esp_mqtt/driver/uart.c

/******************************************************************************
 * Copyright 2013-2014 Espressif Systems (Wuxi)
 *
 * FileName: uart.c
 *
 * Description: Two UART mode configration and interrupt handler.
 *              Check your hardware connection while use this mode.
 *
 * Modification history:
 *     2014/3/12, v1.0 create this file.
*******************************************************************************/
#include "ets_sys.h"
#include "osapi.h"
#include "driver/uart.h"
#include "osapi.h"
#include "driver/uart_register.h"
#include "mem.h"
// UartDev is defined and initialized in rom code.
extern UartDevice    UartDev;

LOCAL void uart0_rx_intr_handler(void *para);

LOCAL void ICACHE_FLASH_ATTR
uart_config(uint8 uart_no)
{
  if (uart_no == UART1)
  {
    PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_U1TXD_BK);
  }
  else
  {
    /* rcv_buff size if 0x100 */
    ETS_UART_INTR_ATTACH(uart0_rx_intr_handler,  &(UartDev.rcv_buff));
    PIN_PULLUP_DIS(PERIPHS_IO_MUX_U0TXD_U);
    PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
    PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, FUNC_U0RTS);
  }

  uart_div_modify(uart_no, UART_CLK_FREQ / (UartDev.baut_rate));

  WRITE_PERI_REG(UART_CONF0(uart_no), UartDev.exist_parity
                 | UartDev.parity
                 | (UartDev.stop_bits << UART_STOP_BIT_NUM_S)
                 | (UartDev.data_bits << UART_BIT_NUM_S));

  //clear rx and tx fifo,not ready
  SET_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST | UART_TXFIFO_RST);
  CLEAR_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST | UART_TXFIFO_RST);


  if (uart_no == UART0)
  {
    //set rx fifo trigger
    WRITE_PERI_REG(UART_CONF1(uart_no),
                   ((0x7F & UART_RXFIFO_FULL_THRHD) << UART_RXFIFO_FULL_THRHD_S) |
                   //((128 & UART_RX_FLOW_THRHD) << UART_RX_FLOW_THRHD_S) |
                   //UART_RX_FLOW_EN |
                   ((0x0F & UART_TXFIFO_EMPTY_THRHD) << UART_TXFIFO_EMPTY_THRHD_S));
    //UART_RX_TOUT_EN);
    SET_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_TOUT_INT_ENA | UART_FRM_ERR_INT_ENA);
  }
  else
  {
    WRITE_PERI_REG(UART_CONF1(uart_no),
                   ((UartDev.rcv_buff.TrigLvl & UART_RXFIFO_FULL_THRHD) << UART_RXFIFO_FULL_THRHD_S));
  }

  //clear all interrupt
  WRITE_PERI_REG(UART_INT_CLR(uart_no), 0xffff);
  //enable rx_interrupt
  SET_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_FULL_INT_ENA | UART_RXFIFO_OVF_INT_ENA);
}

LOCAL STATUS
uart_tx_one_char(uint8 uart, uint8 TxChar)
{
  while (true)
  {
    uint32 fifo_cnt = READ_PERI_REG(UART_STATUS(uart)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S);
    if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) < 126) {
      break;
    }
  }
  WRITE_PERI_REG(UART_FIFO(uart) , TxChar);
  return OK;
}

void ICACHE_FLASH_ATTR
uart1_write_char(char c)
{
  if (c == '\n')
  {
    uart_tx_one_char(UART1, '\r');
    uart_tx_one_char(UART1, '\n');
  }
  else if (c == '\r')
  {
  }
  else
  {
    uart_tx_one_char(UART1, c);
  }
}

void ICACHE_FLASH_ATTR
uart0_write_char(char c)
{
  if (c == '\n')
  {
    uart_tx_one_char(UART0, '\r');
    uart_tx_one_char(UART0, '\n');
  }
  else if (c == '\r')
  {
  }
  else
  {
    uart_tx_one_char(UART0, c);
  }
}

void ICACHE_FLASH_ATTR
uart0_tx_buffer(uint8 *buf, uint16 len)
{
  uint16 i;

  for (i = 0; i < len; i++)
  {
    uart_tx_one_char(UART0, buf[i]);
  }
}

void ICACHE_FLASH_ATTR
uart0_sendStr(const char *str)
{
  while (*str)
  {
    uart_tx_one_char(UART0, *str++);
  }
}

