I want to use ILID9341 screen on STM32F407G-DISC1 without any libraries, just spi protocol. However, while the screen turns on, I can't draw anything on it. Why is this the case?
This is SPI configuration.
I have checked the physical wiring, and it seems to be correct.
This is the code that is relevant for the LCD screen (there is also a code for functions for reading values from accelometer, which is probably not relevant).
#define RST_GPIO_PORT GPIOD
#define RST_GPIO_PIN GPIO_PIN_9
#define DC_GPIO_PORT GPIOB
#define DC_GPIO_PIN GPIO_PIN_14
#define SET_ROW_CMD 0x2B
#define SET_COL_CMD 0x2A
#define SET_COLOR_CMD 0x2C
void Reset_Screen() {
HAL_GPIO_WritePin(RST_GPIO_PORT, RST_GPIO_PIN, GPIO_PIN_RESET); // pull low
HAL_Delay(10);
HAL_GPIO_WritePin(RST_GPIO_PORT, RST_GPIO_PIN, GPIO_PIN_SET); // release reset
HAL_Delay(120);
}
void Write_Rectangle(uint16_t row_lower, uint16_t row_higher, uint16_t col_lower, uint16_t col_higher, uint16_t color) {
//16 bit/pixel color order (R:5-bit, G:6-bit, B:5-bit)
//1.Set column
uint8_t col_params[4] = {(uint8_t)(col_lower >> 8), (uint8_t)(col_lower & 0x00FF),
(uint8_t)(col_higher >> 8), (uint8_t)(col_higher & 0x00FF)};
HAL_GPIO_WritePin(DC_GPIO_PORT, DC_GPIO_PIN, GPIO_PIN_RESET); //send command
uint8_t set_col_cmd[] = {SET_COL_CMD};
HAL_SPI_Transmit(&hspi2, set_col_cmd, 1, 100);
HAL_GPIO_WritePin(DC_GPIO_PORT, DC_GPIO_PIN, GPIO_PIN_SET); //send data for command
HAL_SPI_Transmit(&hspi2, col_params, 4, 100);
//2.Set row
uint8_t row_params[4] = {(uint8_t)(row_lower >> 8), (uint8_t)(row_lower & 0x00FF),
(uint8_t)(row_higher >> 8), (uint8_t)(row_higher & 0x00FF)};
uint8_t set_row_cmd[] = {SET_ROW_CMD};
HAL_GPIO_WritePin(DC_GPIO_PORT, DC_GPIO_PIN, GPIO_PIN_RESET); //send command
HAL_SPI_Transmit(&hspi2, set_row_cmd, 1, 100);
HAL_GPIO_WritePin(DC_GPIO_PORT, DC_GPIO_PIN, GPIO_PIN_SET); //send data for command
HAL_SPI_Transmit(&hspi2, row_params, 4, 100);
//3.Set color
HAL_GPIO_WritePin(DC_GPIO_PORT, DC_GPIO_PIN, GPIO_PIN_RESET); //send command
uint8_t set_color_cmd[] = {SET_COLOR_CMD};
HAL_SPI_Transmit(&hspi2, set_color_cmd, 1, 100);
HAL_GPIO_WritePin(DC_GPIO_PORT, DC_GPIO_PIN, GPIO_PIN_SET); //send data for command
// Compute rectangle size
uint32_t width = col_higher - col_lower + 1;
uint32_t height = row_higher - row_lower + 1;
uint32_t pixels = width * height;
// Send color repeatedly
//uint8_t *pix_array = malloc(pixels);
//for (int i = 0; i < ; i++) {
// pix_array[i] =
//}
uint8_t pix[2] = {(uint8_t)(color >> 8), (uint8_t)(color & 0xFF)};
//uint32_t total_bytes = pixels * 2;
//HAL_SPI_Transmit(&hspi2, pix_array, total_bytes, 1000);
//free(pix_array);
for (uint32_t i = 0; i < pixels; i++) {
HAL_SPI_Transmit(&hspi2, pix, 2, 100);
}
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_I2S3_Init();
MX_SPI1_Init();
MX_USB_HOST_Init();
MX_SPI2_Init();
/* USER CODE BEGIN 2 */
//Reset the screen
Reset_Screen();
//screen experiment, delete later (black rectangle)
Write_Rectangle(0, 10, 0, 10, 0);
//Set everything for the accelometer
uint8_t OUT_X_L = 0x28;
uint8_t OUT_X_H = 0x29;
uint8_t OUT_Y_L = 0x2A;
uint8_t OUT_Y_H = 0x2B;
uint8_t OUT_Z_L = 0x2C;
uint8_t OUT_Z_H = 0x2D;
uint8_t CTRL_REG5 = 0x24; //for sensitivity (change from default 2 to 4/8) (bits 5-4)
//receivers and transmitters
//xyz_addr[6] = {OUT_X_L, OUT_X_H, OUT_Y_L, OUT_Y_H, OUT_Z_L, OUT_Z_H};
xyz_addr[0] = OUT_X_L; xyz_addr[1] = OUT_X_H; xyz_addr[2] = OUT_Y_L; xyz_addr[3] = OUT_Y_H; xyz_addr[4] = OUT_Z_L; xyz_addr[5] = OUT_Z_H;
uint8_t ctrl_val;
//fill buffer with 0s
for (int i = 0; i < ACC_BUF_SIZE; i++) {
acc_values_buf[i] = 0;
}
//receive and set accelerator sensitivity
HAL_SPI_TransmitReceive(&hspi1, &CTRL_REG5, &ctrl_val, 1, 100);
ctrl_val = ctrl_val | 0x08; //set FSCALE0
uint8_t tx_buf[2];
tx_buf[0] = CTRL_REG5 & 0x7F; //register address
tx_buf[1] = ctrl_val; //data to write into it
HAL_SPI_Transmit(&hspi1, tx_buf, 1, 100);
//initial dma call
HAL_SPI_TransmitReceive_DMA(&hspi1, xyz_addr, xyz_data, 6);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
MX_USB_HOST_Process();
/* USER CODE BEGIN 3 */
//During each SPI clock cycle, full-duplex transmission of a single bit occurs.
//1 clock cycle is 168/32MHz = 5.25MHz
//meaning there are 5.25 * 10^6 bit, or 5.25 * 10^6/8 bytes = 656250 bytes
//or, all coordinates are received 109375 times.
}
/* USER CODE END 3 */
}I think that my initialization function may be not complete, but I don't know how to complete it.
I have commented out the main() code for non-screen functionality, however, it still does not work.
