esp_gdbstub: refactor code

components/esp_gdbstub/src/gdbstub_transport.c

@@ -0,0 +1,119 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "esp_gdbstub.h"
+#include "esp_gdbstub_common.h"
+#include "sdkconfig.h"
+#if CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG
+#include "hal/usb_serial_jtag_ll.h"
+#else
+#include "hal/uart_ll.h"
+#endif
+
+#if CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG
+
+int esp_gdbstub_getchar()
+{
+    uint8_t c;
+    // retry the read until we succeed
+    while (usb_serial_jtag_ll_read_rxfifo(&c, 1) == 0) {
+        ;
+    }
+    return c;
+}
+
+void esp_gdbstub_putchar(int c)
+{
+    uint8_t cc = c;
+    // retry the write until we succeed
+    while (usb_serial_jtag_ll_write_txfifo(&cc, 1) < 1) {
+        ;
+    }
+}
+
+void esp_gdbstub_flush(void)
+{
+    usb_serial_jtag_ll_txfifo_flush();
+}
+
+
+#else // CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG
+
+static uart_dev_t *gdb_uart = NULL;
+
+static inline void esp_gdbstub_uart_init(void)
+{
+    if (gdb_uart != NULL) {
+        return;
+    }
+    switch (CONFIG_ESP_CONSOLE_UART_NUM) {
+    case 0:
+        gdb_uart = &UART0;
+        break;
+#if CONFIG_SOC_UART_NUM > 1
+    case 1:
+        gdb_uart = &UART1;
+        break;
+#endif
+#if CONFIG_SOC_UART_NUM > 2
+    case 2:
+        gdb_uart = &UART2;
+        break;
+#endif
+    default:
+        gdb_uart = &UART0;
+        break;
+    }
+}
+
+int esp_gdbstub_getchar(void)
+{
+    esp_gdbstub_uart_init();
+    unsigned char data;
+    while (uart_ll_get_rxfifo_len(gdb_uart) == 0) {
+        ;
+    }
+    uart_ll_read_rxfifo(gdb_uart, &data, 1);
+    return data;
+}
+
+void esp_gdbstub_putchar(int c)
+{
+    esp_gdbstub_uart_init();
+    while (uart_ll_get_txfifo_len(gdb_uart) <= 126) {
+        ;
+    }
+    uart_ll_write_txfifo(gdb_uart, (uint8_t *)&c, 1);
+}
+
+void esp_gdbstub_flush(void)
+{
+    esp_gdbstub_uart_init();
+    // wait until some data in transmition
+    while (false == uart_ll_is_tx_idle(gdb_uart)) {
+        ;
+    }
+}
+
+int esp_gdbstub_getfifo(void)
+{
+    esp_gdbstub_uart_init();
+    int doDebug = 0;
+
+    int fifolen = uart_ll_get_rxfifo_len(gdb_uart);
+    while (fifolen != 0) {
+        unsigned char data;
+        uart_ll_read_rxfifo(gdb_uart, &data, 1);
+        if (data == 0x3) {
+            doDebug = 1; // Check if any of the chars is Ctrl+C. Throw away rest.
+        }
+        fifolen--;
+    }
+    uart_ll_clr_intsts_mask(gdb_uart, UART_INTR_RXFIFO_FULL | UART_INTR_RXFIFO_TOUT);
+    return doDebug;
+}
+
+#endif // CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG