diff options
Diffstat (limited to 'src/storage.cc')
| -rw-r--r-- | src/storage.cc | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/storage.cc b/src/storage.cc index 4decc27..71265a8 100644 --- a/src/storage.cc +++ b/src/storage.cc @@ -46,6 +46,8 @@ void Storage::enable() */ TWSR = 0; // the lower two bits control TWPS TWBR = ((F_CPU / 100000UL) - 16) / 2; + + i2c_read(0, 1, &num_anims); } @@ -168,3 +170,35 @@ int8_t Storage::i2c_read(uint16_t pos, uint8_t len, uint8_t *data) return 0; // TODO proper return code to indicate read/write errors } + +void Storage::reset() +{ + uint8_t data = 0; + i2c_write(0, 1, &data); + first_free_page = 0; +} + +void Storage::load(uint16_t idx, uint8_t *data) +{ + uint8_t page_offset; + uint8_t header[2]; + i2c_read(1 + idx, 1, &page_offset); + + i2c_read(256 + (64 * (uint16_t)page_offset), 2, header); + i2c_read(256 + (64 * (uint16_t)page_offset) + 2, (header[0] << 4) + (header[1] >> 4), data); +} + +void Storage::save(uint16_t idx, uint8_t *data) +{ + i2c_write(1 + idx, 1, &first_free_page); + append(data); +} + +void Storage::append(uint8_t *data) +{ + // the header indicates the length of the data, but we really don't care + // - it's easier to just write the whole page and skip the trailing + // garbage when reading. + i2c_write(256 + (64 * (uint16_t)first_free_page), 64, data); + first_free_page++; +} |