58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// READ:
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// CPU sends CMD_READ + filename as 0 terminated string
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// MCU sends $00 + 2 bytes file length (MSB first) + file data bytes (if OK)
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// MCU sends $FF + string error description (if error)
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//
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// global start_address
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// global len
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// global token_ptr
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void comando_read() {
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// send command byte
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send_byte_to_MCU(CMD_READ);
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if(TIMEOUT) return;
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// send filename
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send_string_to_MCU(filename);
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if(TIMEOUT) return;
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// response
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byte response = receive_byte_from_MCU();
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if(TIMEOUT) return;
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if(response == ERR_RESPONSE) {
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// error with file, print message
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print_string_response();
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return;
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}
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// get file length in tmpword
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receive_word_from_mcu();
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if(TIMEOUT) return;
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// get file bytes
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token_ptr = (byte *) start_address;
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for(word t=0;t!=tmpword;t++) {
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byte data = receive_byte_from_MCU();
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if(TIMEOUT) return;
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*token_ptr++ = data;
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}
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// decrease by one for display result
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token_ptr--;
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// print feedback to user
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woz_putc('\r');
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woz_puts(filename);
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woz_puts("\r$");
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woz_print_hexword(start_address);
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woz_puts("-$");
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woz_print_hexword((word)token_ptr);
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woz_puts(" (");
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utoa(tmpword, filename, 10); // use filename as string buffer
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woz_puts(filename);
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woz_puts(" BYTES)\rOK");
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}
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