/***********************************************************************//**
* @file lpc17xx_i2c.c
* @brief Contains all functions support for I2C firmware library on LPC17xx
* @version 2.0
* @date 21. May. 2010
* @author NXP MCU SW Application Team
**************************************************************************
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* products. This software is supplied "AS IS" without any warranties.
* NXP Semiconductors assumes no responsibility or liability for the
* use of the software, conveys no license or title under any patent,
* copyright, or mask work right to the product. NXP Semiconductors
* reserves the right to make changes in the software without
* notification. NXP Semiconductors also make no representation or
* warranty that such application will be suitable for the specified
* use without further testing or modification.
**********************************************************************/
/* Peripheral group ----------------------------------------------------------- */
/** @addtogroup I2C
* @{
*/
/* Includes ------------------------------------------------------------------- */
#include <drivers/i2c.h>
#include <drivers/clkpwr.h>
#include <drivers/pinsel.h>
#include <drivers/PCA9535x.h>
#include <bsp.h>
#include <drivers/io.h>
/* If this source file built with example, the LPC17xx FW library configuration
* file in each example directory ("lpc17xx_libcfg.h") must be included,
* otherwise the default FW library configuration file must be included instead
*/
/* #ifdef __BUILD_WITH_EXAMPLE__
#include "lpc17xx_libcfg.h"
#else
#include "lpc17xx_libcfg_default.h"
#endif __BUILD_WITH_EXAMPLE__ */
#if BSP_I2C_EN
FlagStatus completed_I2C = RESET;
/* Private Types -------------------------------------------------------------- */
/** @defgroup I2C_Private_Types I2C Private Types
* @{
*/
/**
* @brief I2C device configuration structure type
*/
typedef struct
{
uint32_t txrx_setup; /* Transmission setup */
int32_t dir; /* Current direction phase, 0 - write, 1 - read */
} I2C_CFG_T;
/**
* @}
*/
/* Private Variables ---------------------------------------------------------- */
/**
* @brief II2C driver data for I2C0, I2C1 and I2C2
*/
static I2C_CFG_T i2cdat[3];
static uint32_t I2C_MasterComplete[3];
static uint32_t I2C_SlaveComplete[3];
static uint32_t I2C_MonitorBufferIndex;
/* Private Functions ---------------------------------------------------------- */
/* Get I2C number */
static int32_t I2C_getNum(I2C_TypeDef *I2Cx);
/* Generate a start condition on I2C bus (in master mode only) */
static uint32_t I2C_Start (I2C_TypeDef *I2Cx);
/* Generate a stop condition on I2C bus (in master mode only) */
static void I2C_Stop (I2C_TypeDef *I2Cx);
/* I2C send byte subroutine */
static uint32_t I2C_SendByte (I2C_TypeDef *I2Cx, uint8_t databyte);
/* I2C get byte subroutine */
static uint32_t I2C_GetByte (I2C_TypeDef *I2Cx, uint8_t *retdat, uint8_t ack);
/* I2C set clock (hz) */
static void I2C_SetClock (I2C_TypeDef *I2Cx, uint32_t target_clock);
/*--------------------------------------------------------------------------------*/
/********************************************************************//**
* @brief Convert from I2C peripheral to number
* @param[in] I2Cx: I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @return I2C number, could be: 0..2
*********************************************************************/
static int32_t I2C_getNum(I2C_TypeDef *I2Cx){
if (I2Cx == I2C0) {
return (0);
} else if (I2Cx == I2C1) {
return (1);
} else if (I2Cx == I2C2) {
return (2);
}
return (-1);
}
/********************************************************************//**
* @brief Generate a start condition on I2C bus (in master mode only)
* @param[in] I2Cx: I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @return value of I2C status register after generate a start condition
*********************************************************************/
static uint32_t I2C_Start (I2C_TypeDef *I2Cx)
{
I2Cx->I2CONSET = I2C_I2CONSET_STA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
// Wait for complete
while (!(I2Cx->I2CONSET & I2C_I2CONSET_SI));
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
}
/********************************************************************//**
* @brief Generate a stop condition on I2C bus (in master mode only)
* @param[in] I2Cx: I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @return None
*********************************************************************/
static void I2C_Stop (I2C_TypeDef *I2Cx)
{
/* Make sure start bit is not active */
if (I2Cx->I2CONSET & I2C_I2CONSET_STA)
{
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
}
I2Cx->I2CONSET = I2C_I2CONSET_STO | I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
}
/********************************************************************//**
* @brief Send a byte
* @param[in] I2Cx: I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @param[in] databyte: number of byte
* @return value of I2C status register after sending
*********************************************************************/
static uint32_t I2C_SendByte (I2C_TypeDef *I2Cx, uint8_t databyte)
{
/* Make sure start bit is not active */
if (I2Cx->I2CONSET & I2C_I2CONSET_STA)
{
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
}
I2Cx->I2DAT = databyte & I2C_I2DAT_BITMASK;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
while (!(I2Cx->I2CONSET & I2C_I2CONSET_SI));
return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
}
/********************************************************************//**
* @brief Get a byte
* @param[in] I2Cx: I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @param[out] retdat pointer to return data
* @param[in] ack assert acknowledge or not, should be: TRUE/FALSE
* @return value of I2C status register after sending
*********************************************************************/
static uint32_t I2C_GetByte (I2C_TypeDef *I2Cx, uint8_t *retdat, uint8_t ack)
{
if (ack == TRUE)
{
I2Cx->I2CONSET = I2C_I2CONSET_AA;
}
else
{
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC;
}
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
while (!(I2Cx->I2CONSET & I2C_I2CONSET_SI));
*retdat = (uint8_t) (I2Cx->I2DAT & I2C_I2DAT_BITMASK);
return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
}
/*********************************************************************//**
* @brief Setup clock rate for I2C peripheral
* @param[in] I2Cx I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @param[in] target_clock : clock of SSP (Hz)
* @return None
***********************************************************************/
static void I2C_SetClock (I2C_TypeDef *I2Cx, uint32_t target_clock)
{
uint32_t temp;
//CHECK_PARAM(PARAM_I2Cx(I2Cx));
// Get PCLK of I2C controller
if (I2Cx == I2C0)
{
temp = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_I2C0) / target_clock;
}
else if (I2Cx == I2C1)
{
temp = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_I2C1) / target_clock;
}
else if (I2Cx == I2C2)
{
temp = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_I2C1) / target_clock;
}
/* Set the I2C clock value to register */
I2Cx->I2SCLH = (uint32_t)(temp / 2);
I2Cx->I2SCLL = (uint32_t)(temp - I2Cx->I2SCLH);
}
/* End of Private Functions --------------------------------------------------- */
/* Public Functions ----------------------------------------------------------- */
/** @addtogroup I2C_Public_Functions
* @{
*/
/********************************************************************//**
* @brief Initializes the I2Cx peripheral with specified parameter.
