93 lines
1.9 KiB
C++
93 lines
1.9 KiB
C++
#include <Adafruit_I2CRegister.h>
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Adafruit_I2CRegister::Adafruit_I2CRegister(Adafruit_I2CDevice *device, uint16_t reg_addr, uint8_t width, uint8_t bitorder, uint8_t address_width) {
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_device = device;
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_addrwidth = address_width;
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_address = reg_addr;
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_bitorder = bitorder;
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_width = width;
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}
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bool Adafruit_I2CRegister::write(uint8_t *buffer, uint8_t len) {
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uint8_t addrbuffer[2] = {(uint8_t)(_address & 0xFF), (uint8_t)(_address>>8)};
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if (! _device->write(buffer, len, true, addrbuffer, _addrwidth)) {
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return false;
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}
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return true;
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}
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bool Adafruit_I2CRegister::write(uint32_t value, uint8_t numbytes) {
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if (numbytes == 0) {
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numbytes = _width;
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}
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if (numbytes > 4) {
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return false;
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}
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for (int i=0; i<numbytes; i++) {
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if (_bitorder == LSBFIRST) {
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_buffer[i] = value & 0xFF;
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} else {
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_buffer[numbytes-i-1] = value & 0xFF;
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}
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value >>= 8;
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}
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return write(_buffer, numbytes);
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}
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// This does not do any error checking! returns 0xFFFFFFFF on failure
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uint32_t Adafruit_I2CRegister::read(void) {
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if (! read(_buffer, _width)) {
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return -1;
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}
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uint32_t value = 0;
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for (int i=0; i < _width; i++) {
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value <<= 8;
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if (_bitorder == MSBFIRST) {
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value |= _buffer[_width-i-1];
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} else {
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value |= _buffer[i];
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}
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}
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return value;
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}
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bool Adafruit_I2CRegister::read(uint8_t *buffer, uint8_t len) {
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_buffer[0] = _address;
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if (! _device->write_then_read(_buffer, 1, buffer, len)) {
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return false;
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}
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return true;
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}
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bool Adafruit_I2CRegister::read(uint16_t *value) {
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if (! read(_buffer, 2)) {
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return false;
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}
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if (_bitorder == LSBFIRST) {
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*value = _buffer[1];
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*value <<= 8;
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*value |= _buffer[0];
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} else {
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*value = _buffer[0];
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*value <<= 8;
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*value |= _buffer[1];
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}
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return true;
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}
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bool Adafruit_I2CRegister::read(uint8_t *value) {
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if (! read(_buffer, 1)) {
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return false;
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}
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*value = _buffer[0];
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return true;
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}
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