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sdk-ameba-v4.0c_180328/component/common/mbed/targets/hal/rtl8711b/i2c_api.c

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2019-04-02 08:34:25 +00:00
/** mbed Microcontroller Library
******************************************************************************
* @file i2c_api.c
* @author
* @version V1.0.0
* @date 2016-08-01
* @brief This file provides mbed API for I2C.
******************************************************************************
* @attention
*
* This module is a confidential and proprietary property of RealTek and
* possession or use of this module requires written permission of RealTek.
*
* Copyright(c) 2016, Realtek Semiconductor Corporation. All rights reserved.
******************************************************************************
*/
#include "objects.h"
#include "PinNames.h"
#include "i2c_api.h"
#include "pinmap.h"
// See I2CSlave.h
#define NoData 0 // the slave has not been addressed
#define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
#define WriteGeneral 2 // the master is writing to all slave
#define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
static uint16_t i2c_target_addr[2];
extern u32 ConfigDebugErr;
extern u32 ConfigDebuginfo;
I2C_InitTypeDef I2CInitDat[2];
static u32 restart_enable = 0;
static u32 master_addr_retry = 1;
void i2c_send_restart(I2C_TypeDef *I2Cx, u8* pBuf, u8 len, u8 restart);
/**
* @brief Read data with special length in master mode through the I2Cx peripheral under in-house IP.
* @param I2Cx: where I2Cx can be I2C0_DEV or I2C1_DEV.
* @param pBuf: point to the buffer to hold the received data.
* @param len: the length of data that to be received.
* @note deal with condition that master send address while slave no ack
* @retval the length of data read.
*/
u8 I2C_MasterRead_Patch(I2C_TypeDef *I2Cx, u8* pBuf, u8 len)
{
u8 cnt = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
/* read in the DR register the data to be received */
for(cnt = 0; cnt < len; cnt++) {
if(cnt >= len - 1) {
/* generate stop singal */
I2Cx->IC_DATA_CMD = 0x0003 << 8;
} else {
I2Cx->IC_DATA_CMD = 0x0001 << 8;
}
/* wait for I2C_FLAG_RFNE flag */
while((I2C_CheckFlagState(I2Cx, BIT_IC_STATUS_RFNE)) == 0) {
if(I2C_GetRawINT(I2Cx) & BIT_IC_RAW_INTR_STAT_TX_ABRT) {
DBG_8195A(" TX_ABRT\n");
I2C_ClearAllINT(I2Cx);
return cnt;
}
}
*pBuf++ = (u8)I2Cx->IC_DATA_CMD;
}
return cnt;
}
/**
* @brief Write data with special length in master mode through the I2Cx peripheral under in-house IP.
* @param I2Cx: where I2Cx can be I2C0_DEV or I2C1_DEV.
* @param pBuf: point to the data to be transmitted.
* @param len: the length of data that send.
* @note deal with condition that master send address while slave no ack
* @retval the length of data send.
*/
u8 I2C_MasterWrite_Patch(I2C_TypeDef *I2Cx, u8* pBuf, u8 len)
{
u8 cnt = 0;
u8 temp = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
/* Write in the DR register the data to be sent */
for(cnt = 0; cnt < len; cnt++)
{
while((I2C_CheckFlagState(I2Cx, BIT_IC_STATUS_TFNF)) == 0);
if(cnt >= len - 1)
{
/*generate stop signal*/
I2Cx->IC_DATA_CMD = (*pBuf++) | (1 << 9);
}
else
{
I2Cx->IC_DATA_CMD = (*pBuf++);
}
while((I2C_CheckFlagState(I2Cx, BIT_IC_STATUS_TFE)) == 0) {
if(I2C_GetRawINT(I2Cx) & BIT_IC_RAW_INTR_STAT_TX_ABRT) {
DBG_8195A(" TX_ABRT\n");
I2C_ClearAllINT(I2Cx);
return cnt;
}
}
}
return cnt;
}
/**
* @brief Read data with special length in master mode through the I2Cx peripheral under in-house IP.