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @param[in] clockrate Target clock rate value to initialized I2C
* peripheral (Hz)
* @return None
*********************************************************************/
void I2C_Init(I2C_TypeDef *I2Cx, uint32_t clockrate)
{
//CHECK_PARAM(PARAM_I2Cx(I2Cx));
if (I2Cx==I2C0)
{
/* Set up clock and power for I2C0 module */
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C0, ENABLE);
/* As default, peripheral clock for I2C0 module
* is set to FCCLK / 2 */
CLKPWR_SetPCLKDiv(CLKPWR_PCLKSEL_I2C0, CLKPWR_PCLKSEL_CCLK_DIV_2);
//Select SDA0 and SCL0 pins
PINSEL_SetPinFunc(PINSEL_PORT_0, PINSEL_PIN_27, PINSEL_FUNC_1);
PINSEL_SetPinFunc(PINSEL_PORT_0, PINSEL_PIN_28, PINSEL_FUNC_1);
PINSEL_SetI2C0Pins(PINSEL_I2C_Normal_Mode, ENABLE);
/*clear SI and STA flags*/
I2Cx->I2CONCLR |= I2C_I2CONCLR_SIC;
I2Cx->I2CONCLR |= I2C_I2CONCLR_STAC;
}
else if (I2Cx==I2C1)
{
/* Set up clock and power for I2C1 module */
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C1, ENABLE);
/* As default, peripheral clock for I2C1 module
* is set to FCCLK / 2 */
CLKPWR_SetPCLKDiv(CLKPWR_PCLKSEL_I2C1, CLKPWR_PCLKSEL_CCLK_DIV_2);
}
else if (I2Cx==I2C2)
{
/* Set up clock and power for I2C2 module */
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C2, ENABLE);
/* As default, peripheral clock for I2C2 module
* is set to FCCLK / 2 */
CLKPWR_SetPCLKDiv(CLKPWR_PCLKSEL_I2C2, CLKPWR_PCLKSEL_CCLK_DIV_2);
}
else {
// Up-Support this device
return;
}
/* Set clock rate */
I2C_SetClock(I2Cx, clockrate);
/* Set I2C operation to default */
I2Cx->I2CONCLR = (I2C_I2CONCLR_AAC | I2C_I2CONCLR_STAC | I2C_I2CONCLR_I2ENC);
PINCON->I2CPADCFG &=~(1<<0)|(1<<1)|(1<<2)|(1<<3);
}
/*********************************************************************//**
* @brief De-initializes the I2C peripheral registers to their
* default reset values.
