//*****************************************************************************
//
//! Initialization the I2C bus module.
//!
//! \param bus specifies the i2c bus data structure.
//!
//! This function initialization the I2C hardware bus, it will open the i2c peripheral
//! and config the I2C gpio
//!
//! \return 0 is OK.
//
//*****************************************************************************
int ipmi_i2c_bus_init(ipmi_i2c_bus *bus)
{
//
// Check the arguments.
//
ASSERT(bus->sys_peripheral);
ASSERT(bus->i2c_scl_periph);
ASSERT(bus->i2c_sda_periph);
ASSERT(bus->i2c_scl_gpio_port);
ASSERT(bus->i2c_sda_gpio_port);
ASSERT(bus->i2c_scl_gpio_pin);
ASSERT(bus->i2c_sda_gpio_pin);
ASSERT(bus->i2c_hw_master_base);
// 初始化链表结构
INIT_LIST_HEAD(&bus->list);
// 初始化系统硬件外设
SysCtlPeripheralEnable(bus->sys_peripheral);
// 初始化SCL管脚硬件外设
SysCtlPeripheralEnable(bus->i2c_scl_periph);
if (bus->i2c_scl_gpio_mux)
GPIOPinConfigure(bus->i2c_scl_gpio_mux);
GPIOPinTypeI2C(bus->i2c_scl_gpio_port, bus->i2c_scl_gpio_pin);
// 初始化SDA管脚硬件外设
SysCtlPeripheralEnable(bus->i2c_sda_periph);
if (bus->i2c_sda_gpio_mux)
GPIOPinConfigure(bus->i2c_sda_gpio_mux);
GPIOPinTypeI2C(bus->i2c_sda_gpio_port, bus->i2c_sda_gpio_pin);
// 设备使能，开中断
I2CMasterInit(bus->i2c_hw_master_base, false);
if (bus->i2c_int)
{
//I2CIntRegister(bus->i2c_hw_master_base);
IntEnable(bus->i2c_int);
I2CMasterIntEnable(bus->i2c_hw_master_base);
}
I2CMasterEnable(bus->i2c_hw_master_base);
list_add(&bus->list, &ipmi_i2c_bus_root.head);
ipmi_i2c_bus_root.count++;
return 0;
}
/*
Set up I2C pins and clock slow/fast
rate400 true = 400KHz, false 100KHz
*/
void MasterI2C0Init(int rate400)
{
//I2CMasterEnable(I2C0_MASTER_BASE); // causes fault
//
// Enable the I2C and GPIO port B blocks as they are needed by this driver.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
//Setup Mux
GPIOPinConfigure(GPIO_PB2_I2C0SCL);
GPIOPinConfigure(GPIO_PB3_I2C0SDA);
GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_2 | GPIO_PIN_3); //Set up direction
//Reconfigure for correct operation
GPIOPadConfigSet(GPIO_PORTB_BASE, GPIO_PIN_2, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
GPIOPadConfigSet(GPIO_PORTB_BASE, GPIO_PIN_3, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_OD);
//
// Configure the I2C SCL and SDA pins for I2C operation.
//
//GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, GPIO_PIN_2);
//GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_3);
//
// Initialize the I2C master.
//
I2CMasterInitExpClk(I2C0_MASTER_BASE, SysCtlClockGet(), true);
SysCtlDelay(10000); // delay mandatory here - otherwise portion of SlaveAddrSet() lost!
// Register interrupt handler
// or we could just edit the startup.c file
//I2CIntRegister(I2C0_MASTER_BASE,I2C0IntHandler);
//
// Enable the I2C interrupt.
//
IntEnable(INT_I2C0); // already done via I2CIntRegister
I2CMasterIntEnableEx(I2C0_MASTER_BASE,I2C_MASTER_INT_DATA | I2C_MASTER_INT_TIMEOUT);
//
// Enable the I2C master interrupt.
//
I2CMasterIntEnable(I2C0_MASTER_BASE);
}
static void prvSetupHardware( void )
{
/* Setup the PLL. */
SysCtlClockSet( SYSCTL_SYSDIV_10 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ );
/* Enable the I2C used to read the pot. */
SysCtlPeripheralEnable( SYSCTL_PERIPH_I2C );
SysCtlPeripheralEnable( SYSCTL_PERIPH_GPIOB );
GPIOPinTypeI2C( GPIO_PORTB_BASE, GPIO_PIN_2 | GPIO_PIN_3 );
/* Initialize the I2C master. */
I2CMasterInit( I2C_MASTER_BASE, pdFALSE );
/* Enable the I2C master interrupt. */
I2CMasterIntEnable( I2C_MASTER_BASE );
IntEnable( INT_I2C );
/* Initialise the hardware used to talk to the LED's. */
vParTestInitialise();
}
/*
* ======== I2CCC26XX_hwInit ========
* This functions initializes the I2C hardware module.
*
* @pre Function assumes that the I2C handle is pointing to a hardware
* module which has already been opened.
*/
static void I2CCC26XX_initHw(I2C_Handle handle) {
I2CCC26XX_Object *object;
I2CCC26XX_HWAttrs const *hwAttrs;
Types_FreqHz freq;
/* Get the pointer to the object and hwAttrs */
object = handle->object;
hwAttrs = handle->hwAttrs;
/* Set the I2C configuration */
BIOS_getCpuFreq(&freq);
I2CMasterInitExpClk(hwAttrs->baseAddr, freq.lo, bitRate[object->bitRate]);
/* Clear any pending interrupts */
I2CMasterIntClear(hwAttrs->baseAddr);
/* Enable the I2C Master for operation */
I2CMasterEnable(hwAttrs->baseAddr);
/* Unmask I2C interrupts */
I2CMasterIntEnable(hwAttrs->baseAddr);
}
