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/* modbus 主机实现*/
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#include<stdint.h>
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static uint8_t s_tx_buffer[512];
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static uint16_t s_tx_length;
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static uint8_t rx_buffer[512];
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// 读取保持寄存器的值
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// addr 寄存器地址
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// id 丛机地址
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// length 读取丛机数据长度
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int modbus_m_read_regist(uint8_t id,uint16_t addr,uint16_t length)
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{
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}
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