//-----------------------------------------------------------------------------
// F99x_SMBus_Master.c
// C:\SiliconLabs\SimplicityStudio\v2_3\workspace\F99x-98x_SMBus_Master_2\Debug\F99x-98x_SMBus_Master_2.hex
//-----------------------------------------------------------------------------
// Example software to demonstrate the SMBus interface in
//遇到下列错误，重新启动电脑，OK
//m.AllocationBase 0x0, m.BaseAddress 0x71110000, m.RegionSize 0x480000, m.State 0x10000
//C:\SiliconLabs\SimplicityStudio\v2_3\developer\msys\1.0\bin\sh.exe: *** Couldn't reserve space for cygwin's heap (0x71110000 <0x2200000>) in child, Win32 error 0
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include "common.h"
#include "I2C.h"
#include <ioCC2541.h>
/* ------------------------------------------------------------------------------------------------
* Constants
* ------------------------------------------------------------------------------------------------
*/
// I2CWC
#define I2C_OVR BV(7) // 1: GPIO functionality.0: I2C functionality
#define I2C_SCLPUE BV(3) //SCL pin pullup enable
#define I2C_SDAPUE BV(2) //SDA pin pullup enable.
#define I2C_SCLOE BV(1) //SCL pin output enable
#define I2C_SDAOE BV(0) //SDA pin output enable
// I2CIO
#define I2C_SCLD BV(1) //SCL data value
#define I2C_SDAD BV(0) //SDA data value
#define SDA_0 I2CIO &= ~I2C_SDAD //SDA=0
#define SDA_1 I2CIO |= I2C_SDAD //SDA=1
#define SCL_0 I2CIO &= ~I2C_SCLD //SCL=0
#define SCL_1 I2CIO |= I2C_SCLD //SCL=1
#define SDA_IN I2CWC &= ~I2C_SDAOE //SDA INPUT
#define SDA_OUT I2CWC |= I2C_SDAOE //SDA OUTPUT
#define SCL_IN I2CWC &= ~I2C_SCLOE //SCL INPUT
#define SCL_OUT I2CWC |= I2C_SCLOE //SCL OUTPUT
#define I2C_GPIO I2CWC = 0x80; //1: I2C GPIO
//***********************************************************************************
//*名称：i2c_send_noack() *
//*功能：无应答I2C总线 *
//*参数：无 *
//*返回：1 有NOACK信号 0 无NOACK信号 *
//***********************************************************************************
void send_noack(){
SDA_OUT; //开路输出,
SDA_1; //SDA = 1; NO ACK
asm("nop");
SCL_1; //SCL = 1;
asm("nop");
SCL_0; //SCL = 0; //START
}
// iic 应答 for slaver
void send_ack() {
SDA_OUT; //开路输出,
SDA_0; //OUT 0 ACK
asm("nop");
SCL_1;
asm("nop");
SCL_0;
}
/*
*停止iic
*/
static void stop(){
SDA_OUT; //开路输出,并输出0.
SCL_0; //SCL = 0;
asm("nop");
SCL_1; //SCL = 1; STOP
asm("nop");
SDA_1; //SDA = 1;
SDA_IN;
SCL_IN;
}
/*
* 启动iic
*/
// static void start() {
static void start(){
SDA_OUT; //开路输出,并输出0.
SCL_OUT;
SDA_1; //SDA = 1;
SCL_1; //SCL = 1;
asm("nop");
SDA_0; //SDA = 0;
asm("nop");
SCL_0; //SCL = 0; //START
}
/*
* iic写一个字节
*/
void iic_write(uint8 datIn) {
uint8 dat, j;
dat = datIn;
SDA_OUT;
for (j = 0; j < 8; j++) {
if((dat & 0x80)) SDA_1;
else SDA_0;
asm("nop"); asm("nop"); asm("nop");
SCL_1; //write TDOS_SDA begin
asm("nop");
dat <<= 1;
SCL_0; //write TDOS_SDA end
}
}
bool check_ack() {
bool ack_flag;
SDA_IN; //开路输入,
asm("nop");
SCL_1; //read ask begin
asm("nop");
if((I2CIO & I2C_SDAD) ==1){ //if (SDA==1)
ack_flag = 0; //1: err
}else{
ack_flag = 1; //0: ok
}
SCL_0; //read ask end
return ack_flag;
}
/*
* iic读一个字节
*/
uint8 iic_read() {
uint8 j, dat = 0;
SDA_IN; //开路输入,
for (j = 0; j < 8; j++) {
SCL_1; //read TDOS_SDA begin. delay 0.7us
dat <<= 1;
asm("nop"); asm("nop"); asm("nop");
if((I2CIO & I2C_SDAD) ==1){ //if (SDA==1)
dat |= 0x01; //input TDOS_SDA
}
SCL_0; //read TDOS_SDA end. delay 1.4us
}
return dat;
}
/*
* 通过I2C总线向某一寄存器写入一个字节数据
*/
void I2C_write_byte(uint8 I2C_addr, uint8 Raddr, uint8 dat) {
start(); //发启动信号
iic_write(I2C_addr | 0X00); //WRITE i2c
if (check_ack()==0) {
goto err;
}
iic_write(Raddr); //发送寄存器地址
if (check_ack()==0) {
goto err;
}
iic_write(dat); //发送数据字节
if (check_ack()==0) {
goto err;
}
err:
stop();
}
/*
* 通过I2C总线读出某一寄存器的数据
*/
uint8 I2C_read_byte(uint8 I2C_addr, uint8 Raddr) {
uint8 dat;
start();
iic_write(I2C_addr | 0X00); //WRITE i2c
if (check_ack()==0) {
goto err;
}
iic_write(Raddr); //TDOS'register
if (check_ack()==0) {
goto err;
}
start(); //重发起动信号
iic_write(I2C_addr | 0X01); //READ
if (check_ack()==0) {
goto err;
}
dat = iic_read(); //接收读出的数据
send_noack();
err:
stop();
return dat;
}
/*
* 通过I2C总线读出某一寄存器的数据
*/
uint32 I2C_read_3byte(uint8 I2C_addr, uint8 Raddr) {
uint8 dat1,dat2,dat3;
start();
iic_write(0X98 | 0X00); //WRITE i2c
if (check_ack()==0) {
goto err;
}
iic_write(0X00); //TDOS'register
if (check_ack()==0) {
goto err;
}
start(); //重发起动信号
iic_write(0X98 | 0X01); //READ
if (check_ack()==0) {
goto err;
}
dat1 = iic_read(); //接收读出的数据
send_ack();
dat2 = iic_read(); //接收读出的数据
send_ack();
dat3 = iic_read(); //接收读出的数据
send_noack();
err:
stop();
return (dat1<<16) | (dat2<<8) | dat3;
}
//-----------------------------------------------------------------------------
// End Of File
//-----------------------------------------------------------------------------
