bool i2cReadRegisterBuffer(unsigned int dev_id, int reg, u8* buffer, size_t buf_size) {
u8 bus_id = i2cGetDeviceBusId(dev_id);
u8 dev_addr = i2cGetDeviceRegAddr(dev_id);
size_t j = 0;
while (!i2cSelectDevice(bus_id, dev_addr)
|| !i2cSelectRegister(bus_id, reg)
|| !i2cSelectDevice(bus_id, dev_addr | 1))
{
i2cWaitBusy(bus_id);
*i2cGetCntReg(bus_id) = 0xC5;
i2cWaitBusy(bus_id);
if (++j >= 8)
return false;
}
if (buf_size != 1) {
for (int i = 0; i < buf_size - 1; i++) {
i2cWaitBusy(bus_id);
*i2cGetCntReg(bus_id) = 0xF0;
i2cWaitBusy(bus_id);
buffer[i] = *i2cGetDataReg(bus_id);
}
}
i2cWaitBusy(bus_id);
*i2cGetCntReg(bus_id) = 0xE1;
i2cWaitBusy(bus_id);
*buffer = *i2cGetDataReg(bus_id);
return true;
}
static bool i2cSelectDevice(u8 bus_id, u8 dev_reg)
{
i2cWaitBusy(bus_id);
*i2cGetDataReg(bus_id) = dev_reg;
*i2cGetCntReg(bus_id) = 0xC2;
return i2cGetResult(bus_id);
}
static bool i2cSelectRegister(u8 bus_id, u8 reg)
{
i2cWaitBusy(bus_id);
*i2cGetDataReg(bus_id) = reg;
*i2cGetCntReg(bus_id) = 0xC0;
return i2cGetResult(bus_id);
}
u8 i2cReadRegister(u8 dev_id, u8 reg) {
u8 bus_id = i2cGetDeviceBusId(dev_id);
u8 dev_addr = i2cGetDeviceRegAddr(dev_id);
for (size_t i = 0; i < 8; i++) {
if (i2cSelectDevice(bus_id, dev_addr) && i2cSelectRegister(bus_id, reg)) {
if (i2cSelectDevice(bus_id, dev_addr | 1)) {
i2cWaitBusy(bus_id);
i2cStop(bus_id, 1);
i2cWaitBusy(bus_id);
return *i2cGetDataReg(bus_id);
}
}
*i2cGetCntReg(bus_id) = 0xC5;
i2cWaitBusy(bus_id);
}
return 0xff;
}
bool i2cWriteRegister(u8 dev_id, u8 reg, u8 data) {
u8 bus_id = i2cGetDeviceBusId(dev_id);
u8 dev_addr = i2cGetDeviceRegAddr(dev_id);
for (int i = 0; i < 8; i++) {
if (i2cSelectDevice(bus_id, dev_addr) && i2cSelectRegister(bus_id, reg)) {
i2cWaitBusy(bus_id);
*i2cGetDataReg(bus_id) = data;
*i2cGetCntReg(bus_id) = 0xC1;
i2cStop(bus_id, 0);
if (i2cGetResult(bus_id))
return true;
}
*i2cGetCntReg(bus_id) = 0xC5;
i2cWaitBusy(bus_id);
}
return false;
}