Read and write Bluetooth communication byte format

Hi Community,

​

I'm studying about the android program and stm32f407vet based controller.

​

The question I asked before is almost clear by using DMA USART.

I'm Transmit and Receive like under code.

code(IN STM32)

uint8_t rxBuffer;

int SIZE_OF_RX_TX = 1;

if (huart->Instance == USART3)

{

HAL_UART_Transmit_DMA(&huart1, rxBuffer, SIZE_OF_RX_TX);

HAL_UART_Transmit_DMA(&huart3, rxBuffer, SIZE_OF_RX_TX);

HAL_UART_Receive_DMA(&huart1, rxBuffer, SIZE_OF_RX_TX);

HAL_UART_Receive_DMA(&huart3, rxBuffer, SIZE_OF_RX_TX);

}

it means that receive USART3(BLUETOOTH) and TRANSMIT USART1 and USART3

and make a interuupt USART1 and USART3.

but in Android bluetooth only send byte array

code(in ANDROID)

void sendData(String text)

{

outputStream.write(text.getBytes("UTF-8"));

}

when I debug android program, and when I send text "1",

byte result is '49'

but when I send it to bluetooth usart3, the value sometimes broken.

and wrong value is occured.

Q.

is there a way to convert byte data USART?

How can I? I really don't know... help...