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                // Calculate crc on written data.
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                // Calculate crc on written data.
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                //TODO: This will not work if data is not sent sequentially without
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                //TODO: This will not work if data is not sent sequentially without
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                // holes, starting with offset=0. We might want to send a NACK if the
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                // holes, starting with offset=0. We might want to send a NACK if the
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                // offset in a CAN_NMT_PGM_DATA msg differs from the expected offset.
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                // offset in a CAN_NMT_PGM_DATA msg differs from the expected offset.
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                uint16_t loc, crc = 0;
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                uint16_t loc, crc = 0;
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                for (loc = base_addr; loc < addr - 2; loc++) { // addr will be last location written + 2.
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                for (loc = base_addr; loc < addr; loc++) { // addr will be last location written + 2.
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                    crc = _crc16_update(crc, pgm_read_byte(loc));
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                    crc = _crc16_update(crc, pgm_read_byte(loc));
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                }
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                }
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                tx_msg.Data.words[0] = crc;
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                tx_msg.Data.words[0] = crc;
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                send_msg = 1;
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                send_msg = 1;