69 lines
3.4 KiB
Python
69 lines
3.4 KiB
Python
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'''
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4. UART 协议模块（midware/protocol/uart_protocol.py）
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实现 UART 协议核心逻辑：寄存器配置、FIFO 缓冲区写入 / 读取、校验和检测、日志记录，严格遵循需求中的字节操作规则：
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'''
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import struct
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from loguru import logger
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from midware.config.base_config import BUS_CONFIG, UART_CHIP_CONFIG, DEVICE_CONFIG_DICT
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from midware.bus.cache_handler import CacheHandler
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from midware.core.error_check import check_checksum
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class UARTProtocol:
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def __init__(self):
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self.cache_handler = CacheHandler() # 缓存交互实例
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self.write_byte = BUS_CONFIG["WRITE_BYTE_UART"] # 每次写入2字节
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self.read_byte = BUS_CONFIG["WRITE_BYTE_UART"] # 每次读取2字节
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def write_uart_fifo(self, device_name, raw_data):
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"""将原始数据写入虚拟芯片FIFO缓冲区，按UART协议每次2字节"""
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if device_name not in DEVICE_CONFIG_DICT:
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logger.error(f"UART外设不存在：{device_name}")
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return False
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# 获取外设基地址、偏移地址
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base_addr = DEVICE_CONFIG_DICT[device_name]["base_addr"]
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offset_addr = DEVICE_CONFIG_DICT[device_name]["offset_addr"]
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# 校验和检测
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if not check_checksum(raw_data, "UART", device_name):
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return False
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# 不定长数据分块，每次2字节写入
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data_len = len(raw_data)
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for i in range(0, data_len, self.write_byte):
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# 截取2字节，不足补0
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chunk = raw_data[i:i+self.write_byte]
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if len(chunk) < self.write_byte:
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chunk += b'\x00' * (self.write_byte - len(chunk))
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# 计算内存地址：基地址+偏移地址
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mem_addr = base_addr + offset_addr + UART_CHIP_CONFIG["TBR"]
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# 写入共享缓存（sysbus WriteDoubleWord）
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self.cache_handler.write_double_word(mem_addr, struct.unpack(">H", chunk)[0])
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logger.debug(f"UART外设{device_name}写入FIFO完成，数据长度：{data_len}")
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return True
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def read_uart_fifo(self, device_name):
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"""从虚拟芯片FIFO缓冲区读取数据，按UART协议每次2字节，组成完整帧"""
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if device_name not in DEVICE_CONFIG_DICT:
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logger.error(f"UART外设不存在：{device_name}")
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return b""
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# 获取外设基地址、偏移地址
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base_addr = DEVICE_CONFIG_DICT[device_name]["base_addr"]
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offset_addr = DEVICE_CONFIG_DICT[device_name]["offset_addr"]
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# 读取FIFO剩余字节数
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remain_addr = base_addr + offset_addr + UART_CHIP_CONFIG["FIFO_REMAIN"]
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remain_bytes = self.cache_handler.read_double_word(remain_addr)
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if remain_bytes == 0:
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logger.debug(f"UART外设{device_name}FIFO缓冲区无数据")
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return b""
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# 分块读取，每次2字节
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raw_data = b""
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for _ in range(0, remain_bytes, self.read_byte):
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mem_addr = base_addr + offset_addr + UART_CHIP_CONFIG["TBR"]
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# 从共享缓存读取（sysbus ReadDoubleWord）
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data = self.cache_handler.read_double_word(mem_addr)
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raw_data += struct.pack(">H", data)
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# 去除补0的空字节，得到完整帧
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raw_data = raw_data.rstrip(b'\x00')
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logger.debug(f"UART外设{device_name}读取FIFO完成，数据长度：{len(raw_data)}")
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return raw_data
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# 全局UART协议实例
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uart_protocol = UARTProtocol()
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