TMC32_QJB/IIC/iic_main.c

/********************************************************************************
* Copyright (c) 2012, Beijing Tongfang Microelectroics Co., Ltd.
* All rights reserved.
* Module: I2C
* Author: yanghf
* Version: V1.0
* History:
* 2016-05-22 Original version
********************************************************************************/

#include "global.h"

uint8_t I2C2_RevBuff[100];
uint8_t I2C2_RevCnt = 0;
uint8_t I2C2_RevState = 0;  // 0:未开始, 1:接收到start, 2:接收数据中, 3:接收到stop.


void AppIICSlaveInit(void)
{
	GPIO_InitTypeDef GPIO_IIC_Init;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_I2C,ENABLE);	/* Open I2C clock */
	
	GPIO_IIC_Init.Pin = GPIO_PIN_13|GPIO_PIN_14; 				/*选择GPIO*/
	GPIO_IIC_Init.Pull = GPIO_NOPULL;							/*选择GPIO 不上拉 不下拉 I2C的SDA 和SCL 需要外加上拉电阻*/
	GPIO_IIC_Init.Mode = GPIO_MODE_AF;							/*选择GPIO 的模式 AF*/ 
	GPIO_IIC_Init.Speed = GPIO_HIGH_SPEED;						/*设置GPIO的驱动能力 */  
	GPIO_Init(GPIOC, &GPIO_IIC_Init);						/*设置GPIOC的初始化*/
	
	GPIO_PinAFConfig(GPIOC, GPIO_PIN_Source13, GPIO_AF4_I2C); /*设置GPIOB_5的AF 模式 为AF1*/
	GPIO_PinAFConfig(GPIOC, GPIO_PIN_Source14, GPIO_AF4_I2C); /*设置GPIOB_6的AF 模式 为AF1*/	
	IIC_Slave_CFG(I2C,I2C_CTRL_SCLCLOCK_PCLK_256,0x28);  //0x01(设置slave 时的 地址值)
	I2C->MSK = 0;
 	I2C->CON |= I2C_CTRL_AA_MASK;
	I2C->CON &= ~I2C_CTRL_SI_MASK;
	NVIC_ClearPendingIRQ(I2C_IRQn);
	NVIC_EnableIRQ(I2C_IRQn);
}
/***************************************************************************
* Function: I2C_Init
* Description: I2C init
* Input: 
1)I2Cx:
I2C1
I2C2
2)clock_speed
I2C_CTRL_SCLCLOCK_PCLK_256
I2C_CTRL_SCLCLOCK_PCLK_224
I2C_CTRL_SCLCLOCK_PCLK_192
I2C_CTRL_SCLCLOCK_PCLK_160
I2C_CTRL_SCLCLOCK_PCLK_960
I2C_CTRL_SCLCLOCK_PCLK_120
I2C_CTRL_SCLCLOCK_PCLK_60
I2C_CTRL_SCLCLOCK_BCLK_8

3)ser_addess：   address in slave mode 
* Output: NULL
* Return: void	
* Other:  NULL
**************************************************************************/
void IIC_Slave_CFG(I2C_TypeDef* I2Cx, uint8_t clock_speed,uint8_t ser_address)
{
	I2Cx->CON &= ~I2C_CTRL_ENS1_MASK; /* Reset I2C hardware. */
	I2Cx->CON = I2C_CTRL_ENS1_MASK | clock_speed; /* set enable bit  and clock_speed*/
	I2Cx->ADDR0 = ser_address<<1;
}

/***************************************************************************
* Function: I2C_Slave_ReceiveBytes
* Description: receive bytes in slave mode
* Input: 
1)I2Cx:
I2C1
I2C2
2)bytes ：receive bytes

3)lens 

* Output: NULL
* Return: void	
* Other:  NULL
**************************************************************************/
void I2C_Slave_ReceiveBytes(I2C_TypeDef* I2Cx,uint8_t *bytes,uint16_t lens)
{
	uint8_t status;
	uint16_t i;
	
	I2Cx->CON |= I2C_CTRL_AA_MASK;
	I2Cx->CON &= ~I2C_CTRL_SI_MASK;
	
	while(1)
	{
		status = I2Cx->STS;
		if((status == STAT_SLAVE_SLAW) || (status == STAT_GCA))
			break;
	}
	
	for(i=0;i<lens;i++)
	{
		I2Cx->CON |= I2C_CTRL_AA_MASK;
		I2Cx->CON &= ~I2C_CTRL_SI_MASK;
		while(1)
		{
			status = I2Cx->STS;
			if((status == STAT_RDATA) || (status == STAT_GCA_ACK))
				break;
		}
		bytes[i] = I2Cx->DATA;
	}
	I2Cx->CON &= ~I2C_CTRL_SI_MASK;
	while(1)
	{
		status = I2Cx->STS;
		if(status == STAT_RSTOP)
			break;
	}
	
	I2Cx->CON |= I2C_CTRL_AA_MASK;
	I2Cx->CON &= ~I2C_CTRL_SI_MASK;
	status = I2Cx->STS;

}

/***************************************************************************
* Function: I2C_Slave_SendBytes
* Description: send bytes in slave mode
* Input: 
1)I2Cx:
I2C1
I2C2
2)bytes ：send bytes

3)lens 

* Output: NULL
* Return: void	
* Other:  NULL
**************************************************************************/

void I2C_Slave_SendBytes(I2C_TypeDef* I2Cx,uint8_t *bytes,uint16_t lens)
{
	uint8_t status;
	uint16_t i;
	
 	I2Cx->CON |= I2C_CTRL_AA_MASK;
	I2Cx->CON &= ~I2C_CTRL_SI_MASK;
	
										           
	//TMC_GPIO_WritePin(GPIOC,GPIO_PIN_8,GPIO_PIN_RESET);
    GPIO_ResetBits(GPIOC,GPIO_PIN_8);	
			
	while(1)
	{
		status = I2Cx->STS;
		if(status == STAT_SLAVE_SLAR_ACK)
			break;
	}
	
	//bytes
	for(i=0;i<lens;i++)
	{
		if((i+1) >= lens)  //bytes+NAK
		{
			I2Cx->DATA = bytes[i];
			I2Cx->CON &= ~I2C_CTRL_AA_MASK;		
			I2Cx->CON &= ~I2C_CTRL_SI_MASK;
			while(1)
			{
				status = I2Cx->STS;
				if((status == STAT_SLAVE_RNACK)||(status == STAT_FINAL))
				{
					I2Cx->CON |= I2C_CTRL_AA_MASK;	
					I2Cx->CON &= ~I2C_CTRL_SI_MASK;
					break;
				}
			}
		}
		else  //bytes+ACK
		{
			I2Cx->DATA = bytes[i];
			I2Cx->CON &= ~I2C_CTRL_SI_MASK;
			while(1)
			{
				status = I2Cx->STS;
				if(status == STAT_RACK)
				{
					break;
				}
			}
		}
	}
	GPIO_SetBits(GPIOC,GPIO_PIN_8); 	
	NVIC_ClearPendingIRQ(I2C_IRQn);
	NVIC_EnableIRQ(I2C_IRQn);
	
}