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Map hat to axis

pull/26/head
nirenjan 2020-07-11 00:09:39 -07:00
parent 62894dea43
commit 4982071764
2 changed files with 38 additions and 2 deletions
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2
lib/libx52io/io_core.c
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@ -69,7 +69,7 @@ int libx52io_close(libx52io_context *ctx)
int libx52io_open(libx52io_context *ctx)
{
struct hid_device_info *devs, *cur_dev;
int rc = LIBX52IO_SUCCESS;
int rc = LIBX52IO_ERROR_NO_DEVICE;
if (ctx == NULL) {
return LIBX52IO_ERROR_INVALID;

38
lib/libx52io/io_parser.c
View File

@ -10,6 +10,35 @@
#include "io_common.h"
#include "usb-ids.h"
static void map_hat(uint8_t hat, libx52io_report *report)
{
/*
* Hat reports values from 0-8, but just to account for any spurious
* values, leave the remaining 7 entries blank.
*
* Pushing the hat North reports 1, and it increases to 2 for NE, 3 for
* East, 4 for SE and so on in a clockwise fashion until it hits 8 for NW.
*
* According to the USB spec, Y axis increases as it is pulled from front
* to back, i.e., further from the user to closer to the user, and X axis
* increases left to right. Therefore NE is X=+1, Y=-1.
*/
static const int32_t hat_to_axis[16][2] = {
{0, 0},
{0, -1},
{1, -1},
{1, 0},
{1, 1},
{0, 1},
{-1, 1},
{-1, 0},
{-1, -1},
};
report->axis[LIBX52IO_AXIS_HATX] = hat_to_axis[hat][0];
report->axis[LIBX52IO_AXIS_HATY] = hat_to_axis[hat][1];
}
static void map_axis(unsigned char *data, int thumb_pos, libx52io_report *report)
{
/*
@ -23,6 +52,13 @@ static void map_axis(unsigned char *data, int thumb_pos, libx52io_report *report
report->axis[LIBX52IO_AXIS_SLIDER] = data[7];
report->axis[LIBX52IO_AXIS_THUMBX] = data[thumb_pos] & 0xf;
report->axis[LIBX52IO_AXIS_THUMBY] = data[thumb_pos] >> 4;
/*
* The hat report is in the upper 4 bits of the byte preceding the
* thumbstick report. Use that to map to the axis values
*/
report->hat = data[thumb_pos-1] >> 4;
map_hat(report->hat, report);
}
static void map_buttons(unsigned char *data, const int *button_map, libx52io_report *report)
@ -42,7 +78,7 @@ static void map_buttons(unsigned char *data, const int *button_map, libx52io_rep
for (i = 0; button_map[i] != -1; i++) {
int btn = button_map[i];
report->button[btn] = !!(buttons & (1 << i));
report->button[btn] = !!(buttons & ((uint64_t)1 << i));
}
if (report->button[LIBX52IO_BTN_MODE_1]) {