Posted on June 09, 2016 at 06:52Hi, there is my code. Rx and Tx wires are connected to ISL3176EIUZ driver.
// -----------------------------------------------------------------------------------
// copy from the hal.h and hal.c
// RS422 TXD
#define HAL_422TxPort GPIOD
#define HAL_422TxPin GPIO_PIN_5
#define HAL_422TxAf GPIO_AF7_USART2
// RS422 RXD
#define HAL_422RxPort GPIOA
#define HAL_422RxPin GPIO_PIN_3
#define HAL_422RxAf GPIO_AF7_USART2
// RS422 EnRx
#define HAL_422EnRxPort GPIOD
#define HAL_422EnRxPin GPIO_PIN_3
// RS422 EnTx
#define HAL_422EnTxPort GPIOD
#define HAL_422EnTxPin GPIO_PIN_4
// enable clocks are on the different place
// RS422_TXD
GPIO_InitStructure.Pin = HAL_422TxPin;
GPIO_InitStructure.Alternate = HAL_422TxAf;
HAL_GPIO_Init(HAL_422TxPort, &GPIO_InitStructure);
// 422_RXD
GPIO_InitStructure.Pin = HAL_422RxPin;
GPIO_InitStructure.Alternate = HAL_422RxAf;
HAL_GPIO_Init(HAL_422RxPort, &GPIO_InitStructure);
// outputs
HAL_422EnRxPort->BSRRH = HAL_422EnRxPin; // set to 0 ... enabled
HAL_422EnTxPort->BSRRH = HAL_422EnTxPin; // set to 0 ... dissabled
GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
GPIO_InitStructure.Pull = GPIO_NOPULL;
GPIO_InitStructure.Pin = HAL_422EnRxPin;
HAL_GPIO_Init(HAL_422EnRxPort, &GPIO_InitStructure);
GPIO_InitStructure.Pin = HAL_422EnTxPin;
HAL_GPIO_Init(HAL_422EnTxPort, &GPIO_InitStructure);
// -----------------------------------------------------------------------------------
USART_HandleTypeDef husart2;
/* USART2 init function */
void MX_USART2_UART_Init(void)
{
__USART2_CLK_ENABLE();
husart2.Instance = USART2;
husart2.Init.BaudRate = 921600; //2457600;
husart2.Init.WordLength = USART_WORDLENGTH_8B;
husart2.Init.StopBits = USART_STOPBITS_1;
husart2.Init.Parity = USART_PARITY_NONE;
husart2.Init.Mode = USART_MODE_TX_RX;
// huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
// huart2.Init.OverSampling = UART_OVERSAMPLING_16;
husart2.Init.CLKPhase = USART_PHASE_1EDGE;
husart2.Init.CLKPolarity = USART_POLARITY_LOW;
husart2.Init.CLKLastBit = USART_LASTBIT_DISABLE;
HAL_USART_Init(&husart2);
}
// -----------------------------------------------------------------------------------
MX_USART2_UART_Init();
HAL_422EnTxPort->BSRRL = HAL_422EnTxPin; // set to 1 ... enabled
while (1) {
if ((USART2->SR & USART_FLAG_RXNE) != 0) {
RxBuf2[0] = USART2->DR;
USART2->DR = 0xAA;
while ((USART2->SR & USART_FLAG_TXE) == 0) {osThreadYield();}
USART2->DR = RxBuf2[0];
while ((USART2->SR & USART_FLAG_TXE) == 0) {osThreadYield();}
}
//HAL_USART_Transmit(&husart2, RxBuf2, 1, 1);
//osThreadYield();
USART2->DR = 0x55;
while ((USART2->SR & USART_FLAG_TC) == 0) {osThreadYield();}
osDelay(1);
}
that's all
Jiri
