boot_serial: espressif: ESP32 serial recovery mode interface
Add the serial adapter for ESP32 for boot recovery and MCUMGR
communication.
Signed-off-by: Almir Okato <almir.okato@espressif.com>
espressif: Configure console via bootloader_support functions
Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>
diff --git a/boot/espressif/serial_adapter.c b/boot/espressif/serial_adapter.c
new file mode 100644
index 0000000..f605665
--- /dev/null
+++ b/boot/espressif/serial_adapter.c
@@ -0,0 +1,170 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <bootutil/bootutil_log.h>
+
+#include <esp_rom_uart.h>
+#include <esp_rom_gpio.h>
+#include <esp_rom_sys.h>
+#include <soc/uart_periph.h>
+#include <soc/gpio_struct.h>
+#include <hal/gpio_types.h>
+#include <hal/gpio_ll.h>
+#include <hal/uart_ll.h>
+
+#ifdef CONFIG_ESP_SERIAL_BOOT_GPIO_DETECT
+#define SERIAL_BOOT_GPIO_DETECT CONFIG_ESP_SERIAL_BOOT_GPIO_DETECT
+#else
+#define SERIAL_BOOT_GPIO_DETECT GPIO_NUM_5
+#endif
+
+#ifdef CONFIG_ESP_SERIAL_BOOT_GPIO_DETECT_VAL
+#define SERIAL_BOOT_GPIO_DETECT_VAL CONFIG_ESP_SERIAL_BOOT_GPIO_DETECT_VAL
+#else
+#define SERIAL_BOOT_GPIO_DETECT_VAL 1
+#endif
+
+#ifdef CONFIG_ESP_SERIAL_BOOT_DETECT_DELAY_S
+#define SERIAL_BOOT_DETECT_DELAY_S CONFIG_ESP_SERIAL_BOOT_DETECT_DELAY_S
+#else
+#define SERIAL_BOOT_DETECT_DELAY_S 5
+#endif
+
+#ifdef CONFIG_ESP_SERIAL_BOOT_GPIO_INPUT_TYPE
+#define SERIAL_BOOT_GPIO_INPUT_TYPE CONFIG_ESP_SERIAL_BOOT_GPIO_INPUT_TYPE
+#else
+// pull-down
+#define SERIAL_BOOT_GPIO_INPUT_TYPE 0
+#endif
+
+#ifdef CONFIG_ESP_SERIAL_BOOT_UART_NUM
+#define SERIAL_BOOT_UART_NUM CONFIG_ESP_SERIAL_BOOT_UART_NUM
+#else
+#define SERIAL_BOOT_UART_NUM ESP_ROM_UART_1
+#endif
+
+#ifdef CONFIG_ESP_SERIAL_BOOT_GPIO_RX
+#define SERIAL_BOOT_GPIO_RX CONFIG_ESP_SERIAL_BOOT_GPIO_RX
+#else
+#define SERIAL_BOOT_GPIO_RX GPIO_NUM_8
+#endif
+
+#ifdef CONFIG_ESP_SERIAL_BOOT_GPIO_TX
+#define SERIAL_BOOT_GPIO_TX CONFIG_ESP_SERIAL_BOOT_GPIO_TX
+#else
+#define SERIAL_BOOT_GPIO_TX GPIO_NUM_9
+#endif
+
+static uart_dev_t *serial_boot_uart_dev = (SERIAL_BOOT_UART_NUM == 0) ?
