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NUCLEO-STM32G0B1RE USART2 with CTS/RTS can NOT communicate with U-blox GSM module LARA-6004D?
Dear Sir,
I have a NUCLEO-STM32G0B1RE board. I configure USART2 with CTS and RTS try to communicate with u-blox GSM module LARA-6004D, but fails. No data received.
Is there any missing? Any comment are welcome, thanks.
hardware connection is
MCU TXD <-> GSM RXD
MCU RXD <-> GSM TXD
MCU CTS <-> GSM RTS
MCU RTS <-> GSM CTS
IOC config about USRAT2 are as fillows,
32:Mcu.IP4=USART2
65:NVIC.USART2_LPUART2_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
93:PD3.Signal=USART2_CTS
96:PD4.Signal=USART2_RTS
98:PD5.GPIO_Label=USART2_TX [STLK_TX]
101:PD5.Signal=USART2_TX
103:PD6.GPIO_Label=USART2_RX [STLK_RX]
106:PD6.Signal=USART2_RX
149:ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_DMA_Init-DMA-false-HAL-true,4-MX_USART2_UART_Init-USART2-false-HAL-true,5-MX_USART3_UART_Init-USART3-false-HAL-true
168:RCC.IPParameters=ADCFreq_Value,AHBFreq_Value,APBFreq_Value,APBTimFreq_Value,CECFreq_Value,CortexFreq_Value,EXTERNAL_CLOCK_VALUE,FCLKCortexFreq_Value,FDCANFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI48_VALUE,HSI_VALUE,I2C1Freq_Value,I2C2Freq_Value,I2S1Freq_Value,I2S2Freq_Value,LPTIM1Freq_Value,LPTIM2Freq_Value,LPUART1Freq_Value,LPUART2Freq_Value,LSCOPinFreq_Value,LSI_VALUE,MCO1PinFreq_Value,MCO2PinFreq_Value,PLLPoutputFreq_Value,PLLQoutputFreq_Value,PLLRCLKFreq_Value,PWRFreq_Value,SYSCLKFreq_VALUE,SYSCLKSource,TIM15Freq_Value,TIM1Freq_Value,USART1Freq_Value,USART2Freq_Value,USART3Freq_Value,USBFreq_Value,VCOInputFreq_Value,VCOOutputFreq_Value
186:RCC.USART2Freq_Value=64000000
191:USART2.IPParameters=VirtualMode-Asynchronous
192:USART2.VirtualMode-Asynchronous=VM_ASYNC
Code snippet are
#define RX_BUFFER_SIZE 128
typedef struct {
uint8_t buffer[RX_BUFFER_SIZE];
size_t head;
size_t tail;
} RingBuffer;
UART_HandleTypeDef huart2;
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
if (huart->Instance == USART2)
{
/* Get the received character */
uint8_t data = huart2.Instance->RDR;
/* Add the data to the ring buffer */
rx_buffer.buffer[rx_buffer.head] = data;
rx_buffer.head = (rx_buffer.head + 1) % RX_BUFFER_SIZE;
/* Restart the interrupt-driven reception for the next byte */
HAL_UART_Receive_IT(&huart2, &rx_buffer.buffer[rx_buffer.head], 1);
}
}
/* 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_USART2_UART_Init();
MX_USART3_UART_Init();
/* USER CODE BEGIN 2 */
HAL_UART_Receive_IT(&huart2, (uint8_t*)rx_buffer.buffer, 1);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if (i % 1000 == 0) {
HAL_UART_Transmit_IT(&huart2, "AT", 2);
}
i++;
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}