Implement a test mode for F7 (v3, Lightning Plus) and AT32F4xx models.

inc/cdc_acm_protocol.h

@@ -70,7 +70,10 @@
 /* CMD_GET_PIN, length=3, pin#. Successful ACK is followed by pin-level byte
  * (1=High, 0=Low). Unsupported pin returns ACK_BAD_PIN and no pin level. */
 #define CMD_GET_PIN        20
-#define CMD_MAX            20
+/* CMD_TEST_MODE, length=10, 0x6e504b4e, 0x382910d3 
+ * Responds ACK_OKAY and then switches to board test mode until reset. */
+#define CMD_TEST_MODE      21
+#define CMD_MAX            21
 
 
 /*

inc/mcu/stm32/common.h

@@ -92,6 +92,21 @@ void fpec_init(void);
 void fpec_page_erase(uint32_t flash_address);
 void fpec_write(const void *data, unsigned int size, uint32_t flash_address);
 
+/* Pin mappings */
+enum { _A = 0, _B, _C, _D, _E, _F, _G, _H, _I };
+enum { _OD = 0, _PP };
+struct pin_mapping {
+    uint8_t pin_id;
+    uint8_t gpio_bank;
+    uint8_t gpio_pin;
+    bool_t  push_pull;
+};
+GPIO gpio_from_id(uint8_t id);
+uint8_t write_mapped_pin(
+    const struct pin_mapping *map, int pin_id, bool_t level);
+uint8_t read_mapped_pin(
+    const struct pin_mapping *map, int pin_id, bool_t *p_level);
+
 /*
  * Local variables:
  * mode: C

inc/mcu/stm32/f7.h

@@ -99,13 +99,6 @@ enum {
     F7SM_v3,
 };
 
-struct pin_mapping {
-    uint8_t pin_id;
-    uint8_t gpio_bank;
-    uint8_t gpio_pin;
-    bool_t  push_pull;
-};
-
 struct board_config {
     uint8_t hse_mhz;
     bool_t hse_byp;
@@ -118,10 +111,6 @@ struct board_config {
 extern const struct board_config *board_config;
 void identify_board_config(void);
 
-GPIO gpio_from_id(uint8_t id);
-uint8_t write_mapped_pin(
-    const struct pin_mapping *map, int pin_id, bool_t level);
-
 void early_fatal(int blinks) __attribute__((noreturn));
 #define early_delay_ms(ms) (delay_ticks((ms)*2000))
 #define early_delay_us(us) (delay_ticks((us)*2))

inc/util.h

@@ -103,6 +103,9 @@ static inline int printk(const char *format, ...) { return 0; }
 void floppy_init(void);
 void floppy_process(void);
 
+/* Test mode */
+void testmode_process(void);
+
 /* CRC-CCITT */
 uint16_t crc16_ccitt(const void *buf, size_t len, uint16_t crc);