* @param I2Cx: where I2Cx can be I2C0_DEV or I2C1_DEV.
* @param pBuf: point to the buffer to hold the received data.
* @param len: the length of data that to be received.
* @param timeout_ms: specifies timeout time, unit is ms.
* @retval the length of data read.
*/
int I2C_MasterRead_TimeOut(I2C_TypeDef *I2Cx, u8* pBuf, u8 len, u32 timeout_ms)
{
int cnt = 0;
u32 InTimeoutCount = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
/* read in the DR register the data to be received */
for(cnt = 0; cnt < len; cnt++) {
InTimeoutCount = timeout_ms*500;
if(cnt >= len - 1) {
/* generate stop singal */
I2Cx->IC_DATA_CMD = 0x0003 << 8;
} else {
I2Cx->IC_DATA_CMD = 0x0001 << 8;
}
/* wait for I2C_FLAG_RFNE flag */
while((I2C_CheckFlagState(I2Cx, BIT_IC_STATUS_RFNE)) == 0) {
if(I2C_GetRawINT(I2Cx) & BIT_IC_RAW_INTR_STAT_TX_ABRT) {
DBG_8195A(" TX_ABRT\n");
I2C_ClearAllINT(I2Cx);
return cnt;
}
DelayUs(2);
if (InTimeoutCount == 0) {
DBG_8195A("MasterRead_TimeOut\n");
return cnt;
}
InTimeoutCount--;
}
*pBuf++ = (u8)I2Cx->IC_DATA_CMD;
}
return cnt;
}
/**
* @brief Write data with special length in master mode through the I2Cx peripheral under in-house IP.
* @param I2Cx: where I2Cx can be I2C0_DEV or I2C1_DEV.
* @param pBuf: point to the data to be transmitted.
* @param len: the length of data that to be received.
* @param timeout_ms: specifies timeout time, unit is ms.
* @retval the length of data send.
*/
int I2C_MasterWrite_TimeOut(I2C_TypeDef *I2Cx, u8* pBuf, u8 len, u32 timeout_ms)
{
int cnt = 0;
u32 InTimeoutCount = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
/* Write in the DR register the data to be sent */
for(cnt = 0; cnt < len; cnt++)
{
InTimeoutCount = timeout_ms*500;
while((I2C_CheckFlagState(I2Cx, BIT_IC_STATUS_TFNF)) == 0);
if(cnt >= len - 1)
{
/*generate stop signal*/
I2Cx->IC_DATA_CMD = (*pBuf++) | (1 << 9);
}
else
{
I2Cx->IC_DATA_CMD = (*pBuf++);
}
while((I2C_CheckFlagState(I2Cx, BIT_IC_STATUS_TFE)) == 0) {
if(I2C_GetRawINT(I2Cx) & BIT_IC_RAW_INTR_STAT_TX_ABRT) {
DBG_8195A(" TX_ABRT\n");
I2C_ClearAllINT(I2Cx);
return cnt;
}
DelayUs(2);
if (InTimeoutCount == 0) {
DBG_8195A("MasterWrite_TimeOut\n");
return cnt;
}
InTimeoutCount--;
}
}
return cnt;
}
/**
* @brief Master sends single byte through the I2Cx peripheral to detect slave device.
* @param obj: i2c object define in application software.
* @param address: the address of slave that to be detected.
* @param timeout_ms: specifies timeout time, unit is ms.
