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Update Main for 2x2 HID keyboard

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Updated the main.c file to implement a 2x2 matrix keyboard functionality. The code now reads key presses and sends corresponding HID reports.
This commit is contained in:
Nolan Nguyen
2025-09-07 22:26:44 -07:00
committed by GitHub
parent 92f4af5d09
commit 8e0ae599a7
1 changed files with 31 additions and 4 deletions
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35
firmware/modularkbd/Core/Src/main.c
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@@ -131,11 +131,38 @@ int main(void)
/* Infinite loop */ /* Infinite loop */
/* USER CODE BEGIN WHILE */ /* USER CODE BEGIN WHILE */
// 2x2 Matrix Keyboard: Rows = PC6, PC7; Cols = PC4, PC5
// Key mapping: [Row0-Col0]='M', [Row0-Col1]='I', [Row1-Col0]='K', [Row1-Col1]='U'
const uint8_t keycodes[2][2] = {
{0x10, 0x0C}, // 'M', 'I' (HID keycodes)
{0x0E, 0x18} // 'K', 'U'
};
uint8_t prev_state[2][2] = {{1,1},{1,1}}; // Inputs are HIGH by default
while (1) while (1)
{ {
USBREPORT.KEYCODE1 = 0x0A; for (int row = 0; row < 2; row++) {
USBD_HID_SendReport(&hUsbDeviceFS, &USBREPORT, sizeof(USBREPORT)); // Set current row LOW, other HIGH
HAL_Delay(1000); HAL_GPIO_WritePin(GPIOC, GPIO_PIN_6, (row == 0) ? GPIO_PIN_RESET : GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_7, (row == 1) ? GPIO_PIN_RESET : GPIO_PIN_SET);
HAL_Delay(1);
uint8_t col0 = HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_4);
uint8_t col1 = HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_5);
uint8_t curr_state[2] = {col0, col1};
for (int col = 0; col < 2; col++) {
if (curr_state[col] == GPIO_PIN_RESET && prev_state[row][col] == GPIO_PIN_SET) {
// Key pressed (edge, input goes LOW)
USBREPORT.KEYCODE1 = keycodes[row][col];
USBD_HID_SendReport(&hUsbDeviceFS, &USBREPORT, sizeof(USBREPORT));
}
if (curr_state[col] == GPIO_PIN_SET && prev_state[row][col] == GPIO_PIN_RESET) {
// Key released (input goes HIGH)
USBREPORT.KEYCODE1 = 0;
USBD_HID_SendReport(&hUsbDeviceFS, &USBREPORT, sizeof(USBREPORT));
}
prev_state[row][col] = curr_state[col];
}
}
HAL_Delay(10);
/* USER CODE END WHILE */ /* USER CODE END WHILE */
/* USER CODE BEGIN 3 */ /* USER CODE BEGIN 3 */
@@ -514,7 +541,7 @@ static void MX_GPIO_Init(void)
/*Configure GPIO pins : PC4 PC5 */ /*Configure GPIO pins : PC4 PC5 */
GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5; GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Pull = GPIO_PULLUP;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct); HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
/*Configure GPIO pins : PB0 PB1 PB2 PB10 */ /*Configure GPIO pins : PB0 PB1 PB2 PB10 */