I am working on integrating the Matrix Orbital GTT43A display with my STM32 MCU. Our current display's protocol is RS232, so the code I currently have is set up for this protocol within the STM32Cube IDE.
I created generic receive and transfer buffer:
uint8_t UART1_rxBuffer[64] = { 0 };
uint8_t UART1_txBuffer[64] = { 0 };
I created generic send and receive functions:
int send_data_uart1(gtt_device* device, uint8_t* data, size_t length);
int read_data_uart1(gtt_device* device);
int send_data_uart1(gtt_device* device, uint8_t* data, size_t length){
// int i = 0;
HAL_StatusTypeDef jStatus = HAL_UART_Transmit(&huart1, data, length, 100);
if (jStatus == HAL_OK)
return length;
else
return -1; // error occured
}
int read_data_uart1(gtt_device *device){
uint8_t data;
HAL_StatusTypeDef res = HAL_UART_Receive_IT(&huart1, &data, 1);
if (res != HAL_OK) {
return -1;
}
else
return data; // no data or error occurred
}
I created a instance of the device:
gtt_device Matrix43A;
// initialtize GTT device structure and set the communication functions
Matrix43A.Context = NULL;
Matrix43A.Write = send_data_uart1; // function for writing to uART1
Matrix43A.Read = read_data_uart1; //
Matrix43A.secured_packets = 1; //1 = wrap all outgoing packets with crc protection ; 100ms timeout
Matrix43A.rx_buffer = UART1_rxBuffer;
Matrix43A.rx_buffer_size = sizeof(UART1_rxBuffer);
Matrix43A.tx_buffer = UART1_txBuffer;
Matrix43A.tx_buffer_size = sizeof(UART1_txBuffer);
I initialize and configure the proper peripherals including an interrupt for incoming information from the display:
HAL_UART_Receive_IT(&huart1, UART1_rxBuffer, 1);
I am trying to simply receive the brightness of the display using the function provided by GTTclient Library:
uint8_t test = 150;
test = gtt_get_backlight(&Matrix43A);
but keep get stuck in a loop where the packet is waiting to be completed and HAL is always busy. I can see that the correct value is in the UART1_rxBuffer[0] = 200; but never gets as far as updating the 'test' value.