* @retval Slave ack condition:
* - 0: Slave available
* - -1: Slave not available
*/
int I2C_MasterSendNullData_TimeOut(I2C_TypeDef *I2Cx, int address, u32 timeout_ms)
{
u8 I2CTemp = (u8)(address<<1);
I2C_MasterSendNullData(I2Cx, &I2CTemp, 0, 1, 0);
DelayMs(timeout_ms);
if(I2C_GetRawINT(I2Cx) & BIT_IC_RAW_INTR_STAT_TX_ABRT) {
I2C_ClearAllINT(I2Cx);
/* Wait for i2c enter trap state from trap_stop state*/
DelayUs(100);
I2C_Cmd(I2Cx, DISABLE);
I2C_Cmd(I2Cx, ENABLE);
return -1;
}
return 0;
}
/**
* @brief Get i2c index according to the SDA PinName.
* @param sda: SDA PinName according to pinmux spec.
* @retval i2c index:
* - 0: I2C0 Device
* - 1: I2C1 Device
*/
static uint32_t
i2c_index_get(PinName sda)
{
if ((sda == _PA_4) || (sda == _PA_19)|| (sda == _PA_30)) {
return 0;
} else if ((sda == _PA_2) || (sda == _PA_23)|| (sda == _PA_27)) {
return 1;
} else {
assert_param(0);
}
return 2;
}
/**
* @brief Initializes the I2C device, include clock/function/I2C registers.
* @param obj: i2c object define in application software.
* @param sda: SDA PinName according to pinmux spec.
* @param scl: SCL PinName according to pinmux spec.
* @retval none
*/
void i2c_init(i2c_t *obj, PinName sda, PinName scl)
{
uint32_t i2c_idx = i2c_index_get(sda);
ConfigDebugErr &= (~(_DBG_I2C_|_DBG_GDMA_));
ConfigDebugInfo&= (~(_DBG_I2C_|_DBG_GDMA_));
DBG_8195A("i2c_idx:%x\n",i2c_idx);
obj->i2c_idx = i2c_idx;
obj->I2Cx = I2C_DEV_TABLE[i2c_idx].I2Cx;
/* Set I2C Device Number */
I2CInitDat[obj->i2c_idx].I2CIdx = i2c_idx;
/* Load I2C default value */
I2C_StructInit(&I2CInitDat[obj->i2c_idx]);
/* Assign I2C Pin Mux */
I2CInitDat[obj->i2c_idx].I2CMaster = I2C_MASTER_MODE;
I2CInitDat[obj->i2c_idx].I2CSpdMod = I2C_SS_MODE;
I2CInitDat[obj->i2c_idx].I2CClk = 100;
I2CInitDat[obj->i2c_idx].I2CAckAddr = 0;
/* Init I2C now */
if(I2CInitDat[obj->i2c_idx].I2CIdx == 0) {
//RCC_PeriphClockCmd(APBPeriph_I2C0, APBPeriph_I2C0_CLOCK, DISABLE);
RCC_PeriphClockCmd(APBPeriph_I2C0, APBPeriph_I2C0_CLOCK, ENABLE);
} else {
//RCC_PeriphClockCmd(APBPeriph_I2C1, APBPeriph_I2C1_CLOCK, DISABLE);
RCC_PeriphClockCmd(APBPeriph_I2C1, APBPeriph_I2C1_CLOCK, ENABLE);
}
/* I2C Pin Mux Initialization */
Pinmux_Config(sda, PINMUX_FUNCTION_I2C);
Pinmux_Config(scl, PINMUX_FUNCTION_I2C);
PAD_PullCtrl(sda, GPIO_PuPd_UP);
PAD_PullCtrl(scl, GPIO_PuPd_UP);
/* I2C HAL Initialization */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
/* I2C Enable Module */
I2C_Cmd(obj->I2Cx, ENABLE);
}
/**
* @brief Set i2c frequency.
* @param obj: i2c object define in application software.
* @param hz: i2c clock(unit is Hz).
