blackpill-f4: Speed up bus turnaround like on other platforms

blackmagic-debug · Nov 27, 2023 · 5fa711e · 5fa711e
1 parent 39cb6d6
commit 5fa711e
Showing 1 changed file with 35 additions and 4 deletions.
diff --git a/src/platforms/common/blackpill-f4/blackpill-f4.h b/src/platforms/common/blackpill-f4/blackpill-f4.h
@@ -115,6 +115,41 @@
 #define SWDIO_PORT TMS_PORT
 #define SWDIO_PIN  TMS_PIN
 
+#if 0
+#define TMS_SET_MODE()     gpio_mode_setup(TMS_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, TMS_PIN);
+#define SWDIO_MODE_FLOAT() gpio_mode_setup(SWDIO_PORT, GPIO_MODE_INPUT, GPIO_PUPD_NONE, SWDIO_PIN);
+
+#define SWDIO_MODE_DRIVE() gpio_mode_setup(SWDIO_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, SWDIO_PIN);
+
+#else
+
+#define SWDIO_MODE_REG_MULT_PB9 (1 << (9 << 1))
+#define SWDIO_MODE_REG_MULT_PB8 (1 << (8 << 1))
+/* Update when adding more alternative pinouts */
+#define SWDIO_MODE_REG_MULT PINOUT_SWITCH(SWDIO_MODE_REG_MULT_PB9, SWDIO_MODE_REG_MULT_PB8)
+#define SWDIO_MODE_REG      GPIO_MODER(TMS_PORT)
+
+#define TMS_SET_MODE()                                                    \
+	gpio_mode_setup(TMS_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, TMS_PIN); \
+	gpio_set_output_options(TMS_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, TMS_PIN);
+
+/* Perform SWDIO bus turnaround faster than a gpio_mode_setup() call */
+#define SWDIO_MODE_FLOAT()                        \
+	do {                                          \
+		uint32_t mode_reg = SWDIO_MODE_REG;       \
+		mode_reg &= ~(0x3 * SWDIO_MODE_REG_MULT); \
+		SWDIO_MODE_REG = mode_reg;                \
+	} while (0)
+
+#define SWDIO_MODE_DRIVE()                     \
+	do {                                       \
+		uint32_t mode_reg = SWDIO_MODE_REG;    \
+		mode_reg |= (1 * SWDIO_MODE_REG_MULT); \
+		SWDIO_MODE_REG = mode_reg;             \
+	} while (0)
+
+#endif
+
 #define TRST_PORT PINOUT_SWITCH(GPIOA, GPIOB)
 #define TRST_PIN  PINOUT_SWITCH(GPIO6, GPIO3)
 
@@ -221,10 +256,6 @@
 #define BOOTMAGIC0 UINT32_C(0xb007da7a)
 #define BOOTMAGIC1 UINT32_C(0xbaadfeed)
 
-#define TMS_SET_MODE()     gpio_mode_setup(TMS_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, TMS_PIN);
-#define SWDIO_MODE_FLOAT() gpio_mode_setup(SWDIO_PORT, GPIO_MODE_INPUT, GPIO_PUPD_NONE, SWDIO_PIN);
-
-#define SWDIO_MODE_DRIVE() gpio_mode_setup(SWDIO_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, SWDIO_PIN);
 #define UART_PIN_SETUP()                                                                            \
 	do {                                                                                            \
 		gpio_mode_setup(USBUSART_PORT, GPIO_MODE_AF, GPIO_PUPD_NONE, USBUSART_TX_PIN);              \