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @return None
**********************************************************************/
void I2C_DeInit(I2C_TypeDef* I2Cx)
{
//CHECK_PARAM(PARAM_I2Cx(I2Cx));
/* Disable I2C control */
I2Cx->I2CONCLR = I2C_I2CONCLR_I2ENC;
if (I2Cx==I2C0)
{
/* Disable power for I2C0 module */
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C0, DISABLE);
}
else if (I2Cx==I2C1)
{
/* Disable power for I2C1 module */
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C1, DISABLE);
}
else if (I2Cx==I2C2)
{
/* Disable power for I2C2 module */
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C2, DISABLE);
}
}
/*********************************************************************//**
* @brief Enable or disable I2C peripheral's operation
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @param[in] NewState New State of I2Cx peripheral's operation
* @return none
**********************************************************************/
void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
//CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
//CHECK_PARAM(PARAM_I2Cx(I2Cx));
if (NewState == ENABLE)
{
I2Cx->I2CONSET = I2C_I2CONSET_I2EN;
}
else
{
I2Cx->I2CONCLR = I2C_I2CONCLR_I2ENC;
}
}
/*********************************************************************//**
* @brief Enable/Disable interrupt for I2C peripheral
* @param[in] I2Cx I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @param[in] NewState New State of I2C peripheral interrupt in NVIC core
* should be:
* - ENABLE: enable interrupt for this I2C peripheral
* - DISABLE: disable interrupt for this I2C peripheral
* @return None
**********************************************************************/
void I2C_IntCmd (I2C_TypeDef *I2Cx, uint8_t NewState)
{
if (NewState)
{
if(I2Cx == I2C0)
{
NVIC_EnableIRQ(I2C0_IRQn);
}
else if (I2Cx == I2C1)
{
NVIC_EnableIRQ(I2C1_IRQn);
}
else if (I2Cx == I2C2)
{
NVIC_EnableIRQ(I2C2_IRQn);
}
}
else
{
if(I2Cx == I2C0)
{
NVIC_DisableIRQ(I2C0_IRQn);
}
else if (I2Cx == I2C1)
{
NVIC_DisableIRQ(I2C1_IRQn);
}
else if (I2Cx == I2C2)
{
NVIC_DisableIRQ(I2C2_IRQn);
}
}
return;
}
/*********************************************************************//**
* @brief General Master Interrupt handler for I2C peripheral
* @param[in] I2Cx I2C peripheral selected, should be:
* - LPC_I2C
* - I2C1
* - I2C2
* @return None
**********************************************************************/
void I2C_MasterHandler (I2C_TypeDef *I2Cx)
{
int32_t tmp;
uint8_t returnCode;
I2C_M_SETUP_Type *txrx_setup;
tmp = I2C_getNum(I2Cx);
txrx_setup = (I2C_M_SETUP_Type *) i2cdat[tmp].txrx_setup;
returnCode = (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
// Save current status
txrx_setup->status = returnCode;
// there's no relevant information
if (returnCode == I2C_I2STAT_NO_INF){
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
return;
}
/* ----------------------------- TRANSMIT PHASE --------------------------*/
if (i2cdat[tmp].dir == 0){
switch (returnCode)
{
/* A start/repeat start condition has been transmitted -------------------*/
case I2C_I2STAT_M_TX_START:
case I2C_I2STAT_M_TX_RESTART:
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
/*
* If there's any transmit data, then start to
* send SLA+W right now, otherwise check whether if there's
* any receive data for next state.
*/
if ((txrx_setup->tx_data != NULL) && (txrx_setup->tx_length != 0)){
I2Cx->I2DAT = (txrx_setup->sl_addr7bit << 1);
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
} else {
goto next_stage;
}
break;
/* SLA+W has been transmitted, ACK has been received ----------------------*/
case I2C_I2STAT_M_TX_SLAW_ACK:
/* Data has been transmitted, ACK has been received */
case I2C_I2STAT_M_TX_DAT_ACK:
/* Send more data */
if ((txrx_setup->tx_count < txrx_setup->tx_length) \
&& (txrx_setup->tx_data != NULL)){
I2Cx->I2DAT = *(uint8_t *)(txrx_setup->tx_data + txrx_setup->tx_count);
txrx_setup->tx_count++;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
}
// no more data, switch to next stage
else {
next_stage:
// change direction
i2cdat[tmp].dir = 1;
// Check if any data to receive
if ((txrx_setup->rx_length != 0) && (txrx_setup->rx_data != NULL)){
// check whether if we need to issue an repeat start
if ((txrx_setup->tx_length != 0) && (txrx_setup->tx_data != NULL)){
// Send out an repeat start command
I2Cx->I2CONSET = I2C_I2CONSET_STA;
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC | I2C_I2CONCLR_SIC;
}
// Don't need issue an repeat start, just goto send SLA+R
else {
goto send_slar;
}
}
// no more data send, the go to end stage now
else {
// success, goto end stage
txrx_setup->status |= I2C_SETUP_STATUS_DONE;
goto end_stage;
}
}
break;
/* SLA+W has been transmitted, NACK has been received ----------------------*/
case I2C_I2STAT_M_TX_SLAW_NACK:
/* Data has been transmitted, NACK has been received -----------------------*/
case I2C_I2STAT_M_TX_DAT_NACK:
// update status
txrx_setup->status |= I2C_SETUP_STATUS_NOACKF;
goto retry;
/* Arbitration lost in SLA+R/W or Data bytes -------------------------------*/
case I2C_I2STAT_M_TX_ARB_LOST:
// update status
txrx_setup->status |= I2C_SETUP_STATUS_ARBF;
default:
goto retry;
}
}
/* ----------------------------- RECEIVE PHASE --------------------------*/
else if (i2cdat[tmp].dir == 1){
switch (returnCode){
/* A start/repeat start condition has been transmitted ---------------------*/
case I2C_I2STAT_M_RX_START:
case I2C_I2STAT_M_RX_RESTART:
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
/*
* If there's any receive data, then start to
* send SLA+R right now, otherwise check whether if there's
* any receive data for end of state.
