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s51_i2c.c
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s51_i2c.c
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/**
* @file s51_i2c.c
* @author bnsycmc([email protected])
* @brief s51 soft i2c data transfer overview
* @version 0.1
* @date 2022-05-25
*
* @copyright Copyright (c) 2022
*
*/
#include "s51_i2c.h"
#include "stdio.h"
/**
* @brief s51 soft i2c statr
*
* @param _i2c
*/
static void s51_i2c_Start(s51_i2c_struct *_i2c)
{
_i2c->pin_mode(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_MODE_WRITE);
_i2c->pin_mode(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_MODE_WRITE);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_LOW);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
}
/**
* @brief s51 soft i2c stop
*
* @param _i2c
*/
static void s51_i2c_Stop(s51_i2c_struct *_i2c)
{
_i2c->pin_mode(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_MODE_WRITE);
_i2c->pin_mode(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_MODE_WRITE);
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_LOW);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_HIGH);
}
/**
* @brief s51 soft i2c wair ack signal
*
* @param _i2c
* @return uint8_t 0:failed 1:success
*/
static uint8_t s51_i2c_WaitAck(s51_i2c_struct *_i2c)
{
uint16_t timeCount;
_i2c->pin_mode(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_MODE_READ);
for (timeCount = 0; timeCount < _i2c->ackWaitClk; timeCount++)
{
if (_i2c->pin_read(S51_I2C_PIN_NAME_SDA) == S51_I2C_PIN_STATE_LOW)
{
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
return S51_I2C_PIN_STATE_LOW;
}
}
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
return S51_I2C_PIN_STATE_HIGH;
}
static void s51_i2c_Ack(s51_i2c_struct *_i2c)
{
_i2c->pin_mode(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_MODE_WRITE);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_LOW);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
}
static void s51_i2c_NoAck(s51_i2c_struct *_i2c)
{
_i2c->pin_mode(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_MODE_WRITE);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
}
static void s51_i2c_WriteByte(s51_i2c_struct *_i2c, uint8_t _byte)
{
uint8_t i;
uint8_t dataCache;
_i2c->pin_mode(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_MODE_WRITE);
dataCache = _byte;
for (i = 0; i < 8; i++)
{
if (dataCache & 0x80)
{
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_HIGH);
}
else
{
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_LOW);
}
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_HIGH);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
dataCache = dataCache << 1;
}
_i2c->pin_write(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_STATE_HIGH); // the last bit set sda high and wait ack
}
static uint8_t s51_i2c_ReadByte(s51_i2c_struct *_i2c)
{
uint8_t i;
uint8_t dataCache;
_i2c->pin_mode(S51_I2C_PIN_NAME_SDA, S51_I2C_PIN_MODE_READ);
dataCache = 0;
for (i = 0; i < 8; i++)
{
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_HIGH);
dataCache = dataCache << 1;
if (_i2c->pin_read(S51_I2C_PIN_NAME_SDA) == S51_I2C_PIN_STATE_HIGH)
{
dataCache = dataCache | 0x01;
}
}
_i2c->pin_write(S51_I2C_PIN_NAME_SCL, S51_I2C_PIN_STATE_LOW);
return dataCache;
}
/**
* @brief transmit i2c data
*
* @param _i2c handle
* @param address drive address
* @param _data transmit buff
* @param len transmit data len
* @return uint8_t 0:falid 1:success
*/
uint8_t s51_i2c_TransmitDataAddress(s51_i2c_struct *_i2c, uint8_t address, uint8_t *_data, uint16_t len)
{
uint16_t i;
s51_i2c_Start(_i2c);
s51_i2c_WriteByte(_i2c, address);
if (s51_i2c_WaitAck(_i2c) == S51_I2C_PIN_STATE_HIGH)
{
return 0; // faild
}
for (i = 0; i < len; i++)
{
s51_i2c_WriteByte(_i2c, *_data++);
if (s51_i2c_WaitAck(_i2c) == S51_I2C_PIN_STATE_HIGH)
{
return 0; // faild
}
}
s51_i2c_Stop(_i2c);
return 1; // success
}
/**
* @brief receive i2c data
*
* @param _i2c handle
* @param address drive address
* @param _data read buff
* @param len read len
* @return uint8_t 0:faild,1:success
*/
uint8_t s51_i2c_ReceiveDataAddress(s51_i2c_struct *_i2c, uint8_t address, uint8_t *_data, uint16_t len)
{
uint16_t i;
s51_i2c_Start(_i2c);
s51_i2c_WriteByte(_i2c, address);
if (s51_i2c_WaitAck(_i2c) == S51_I2C_PIN_STATE_HIGH)
{
return 0; // faild
}
for (i = 0; i < len; i++)
{
*_data++ = s51_i2c_ReadByte(_i2c);
if (i >= len)
{
s51_i2c_NoAck(_i2c);
}
else
{
s51_i2c_Ack(_i2c);
}
}
s51_i2c_Stop(_i2c);
return 1; // success
}
/**
* @brief s51 soft i2c send data then read data without stop
*
* @param _i2c handle
* @param address drive address
* @param _Txdata send data buff
* @param Txlen send data len
* @param _Rxdata read data buff
* @param Rxlen read data len
* @return uint8_t 0:faild,1:success
*/
uint8_t s51_i2c_TransmitReceiveDataAddress(s51_i2c_struct *_i2c, uint8_t address, uint8_t *_Txdata, uint16_t Txlen, uint8_t *_Rxdata, uint16_t Rxlen)
{
uint16_t i;
s51_i2c_Start(_i2c);
s51_i2c_WriteByte(_i2c, address);
if (s51_i2c_WaitAck(_i2c) == S51_I2C_PIN_STATE_HIGH)
{
return 0; // faild
}
for (i = 0; i < Txlen; i++)
{
s51_i2c_WriteByte(_i2c, *_Txdata++);
if (s51_i2c_WaitAck(_i2c) == S51_I2C_PIN_STATE_HIGH)
{
return 0; // faild
}
}
s51_i2c_Start(_i2c);
s51_i2c_WriteByte(_i2c, address + 1);
if (s51_i2c_WaitAck(_i2c) == S51_I2C_PIN_STATE_HIGH)
{
return 0; // faild
}
for (i = 0; i < Rxlen; i++)
{
*_Rxdata++ = s51_i2c_ReadByte(_i2c);
if (i >= Rxlen - 1)
{
s51_i2c_NoAck(_i2c);
}
else
{
s51_i2c_Ack(_i2c);
}
}
s51_i2c_Stop(_i2c);
return 1; // success
}