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revise calculate_checksum

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This commit is contained in:
Tomasz Moń
2009-02-25 20:19:21 +01:00
parent 84e9ab0e01
commit c0ac97d4e2
2 changed files with 22 additions and 15 deletions
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23
gdigi.c
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@@ -62,14 +62,21 @@ char calculate_checksum(gchar *array, int length, int check)
{
int x;
char checksum;
checksum = 0;
checksum = 0x07;
for (x = 0; x<length; x++) {
if (x == check) continue;
checksum ^= array[x];
}
return checksum;
}
/*
opens MIDI device
Returns TRUE on error
*/
gboolean open_device()
{
int err;
@@ -166,7 +173,7 @@ void set_option(guint id, guint position, guint value)
option[12] = value;
option[14] = 0xF7;
option[13] = calculate_checksum(option, 15, 13) ^ 0x07;
option[13] = calculate_checksum(option, 15, 13);
send_data(option, 15);
} else if (value <= 0xFF) {
@@ -179,7 +186,7 @@ void set_option(guint id, guint position, guint value)
option[13] = (value & 0x007F);
option[15] = 0xF7;
option[14] = calculate_checksum(option, 16, 14) ^ 0x07;
option[14] = calculate_checksum(option, 16, 14);
send_data(option, 16);
} else if (value <= 0xFFFF) {
@@ -193,7 +200,7 @@ void set_option(guint id, guint position, guint value)
option[14] = ((value & 0x007F));
option[16] = 0xF7;
option[15] = calculate_checksum(option, 17, 15) ^ 0x07;
option[15] = calculate_checksum(option, 17, 15);
send_data(option, 17);
} else if (value <= 0xFFFFFF) {
@@ -208,7 +215,7 @@ void set_option(guint id, guint position, guint value)
option[15] = ((value & 0x00007F));
option[17] = 0xF7;
option[16] = calculate_checksum(option, 18, 16) ^ 0x07;
option[16] = calculate_checksum(option, 18, 16);
send_data(option, 18);
}
@@ -240,7 +247,7 @@ void switch_user_preset(int x)
static char switch_preset[] = {0x00, 0xF0, 0x00, 0x00, 0x10, 0x00, 0x5E, 0x02, 0x39, 0x00, 0x01 /* bank = user */, 0x00 /* no */, 0x04, 0x00, 0x00, 0x01, 0x00 /* confirm */, 0xF7};
switch_preset[11] = x;
switch_preset[16] = calculate_checksum(switch_preset, sizeof(switch_preset), 16) ^ 0x07;
switch_preset[16] = calculate_checksum(switch_preset, sizeof(switch_preset), 16);
send_data(switch_preset, sizeof(switch_preset));
}
@@ -251,7 +258,7 @@ void switch_system_preset(int x)
static char switch_preset[] = {0x00, 0xF0, 0x00, 0x00, 0x10, 0x00, 0x5E, 0x02, 0x39, 0x00, 0x00 /* bank = system */, 0x00 /* no */, 0x04, 0x00, 0x00, 0x01, 0x00 /* confirm */, 0xF7};
switch_preset[11] = x;
switch_preset[16] = calculate_checksum(switch_preset, sizeof(switch_preset), 16) ^ 0x07;
switch_preset[16] = calculate_checksum(switch_preset, sizeof(switch_preset), 16);
send_data(switch_preset, sizeof(switch_preset));
}
@@ -356,7 +363,7 @@ void set_preset_name(int x, gchar *name)
set_name[12+a+b] = 0x00;
set_name[12+a+2+b] = 0xF7;
set_name[12+a+1+b] = calculate_checksum(set_name, 12+a+3+b, 12+a+1+b) ^ 0x07;
set_name[12+a+1+b] = calculate_checksum(set_name, 12+a+3+b, 12+a+1+b);
send_data(set_name, 13+a+3+b);
}