*/
if ((txrx_setup->rx_data != NULL) && (txrx_setup->rx_length != 0)){
send_slar:
I2Cx->I2DAT = (txrx_setup->sl_addr7bit << 1) | 0x01;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
} else {
// Success, goto end stage
txrx_setup->status |= I2C_SETUP_STATUS_DONE;
goto end_stage;
}
break;
/* SLA+R has been transmitted, ACK has been received -----------------*/
case I2C_I2STAT_M_RX_SLAR_ACK:
if (txrx_setup->rx_count < (txrx_setup->rx_length - 1)) {
/*Data will be received, ACK will be return*/
I2Cx->I2CONSET = I2C_I2CONSET_AA;
}
else {
/*Last data will be received, NACK will be return*/
I2Cx->I2CONCLR = I2C_I2CONSET_AA;
}
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Data has been received, ACK has been returned ----------------------*/
case I2C_I2STAT_M_RX_DAT_ACK:
// Note save data and increase counter first, then check later
/* Save data */
if ((txrx_setup->rx_data != NULL) && (txrx_setup->rx_count < txrx_setup->rx_length)){
*(uint8_t *)(txrx_setup->rx_data + txrx_setup->rx_count) = (I2Cx->I2DAT & I2C_I2DAT_BITMASK);
txrx_setup->rx_count++;
}
if (txrx_setup->rx_count < (txrx_setup->rx_length - 1)) {
/*Data will be received, ACK will be return*/
I2Cx->I2CONSET = I2C_I2CONSET_AA;
}
else {
/*Last data will be received, NACK will be return*/
I2Cx->I2CONCLR = I2C_I2CONSET_AA;
}
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Data has been received, NACK has been return -------------------------*/
case I2C_I2STAT_M_RX_DAT_NACK:
/* Save the last data */
if ((txrx_setup->rx_data != NULL) && (txrx_setup->rx_count < txrx_setup->rx_length)){
*(uint8_t *)(txrx_setup->rx_data + txrx_setup->rx_count) = (I2Cx->I2DAT & I2C_I2DAT_BITMASK);
txrx_setup->rx_count++;
}
// success, go to end stage
txrx_setup->status |= I2C_SETUP_STATUS_DONE;
goto end_stage;
/* SLA+R has been transmitted, NACK has been received ------------------*/
case I2C_I2STAT_M_RX_SLAR_NACK:
// update status
txrx_setup->status |= I2C_SETUP_STATUS_NOACKF;
goto retry;
/* Arbitration lost ----------------------------------------------------*/
case I2C_I2STAT_M_RX_ARB_LOST:
// update status
txrx_setup->status |= I2C_SETUP_STATUS_ARBF;
default:
retry:
// check if retransmission is available
if (txrx_setup->retransmissions_count < txrx_setup->retransmissions_max){
// Clear tx count
txrx_setup->tx_count = 0;
I2Cx->I2CONSET = I2C_I2CONSET_STA;
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC | I2C_I2CONCLR_SIC;
txrx_setup->retransmissions_count++;
}
// End of stage
else {
end_stage:
// Disable interrupt
I2C_IntCmd(I2Cx, 0);
// Send stop
I2C_Stop(I2Cx);
I2C_MasterComplete[tmp] = TRUE;
}
break;
}
}
}
/*********************************************************************//**
* @brief General Slave Interrupt handler for I2C peripheral
* @param[in] I2Cx I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @return None
**********************************************************************/
void I2C_SlaveHandler (I2C_TypeDef *I2Cx)
{
int32_t tmp;
uint8_t returnCode;
I2C_S_SETUP_Type *txrx_setup;
uint32_t timeout;
tmp = I2C_getNum(I2Cx);
txrx_setup = (I2C_S_SETUP_Type *) i2cdat[tmp].txrx_setup;
returnCode = (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
// Save current status
txrx_setup->status = returnCode;
// there's no relevant information
if (returnCode == I2C_I2STAT_NO_INF){
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
return;
}
switch (returnCode)
{
/* No status information */
case I2C_I2STAT_NO_INF:
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Reading phase -------------------------------------------------------- */
/* Own SLA+R has been received, ACK has been returned */
case I2C_I2STAT_S_RX_SLAW_ACK:
/* General call address has been received, ACK has been returned */
case I2C_I2STAT_S_RX_GENCALL_ACK:
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Previously addressed with own SLA;
* DATA byte has been received;
* ACK has been returned */
case I2C_I2STAT_S_RX_PRE_SLA_DAT_ACK:
/* DATA has been received, ACK hasn been return */
case I2C_I2STAT_S_RX_PRE_GENCALL_DAT_ACK:
/*
* All data bytes that over-flow the specified receive
* data length, just ignore them.
*/
if ((txrx_setup->rx_count < txrx_setup->rx_length) \
&& (txrx_setup->rx_data != NULL)){
*(uint8_t *)(txrx_setup->rx_data + txrx_setup->rx_count) = (uint8_t)I2Cx->I2DAT;
txrx_setup->rx_count++;
}
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Previously addressed with own SLA;
* DATA byte has been received;
* NOT ACK has been returned */
case I2C_I2STAT_S_RX_PRE_SLA_DAT_NACK:
/* DATA has been received, NOT ACK has been returned */
case I2C_I2STAT_S_RX_PRE_GENCALL_DAT_NACK:
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/*
* Note that: Return code only let us know a stop condition mixed
* with a repeat start condition in the same code value.
* So we should provide a time-out. In case this is really a stop
* condition, this will return back after time out condition. Otherwise,
* next session that is slave receive data will be completed.
*/
/* A Stop or a repeat start condition */
case I2C_I2STAT_S_RX_STA_STO_SLVREC_SLVTRX:
// Temporally lock the interrupt for timeout condition
I2C_IntCmd(I2Cx, 0);
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
// enable time out
timeout = I2C_SLAVE_TIME_OUT;
while(1){
if (I2Cx->I2CONSET & I2C_I2CONSET_SI){
// re-Enable interrupt
I2C_IntCmd(I2Cx, 1);
break;
} else {
timeout--;
if (timeout == 0){
// timeout occur, it's really a stop condition
txrx_setup->status |= I2C_SETUP_STATUS_DONE;
goto s_int_end;
}
}
}
break;
/* Writing phase -------------------------------------------------------- */
/* Own SLA+R has been received, ACK has been returned */
case I2C_I2STAT_S_TX_SLAR_ACK:
/* Data has been transmitted, ACK has been received */
case I2C_I2STAT_S_TX_DAT_ACK:
/*
* All data bytes that over-flow the specified receive
* data length, just ignore them.
