uint8_t i2c_write(uint8_t data) {
i2c_sclLo();
uint8_t mask;
for (mask = 0x80; mask != 0; mask >>=1) {
i2c_sdaOut(data & mask);
i2c_sclHi();
i2c_sclLo();
}
i2c_sdaOut(1);
i2c_sclHi();
uint8_t ack = ! i2c_sdaIn();
i2c_sclLo();
return ack;
}
INLINE bool i2c_bitbang_start_1(struct I2c *i2c)
{
bool ret;
/* Clear all error, we restart */
i2c->errors &= ~(I2C_NO_ACK | I2C_ARB_LOST);
if (old_api)
{
SDA_HI;
SCL_HI;
I2C_HALFBIT_DELAY();
SDA_LO;
I2C_HALFBIT_DELAY();
ret = !SDA_IN;
}
else
{
i2c_sdaHi(I2C_DEV(i2c));
i2c_sclHi(I2C_DEV(i2c));
i2c_halfbitDelay(I2C_DEV(i2c));
i2c_sdaLo(I2C_DEV(i2c));
i2c_halfbitDelay(I2C_DEV(i2c));
ret = !i2c_sdaIn(I2C_DEV(i2c));
}
return ret;
}
uint8_t i2c_read(uint8_t last) {
uint8_t data = 0;
uint8_t mask;
for (mask = 0x80; mask !=0; mask >>=1) {
i2c_sclHi();
if (i2c_sdaIn()) {
data |= mask;
}
i2c_sclLo();
}
i2c_sdaOut(last);
i2c_sclHi();
i2c_sclLo();
if (last) {
i2c_stop();
}
i2c_sdaOut(1);
return data;
}
static void i2c_bitbang_stop_1(struct I2c *i2c)
{
if (old_api)
{
SDA_LO;
SCL_HI;
I2C_HALFBIT_DELAY();
SDA_HI;
}
else
{
i2c_sdaLo(I2C_DEV(i2c));
i2c_sclHi(I2C_DEV(i2c));
i2c_halfbitDelay(I2C_DEV(i2c));
i2c_sdaHi(I2C_DEV(i2c));
}
}
void i2c_stop() {
i2c_sdaOut(0);
i2c_sclHi();
i2c_sdaOut(1);
}
uint8_t i2c_start(uint8_t addr) {
i2c_sclLo();
i2c_sclHi();
i2c_sdaOut(0);
return i2c_write(addr);
}
void i2c_init() {
i2c_sdaOut(1);
PINMODE(SCL_DDR,SCL,OUTPUT);
i2c_sclHi();
}
