int i2c_init(i2c_connection conn) {
struct i2c_state *c = (struct i2c_state *) conn;
c->base = I2CA0_BASE;
c->sda_pin_mode = MAP_PinModeGet(c->scl_pin);
MAP_PinConfigGet(c->sda_pin, &c->sda_pin_strength, &c->sda_pin_type);
MAP_PinTypeI2C(c->sda_pin, PIN_MODE_1); /* SDA */
c->scl_pin_mode = MAP_PinModeGet(c->scl_pin);
MAP_PinConfigGet(c->scl_pin, &c->scl_pin_strength, &c->scl_pin_type);
MAP_PinTypeI2C(c->scl_pin, PIN_MODE_1); /* SCL */
MAP_PRCMPeripheralClkEnable(PRCM_I2CA0, PRCM_RUN_MODE_CLK);
MAP_PRCMPeripheralReset(PRCM_I2CA0);
MAP_I2CMasterInitExpClk(c->base, SYS_CLK, 0 /* 100 KHz */);
return 0;
}
static void apply_io_park(u8 pin_num,
enum io_park_state park_value)
{
u32 pin_strength, pin_type;
if(DONT_CARE != park_value) {
/* Change the pin mode to GPIO to be safe */
//MAP_PinModeSet(pin_num, PIN_MODE_0);
/* First apply PullUp/PullDn (or no pull) according
to the default levels specified in the user supplied
parking table */
MAP_PinConfigGet(pin_num, &pin_strength, &pin_type);
if(NO_PULL_HIZ != park_value) {
MAP_PinConfigSet(pin_num, pin_strength, park_value);
} else {
MAP_PinConfigSet(pin_num, pin_strength, PIN_TYPE_STD);
}
/* One by one HiZ all the IOs,
by writing the register that drives IOEN_N control
pin of the IOs. This register and the signal path is
always-on and hence not get lost during True-LPDS */
MAP_PinDirModeSet(pin_num, PIN_DIR_MODE_IN);
/* Once all the digital IOs has been made HiZ,
the desired default PAD levels would be held by
the weak-pulls. Input buffers would be alive
(such as auto-SPI or wake-GPIOs) and would not
have Iddq issue since pulls are present. */
}
return;
}