*/
if ((txrx_setup->tx_count < txrx_setup->tx_length) \
&& (txrx_setup->tx_data != NULL)){
I2Cx->I2DAT = *(uint8_t *) (txrx_setup->tx_data + txrx_setup->tx_count);
txrx_setup->tx_count++;
}
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Data has been transmitted, NACK has been received,
* that means there's no more data to send, exit now */
/*
* Note: Don't wait for stop event since in slave transmit mode,
* since there no proof lets us know when a stop signal has been received
* on slave side.
*/
case I2C_I2STAT_S_TX_DAT_NACK:
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
txrx_setup->status |= I2C_SETUP_STATUS_DONE;
goto s_int_end;
// Other status must be captured
default:
s_int_end:
// Disable interrupt
I2C_IntCmd(I2Cx, 0);
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC | I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
I2C_SlaveComplete[tmp] = TRUE;
break;
}
}
/*********************************************************************//**
* @brief Transmit and Receive data in master mode
* @param[in] I2Cx I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @param[in] TransferCfg Pointer to a I2C_M_SETUP_Type structure that
* contains specified information about the
* configuration for master transfer.
* @param[in] Opt a I2C_TRANSFER_OPT_Type type that selected for
* interrupt or polling mode.
* @return SUCCESS or ERROR
*
* Note:
* - In case of using I2C to transmit data only, either transmit length set to 0
* or transmit data pointer set to NULL.
* - In case of using I2C to receive data only, either receive length set to 0
* or receive data pointer set to NULL.
* - In case of using I2C to transmit followed by receive data, transmit length,
* transmit data pointer, receive length and receive data pointer should be set
* corresponding.
**********************************************************************/
Status I2C_MasterTransferData(I2C_TypeDef *I2Cx, I2C_M_SETUP_Type *TransferCfg, \
I2C_TRANSFER_OPT_Type Opt)
{
uint8_t *txdat;
uint8_t *rxdat;
uint32_t CodeStatus;
uint8_t tmp;
// reset all default state
txdat = (uint8_t *) TransferCfg->tx_data;
rxdat = (uint8_t *) TransferCfg->rx_data;
// Reset I2C setup value to default state
TransferCfg->tx_count = 0;
TransferCfg->rx_count = 0;
TransferCfg->status = 0;
if (Opt == I2C_TRANSFER_POLLING){
CodeStatus = 0;
/* First Start condition -------------------------------------------------------------- */
TransferCfg->retransmissions_count = 0;
retry:
// reset all default state
txdat = (uint8_t *) TransferCfg->tx_data;
rxdat = (uint8_t *) TransferCfg->rx_data;
// Reset I2C setup value to default state
TransferCfg->tx_count = 0;
TransferCfg->rx_count = 0;
if(CodeStatus == 0x20){
I2C_BusRelease(I2Cx);
}
CodeStatus = 0;
// Start command
CodeStatus = I2C_Start(I2Cx);
if ((CodeStatus != I2C_I2STAT_M_TX_START) \
&& (CodeStatus != I2C_I2STAT_M_TX_RESTART)){
TransferCfg->retransmissions_count++;
if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
// save status
TransferCfg->status = CodeStatus;
goto error;
} else {
goto retry;
}
}
/* In case of sending data first --------------------------------------------------- */
if ((TransferCfg->tx_length != 0) && (TransferCfg->tx_data != NULL)){
/* Send slave address + WR direction bit = 0 ----------------------------------- */
CodeStatus = I2C_SendByte(I2Cx, (TransferCfg->sl_addr7bit << 1));
if (CodeStatus != I2C_I2STAT_M_TX_SLAW_ACK){
TransferCfg->retransmissions_count++;
if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
// save status
TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_NOACKF;
goto error;
} else {
goto retry;
}
}
/* Send a number of data bytes ---------------------------------------- */
while (TransferCfg->tx_count < TransferCfg->tx_length)
{
CodeStatus = I2C_SendByte(I2Cx, *txdat);
if (CodeStatus != I2C_I2STAT_M_TX_DAT_ACK){
TransferCfg->retransmissions_count++;
if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
// save status
TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_NOACKF;
goto error;
} else {
goto retry;
}
}
txdat++;
TransferCfg->tx_count++;
}
}
/* Second Start condition (Repeat Start) ------------------------------------------- */
if ((TransferCfg->tx_length != 0) && (TransferCfg->tx_data != NULL) \
&& (TransferCfg->rx_length != 0) && (TransferCfg->rx_data != NULL)){
CodeStatus = I2C_Start(I2Cx);
if ((CodeStatus != I2C_I2STAT_M_RX_START) \
&& (CodeStatus != I2C_I2STAT_M_RX_RESTART)){
TransferCfg->retransmissions_count++;
if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
// Update status
TransferCfg->status = CodeStatus;
goto error;
} else {
goto retry;
}
}
}
/* Then, start reading after sending data -------------------------------------- */
if ((TransferCfg->rx_length != 0) && (TransferCfg->rx_data != NULL)){
/* Send slave address + RD direction bit = 1 ----------------------------------- */
CodeStatus = I2C_SendByte(I2Cx, ((TransferCfg->sl_addr7bit << 1) | 0x01));
if (CodeStatus != I2C_I2STAT_M_RX_SLAR_ACK){
TransferCfg->retransmissions_count++;
