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Verify the integrity of key state update messages using CRC16-CCITT.

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This commit is contained in:
László Monda
2017-05-31 03:26:50 +02:00
parent 57319489d2
commit 1e290ebc34
6 changed files with 38 additions and 3 deletions
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5
right/src/slave_drivers/slave_driver_uhk_module.c
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@@ -6,6 +6,7 @@
#include "peripherals/test_led.h"
#include "test_states.h"
#include "bool_array_converter.h"
#include "crc16.h"
uhk_module_state_t UhkModuleStates[UHK_MODULE_MAX_COUNT];
uhk_module_field_t currentUhkModuleField = UhkModuleField_SendKeystatesRequestCommand;
@@ -38,7 +39,9 @@ void UhkModuleSlaveDriver_Update(uint8_t uhkModuleId)
currentUhkModuleField = UhkModuleField_SendPwmBrightnessCommand;
break;
case UhkModuleField_SendPwmBrightnessCommand:
BoolBitsToBytes(rxBuffer, CurrentKeyStates[SLOT_ID_LEFT_KEYBOARD_HALF], LEFT_KEYBOARD_HALF_KEY_COUNT);
if (CRC16_IsMessageValid(rxBuffer, KEY_STATE_SIZE)) {
BoolBitsToBytes(rxBuffer, CurrentKeyStates[SLOT_ID_LEFT_KEYBOARD_HALF], LEFT_KEYBOARD_HALF_KEY_COUNT);
}
txBuffer[0] = SlaveCommand_SetLedPwmBrightness;
txBuffer[1] = uhkModuleInternalState->ledPwmBrightness;
I2cAsyncWrite(I2C_ADDRESS_LEFT_KEYBOARD_HALF, txBuffer, 2);

4
right/src/slave_drivers/slave_driver_uhk_module.h
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@@ -4,11 +4,13 @@
// Includes:
#include "fsl_common.h"
#include "crc16.h"
// Macros:
#define UHK_MODULE_MAX_COUNT 1
#define KEY_STATE_BUFFER_SIZE (LEFT_KEYBOARD_HALF_KEY_COUNT/8 + 1)
#define KEY_STATE_SIZE (LEFT_KEYBOARD_HALF_KEY_COUNT/8 + 1)
#define KEY_STATE_BUFFER_SIZE (KEY_STATE_SIZE + CRC16_HASH_LENGTH)
// Typedefs: