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This commit is contained in:
Thomas Harte
2024-03-16 22:02:16 -04:00
parent 47e9279bd4
commit 2712d50e05
2 changed files with 47 additions and 1 deletions
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Components/I2C/I2C.cpp
+36 -1
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@@ -25,9 +25,44 @@ bool Bus::clock() {
}
void Bus::set_clock_data(bool clock_pulled, bool data_pulled) {
// TODO: all intelligence.
const bool has_new_bit = clock_pulled && !clock_;
clock_ = clock_pulled;
data_ = data_pulled;
// TODO: "Stop condition: SDA goes high after SCL (?)".
if(has_new_bit) {
// Test for a start bit.
//
// "Start condition: SDA goes low before SCL".
if(input_count_ < 0 && data_) {
input_count_ = 0;
}
// Accumulate if started.
if(input_count_ >= 0) {
input_ = uint16_t((input_ << 1) | (data_pulled ? 0 : 1));
++input_count_;
}
// Test for meaning.
switch(phase_) {
case Phase::AwaitingAddress:
if(input_count_ == 9) {
printf("Calling %02x?", uint8_t(input_));
auto pair = peripherals_.find(uint8_t(input_));
if(pair != peripherals_.end()) {
active_peripheral_ = pair->second;
// TODO: device found; pull data low for the next clock.
}
}
break;
case Phase::CollectingData:
break;
}
}
}
void Bus::add_peripheral(Peripheral *peripheral, int address) {