LOCAL void
uart0_rx_intr_handler(void *para)
{
  uint8 RcvChar;
  uint8 uart_no = UART0;//UartDev.buff_uart_no;
  /* Is the frame Error interrupt set ? */
  if (UART_FRM_ERR_INT_ST == (READ_PERI_REG(UART_INT_ST(uart_no)) & UART_FRM_ERR_INT_ST))
  {
    //INFO("FRM_ERR\r\n");
    WRITE_PERI_REG(UART_INT_CLR(uart_no), UART_FRM_ERR_INT_CLR);
  }
  else if (UART_RXFIFO_FULL_INT_ST == (READ_PERI_REG(UART_INT_ST(uart_no)) & UART_RXFIFO_FULL_INT_ST)) /*fifo full*/
  {
    CLEAR_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_FULL_INT_ENA | UART_RXFIFO_TOUT_INT_ENA);
    WRITE_PERI_REG(UART_INT_CLR(UART0), UART_RXFIFO_FULL_INT_CLR);
    //INFO("Fifo full: %d\n", (READ_PERI_REG(UART_STATUS(UART0))>>UART_RXFIFO_CNT_S)&UART_RXFIFO_CNT);
    while ((READ_PERI_REG(UART_STATUS(UART0)) >> UART_RXFIFO_CNT_S)&UART_RXFIFO_CNT)
    {
      //TODO: MCU_Input( READ_PERI_REG(UART_FIFO(UART0)) & 0xFF );
    }
    WRITE_PERI_REG(UART_INT_CLR(UART0), UART_RXFIFO_FULL_INT_CLR);

    SET_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_FULL_INT_ENA | UART_RXFIFO_TOUT_INT_ENA);

  }
  else if (UART_RXFIFO_TOUT_INT_ST == (READ_PERI_REG(UART_INT_ST(uart_no)) & UART_RXFIFO_TOUT_INT_ST))
  {

    CLEAR_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_FULL_INT_ENA | UART_RXFIFO_TOUT_INT_ENA);
    WRITE_PERI_REG(UART_INT_CLR(UART0), UART_RXFIFO_TOUT_INT_CLR);
    //INFO("Fifo timeout: %d\n", (READ_PERI_REG(UART_STATUS(UART0))>>UART_RXFIFO_CNT_S)&UART_RXFIFO_CNT);
    while ((READ_PERI_REG(UART_STATUS(UART0)) >> UART_RXFIFO_CNT_S)&UART_RXFIFO_CNT)
    {
      //MCU_Input( READ_PERI_REG(UART_FIFO(UART0)) & 0xFF );
    }
    SET_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_FULL_INT_ENA | UART_RXFIFO_TOUT_INT_ENA);

  }
  else if (UART_RXFIFO_OVF_INT_ST  == (READ_PERI_REG(UART_INT_ST(uart_no)) & UART_RXFIFO_OVF_INT_ST))
  {
    //INFO("FIFO FULL\n");
    WRITE_PERI_REG(UART_INT_CLR(uart_no), UART_RXFIFO_OVF_INT_CLR);
  }
  else if (UART_TXFIFO_EMPTY_INT_ST == (READ_PERI_REG(UART_INT_ST(uart_no)) & UART_TXFIFO_EMPTY_INT_ST)) {
    //INFO("TX EMPTY\n");
    WRITE_PERI_REG(UART_INT_CLR(uart_no), UART_TXFIFO_EMPTY_INT_CLR);
    CLEAR_PERI_REG_MASK(UART_INT_ENA(UART0), UART_TXFIFO_EMPTY_INT_ENA);
  }

  ETS_UART_INTR_ENABLE();
}

void ICACHE_FLASH_ATTR
uart_init(UartBautRate uart0_br, UartBautRate uart1_br)
{
  UartDev.baut_rate = uart0_br;
  uart_config(UART0);
  UartDev.baut_rate = uart1_br;
  uart_config(UART1);
  ETS_UART_INTR_ENABLE();

  // install uart1 putc callback
  os_install_putc1((void *)uart0_write_char);
}

void ICACHE_FLASH_ATTR
uart_reattach()
{
  uart_init(BIT_RATE_115200, BIT_RATE_115200);
}