// Public Methods //////////////////////////////////////////////////////////////
void TwoWire::begin(uint8_t address)
{
rxBufferIndex = 0;
rxBufferLength = 0;
txBufferIndex = 0;
txBufferLength = 0;
slaveBufferIndex = 0;
slaveBufferLength = 0;
transmitting_master = false;
transmitting_slave = false;
receiving_slave = false;
SIM_HAL_EnableClock(SIM, gate_name);
PORT_CLOCK_ENABLE(sda);
PORT_CLOCK_ENABLE(scl);
PORT_BWR_PCR_ODE(PERIPH_PORT(sda), PINS_PIN(sda), true); //set as open drain
PORT_BWR_PCR_ODE(PERIPH_PORT(scl), PINS_PIN(scl), true); //set as open drain
PORT_SET_MUX_I2C(sda);
PORT_SET_MUX_I2C(scl);
I2C_HAL_Init(instance);
I2C_HAL_SetAddress7bit(instance, address);
I2C_HAL_SetStartStopIntCmd(instance, true);
I2C_HAL_SetIntCmd(instance, true);
NVIC_EnableIRQ(irqNumber);
I2C_HAL_Enable(instance);
setClock(100000);
}
/* This function is called for configuring pinmux for i2c module
* This function only support switching default or gpio or fixed-ALTx mode on fixed pins
* (Although there are many ALTx-pinmux configuration choices on various pins for the same
* peripheral module) */
void i2c_pinmux_config(unsigned int instance, pinmux_type_t pinmux)
{
switch(instance)
{
case 0:
break;
#if BL_CONFIG_I2C
case 1:
switch(pinmux)
{
case kPinmuxType_Default:
PORT_BWR_PCR_MUX(PORTC, 10, 0);
PORT_BWR_PCR_MUX(PORTC, 11, 0);
PORT_BWR_PCR_ODE(PORTC, 10, 0);
PORT_BWR_PCR_ODE(PORTC, 11, 0);
break;
case kPinmuxType_Peripheral:
// Enable pins for I2C1.
PORT_BWR_PCR_MUX(PORTC, 10, 2); // I2C1_SCL is ALT2 for pin PTC10
PORT_BWR_PCR_ODE(PORTC, 10, 1); // I2C1_SCL set for open drain
PORT_BWR_PCR_MUX(PORTC, 11, 2); // I2C1_SDA is ALT2 for pin PTC11
PORT_BWR_PCR_ODE(PORTC, 11, 1); // I2C1_SDA set for open drain
break;
default:
break;
}
break;
#endif // BL_CONFIG_I2C
case 2:
break;
default:
break;
}
}
/* This function is called for configuring pinmux for i2c module
* This function only support switching default or gpio or fixed-ALTx mode on fixed pins
* (Although there are many ALTx-pinmux configuration choices on various pins for the same
* peripheral module) */
void i2c_pinmux_config(unsigned int instance, pinmux_type_t pinmux)
{
switch(instance)
{
#if BL_CONFIG_I2C
case 0:
switch(pinmux)
{
case kPinmuxType_Default:
PORT_BWR_PCR_MUX(PORTD, 8, 0);
PORT_BWR_PCR_ODE(PORTD, 8, 0); // I2C0_SCL set for open drain
PORT_BWR_PCR_MUX(PORTD, 9, 0);
PORT_BWR_PCR_ODE(PORTD, 9, 0); // I2C0_SDA set for open drain
break;
case kPinmuxType_Peripheral:
// Enable pins for I2C0.
PORT_BWR_PCR_MUX(PORTD, 8, 2); // I2C0_SCL is ALT5 for pin PTE24
PORT_BWR_PCR_ODE(PORTD, 8, 1); // I2C0_SCL set for open drain
PORT_BWR_PCR_MUX(PORTD, 9, 2); // I2C0_SDA is ALT5 for pin PTE25
PORT_BWR_PCR_ODE(PORTD, 9, 1); // I2C0_SDA set for open drain
break;
default:
break;
}
break;
#endif // BL_CONFIG_I2C
default:
break;
}
}
/* This function is called for configurating pinmux for i2c module
* This function only support switching default or gpio or fixed-ALTx mode on fixed pins
* (Although there are many ALTx-pinmux configuration choices on various pins for the same
* peripheral module)
*/
void i2c_pinmux_config(unsigned int instance, pinmux_type_t pinmux)
{
switch(pinmux)
{
case kPinmuxType_Default:
PORT_BWR_PCR_MUX(I2C_SCL_PORT, I2C_SCL_PIN, 0);
PORT_BWR_PCR_MUX(I2C_SCL_PORT, I2C_SCL_PIN, 0);
PORT_BWR_PCR_ODE(I2C_SDA_PORT, I2C_SDA_PIN, 0);
PORT_BWR_PCR_ODE(I2C_SDA_PORT, I2C_SDA_PIN, 0);
break;
case kPinmuxType_Peripheral:
// Enable pins for I2C.
PORT_BWR_PCR_MUX(I2C_SCL_PORT, I2C_SCL_PIN, I2C_SCL_ALT);
PORT_BWR_PCR_MUX(I2C_SCL_PORT, I2C_SCL_PIN, I2C_SDA_ALT);
PORT_BWR_PCR_ODE(I2C_SDA_PORT, I2C_SDA_PIN, 0);
PORT_BWR_PCR_ODE(I2C_SDA_PORT, I2C_SDA_PIN, 0);
break;
}
}
