//configure I2C
void BMP180_init(void) {
P8OUT |= BIT4; //set SW_I2C high to power on all I2C chips
__delay_cycles(24000000); //wait 1s (assuming 24MHz MCLK) to allow for power ramp up
I2C_Master_Init(S_MCLK,24000000,400000); //Source from SMCLK, which is running @ 24MHz. 4kHz desired BRCLK
//max is 3.4MHz
}
void I2CMaster_TX(I2C_TypeDef *I2Cx)
{
unsigned int tempClear = 0x0;
unsigned int i;
I2C_Master_Init(I2Cx);
for(i=0;i<10;i++)
{
I2Cx->IC_DATA_CMD = 0x00aa + i;
//I2C->IC_DATA_CMD = 0xaa;
while(1)
{
if((I2Cx->IC_RAW_INTR_STAT & 0x0010)==0x0010)//tx_empty=1
break;
}
//uart_printf("tx 0k\r\n");
}
while(1)
{
if((I2Cx->IC_STATUS & 0x20)==0x20)//MST-ACTIVITY=0 check idle
break;
}
while(1)
{
if((I2Cx->IC_RAW_INTR_STAT & 0x0200)==0x0200)//stop flag detect
tempClear = I2Cx->IC_CLR_STOP_DET; //read this reg clear stop flag
break;
}
}
/* I2C Slave with Interrupt Init */
void I2C_SlaveWithInterrupt_Init(I2C_TypeDef* I2Cx, uint32_t freq, int SlaveAddr, pin_t scl, pin_t sda){
NVIC_InitTypeDef i2c_slave_nvic;
uint8_t _i2c_er_irq;
I2C_Master_Init(I2Cx, freq, scl, sda);
I2C_Slave_Mode(I2Cx, 1);
I2C_Slave_Address(I2Cx, SlaveAddr);
/* Configure the Priority Group to 1 bit */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
if(I2Cx == I2C1){
_i2c_er_irq = I2C1_ER_IRQn;
i2c_slave_nvic.NVIC_IRQChannel = I2C1_EV_IRQn;
}else if(I2Cx == I2C2){
_i2c_er_irq = I2C2_ER_IRQn;
i2c_slave_nvic.NVIC_IRQChannel = I2C2_EV_IRQn;
}
i2c_slave_nvic.NVIC_IRQChannelPreemptionPriority = 1;
i2c_slave_nvic.NVIC_IRQChannelSubPriority = 0;
i2c_slave_nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&i2c_slave_nvic);
i2c_slave_nvic.NVIC_IRQChannel = _i2c_er_irq;
NVIC_Init(&i2c_slave_nvic);
/* Enable Error Interrupt */
I2C_ITConfig(I2Cx, (I2C_IT_ERR | I2C_IT_EVT | I2C_IT_BUF), ENABLE);
}
void I2CMaster_RX(I2C_TypeDef *I2Cx)
{
unsigned int tempClear = 0x0;
unsigned int i;
unsigned int rxdata[10] = {0x0};
I2C_Master_Init(I2Cx);
for(i=0;i<10;i++)
{
I2Cx->IC_DATA_CMD = 0x100;
while(1)
{
if((I2Cx->IC_RAW_INTR_STAT & 0x0004)==0x0004)
break;
}
rxdata[i] = I2Cx->IC_DATA_CMD;
uart_printf("rxdata%d = 0x%x\r\n",i,rxdata[i]);
}
}
void Main()
{
Setup();
I2C_Master_Init();
I2C1_Init(100000);
while(1){
I2C1_Start();
I2C1_Wr(8 << 1);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(100);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Stop();
Delay_ms(500);
I2C1_Start();
I2C1_Wr(8 << 1);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Wr(0);
I2C1_Stop();
Delay_ms(500);
}
}
/* I2C Slave Init */
void I2C_Slave_Init(I2C_TypeDef* I2Cx, uint32_t freq, int SlaveAddr, pin_t scl, pin_t sda){
I2C_Master_Init(I2Cx, freq, scl, sda);
I2C_Slave_Mode(I2Cx, 1);
I2C_Slave_Address(I2Cx, SlaveAddr);
}