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Make the left keyboard half send the state of the keys to the right half via I2C and make the right half send the relevant scancodes to the host via USB.

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This commit is contained in:
László Monda
2016-10-12 03:03:59 +02:00
parent cbe8c953a0
commit 80ddf397fd
6 changed files with 139 additions and 45 deletions
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22
right/src/usb_interface_keyboard.c
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@@ -3,6 +3,9 @@
#include "usb_composite_device.h"
#include "test_led.h"
#include "key_matrix.h"
#include "fsl_i2c.h"
#include "i2c.h"
#include "i2c_addresses.h"
static usb_device_endpoint_struct_t UsbKeyboardEndpoints[USB_KEYBOARD_ENDPOINT_COUNT] = {{
USB_KEYBOARD_ENDPOINT_INDEX | (USB_IN << USB_DESCRIPTOR_ENDPOINT_ADDRESS_DIRECTION_SHIFT),
@@ -62,6 +65,9 @@ key_matrix_t keyMatrix = {
}
};
#define KEY_STATE_COUNT (5*7)
uint8_t leftKeyStates[KEY_STATE_COUNT] = {0};
static usb_status_t UsbKeyboardAction(void)
{
UsbKeyboardReport.modifiers = 0;
@@ -75,6 +81,16 @@ static usb_status_t UsbKeyboardAction(void)
UsbKeyboardReport.scancodes[scancodeIdx] = 0;
}
i2c_master_transfer_t masterXfer;
masterXfer.slaveAddress = I2C_ADDRESS_LEFT_KEYBOARD_HALF;
masterXfer.direction = kI2C_Read;
masterXfer.subaddress = 0;
masterXfer.subaddressSize = 0;
masterXfer.data = leftKeyStates;
masterXfer.dataSize = KEY_STATE_COUNT;
masterXfer.flags = kI2C_TransferDefaultFlag;
I2C_MasterTransferBlocking(I2C_MAIN_BUS_BASEADDR, &masterXfer);
scancodeIdx = 0;
for (uint8_t keyId=0; keyId<KEYBOARD_MATRIX_COLS_NUM*KEYBOARD_MATRIX_ROWS_NUM; keyId++) {
if (keyMatrix.keyStates[keyId] && scancodeIdx<USB_KEYBOARD_MAX_KEYS) {
@@ -82,6 +98,12 @@ static usb_status_t UsbKeyboardAction(void)
}
}
for (uint8_t keyId=0; keyId<KEY_STATE_COUNT; keyId++) {
if (leftKeyStates[keyId] && scancodeIdx<USB_KEYBOARD_MAX_KEYS) {
UsbKeyboardReport.scancodes[scancodeIdx++] = keyId + HID_KEYBOARD_SC_A;
}
}
return USB_DeviceHidSend(UsbCompositeDevice.keyboardHandle, USB_KEYBOARD_ENDPOINT_INDEX,
(uint8_t*)&UsbKeyboardReport, USB_KEYBOARD_REPORT_LENGTH);
}