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#include "scan_matrix.h"
#include "stm32f0xx_hal.h"
namespace stm32 {
ScanMatrix::ScanMatrix(GPIOPin* rows,
GPIOPin* columns,
const uint8_t row_count,
const uint8_t column_count) :
rows_(rows),
columns_(columns),
row_count_(row_count),
column_count_(column_count)
{ }
void ScanMatrix::Init() {
init_rows();
init_columns();
}
void ScanMatrix::init_rows() {
for (unsigned int i = 0; i < row_count_; i++) {
GPIOPin& row_pin = rows_[i];
row_pin.set_mode(GPIOPin::Mode::IN);
row_pin.set_pupd(GPIOPin::PuPd::UP);
row_pin.set_speed(GPIOPin::Speed::TWO_MHZ);
row_pin.Init();
}
}
void ScanMatrix::init_columns() {
for (unsigned int i = 0; i < column_count_; i++) {
GPIOPin& column_pin = columns_[i];
column_pin.set_mode(GPIOPin::Mode::OUT);
column_pin.set_pupd(GPIOPin::PuPd::UP);
column_pin.set_output(GPIOPin::OType::OPEN_DRAIN);
column_pin.set_speed(GPIOPin::Speed::TWO_MHZ);
column_pin.Init();
}
}
int ScanMatrix::Scan(bool* key_scans, const size_t row_len, const size_t column_len) {
if (row_len > row_count_ || column_len > column_count_) {
return -1;
}
for (unsigned int column = 0; column < column_count_; column++) {
GPIOPin& column_pin = columns_[column];
column_pin.Set(false);
for (unsigned int row = 0; row < row_count_; row++) {
GPIOPin& row_pin = rows_[row];
key_scans[(row*column_count_)+column] = !row_pin.Read();
}
column_pin.Set(true);
}
return 0;
}
bool ScanMatrix::ScanKey(const uint8_t row, const uint8_t column) {
if ((row > row_count_ - 1) || (column > column_count_ - 1)) {
return false;
}
GPIOPin& row_pin = rows_[row];
GPIOPin& column_pin = columns_[column];
column_pin.Set(false);
bool read = row_pin.Read();
column_pin.Set(true);
return !read;
}
}