* @retval none
*/
void i2c_frequency(i2c_t *obj, int hz)
{
uint16_t i2c_default_clk = (uint16_t) I2CInitDat[obj->i2c_idx].I2CClk;
uint16_t i2c_user_clk = (uint16_t) (hz/1000);
if (i2c_default_clk != i2c_user_clk) {
/* Deinit I2C first */
i2c_reset(obj);
if (i2c_user_clk <= 100) {
I2CInitDat[obj->i2c_idx].I2CSpdMod = I2C_SS_MODE;
}
else if ((i2c_user_clk > 100) && (i2c_user_clk <= 400)) {
I2CInitDat[obj->i2c_idx].I2CSpdMod = I2C_FS_MODE;
}
else if (i2c_user_clk > 400) {
I2CInitDat[obj->i2c_idx].I2CSpdMod = I2C_HS_MODE;
}
else {
I2CInitDat[obj->i2c_idx].I2CSpdMod = I2C_SS_MODE;
}
/* Load the user defined I2C clock */
I2CInitDat[obj->i2c_idx].I2CClk = i2c_user_clk;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
}
/**
* @brief Start i2c device.
* @param obj: i2c object define in application software.
* @retval 0
*/
inline int i2c_start(i2c_t *obj)
{
return 0;
}
/**
* @brief Stop i2c device.
* @param obj: i2c object define in application software.
* @retval 0
*/
inline int i2c_stop(i2c_t *obj)
{
return 0;
}
/**
* @brief I2C master read in poll mode.
* @param obj: i2c object define in application software.
* @param address: slave address which will be transmitted.
* @param data: point to the buffer to hold the received data.
* @param length: the length of data that to be received.
* @param stop: specifies whether a STOP is issued after all the bytes are received.
* @param timeout_ms: specifies timeout time, unit is ms.
* @retval the length of data received. If the retval less than the data length that want to be received, this transfer is not success.
*/
int i2c_read_timeout(i2c_t *obj, int address, char *data, int length, int stop, int timeout_ms)
{
if (i2c_target_addr[obj->i2c_idx] != address) {
/* Deinit I2C first */
i2c_reset(obj);
/* Load the user defined I2C target slave address */
i2c_target_addr[obj->i2c_idx] = address;
I2CInitDat[obj->i2c_idx].I2CAckAddr = address;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
return (I2C_MasterRead_TimeOut(obj->I2Cx, (unsigned char*)data, length,timeout_ms));
}
/**
* @brief I2C master wite in poll mode.
* @param obj: i2c object define in application software.
* @param address: slave address which will be transmitted.
* @param data: point to the buffer to hold the received data.
* @param length: the length of data that to be received.
* @param stop: specifies whether a STOP is issued after all the bytes are written.
* @param timeout_ms: specifies timeout time, unit is ms.
* @note If the length equal to zero, will call I2C_MasterSendNullData_TimeOut()
* @retval the length of data written. If the retval less than the data length that want to be sent, this transfer is not success.
*/
int i2c_write_timeout(i2c_t *obj, int address, char *data, int length, int stop, int timeout_ms)
{
if (i2c_target_addr[obj->i2c_idx] != address) {
/* Deinit I2C first */
i2c_reset(obj);
/* Load the user defined I2C target slave address */
i2c_target_addr[obj->i2c_idx] = address;
I2CInitDat[obj->i2c_idx].I2CAckAddr = address;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
if(!length) {
return (I2C_MasterSendNullData_TimeOut(obj->I2Cx, address, timeout_ms));
}
return (I2C_MasterWrite_TimeOut(obj->I2Cx, (unsigned char*)data, length,timeout_ms));
}
/**
* @brief I2C master read in poll mode.
* @param obj: i2c object define in application software.
* @param address: slave address which will be transmitted.
* @param data: point to the buffer to hold the received data.
* @param length: the length of data that to be received.
* @param stop: specifies whether a STOP is issued after all the bytes are received.
* @retval the length of data received.
