		GPIO_ClrBit(IOI2C_PORT, IOI2C_SDA)
#define I2C_SDA_HIGH()		GPIO_SetBit(IOI2C_PORT, IOI2C_SDA)

#define I2C_SDA_INPUT()		IOI2C_PORT->DIR &=~(1 << IOI2C_SDA)
#define I2C_SDA_Value()		GPIO_GetBit(IOI2C_PORT, IOI2C_SDA)	
	
	
	EXTI_Init(IOI2C_PORT, IOI2C_SCL, EXTI_BOTH_EDGE);
	EXTI_Init(IOI2C_PORT, IOI2C_SDA, EXTI_BOTH_EDGE);
	
	NVIC_EnableIRQ(IOI2C_IRQ);
	
	EXTI_Open(IOI2C_PORT, IOI2C_SCL);
	EXTI_Open(IOI2C_PORT, IOI2C_SDA);
}

/****************************************************************************************************************************************** 
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:	IOI2C_SLV_RxNotEmpty()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>: IOI2C<EFBFBD>ӻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD>ȡ<EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: uint32_t		0 û<EFBFBD>п<EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>    >0 <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݸ<EFBFBD><EFBFBD><EFBFBD>
* ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
******************************************************************************************************************************************/
uint32_t IOI2C_SLV_RxNotEmpty(void)
{
	return RxSize2;
}

/****************************************************************************************************************************************** 
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:	IOI2C_SLV_FetchByte()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>IOI2C<EFBFBD>ӻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: char		ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>
* ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
******************************************************************************************************************************************/
char IOI2C_SLV_FetchByte(void)
{
	RxSize2 -= 1;
	
	return RxBuff2[RxIndx2++];
}

/****************************************************************************************************************************************** 
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:	IOI2C_SLV_FetchBytes()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>IOI2C<EFBFBD>ӻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>n<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: char buff[]		ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*			uint32_t len		Ҫȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݵĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD>IOI2C_SLV_RxNotEmpty()<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
* ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
******************************************************************************************************************************************/
void IOI2C_SLV_FetchBytes(char buff[], uint32_t len)
{
	uint32_t i;
	
	for(i = 0; i < len; i++)
		buff[i] = RxBuff2[RxIndx2+i];
	RxIndx2 += len;
	RxSize2 -= len;
}


static void IOI2C_SLV_SendByte(void)
{
	if(IsNACK == 1)
	{
		I2C_SDA_INPUT();
		
		goto noinc;
	}
	
	if(TxSize == 0)
	{
		TxSize = IOI2C_SLV_EmptyCallback(TxBuff);
		
		TxIndx = 0;
	}
	
	if(BitTim == 0)	I2C_SDA_OUTPUT();	//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ַ<EFBFBD>ʱ<EFBFBD>ὫSDA<44>г<EFBFBD><D0B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Խ<EFBFBD><D4BD><EFBFBD>ACK
	
	if(BitTim < 16)
	{
		if((BitTim % 2) == 0)
        {
			if(TxBuff[TxIndx] & (1 << (7 - BitTim/2)))
				I2C_SDA_HIGH();
			else
				I2C_SDA_LOW();
        }
	}
	else if(BitTim == 16)
	{
		I2C_SDA_INPUT();
	}
	else if(BitTim == 17)
	{
		if(I2C_SDA_Value())	//NACK
        {
            IsNACK = 1;
        }
        else
        {
            if(++TxIndx == TxSize)
            {
                TxIndx = TxSize - 1;
            }
        }
		
		BitTim = 0;
		goto noinc;
    }
	
	BitTim++;

noinc:
	;
}

static void IOI2C_SLV_ReadByte(void)
{
	if(BitTim == 0) I2C_SDA_INPUT();	//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ַ<EFBFBD>ʱ<EFBFBD>ὫSDA<44>г<EFBFBD><D0B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD><D4B7><EFBFBD>ACK
	
	if(BitTim < 16)
    {
        if((BitTim % 2) == 1)
        {
			if(I2C_SDA_Value() == 1)
				RxBuff[RxIndx] |=  (1 << (7 - BitTim/2));
			else
				RxBuff[RxIndx] &= ~(1 << (7 - BitTim/2));
        }
    }
    else if(BitTim == 16)
	{
		I2C_SDA_OUTPUT();
		
		if(++RxIndx < RxSize)
		{
			I2C_SDA_LOW();
		}
		else
		{
			I2C_SDA_HIGH();
		}
	}
	else if(BitTim == 17)
	{
		if((RxIndx == 1) && (RxBuff[0] & 0x01))
		{
			TxIndx = 0;
			
			IsNACK = 0;
			
			IOI2C_SLV_Func = IOI2C_SLV_SendByte;
		}
		
		BitTim = 0;
		goto noinc;
	}
	
	BitTim++;
	
noinc:
	;
}


/****************************************************************************************************************************************** 
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:	IOI2C_ISR()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>: IOI2C SCL<EFBFBD><EFBFBD>SDA<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
* ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
******************************************************************************************************************************************/
void IOI2C_ISR(void)
{		
	uint32_t i;
	
	if(EXTI_State(IOI2C_PORT, IOI2C_SDA))
	{
		EXTI_Clear(IOI2C_PORT, IOI2C_SDA);
		
		if(I2C_SCL_Value() == 1)			//ֻ<><D6BB><EFBFBD><EFBFBD>SCL<43>ߵ<EFBFBD>ƽʱSDA<44><41><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Start<72><74>Stop
		{
			if(I2C_SDA_Value() == 0)		//Start
			{
				RxIndx = 0;
				
				BitTim = 0;
				
				IsBusy = 1;
				
				IOI2C_SLV_Func = IOI2C_SLV_ReadByte;
			}
			else							//Stop
			{
				IsBusy = 0;
				
				for(i = 0; i < RxIndx-1; i++)
				{
					RxBuff2[i] = RxBuff[1+i];	//RxBuff[]<5D>е<EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ֽ<EFBFBD><D6BD>Ǵӻ<C7B4><D3BB><EFBFBD>ַ
				}
				RxSize2 = i;
				RxIndx2 = 0;
			}
		}
	}
	else if(EXTI_State(IOI2C_PORT, IOI2C_SCL))
	{
		EXTI_Clear(IOI2C_PORT, IOI2C_SCL);
		
		if(IsBusy) IOI2C_SLV_Func();
	}
}