1  // Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
 2  //
 3  // Licensed under the Apache License, Version 2.0 (the "License");
 4  // you may not use this file except in compliance with the License.
 5  // You may obtain a copy of the License at
 6  //
 7  //     http://www.apache.org/licenses/LICENSE-2.0
 8  //
 9  // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  #include "soc/uart_periph.h"
16  #include "soc/gpio_periph.h"
17  #include "esp_gdbstub_common.h"
18  #include "sdkconfig.h"
19  
20  #define UART_NUM CONFIG_ESP_CONSOLE_UART_NUM
21  
22  void esp_gdbstub_target_init(void)
23  {
24  }
25  
26  int esp_gdbstub_getchar(void)
27  {
28      while (REG_GET_FIELD(UART_STATUS_REG(UART_NUM), UART_RXFIFO_CNT) == 0) {
29          ;
30      }
31      return REG_READ(UART_FIFO_REG(UART_NUM));
32  }
33  
34  void esp_gdbstub_putchar(int c)
35  {
36      while (REG_GET_FIELD(UART_STATUS_REG(UART_NUM), UART_TXFIFO_CNT) >= 126) {
37          ;
38      }
39      REG_WRITE(UART_FIFO_REG(UART_NUM), c);
40  }
41  
42  int esp_gdbstub_readmem(intptr_t addr)
43  {
44      if (addr < 0x20000000 || addr >= 0x80000000) {
45          /* see cpu_configure_region_protection */
46          return -1;
47      }
48      uint32_t val_aligned = *(uint32_t *)(addr & (~3));
49      uint32_t shift = (addr & 3) * 8;
50      return (val_aligned >> shift) & 0xff;
51  }