*/
int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
{
u32 I2CInTOTcnt = 0;
u32 InTimeoutCount = 0;
u32 InStartCount = 0;
if (i2c_target_addr[obj->i2c_idx] != address) {
/* Deinit I2C first */
i2c_reset(obj);
/* Load the user defined I2C target slave address */
i2c_target_addr[obj->i2c_idx] = address;
I2CInitDat[obj->i2c_idx].I2CAckAddr = address;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
if (!master_addr_retry) {
I2C_MasterRead(obj->I2Cx, (unsigned char*)data, length);
} else {
while (0 == I2C_MasterRead_Patch(obj->I2Cx, (unsigned char*)data, length)) {
/* Wait for i2c enter trap state from trap_stop state*/
DelayUs(100);
/* Deinit I2C first */
i2c_reset(obj);
/* Load the user defined I2C target slave address */
i2c_target_addr[obj->i2c_idx] = address;
I2CInitDat[obj->i2c_idx].I2CAckAddr = address;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
}
return length;
}
/**
* @brief I2C master write in poll mode.
* @param obj: i2c object define in application software.
* @param address: slave address which will be transmitted.
* @param data: point to the data to be sent.
* @param length: the length of data that to be sent.
* @param stop: specifies whether a STOP is issued after all the bytes are sent.
* @retval the length of data send.
*/
int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
{
u32 I2CInTOTcnt = 0;
u32 InTimeoutCount = 0;
u32 InStartCount = 0;
if (i2c_target_addr[obj->i2c_idx] != address) {
/* Deinit I2C first */
i2c_reset(obj);
/* Load the user defined I2C target slave address */
i2c_target_addr[obj->i2c_idx] = address;
I2CInitDat[obj->i2c_idx].I2CAckAddr = address;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
if ((!restart_enable) |(1==stop)) {
return (I2C_MasterWrite_Patch(obj->I2Cx, (unsigned char*)data, length));
} else {
i2c_send_restart(obj->I2Cx, (unsigned char*)data, length, 1);
}
return length;
}
/**
* @brief I2C master send data and read data in poll mode.
* @param obj: i2c object define in application software.
* @param address: slave address which will be transmitted.
* @param pWriteBuf: point to the data to be sent.
* @param Writelen: the length of data that to be sent.
* @param pReadBuf: point to the buffer to hold the received data.
* @param Readlen: the length of data that to be received.
* @retval the length of data received.
*/
int i2c_repeatread(i2c_t *obj, int address, uint8_t *pWriteBuf, int Writelen, uint8_t *pReadBuf, int Readlen)
{
u8 cnt = 0;
if (i2c_target_addr[obj->i2c_idx] != address) {
/* Deinit I2C first */
i2c_reset(obj);
/* Load the user defined I2C target slave address */
i2c_target_addr[obj->i2c_idx] = address;
I2CInitDat[obj->i2c_idx].I2CAckAddr = address;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
/* write in the DR register the data to be sent */
for(cnt = 0; cnt < Writelen; cnt++)
{
while((I2C_CheckFlagState(obj->I2Cx, BIT_IC_STATUS_TFNF)) == 0);
if(cnt >= Writelen - 1)
{
/*generate stop signal*/
obj->I2Cx->IC_DATA_CMD = (*pWriteBuf++) | (1 << 10);
}
else
{
obj->I2Cx->IC_DATA_CMD = (*pWriteBuf++);
}
}
/*Wait I2C TX FIFO not full*/
while((I2C_CheckFlagState(obj->I2Cx, BIT_IC_STATUS_TFNF)) == 0);
I2C_MasterRead(obj->I2Cx, pReadBuf, Readlen);
return Readlen;
}
/**
* @brief I2C master restart after all bytes are sent.
* @param I2Cx: where I2Cx can be I2C0_DEV or I2C1_DEV to select the I2C peripheral.
* @param pBuf: point to the data to be sent.
* @param len: the length of data that to be sent.
* @param restart: specifies whether a RESTART is issued after all the bytes are sent.