+ &UART0 :
+ &UART1;
+
+void console_write(const char *str, int cnt)
+{
+ uint32_t tx_len;
+
+ do {
+ tx_len = uart_ll_get_txfifo_len(serial_boot_uart_dev);
+ } while (tx_len < cnt);
+
+ uart_ll_write_txfifo(serial_boot_uart_dev, (const uint8_t *)str, cnt);
+}
+
+int console_read(char *str, int cnt, int *newline)
+{
+ volatile uint32_t len = 0;
+ volatile uint32_t read_len = 0;
+ volatile bool stop = false;
+ do {
+ len = uart_ll_get_rxfifo_len(serial_boot_uart_dev);
+
+ if (len) {
+ for (uint32_t i = 0; i < len; i++) {
+ /* Read the character from the RX FIFO */
+ uart_ll_read_rxfifo(serial_boot_uart_dev, (uint8_t *)&str[read_len], 1);
+ read_len++;
+ if (read_len == cnt || str[read_len - 1] == '\n') {
+ stop = true;
+ }
+ }
+ }
+ MCUBOOT_WATCHDOG_FEED();
+ esp_rom_delay_us(1000);
+ } while (!stop);
+
+ *newline = (str[read_len - 1] == '\n') ? 1 : 0;
+ return read_len;
+}
+
+int boot_console_init(void)
+{
+ BOOT_LOG_INF("Initializing serial boot pins");
+
+ /* Enable GPIO for UART RX */
+ esp_rom_gpio_pad_select_gpio(SERIAL_BOOT_GPIO_RX);
+ esp_rom_gpio_connect_in_signal(SERIAL_BOOT_GPIO_RX,
+ UART_PERIPH_SIGNAL(SERIAL_BOOT_UART_NUM, SOC_UART_RX_PIN_IDX),
+ 0);
+ gpio_ll_input_enable(&GPIO, SERIAL_BOOT_GPIO_RX);
+
+ /* Enable GPIO for UART TX */
+ esp_rom_gpio_pad_select_gpio(SERIAL_BOOT_GPIO_TX);
+ esp_rom_gpio_connect_out_signal(SERIAL_BOOT_GPIO_TX,
+ UART_PERIPH_SIGNAL(SERIAL_BOOT_UART_NUM, SOC_UART_TX_PIN_IDX),
+ 0, 0);
+ gpio_ll_output_enable(&GPIO, SERIAL_BOOT_GPIO_TX);
+
+ uart_ll_set_mode_normal(serial_boot_uart_dev);
+ uart_ll_set_baudrate(serial_boot_uart_dev, 115200 );
+ uart_ll_set_stop_bits(serial_boot_uart_dev, 1u );
+ uart_ll_set_parity(serial_boot_uart_dev, UART_PARITY_DISABLE );
+ uart_ll_set_rx_tout(serial_boot_uart_dev, 16 );
+
+ uart_ll_txfifo_rst(serial_boot_uart_dev);
+ uart_ll_rxfifo_rst(serial_boot_uart_dev);
+ esp_rom_delay_us(50000);
+
+ return 0;
+}
+
+bool boot_serial_detect_pin(void)
+{
+ bool detected = false;
+ int pin_value = 0;
+
+ esp_rom_gpio_pad_select_gpio(SERIAL_BOOT_GPIO_DETECT);
+ gpio_ll_input_enable(&GPIO, SERIAL_BOOT_GPIO_DETECT);
+ switch (SERIAL_BOOT_GPIO_INPUT_TYPE) {
+ // Pull-down
+ case 0:
+ gpio_ll_pulldown_en(&GPIO, SERIAL_BOOT_GPIO_DETECT);
+ break;
+ // Pull-up
+ case 1:
+ gpio_ll_pullup_en(&GPIO, SERIAL_BOOT_GPIO_DETECT);
+ break;
+ }
+ esp_rom_delay_us(50000);
+
+ pin_value = gpio_ll_get_level(&GPIO, SERIAL_BOOT_GPIO_DETECT);
+ detected = (pin_value == SERIAL_BOOT_GPIO_DETECT_VAL);
+ esp_rom_delay_us(50000);
+
+ if(detected) {
+ if(SERIAL_BOOT_DETECT_DELAY_S > 0) {
+ /* The delay time is an approximation */
+ for(int i = 0; i < (SERIAL_BOOT_DETECT_DELAY_S * 100); i++) {
+ esp_rom_delay_us(10000);
+ pin_value = gpio_ll_get_level(&GPIO, SERIAL_BOOT_GPIO_DETECT);
+ detected = (pin_value == SERIAL_BOOT_GPIO_DETECT_VAL);
+ if(!detected) {
+ break;
+ }
+ }
+ }
+ }
+ return detected;
+}