/* RS232/TTL/RS485 communication
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* comport.c
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*
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* Created on: Feb 15, 2023
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* Author: Think
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*/
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#include "comport.h"
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#include "miscdev.h"
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//#define CONFIG_COMPORT_DEBUG
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#ifdef CONFIG_COMPORT_DEBUG
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#define com_print(format,args...) printf(format, ##args)
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#else
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#define com_print(format,args...) do{} while(0)
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#endif
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#define ARRAY_SIZE(x) sizeof(x)/sizeof(x[0])
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comport_t comports[] = {
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{.fd=-1, .devname="WiFi", .huart=&huart2 }, // ESP8266(WiFi)/ESP32(WiFi/BLE)
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{.fd=-1, .devname="RS232", .huart=&huart3 }, // RS232/TTL/MikroBUS
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{.fd=-1, .devname="RS485", .huart=&hlpuart1 }, // RS485
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};
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static inline comport_t *comport_find(UART_HandleTypeDef *huart)
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{
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comport_t *comport = NULL;
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int i;
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for(i=0; i<ARRAY_SIZE(comports); i++)
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{
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if( huart==comports[i].huart )
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{
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comport = &comports[i];
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}
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}
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return comport;
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}
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comport_t *comport_init(UART_HandleTypeDef *huart, uint8_t *rxch, uint8_t *rxbuf, size_t size)
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{
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comport_t *comport = NULL;
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if( !huart )
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return NULL;
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/* Find the corresponding comport in the array */
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comport = comport_find(huart);
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if( !comport )
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return NULL;
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comport->fd = 1;
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comport->huart = huart;
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comport->rxch = rxch;
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rb_init(&comport->rb, rxbuf, size);
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return comport;
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}
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/* +----------------------------------------+
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* | printf and interrupt receive functions |
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* +----------------------------------------+*/
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/* printf callback function on USART1 */
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int __io_putchar(int ch)
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{
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HAL_UART_Transmit(&huart1 , (uint8_t *)&ch, 1, 0xFFFF);
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return ch;
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}
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/* USART interrupt receive callback funciton */
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void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
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{
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comport_t *comport = NULL;
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uint8_t byte;
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/* Find the corresponding comport in the array */
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comport = comport_find(huart);
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if( !comport )
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{
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goto cleanup;
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}
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/* Check comport receive ring buffer */
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if( comport->fd<0 || !comport->rb.buffer || ! rb_free_size(&comport->rb) )
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{
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goto cleanup;
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}
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/* Receive and put the byte into receive ring buffer */
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HAL_UART_Receive_IT(comport->huart, comport->rxch, 1);
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rb_write(&comport->rb, comport->rxch, 1);
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return ;
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cleanup:
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HAL_UART_Receive_IT(huart, &byte, 1);
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return ;
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}
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/* +------------------------+
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* | UART/TTL API functions |
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* +------------------------+*/
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comport_t *comport_open(UART_HandleTypeDef *huart)
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{
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comport_t *comport = NULL;
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if( !huart )
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return NULL;
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/* Find the corresponding comport in the array */
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comport = comport_find(huart);
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if( comport )
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comport->fd = 1;
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return comport;
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}
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void comport_flush(comport_t *comport)
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{
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if( !comport || !comport->huart)
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return;
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if( comport->rb.buffer )
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{
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rb_clear( &comport->rb );
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}
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return;
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}
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void comport_term(comport_t *comport)
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{
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if( !comport || !comport->huart)
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return;
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comport->fd = -1;
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if( comport->rb.buffer )
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{
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rb_clear( &comport->rb );
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}
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return;
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}
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int comport_send(comport_t *comport, char *data, int bytes)
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{
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if( !comport || !data || bytes<=0 )
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return -1;
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com_print("Send %d bytes data: %s\r\n", bytes, data);
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HAL_UART_Transmit(comport->huart, (uint8_t *)data, bytes, 0xFFFF);
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return bytes;
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}
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int comport_recv(comport_t *comport, char *buf, int size, uint32_t timeout)
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{
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uint32_t tickstart = 0;
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size_t bytes = 0;
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if( !comport || !buf || size<=0 )
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return -1;
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if( !comport->rb.buffer )
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return -2;
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tickstart = HAL_GetTick();
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while((HAL_GetTick() - tickstart) < timeout)
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{
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bytes = rb_data_size(&comport->rb);
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HAL_Delay( 10 );
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/* comport received data before but not receive in 10ms now, maybe data receive over */
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if( bytes>0 && rb_data_size(&comport->rb)==bytes )
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{
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break;
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}
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}
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bytes = rb_data_size(&comport->rb);
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if( !bytes )
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{
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return 0;
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}
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bytes = bytes>size ? size : bytes;
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rb_read(&comport->rb, (uint8_t *)buf, bytes);
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com_print("Receive %d bytes data: %s\r\n", bytes, buf);
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return bytes;
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}
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/* +------------------------+
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* | RS485 API functions |
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* +------------------------+*/
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/* Direction Pin set to be high level will be send mode, and low level will be receive mode */
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#define rs485_set_dirTx() HAL_GPIO_WritePin(RS485_Dir_GPIO_Port, RS485_Dir_Pin, GPIO_PIN_SET)
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#define rs485_set_dirRx() HAL_GPIO_WritePin(RS485_Dir_GPIO_Port, RS485_Dir_Pin, GPIO_PIN_RESET)
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comport_t *rs485_open(UART_HandleTypeDef *huart)
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{
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return comport_find(huart);
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}
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void rs485_term(comport_t *comport)
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{
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return comport_term(comport);
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}
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int rs485_send(comport_t *comport, char *data, int bytes)
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{
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int rv;
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rs485_set_dirTx();
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rv = comport_send(comport, data, bytes);
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rs485_set_dirRx();
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return rv;
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}
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int rs485_recv(comport_t *comport, char *buf, int size, uint32_t timeout)
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{
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rs485_set_dirRx();
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return comport_recv(comport, buf, size, timeout);
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}
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