* @retval none
*/
void i2c_send_restart(I2C_TypeDef *I2Cx, u8* pBuf, u8 len, u8 restart)
{
u8 cnt = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
/* Write in the DR register the data to be sent */
for(cnt = 0; cnt < len; cnt++)
{
while((I2C_CheckFlagState(I2Cx, BIT_IC_STATUS_TFNF)) == 0);
if(cnt >= len - 1)
{
/*generate restart signal*/
I2Cx->IC_DATA_CMD = (*pBuf++) | (restart << 10);
}
else
{
I2Cx->IC_DATA_CMD = (*pBuf++);
}
}
while((I2C_CheckFlagState(I2Cx, BIT_IC_STATUS_TFE)) == 0);
}
/**
* @brief I2C master receive single byte.
* @param obj: i2c object define in application software.
* @param last: hold the received data.
* @retval the data that received.
*/
int i2c_byte_read(i2c_t *obj, int last)
{
uint8_t i2cdatlocal;
I2C_MasterRead(obj->I2Cx, &i2cdatlocal, 1);
return (int)i2cdatlocal;
}
/**
* @brief I2C master send single byte.
* @param obj: i2c object define in application software.
* @param data: the data to be sent.
* @retval result.
*/
int i2c_byte_write(i2c_t *obj, int data)
{
uint8_t i2cdatlocal = data;
I2C_MasterWrite(obj->I2Cx, &i2cdatlocal, 1);
return 1;
}
/**
* @brief Deinitializes the I2C device
* @param obj: i2c object define in application software.
* @retval none
*/
void i2c_reset(i2c_t *obj)
{
/* Deinit I2C directly */
/* I2C HAL DeInitialization */
I2C_Cmd(obj->I2Cx, DISABLE);
}
/**
* @brief Enable i2c master RESTART function
* @param obj: i2c object define in application software.
* @retval none
*/
void i2c_restart_enable(i2c_t *obj)
{
uint32_t i2cen;
if (obj->I2Cx->IC_ENABLE & BIT_CTRL_IC_ENABLE) {
I2C_Cmd(obj->I2Cx, DISABLE);
i2cen = 1;
}
obj->I2Cx->IC_CON |= BIT_CTRL_IC_CON_IC_RESTART_EN;
if (i2cen) {
I2C_Cmd(obj->I2Cx, ENABLE);
}
restart_enable = 1;
}
/**
* @brief Disable i2c Master RESTART function
* @param obj: i2c object define in application software.
* @retval none
*/
void i2c_restart_disable(i2c_t *obj)
{
uint32_t i2cen;
if (obj->I2Cx->IC_ENABLE & BIT_CTRL_IC_ENABLE) {
I2C_Cmd(obj->I2Cx, DISABLE);
i2cen = 1;
}
obj->I2Cx->IC_CON &= ~BIT_CTRL_IC_CON_IC_RESTART_EN;
if (i2cen) {
I2C_Cmd(obj->I2Cx, ENABLE);
}
restart_enable = 0;
}
/**
* @brief Enable/Disable i2c Device
* @param obj: i2c object define in application software.
* @param enable: this parameter can be one of the following values:
* @arg 0 disable
* @arg 1 enable
* @retval result
*/
int i2c_enable_control(i2c_t *obj, int enable)
{
if (enable) {
I2C_Cmd(obj->I2Cx, ENABLE);
} else {
I2C_Cmd(obj->I2Cx, DISABLE);
}
return 0;
}
//#if DEVICE_I2CSLAVE
/**
* @brief Set i2c slave address.
* @param obj: i2c object define in application software.
* @param idx: i2c index, this parameter can be one of the following values:
* @arg 0 I2C0 Device
* @arg 1 I2C1 Device
* @param address: slave address.
