142 lines
3.2 KiB
C++
142 lines
3.2 KiB
C++
#include <Adafruit_BusIO_Register.h>
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Adafruit_BusIO_Register::Adafruit_BusIO_Register(Adafruit_I2CDevice *i2cdevice, uint16_t reg_addr, uint8_t width, uint8_t bitorder, uint8_t address_width) {
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_i2cdevice = i2cdevice;
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_spidevice = NULL;
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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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/*
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Adafruit_BusIO_Register::Adafruit_BusIO_Register(Adafruit_SPIDevice *spidevice, uint16_t reg_addr, uint8_t width, uint8_t bitorder, uint8_t address_width) {
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_spidevice = spidevice;
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_i2cdevice = NULL;
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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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*/
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bool Adafruit_BusIO_Register::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 (_i2cdevice && ! _i2cdevice->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_BusIO_Register::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_BusIO_Register::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 == LSBFIRST) {
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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_BusIO_Register::read(uint8_t *buffer, uint8_t len) {
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_buffer[0] = _address;
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if (_i2cdevice && ! _i2cdevice->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_BusIO_Register::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_BusIO_Register::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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void Adafruit_BusIO_Register::print(Stream *s) {
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uint32_t val = read();
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s->print("0x"); s->print(val, HEX);
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}
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void Adafruit_BusIO_Register::println(Stream *s) {
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print(s);
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s->println();
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}
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Adafruit_BusIO_RegisterBits::Adafruit_BusIO_RegisterBits(Adafruit_BusIO_Register *reg, uint8_t bits, uint8_t shift) {
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_register = reg;
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_bits = bits;
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_shift = shift;
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}
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uint32_t Adafruit_BusIO_RegisterBits::read(void) {
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uint32_t val = _register->read();
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val >>= _shift;
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return val & ((1 << (_bits+1)) - 1);
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}
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void Adafruit_BusIO_RegisterBits::write(uint32_t data) {
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uint32_t val = _register->read();
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// mask off the data before writing
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uint32_t mask = (1 << (_bits+1)) - 1;
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data &= mask;
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mask <<= _shift;
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val &= ~mask; // remove the current data at that spot
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val |= data << _shift; // and add in the new data
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_register->write(val, _register->width());
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}
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