if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
// update status
TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_NOACKF;
goto error;
} else {
goto retry;
}
}
/* Receive a number of data bytes ------------------------------------------------- */
while (TransferCfg->rx_count < TransferCfg->rx_length){
/*
* Note that: if data length is only one, the master should not
* issue an ACK signal on bus after reading to avoid of next data frame
* on slave side
*/
if (TransferCfg->rx_count < (TransferCfg->rx_length - 1)){
// Issue an ACK signal for next data frame
CodeStatus = I2C_GetByte(I2Cx, &tmp, 1);
if (CodeStatus != I2C_I2STAT_M_RX_DAT_ACK){
TransferCfg->retransmissions_count++;
if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
// update status
TransferCfg->status = CodeStatus;
goto error;
} else {
goto retry;
}
}
} else {
// Do not issue an ACK signal
CodeStatus = I2C_GetByte(I2Cx, &tmp, 0);
if (CodeStatus != I2C_I2STAT_M_RX_DAT_NACK){
TransferCfg->retransmissions_count++;
if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
// update status
TransferCfg->status = CodeStatus;
goto error;
} else {
goto retry;
}
}
}
*rxdat++ = tmp;
TransferCfg->rx_count++;
}
}
/* Send STOP condition ------------------------------------------------- */
I2C_Stop(I2Cx);
return SUCCESS;
error:
// Send stop condition
I2C_Stop(I2Cx);
return ERROR;
}
else if (Opt == I2C_TRANSFER_INTERRUPT){
// Setup tx_rx data, callback and interrupt handler
tmp = I2C_getNum(I2Cx);
i2cdat[tmp].txrx_setup = (uint32_t) TransferCfg;
// Set direction phase, write first
i2cdat[tmp].dir = 0;
/* First Start condition -------------------------------------------------------------- */
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
I2Cx->I2CONSET = I2C_I2CONSET_STA;
I2C_IntCmd(I2Cx, 1);
return (SUCCESS);
}
return ERROR;
}
/*********************************************************************//**
* @brief Receive and Transmit data in slave mode
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @param[in] TransferCfg Pointer to a I2C_S_SETUP_Type structure that
* contains specified information about the
* configuration for master transfer.
* @param[in] Opt I2C_TRANSFER_OPT_Type type that selected for
* interrupt or polling mode.
* @return SUCCESS or ERROR
*
* Note:
* The mode of slave's operation depends on the command sent from master on
* the I2C bus. If the master send a SLA+W command, this sub-routine will
* use receive data length and receive data pointer. If the master send a SLA+R
* command, this sub-routine will use transmit data length and transmit data
* pointer.
* If the master issue an repeat start command or a stop command, the slave will
* enable an time out condition, during time out condition, if there's no activity
* on I2C bus, the slave will exit, otherwise (i.e. the master send a SLA+R/W),
* the slave then switch to relevant operation mode. The time out should be used
* because the return status code can not show difference from stop and repeat
* start command in slave operation.
* In case of the expected data length from master is greater than data length
* that slave can support:
* - In case of reading operation (from master): slave will return I2C_I2DAT_IDLE_CHAR
* value.
* - In case of writing operation (from master): slave will ignore remain data from master.
**********************************************************************/
Status I2C_SlaveTransferData(I2C_TypeDef *I2Cx, I2C_S_SETUP_Type *TransferCfg, \
I2C_TRANSFER_OPT_Type Opt)
{
uint8_t *txdat;
uint8_t *rxdat;
uint32_t CodeStatus;
uint32_t timeout;
int32_t time_en;
int32_t tmp;
// reset all default state
txdat = (uint8_t *) TransferCfg->tx_data;
rxdat = (uint8_t *) TransferCfg->rx_data;
// Reset I2C setup value to default state
TransferCfg->tx_count = 0;
TransferCfg->rx_count = 0;
TransferCfg->status = 0;
// Polling option
if (Opt == I2C_TRANSFER_POLLING){
/* Set AA bit to ACK command on I2C bus */
I2Cx->I2CONSET = I2C_I2CONSET_AA;
/* Clear SI bit to be ready ... */
I2Cx->I2CONCLR = (I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC);
time_en = 0;
timeout = 0;
while (1)
{
/* Check SI flag ready */
if (I2Cx->I2CONSET & I2C_I2CONSET_SI)
{
time_en = 0;
switch (CodeStatus = (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK))
{
/* No status information */
case I2C_I2STAT_NO_INF:
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Reading phase -------------------------------------------------------- */
/* Own SLA+R has been received, ACK has been returned */
case I2C_I2STAT_S_RX_SLAW_ACK:
/* General call address has been received, ACK has been returned */
case I2C_I2STAT_S_RX_GENCALL_ACK:
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Previously addressed with own SLA;
* DATA byte has been received;
* ACK has been returned */
case I2C_I2STAT_S_RX_PRE_SLA_DAT_ACK:
/* DATA has been received, ACK hasn been return */
case I2C_I2STAT_S_RX_PRE_GENCALL_DAT_ACK:
/*
* All data bytes that over-flow the specified receive
* data length, just ignore them.
