Posted on November 11, 2015 at 11:44Hello,
I am using STM32L053R6 interfaced to Blue NRG chip. I am accessing the blue NRG through VCOM.
I have connected a USB to UART converter to a PC and was trasmitting the VCOM data over this. It worked!!!
Now, I want to do the same in half duplex mode. I have designed a circuit for the USB to UART converter so that it acts as a single wire UART. It seems to work as I can see the data being sent to STM32.
But however, there is no response from the controller. I doubt even if it is reading this data.
Can you please check if my half duplex configuartion is right?
GPIO_InitTypeDef GPIO_InitStruct;
/*♯♯-1- Enable peripherals and GPIO Clocks ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
/* Enable GPIO TX/RX clock */
USARTx_TX_GPIO_CLK_ENABLE();
USARTx_RX_GPIO_CLK_ENABLE();
/* Enable USART1 clock */
USARTx_CLK_ENABLE();
/*♯♯-2- Configure peripheral GPIO ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
/* UART TX GPIO pin configuration */
GPIO_InitStruct.Pin = USARTx_TX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Alternate = USARTx_TX_AF;
HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);
GPIO_InitStruct.Pin = USARTx_RX_PIN;
GPIO_InitStruct.Alternate = USARTx_RX_AF;
HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct);
And then,
UartHandle.Instance = USARTx;
UartHandle.Init.BaudRate = 9600;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
if(HAL_UART_Init(&UartHandle) != HAL_OK)
{
// Initialization Error
Error_Handler();
}
if(HAL_HalfDuplex_Init(&UartHandle) != HAL_OK)
{
Error_Handler();
}
#nucleo #half-duplex-usart #bluenrg
