1 files changed, 57 insertions, 0 deletions
diff --git a/quantum/api/api_sysex.c b/quantum/api/api_sysex.c
new file mode 100644
index 0000000000..868f854b92
--- /dev/null
+++ b/quantum/api/api_sysex.c
@@ -0,0 +1,57 @@
+#include "api_sysex.h"
+#include "sysex_tools.h"
+#include "print.h"
+
+void send_bytes_sysex(uint8_t message_type, uint8_t data_type, uint8_t * bytes, uint16_t length) {
+    // SEND_STRING("\nTX: ");
+    // for (uint8_t i = 0; i < length; i++) {
+    //     send_byte(bytes[i]);
+    //     SEND_STRING(" ");
+    // }
+    if (length > API_SYSEX_MAX_SIZE) {
+        xprintf("Sysex msg too big %d %d %d", message_type, data_type, length);
+        return;
+    }
+
+
+    // The buffer size required is calculated as the following
+    // API_SYSEX_MAX_SIZE is the maximum length
+    // In addition to that we have a two byte message header consisting of the message_type and data_type
+    // This has to be encoded with an additional overhead of one byte for every starting 7 bytes
+    // We just add one extra byte in case it's not divisible by 7
+    // Then we have an unencoded header consisting of 4 bytes
+    // Plus a one byte terminator
+    const unsigned message_header = 2;
+    const unsigned unencoded_message = API_SYSEX_MAX_SIZE + message_header;
+    const unsigned encoding_overhead = unencoded_message / 7 + 1;
+    const unsigned encoded_size = unencoded_message + encoding_overhead;
+    const unsigned unencoded_header = 4;
+    const unsigned terminator = 1;
+    const unsigned buffer_size = encoded_size + unencoded_header + terminator;
+    uint8_t buffer[encoded_size + unencoded_header + terminator];
+    // The unencoded header
+    buffer[0] = 0xF0;
+    buffer[1] = 0x00;
+    buffer[2] = 0x00;
+    buffer[3] = 0x00;
+
+    // We copy the message to the end of the array, this way we can do an inplace encoding, using the same
+    // buffer for both input and output
+    const unsigned message_size = length + message_header;
+    uint8_t* unencoded_start = buffer + buffer_size - message_size;
+    uint8_t* ptr = unencoded_start;
+    *(ptr++) = message_type;
+    *(ptr++) = data_type;
+    memcpy(ptr, bytes, length);
+
+    unsigned encoded_length = sysex_encode(buffer + unencoded_header, unencoded_start, message_size);
+    unsigned final_size = unencoded_header + encoded_length + terminator;
+    buffer[final_size - 1] = 0xF7;
+    midi_send_array(&midi_device, final_size, buffer);
+
+    // SEND_STRING("\nTD: ");
+    // for (uint8_t i = 0; i < encoded_length + 5; i++) {
+    //     send_byte(buffer[i]);
+    //     SEND_STRING(" ");
+    // }
+}