修复之前写的模拟I2C程序，增加多总线，时序更精确操作
C文件：
-------------------------------------------------------------------------------------
#include"Si2c.h"
//Bus driver implementation
Si2c_device Si2c_device_nu[MY_SI2C_DEVICE_NU];
enum Si2c_err MY_Si2c_err;
void Si2c_delay( unsigned int dy ) {
unsigned int i = 0;
for( i = 0; i < dy; i++ )
;
}
//
void My_Si2c_GPIO_init( void ) {
rcu_periph_clock_enable( RCU_GPIOB );
gpio_init( GPIOB, GPIO_MODE_OUT_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_12 ); //scl
gpio_init( GPIOB, GPIO_MODE_OUT_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_13 ); //sda
gpio_bit_write( GPIOB, GPIO_PIN_13, SET );
gpio_bit_write( GPIOB, GPIO_PIN_12, SET );
Si2c_delay( MY_SI2C_DELAY );
Si2c_delay( MY_SI2C_DELAY );
}
//
//1
void My_Si2c_SDA_set( void ) {
gpio_bit_write( GPIOB, GPIO_PIN_13, SET );
}
//
//0
void My_Si2c_SDA_reset( void ) {
gpio_bit_write( GPIOB, GPIO_PIN_13, RESET );
}
//
//1
void My_Si2c_SCL_set( void ) {
gpio_bit_write( GPIOB, GPIO_PIN_12, SET );
}
//
//0
void My_Si2c_SCL_reset( void ) {
gpio_bit_write( GPIOB, GPIO_PIN_12, RESET );
}
//if STM32
//In open drain mode, read access to the input data register yields I/O status
//if LPCxxx
//The software can read the state of all GPIO pins except those selected as analog input or output in the I/O configuration logic
//Outside. To read the state of a pin, it is not necessary to select GPIO in the I/O configuration.
//if STC of 51
//Open-drain, internal pull-up resistance is disconnected
//Open leakage mode can read the external state and output (high level or low current)
//Flat). If you want to read the external state correctly or need to output high level, you need external
//Add pull resistance, otherwise can not read the external state, also can not output high level.
unsigned char My_Si2c_SCL_read( void ) {
return gpio_input_bit_get( GPIOB, GPIO_PIN_12 );
}
unsigned char My_Si2c_SDA_read( void ) {
return gpio_input_bit_get( GPIOB, GPIO_PIN_13 );
}
//Check the reply
unsigned char MY_Si2c_check_reply( unsigned char nu ) {
//SCL ____---____
//SDA ????ACK????
unsigned char tmp;
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SDA_set();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY / 2 );
if( 0 == Si2c_device_nu[nu].Si2c_SDA_read() ) {
tmp = S_OK;
} else {
tmp = bus_noack;
}
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_reset();
return tmp;
}
//Start signal
unsigned char MY_Si2c_start( unsigned char nu ) {
//SCL --------------------------_________
//SDA --------------------_______________
if( 1 == Si2c_device_nu[nu].Si2c_SCL_read() && 1 == Si2c_device_nu[nu].Si2c_SDA_read() ) {
Si2c_device_nu[nu].Si2c_SDA_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
} else {
return bus_err;
}
return S_OK;
}
//Send reply signal
void MY_Si2c_send_ack( unsigned char nu ) {
//SCL ____
//SDA ----
Si2c_device_nu[nu].Si2c_SDA_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY );
Si2c_device_nu[nu].Si2c_SCL_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SDA_set();
//SCL ____
//SDA ----
}
void MY_Si2c_stop( unsigned char nu ) {
//SCL ______-----------------
//SDA ???______________------
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SDA_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SDA_set();
Si2c_delay( MY_SI2C_DELAY );
//SCL --------
//SDA --------
}
void MY_Si2c_send_nack( unsigned char nu ) {
//SCL ____
//SDA ----
Si2c_device_nu[nu].Si2c_SDA_set();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY );
Si2c_device_nu[nu].Si2c_SCL_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
}
unsigned char MY_Si2c_addressing( unsigned char nu, unsigned char addr,
unsigned char rw ) {
//SCL __---___---
//SDA C-----C-------
unsigned char i = 0;
unsigned char tmp = ( addr << 1 ) | rw;
for( i = 0; i < 8; i++ ) {
if( tmp & 0x80 ) {
Si2c_device_nu[nu].Si2c_SDA_set();
} else {
Si2c_device_nu[nu].Si2c_SDA_reset();
}
tmp <<= 1;
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_reset();
}
//SCL ____
//SDA ????
if( S_OK == MY_Si2c_check_reply( nu ) ) {
return S_OK;
} else {
return bus_noack;
}
//SCL ____
//SDA ????
