void u8g_i2c_init(uint8_t options)
{
u8g_i2c_opt = options;
u8g_i2c_clear_error();
if ( u8g_i2c_opt & U8G_I2C_OPT_FAST )
{
i2c_delay = i2c_400KHz_delay;
}
else
{
i2c_delay = i2c_100KHz_delay;
}
if ( u8g_i2c_opt & U8G_I2C_OPT_DEV_1 )
{
i2c_scl_pin = PIN_WIRE1_SCL;
i2c_sda_pin = PIN_WIRE1_SDA;
//REG_PIOA_PDR = PIO_PB12A_TWD1 | PIO_PB13A_TWCK1;
}
else
{
i2c_scl_pin = PIN_WIRE_SCL;
i2c_sda_pin = PIN_WIRE_SDA;
//REG_PIOA_PDR = PIO_PA17A_TWD0 | PIO_PA18A_TWCK0;
}
i2c_init();
}
void u8g_i2c_init(uint8_t options)
{
/*
TWBR: bit rate register
TWSR: status register (contains preselector bits)
prescalar
0 1
1 4
2 16
3 64
f = F_CPU/(16+2*TWBR*prescalar)
F_CPU = 16MHz
TWBR = 152;
TWSR = 0;
--> 50KHz
TWBR = 72;
TWSR = 0;
--> 100KHz
F_CPU/(2*100000)-8 --> calculate TWBR value for 100KHz
*/
TWSR = 0;
TWBR = F_CPU/(2*100000)-8;
u8g_i2c_clear_error();
}
void u8g_i2c_init(uint8_t options) {
u8g_i2c_clear_error();
u8g_i2c_opt = options;
if (wiringPiSetup() == -1) {
printf("wiringPi-Error\n");
exit(1);
}
fd = wiringPiI2CSetup(I2C_SLA);
if (fd < 0) {
printf ("Unable to open I2C device 0: %s\n", strerror (errno)) ;
exit (1) ;
}
//u8g_SetPIOutput(u8g, U8G_PI_RESET);
//u8g_SetPIOutput(u8g, U8G_PI_A0);
}
void u8g_i2c_init(uint8_t options)
{
/*
TWBR: bit rate register
TWSR: status register (contains preselector bits)
prescalar
0 1
1 4
2 16
3 64
f = F_CPU/(16+2*TWBR*prescalar)
F_CPU = 16MHz
TWBR = 152;
TWSR = 0;
--> 50KHz
TWBR = 72;
TWSR = 0;
--> 100KHz
TWBR = 12;
TWSR = 0;
--> 400KHz
F_CPU/(2*100000)-8 --> calculate TWBR value for 100KHz
*/
u8g_i2c_opt = options;
TWSR = 0;
if ( options & U8G_I2C_OPT_FAST )
{
TWBR = F_CPU/(2*400000)-8;
}
else
{
TWBR = F_CPU/(2*100000)-8;
}
u8g_i2c_clear_error();
}
void u8g_i2c_init(uint8_t options)
{
u8g_i2c_clear_error();
}