*/
if ((TransferCfg->rx_count < TransferCfg->rx_length) \
&& (TransferCfg->rx_data != NULL)){
*rxdat++ = (uint8_t)I2Cx->I2DAT;
TransferCfg->rx_count++;
}
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Previously addressed with own SLA;
* DATA byte has been received;
* NOT ACK has been returned */
case I2C_I2STAT_S_RX_PRE_SLA_DAT_NACK:
/* DATA has been received, NOT ACK has been returned */
case I2C_I2STAT_S_RX_PRE_GENCALL_DAT_NACK:
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/*
* Note that: Return code only let us know a stop condition mixed
* with a repeat start condition in the same code value.
* So we should provide a time-out. In case this is really a stop
* condition, this will return back after time out condition. Otherwise,
* next session that is slave receive data will be completed.
*/
/* A Stop or a repeat start condition */
case I2C_I2STAT_S_RX_STA_STO_SLVREC_SLVTRX:
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
// enable time out
time_en = 1;
timeout = 0;
break;
/* Writing phase -------------------------------------------------------- */
/* Own SLA+R has been received, ACK has been returned */
case I2C_I2STAT_S_TX_SLAR_ACK:
/* Data has been transmitted, ACK has been received */
case I2C_I2STAT_S_TX_DAT_ACK:
/*
* All data bytes that over-flow the specified receive
* data length, just ignore them.
*/
if ((TransferCfg->tx_count < TransferCfg->tx_length) \
&& (TransferCfg->tx_data != NULL)){
I2Cx->I2DAT = *txdat++;
TransferCfg->tx_count++;
}
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
break;
/* Data has been transmitted, NACK has been received,
* that means there's no more data to send, exit now */
/*
* Note: Don't wait for stop event since in slave transmit mode,
* since there no proof lets us know when a stop signal has been received
* on slave side.
*/
case I2C_I2STAT_S_TX_DAT_NACK:
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
// enable time out
time_en = 1;
timeout = 0;
break;
// Other status must be captured
default:
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
goto s_error;
}
} else if (time_en){
if (timeout++ > I2C_SLAVE_TIME_OUT){
// it's really a stop condition, goto end stage
goto s_end_stage;
}
}
}
s_end_stage:
/* Clear AA bit to disable ACK on I2C bus */
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC;
// Check if there's no error during operation
// Update status
TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_DONE;
return SUCCESS;
s_error:
/* Clear AA bit to disable ACK on I2C bus */
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC;
// Update status
TransferCfg->status = CodeStatus;
return ERROR;
}
else if (Opt == I2C_TRANSFER_INTERRUPT){
// Setup tx_rx data, callback and interrupt handler
tmp = I2C_getNum(I2Cx);
i2cdat[tmp].txrx_setup = (uint32_t) TransferCfg;
// Set direction phase, read first
i2cdat[tmp].dir = 1;
// Enable AA
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
I2C_IntCmd(I2Cx, 1);
while (I2C_MasterComplete[0] == RESET);
return (SUCCESS);
}
return ERROR;
}
/*********************************************************************//**
* @brief Set Own slave address in I2C peripheral corresponding to
* parameter specified in OwnSlaveAddrConfigStruct.
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @param[in] OwnSlaveAddrConfigStruct Pointer to a I2C_OWNSLAVEADDR_CFG_Type
* structure that contains the configuration information for the
* specified I2C slave address.
* @return None
**********************************************************************/
void I2C_SetOwnSlaveAddr(I2C_TypeDef *I2Cx, I2C_OWNSLAVEADDR_CFG_Type *OwnSlaveAddrConfigStruct)
{
uint32_t tmp;
/*CHECK_PARAM(PARAM_I2Cx(I2Cx));
CHECK_PARAM(PARAM_I2C_SLAVEADDR_CH(OwnSlaveAddrConfigStruct->SlaveAddrChannel));
CHECK_PARAM(PARAM_FUNCTIONALSTATE(OwnSlaveAddrConfigStruct->GeneralCallState));*/
tmp = (((uint32_t)(OwnSlaveAddrConfigStruct->SlaveAddr_7bit << 1)) \
| ((OwnSlaveAddrConfigStruct->GeneralCallState == ENABLE) ? 0x01 : 0x00))& I2C_I2ADR_BITMASK;
switch (OwnSlaveAddrConfigStruct->SlaveAddrChannel)
{
case 0:
I2Cx->I2ADR0 = tmp;
I2Cx->I2MASK0 = I2C_I2MASK_MASK((uint32_t) \
(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
break;
case 1:
I2Cx->I2ADR1 = tmp;
I2Cx->I2MASK1 = I2C_I2MASK_MASK((uint32_t) \
(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
break;
case 2:
I2Cx->I2ADR2 = tmp;
I2Cx->I2MASK2 = I2C_I2MASK_MASK((uint32_t) \
(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
break;
case 3:
I2Cx->I2ADR3 = tmp;
I2Cx->I2MASK3 = I2C_I2MASK_MASK((uint32_t) \
(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
break;
}
}
/*********************************************************************//**
* @brief Configures functionality in I2C monitor mode
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @param[in] MonitorCfgType Monitor Configuration type, should be:
* - I2C_MONITOR_CFG_SCL_OUTPUT: I2C module can 'stretch'
* the clock line (hold it low) until it has had time to
* respond to an I2C interrupt.
* - I2C_MONITOR_CFG_MATCHALL: When this bit is set to '1'
* and the I2C is in monitor mode, an interrupt will be
* generated on ANY address received.
* @param[in] NewState New State of this function, should be:
* - ENABLE: Enable this function.
* - DISABLE: Disable this function.