}
void MY_Si2c_send_char( unsigned char nu, unsigned char tmp ) {
unsigned char i = 0;
for( i = 0; i < 8; i++ ) {
if( tmp & 0x80 ) {
Si2c_device_nu[nu].Si2c_SDA_set();
} else {
Si2c_device_nu[nu].Si2c_SDA_reset();
}
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY );
Si2c_device_nu[nu].Si2c_SCL_reset();
if( i == 7 ) {
Si2c_device_nu[nu].Si2c_SDA_set();
}
tmp <<= 1;
}
}
void MY_Si2c_read_char( unsigned char nu, unsigned char* data ) {
//SCL ____
//SDA ????
unsigned char i = 0;
Si2c_delay( MY_SI2C_DELAY / 2 );
for( i = 0; i < 8; i++ ) {
*data <<= 1;
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY / 2 );
if( 1 == Si2c_device_nu[nu].Si2c_SDA_read() ) {
( *data ) |= 1;
}
Si2c_device_nu[nu].Si2c_SCL_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
}
}
unsigned char MY_Si2c_Multibyte_sending( unsigned char nu, unsigned char addr,
unsigned char* buffer, unsigned char len ) {
unsigned char i = 0;
MY_Si2c_start( nu );
if( S_OK == MY_Si2c_addressing( nu, addr, MY_SI2C_WRITE ) ) {
//SCL ____
//SDA ????
for( i = 0; i < len; i++ ) {
MY_Si2c_send_char( nu, buffer[i] );
if( S_OK != MY_Si2c_check_reply( nu ) ) {
Si2c_device_nu[nu].Si2c_SCL_set();
return bus_noack;
}
}
} else {
Si2c_device_nu[nu].Si2c_SCL_set();
return bus_noack;
}
MY_Si2c_stop( nu );
return S_OK;
}
unsigned char MY_Si2c_Multibyte_reading( unsigned char nu, unsigned char addr,
unsigned char* buffer, unsigned char len ) {
unsigned char i = 0;
MY_Si2c_start( nu );
if( S_OK == MY_Si2c_addressing( nu, addr, MY_SI2C_READ ) ) {
//SCL ____
//SDA ????
for( i = 0; i < len; i++ ) {
MY_Si2c_read_char( nu, &buffer[i] );
//SCL ____
//SDA ????
if( i == ( len - 1 ) )
MY_Si2c_send_nack( nu );
else
MY_Si2c_send_ack( nu );
//SCL ____
//SDA ----
}
} else {
return bus_noack;
}
MY_Si2c_stop( nu );
return S_OK;
}
unsigned char MY_Si2c_writeandread( unsigned char nu, unsigned char addr, unsigned char* mregister,
unsigned char rsize, unsigned char* buff, unsigned char bsize ) {
unsigned char i = 0;
MY_Si2c_start( nu );
if( S_OK == MY_Si2c_addressing( nu, addr, MY_SI2C_WRITE ) ) {
//SCL ____
//SDA ????