* @param mask: the mask of address
* @retval none
*/
void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
{
uint16_t i2c_default_addr = (uint16_t) I2CInitDat[obj->i2c_idx].I2CAckAddr;
uint16_t i2c_user_addr = (uint16_t) address;
if (i2c_default_addr != i2c_user_addr) {
/* Deinit I2C first */
i2c_reset(obj);
/* Load the user defined I2C clock */
I2CInitDat[obj->i2c_idx].I2CAckAddr = i2c_user_addr;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
}
/**
* @brief Set i2c device to be slave.
* @param obj: i2c object define in application software.
* @param enable_slave: enable slave function, this parameter can be one of the following values:
* @arg 0 disable
* @arg 1 enable
* @retval none
*/
void i2c_slave_mode(i2c_t *obj, int enable_slave)
{
/* Deinit I2C first */
i2c_reset(obj);
/* Load the user defined I2C clock */
I2CInitDat[obj->i2c_idx].I2CMaster = I2C_MASTER_MODE;
if (enable_slave)
I2CInitDat[obj->i2c_idx].I2CMaster = I2C_SLAVE_MODE;
/* Init I2C now */
I2C_Init(obj->I2Cx, &I2CInitDat[obj->i2c_idx]);
I2C_Cmd(obj->I2Cx, ENABLE);
}
/**
* @brief Get i2c slave state.
* @param obj: i2c object define in application software.
* @retval the state of i2c slave.
*/
int i2c_slave_receive(i2c_t *obj)
{
u32 I2CLocalTemp = I2C_GetRawINT(obj->I2Cx);
if (I2CLocalTemp & BIT_IC_RAW_INTR_STAT_GEN_CALL) {
return WriteGeneral;
}
else if (I2CLocalTemp & BIT_IC_RAW_INTR_STAT_RD_REQ) {
return ReadAddressed;
}
if (I2C_CheckFlagState(obj->I2Cx, BIT_IC_STATUS_RFNE)) {
return WriteAddressed;
}
return 0;
}
/**
* @brief I2C slave read in poll mode.
* @param obj: i2c object define in application software.
* @param data: point to the buffer to hold the received data.
* @param length: the length of data that to be received.
* @retval the length of data received.
*/
int i2c_slave_read(i2c_t *obj, char *data, int length)
{
I2C_SlaveRead(obj->I2Cx, (unsigned char*)data, length);
return length;
}
/**
* @brief I2C slave write in poll mode.
* @param obj: i2c object define in application software.
* @param data: point to the data to be sent.
* @param length: the length of data that to be sent.
* @retval result.
*/
int i2c_slave_write(i2c_t *obj, const char *data, int length)
{
I2C_SlaveWrite(obj->I2Cx, (unsigned char*)data, length);
return 1;
}
/**
* @brief Set/clear i2c slave RD_REQ interrupt mask.
* @param obj: i2c object define in application software.
* @param set: set or clear for read request.
* @retval result.
*/
int i2c_slave_set_for_rd_req(i2c_t *obj, int set)
{
if (set) {
I2C_INTConfig(obj->I2Cx, BIT_IC_INTR_MASK_M_RD_REQ, ENABLE);
} else {
I2C_INTConfig(obj->I2Cx, BIT_IC_INTR_MASK_M_RD_REQ, DISABLE);
}
return _TRUE;
}
/**
* @brief Set/clear i2c slave NAK or ACK data part in transfer.
* @param obj: i2c object define in application software.
* @param set_nak: set or clear for data NAK.
* @retval result.
*/
int i2c_slave_set_for_data_nak(i2c_t *obj, int set_nak)
{
I2C_TypeDef * I2Cx = obj->I2Cx;
u32 temp;
while (1) {
temp = I2Cx->IC_STATUS;
if ((BIT_IC_STATUS_SLV_ACTIVITY & temp) == 0) {
break;
}
}
I2Cx->IC_SLV_DATA_NACK_ONLY = set_nak;
return 0;
}
//#endif // CONFIG_I2C_SLAVE_EN
/******************* (C) COPYRIGHT 2016 Realtek Semiconductor *****END OF FILE****/
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