* @return None
**********************************************************************/
void I2C_MonitorModeConfig(I2C_TypeDef *I2Cx, uint32_t MonitorCfgType, FunctionalState NewState)
{
CHECK_PARAM(PARAM_I2Cx(I2Cx));
CHECK_PARAM(PARAM_I2C_MONITOR_CFG(MonitorCfgType));
CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
if (NewState == ENABLE)
{
I2Cx->MMCTRL |= MonitorCfgType;
}
else
{
I2Cx->MMCTRL &= (~MonitorCfgType) & I2C_I2MMCTRL_BITMASK;
}
}
/*********************************************************************//**
* @brief Enable/Disable I2C monitor mode
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @param[in] NewState New State of this function, should be:
* - ENABLE: Enable monitor mode.
* - DISABLE: Disable monitor mode.
* @return None
**********************************************************************/
void I2C_MonitorModeCmd(I2C_TypeDef *I2Cx, FunctionalState NewState)
{
CHECK_PARAM(PARAM_I2Cx(I2Cx));
CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
if (NewState == ENABLE)
{
I2Cx->MMCTRL |= I2C_I2MMCTRL_MM_ENA;
I2Cx->I2CONSET = I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
}
else
{
I2Cx->MMCTRL &= (~I2C_I2MMCTRL_MM_ENA) & I2C_I2MMCTRL_BITMASK;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC | I2C_I2CONCLR_AAC;
}
I2C_MonitorBufferIndex = 0;
}
/*********************************************************************//**
* @brief Get data from I2C data buffer in monitor mode.
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @return None
* Note: In monitor mode, the I2C module may lose the ability to stretch
* the clock (stall the bus) if the ENA_SCL bit is not set. This means that
* the processor will have a limited amount of time to read the contents of
* the data received on the bus. If the processor reads the I2DAT shift
* register, as it ordinarily would, it could have only one bit-time to
* respond to the interrupt before the received data is overwritten by
* new data.
**********************************************************************/
uint8_t I2C_MonitorGetDatabuffer(I2C_TypeDef *I2Cx)
{
CHECK_PARAM(PARAM_I2Cx(I2Cx));
return ((uint8_t)(I2Cx->I2DATA_BUFFER));
}
/*********************************************************************//**
* @brief Get data from I2C data buffer in monitor mode.
* @param[in] I2Cx I2C peripheral selected, should be
* - I2C0
* - I2C1
* - I2C2
* @return None
* Note: In monitor mode, the I2C module may lose the ability to stretch
* the clock (stall the bus) if the ENA_SCL bit is not set. This means that
* the processor will have a limited amount of time to read the contents of
* the data received on the bus. If the processor reads the I2DAT shift
* register, as it ordinarily would, it could have only one bit-time to
* respond to the interrupt before the received data is overwritten by
* new data.
**********************************************************************/
uint8_t I2C_MonitorHandler(I2C_TypeDef *I2Cx, uint8_t *buffer, uint32_t size)
{
uint8_t ret=FALSE;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
buffer[I2C_MonitorBufferIndex] = (uint8_t)(I2Cx->I2DATA_BUFFER);
I2C_MonitorBufferIndex++;
if(I2C_MonitorBufferIndex >= size)
{
ret = TRUE;
}
return ret;
}
/*********************************************************************//**
* @brief Get status of Master Transfer
* @param[in] I2Cx I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @return Master transfer status, could be:
* - TRUE master transfer completed
* - FALSE master transfer have not completed yet
**********************************************************************/
uint32_t I2C_MasterTransferComplete(I2C_TypeDef *I2Cx)
{
uint32_t retval, tmp;
tmp = I2C_getNum(I2Cx);
retval = I2C_MasterComplete[tmp];
I2C_MasterComplete[tmp] = FALSE;
return retval;
}
/*********************************************************************//**
* @brief Get status of Slave Transfer
* @param[in] I2Cx I2C peripheral selected, should be:
* - I2C0
* - I2C1
* - I2C2
* @return Complete status, could be: TRUE/FALSE
**********************************************************************/
uint32_t I2C_SlaveTransferComplete(I2C_TypeDef *I2Cx)
{
uint32_t retval, tmp;
tmp = I2C_getNum(I2Cx);
retval = I2C_SlaveComplete[tmp];
I2C_SlaveComplete[tmp] = FALSE;
return retval;
}
void I2C_BusRelease(I2C_TypeDef *I2Cx){
port_pin_t I2C_SCL;
I2C_SCL.port = GPIO0;
I2C_SCL.pin = 28;
I2C_Stop(I2Cx);
I2C_DeInit(I2Cx);
//Init P0.28 as GPIO and force a dummy clock
gpio_init(&I2C_SCL,GPIO_OUTPUT);
gpio_clear(&I2C_SCL);
//re-init I2C0
I2C_Init(I2Cx, 0x186A0);
I2C_Cmd(I2Cx, ENABLE);
}
/* Interrupt handler subroutines for I2Cx*/
void I2C0_IRQHandler(void)
{
I2C_MasterHandler(I2C0);
if (I2C_MasterTransferComplete(I2C0)){
completed_I2C = SET;
}
}
void I2C1_IRQHandler(void)
{
I2C_MasterHandler(I2C1);
}
void I2C2_IRQHandler(void)
{
I2C_MasterHandler(I2C2);
}
/**
* @}
*/
#endif /* _I2C */
/**
* @}
*/
/* --------------------------------- End Of File ------------------------------ */