for( i = 0; i < rsize; i++ ) {
MY_Si2c_send_char( nu, mregister[i] );
if( S_OK != MY_Si2c_check_reply( nu ) ) {
return bus_noack;
}
}
//SCL ____
//SDA ----
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SDA_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
Si2c_device_nu[nu].Si2c_SCL_reset();
Si2c_delay( MY_SI2C_DELAY / 2 );
if( S_OK != MY_Si2c_addressing( nu, addr, MY_SI2C_READ ) )
return bus_noack;
for( i = 0; i < bsize; i++ ) {
MY_Si2c_read_char( nu, &buff[i] );
if( i == ( bsize - 1 ) )
MY_Si2c_send_nack( nu );
else
MY_Si2c_send_ack( nu );
}
} else {
return bus_noack;
}
MY_Si2c_stop( nu );
return S_OK;
}
void MY_Si2c_unlockbus( unsigned char nu ) {
unsigned char i = 0;
Si2c_device_nu[nu].Si2c_SDA_set();
Si2c_delay( MY_SI2C_DELAY * 2 );
for( i = 0; i < 9; i++ ) {
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY * 2 );
Si2c_device_nu[nu].Si2c_SCL_reset();
Si2c_delay( MY_SI2C_DELAY * 2 );
}
Si2c_device_nu[nu].Si2c_SCL_set();
Si2c_delay( MY_SI2C_DELAY * 4 );
}
void My_Si2c_Querying_secondary_Devices( unsigned char nu, unsigned char* myaddrs ) {
//7F
unsigned char i = 0;
unsigned char tmp = 0;
unsigned char j = 0;
for( i = 0; i < ( 0x7F + 1 ); i++ ) {
MY_Si2c_start( nu );
tmp = MY_Si2c_addressing( nu, i, MY_SI2C_READ );
MY_Si2c_stop( nu );
if( S_OK == tmp ) {
myaddrs[j++] = i;
}
Si2c_delay( MY_SI2C_DELAY );
}
}
void Si2c_initial( void ) {
Si2c_device_nu[0].Si2c_GPIO_init = My_Si2c_GPIO_init;
Si2c_device_nu[0].Si2c_SDA_set = My_Si2c_SDA_set;
Si2c_device_nu[0].Si2c_SDA_reset = My_Si2c_SDA_reset;
Si2c_device_nu[0].Si2c_SDA_read = My_Si2c_SDA_read;
Si2c_device_nu[0].Si2c_SCL_set = My_Si2c_SCL_set;
Si2c_device_nu[0].Si2c_SCL_reset = My_Si2c_SCL_reset;
Si2c_device_nu[0].Si2c_SCL_read = My_Si2c_SCL_read;
Si2c_device_nu[0].Si2c_GPIO_init();
}
H文件
----------------------------------------------------------------------------------
#ifndef __MY_SI2C__
#define __MY_SI2C__
#include "gd32f30x_gpio.h"
#include "gd32f30x_rcu.h"
#define MY_SI2C_DEVICE_NU 2 //The bus number
#define MY_SI2C_READ 1
#define MY_SI2C_WRITE 0
#define MY_SI2C_ADDR1 (0x68) //Device address
#define MY_SI2C_DELAY 150 //The bus delay
#define Si2c_LOG
//Bus error type
enum Si2c_err {
S_OK = 0,
bus_err,
bus_busy,
bus_noack,
};
extern enum Si2c_err MY_Si2c_err;
//Bus driver implementation
typedef struct {
void ( *Si2c_GPIO_init )( void );
void ( *Si2c_SDA_set )( void );
void ( *Si2c_SDA_reset )( void );
void ( *Si2c_SCL_set )( void );
void ( *Si2c_SCL_reset )( void );
unsigned char ( *Si2c_SCL_read )( void );
unsigned char ( *Si2c_SDA_read )( void );
} Si2c_device;
//Bus driver implementation
extern Si2c_device Si2c_device_nu[MY_SI2C_DEVICE_NU];
void Si2c_delay( unsigned int dy );
void My_Si2c_GPIO_init( void );
void My_Si2c_SDA_set( void );
void My_Si2c_SDA_reset( void );
void My_Si2c_SCL_set( void );
void My_Si2c_SCL_reset( void );
unsigned char My_Si2c_SCL_read( void );
unsigned char My_Si2c_SDA_read( void );
//Check the reply
unsigned char MY_Si2c_check_reply( unsigned char nu );
//Start signal
unsigned char MY_Si2c_start( unsigned char nu );
//Send reply signal
void MY_Si2c_send_ack( unsigned char nu );
void MY_Si2c_stop( unsigned char nu );
void MY_Si2c_send_nack( unsigned char nu );
unsigned char MY_Si2c_addressing( unsigned char nu, unsigned char addr, unsigned char rw );
void MY_Si2c_send_char( unsigned char nu, unsigned char tmp );
void MY_Si2c_read_char( unsigned char nu, unsigned char* data );
unsigned char MY_Si2c_Multibyte_sending( unsigned char nu, unsigned char addr, unsigned char* buffer, unsigned char len );
unsigned char MY_Si2c_Multibyte_reading( unsigned char nu, unsigned char addr, unsigned char* buffer, unsigned char len );
unsigned char MY_Si2c_writeandread( unsigned char nu, unsigned char addr, unsigned char* mregister, unsigned char rsize, unsigned char* buff, unsigned char bsize );
void My_Si2c_Querying_secondary_Devices( unsigned char nu, unsigned char* myaddrs );
void Si2c_initial( void );
void MY_Si2c_unlockbus( unsigned char nu );
#endif
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