mirror of
https://github.com/Sucareto/ESP32-CardReader.git
synced 2024-11-28 01:10:52 +01:00
77 lines
1.6 KiB
C++
77 lines
1.6 KiB
C++
/*
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库代码来自：https://github.com/spicetools/spicetools/tree/master/api/resources/arduino
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删除了未使用的函数。
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*/
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#ifndef SPICEAPI_CONNECTION_H
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#define SPICEAPI_CONNECTION_H
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#include <stdint.h>
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#ifndef SPICEAPI_INTERFACE
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#define SPICEAPI_INTERFACE Serial
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#endif
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namespace spiceapi {
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class Connection {
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private:
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uint8_t* receive_buffer;
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size_t receive_buffer_size;
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public:
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Connection(size_t receive_buffer_size);
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void reset();
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const char* request(char* json);
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};
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}
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spiceapi::Connection::Connection(size_t receive_buffer_size) {
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this->receive_buffer = new uint8_t[receive_buffer_size];
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this->receive_buffer_size = receive_buffer_size;
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this->reset();
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}
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void spiceapi::Connection::reset() {
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// drop all input
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while (SPICEAPI_INTERFACE.available()) {
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SPICEAPI_INTERFACE.read();
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}
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}
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const char* spiceapi::Connection::request(char* json_data) {
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auto json_len = strlen(json_data) + 1;
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// send
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auto send_result = SPICEAPI_INTERFACE.write((const char*)json_data, (int)json_len);
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SPICEAPI_INTERFACE.flush();
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if (send_result < (int)json_len) {
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return "";
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}
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// receive
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size_t receive_data_len = 0;
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while (SPICEAPI_INTERFACE) {
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// read single byte
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auto b = SPICEAPI_INTERFACE.read();
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if (b < 0) continue;
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receive_buffer[receive_data_len++] = b;
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// check for buffer overflow
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if (receive_data_len >= receive_buffer_size) {
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this->reset();
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return "";
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}
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// check for message end
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if (receive_buffer[receive_data_len - 1] == 0)
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break;
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}
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// return resulting json
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return (const char*)&receive_buffer[0];
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}
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#endif //SPICEAPI_CONNECTION_H
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