Merge pull request #27 from Dzarda7/fix/esp8266_undefined_functions

fix(esp8266): Add missing function definitions for flash and uart

Author: radimkarnis

include/esp-stub-lib/rom_wrappers.h

@@ -17,7 +17,7 @@ extern "C" {
  *
  * @param us Number of microseconds to delay.
  */
-void esp_stub_lib_delay_us(uint32_t us);
+void stub_lib_delay_us(uint32_t us);
 
 /**
  * @brief Compute little-endian CRC16 over a byte buffer.
@@ -27,27 +27,27 @@ void esp_stub_lib_delay_us(uint32_t us);
  * @param len Number of bytes to process.
  * @return Updated CRC16 value.
  */
-uint16_t esp_stub_lib_crc16_le(uint16_t crc, const uint8_t *buf, uint32_t len);
+uint16_t stub_lib_crc16_le(uint16_t crc, const uint8_t *buf, uint32_t len);
 
 /**
  * @brief Transmit a single byte over UART.
  *
  * @param c Byte to transmit.
  * @return 0 if successful, non-zero if error occurred.
  */
-uint8_t esp_stub_lib_tx_one_char(uint8_t c);
+uint8_t stub_lib_uart_tx_one_char(uint8_t c);
 
 /**
  * @brief Receive a single byte (blocking) from UART.
  *
  * @return Received byte.
  */
-uint8_t esp_stub_lib_rx_one_char(void);
+uint8_t stub_lib_uart_rx_one_char(void);
 
 /**
  * @brief Flush any buffered transmit data.
  */
-void esp_stub_lib_tx_flush(void);
+void stub_lib_uart_tx_flush(void);
 
 #ifdef __cplusplus
 }

src/rom_wrappers.c

@@ -11,27 +11,27 @@ extern uint8_t uart_tx_one_char(uint8_t ch);
 extern uint8_t uart_rx_one_char(void);
 extern void uart_tx_flush(void);
 
-void esp_stub_lib_delay_us(uint32_t us)
+void stub_lib_delay_us(uint32_t us)
 {
     ets_delay_us(us);
 }
 
-uint16_t esp_stub_lib_crc16_le(uint16_t crc, const uint8_t *buf, uint32_t len)
+uint16_t stub_lib_crc16_le(uint16_t crc, const uint8_t *buf, uint32_t len)
 {
     return crc16_le(crc, buf, len);
 }
 
-uint8_t esp_stub_lib_tx_one_char(uint8_t c)
+uint8_t stub_lib_uart_tx_one_char(uint8_t c)
 {
     return uart_tx_one_char(c);
 }
 
-uint8_t esp_stub_lib_rx_one_char(void)
+uint8_t stub_lib_uart_rx_one_char(void)
 {
     return uart_rx_one_char();
 }
 
-void esp_stub_lib_tx_flush(void)
+void stub_lib_uart_tx_flush(void)
 {
     uart_tx_flush();
 }

src/target/esp8266/CMakeLists.txt

@@ -2,6 +2,7 @@ set(srcs
     src/uart.c
     src/flash.c
     src/rom-patched.c
+    src/rom-missings.c
 )
 
 add_library(${ESP_TARGET_LIB} STATIC ${srcs})

src/target/esp8266/src/flash.c

@@ -4,7 +4,12 @@
  * SPDX-License-Identifier: Apache-2.0 OR MIT
  */
 
+#include <stdint.h>
+#include <err.h>
 #include <target/flash.h>
+#include <private/rom_flash.h>
+
+extern esp_rom_spiflash_chip_t g_rom_flashchip;
 
 void stub_target_flash_init(void *state)
 {
@@ -18,8 +23,22 @@ void stub_target_flash_deinit(const void *state)
     // TODO: Implement
 }
 
+const struct esp_rom_spiflash_chip *stub_target_flash_get_config(void)
+{
+    return &g_rom_flashchip;
+}
+
 uint32_t stub_target_flash_get_flash_id(void)
 {
     // TODO: Implement
     return 0;
 }
+
+int stub_target_flash_read_buff(uint32_t addr, void *buffer, uint32_t size)
+{
+    (void)addr;
+    (void)buffer;
+    (void)size;
+    // TODO: Implement
+    return STUB_LIB_FAIL;
+}

src/target/esp8266/src/rom-missings.c

@@ -0,0 +1,17 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ */
+#include <stdint.h>
+#include "private/soc_utils.h"
+
+void uart_tx_flush(void)
+{
+    const uint32_t UART0_STATUS_REG = 0x60000F1C;
+    const uint32_t UART_STATUS_TX_EMPTY = 0xFF << 16;
+
+    while (REG_READ(UART0_STATUS_REG) & UART_STATUS_TX_EMPTY) {
+        // wait for TX fifo to be empty, ROM code works the same way
+    }
+}