121 lines
1.9 KiB
C++
121 lines
1.9 KiB
C++
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#pragma once
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#include <inttypes.h>
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#include "util.hpp"
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struct SoftTWI {
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constexpr SoftTWI(unsigned sda, unsigned scl, unsigned delay = 0);
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void begin();
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inline void sleep(uint8_t=1) AW_IN {}
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inline void wait_scl() AW_IN;
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void set_pin(uint8_t, bool);
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inline void set_sda(bool) AW_IN;
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inline void set_scl(bool) AW_IN;
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bool read_pin(uint8_t);
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inline bool read_sda() AW_IN;
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inline bool read_scl() AW_IN;
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inline void write_bit(bool) AW_IN;
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bool write(uint8_t);
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unsigned write(const uint8_t*, unsigned);
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inline bool read_bit() AW_IN;
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uint8_t read(bool=true);
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void read(uint8_t*, unsigned, bool=false);
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inline bool start_read(uint8_t) AW_IN;
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inline bool start_write(uint8_t) AW_IN;
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inline void start() AW_IN;
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inline void end() AW_IN;
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private:
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unsigned _sda;
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unsigned _scl;
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unsigned _delay;
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};
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constexpr SoftTWI::SoftTWI(unsigned sda, unsigned scl, unsigned delay)
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: _sda(sda)
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, _scl(scl)
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, _delay(delay) {
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}
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inline void SoftTWI::set_sda(bool s) {
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set_pin(_sda, s);
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}
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inline void SoftTWI::set_scl(bool s) {
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set_pin(_scl, s);
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}
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inline bool SoftTWI::read_sda() {
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return read_pin(_sda);
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}
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inline bool SoftTWI::read_scl() {
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return read_pin(_scl);
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}
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inline void SoftTWI::wait_scl() {
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while(!read_pin(_scl)) {}
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}
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inline bool SoftTWI::read_bit() {
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set_sda(1);
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sleep();
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set_scl(1);
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sleep(2);
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wait_scl();
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bool s = read_sda();
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set_scl(0);
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sleep();
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return s;
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}
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inline void SoftTWI::write_bit(bool s) {
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set_sda(s);
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sleep();
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set_scl(1);
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sleep(2);
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wait_scl();
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set_scl(0);
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sleep();
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}
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inline void SoftTWI::start() {
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set_sda(1);
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sleep();
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set_scl(1);
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sleep();
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set_sda(0);
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sleep();
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set_scl(0);
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sleep();
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}
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inline void SoftTWI::end() {
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set_sda(0);
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sleep();
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set_scl(1);
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sleep();
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set_sda(1);
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sleep(2);
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}
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inline bool SoftTWI::start_read(uint8_t addr) {
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start();
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return write((addr << 1) | 1);
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}
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inline bool SoftTWI::start_write(uint8_t addr) {
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start();
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return write(addr << 1);
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}
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