Add support of I2C3 on blackpill boards

Author: board707

STM32F4/cores/maple/libmaple/i2c.c

@@ -80,6 +80,27 @@ i2c_dev i2c_dev2 = {
 };
 #endif
 
+#if BOARD_NR_I2C>2
+/** I2C2 device */
+i2c_dev i2c_dev3 = {
+    .regs         = I2C3_BASE,
+#ifdef BOARD_I2C3_SDA_PIN    
+    .sda_pin      = BOARD_I2C3_SDA_PIN, 
+#else
+    .sda_pin      = PC9, 
+#endif    
+#ifdef BOARD_I2C3_SCL_PIN    
+    .scl_pin      = BOARD_I2C3_SCL_PIN, 
+#else
+    .scl_pin      = PA8,
+#endif
+    .clk_id       = RCC_I2C3,
+    .ev_nvic_line = NVIC_I2C3_EV,
+    .er_nvic_line = NVIC_I2C3_ER,
+    .state        = I2C_STATE_DISABLED
+};
+#endif
+
 static inline int32 wait_for_state_change(i2c_dev *dev,
                                           i2c_state state,
                                           uint32 timeout);
@@ -535,6 +556,11 @@ void __irq_i2c2_ev(void) {
    i2c_irq_handler(&i2c_dev2);
 }
 #endif
+#if BOARD_NR_I2C>2
+void __irq_i2c3_ev(void) {
+   i2c_irq_handler(&i2c_dev3);
+}
+#endif
 /**
  * @brief Interrupt handler for I2C error conditions
  * @param dev I2C device
@@ -564,6 +590,11 @@ void __irq_i2c2_er(void) {
     i2c_irq_error_handler(&i2c_dev2);
 }
 #endif
+#if BOARD_NR_I2C>2
+void __irq_i2c3_er(void) {
+    i2c_irq_error_handler(&i2c_dev3);
+}
+#endif
 /*
  * CCR/TRISE configuration helper
  */

STM32F4/cores/maple/libmaple/i2c.h

@@ -100,6 +100,10 @@ extern i2c_dev i2c_dev1;
 extern i2c_dev i2c_dev2;
 #define I2C2 (&i2c_dev2)
 #endif
+#if BOARD_NR_I2C>2
+extern i2c_dev i2c_dev3;
+#define I2C3 (&i2c_dev3)
+#endif
 
 /*
  * Register map base pointers
@@ -109,6 +113,8 @@ extern i2c_dev i2c_dev2;
 #define I2C1_BASE               ((struct i2c_reg_map*)0x40005400)
 /** I2C2 register map base pointer */
 #define I2C2_BASE               ((struct i2c_reg_map*)0x40005800)
+/** I2C3 register map base pointer */
+#define I2C3_BASE               ((struct i2c_reg_map*)0x40005C00)
 
 /*
  * Register bit definitions

STM32F4/libraries/Wire/Wire.cpp

@@ -67,6 +67,11 @@ TwoWire::TwoWire(uint8 dev_sel, uint8 flags) {
 	else if (dev_sel == 2) {
         sel_hard = I2C2;
     }
+#endif
+#if BOARD_NR_I2C>2
+	else if (dev_sel == 3) {
+        sel_hard = I2C3;
+    }
 #endif
 	else {
         ASSERT(1);

STM32F4/platform.txt

@@ -121,7 +121,7 @@ tools.stlink_upload.cmd=stlink_upload
 tools.stlink_upload.cmd.windows=stlink_upload.bat
 tools.stlink_upload.path.windows={runtime.hardware.path}/tools/win
 tools.stlink_upload.path.macosx={runtime.hardware.path}/tools/macosx
-tools.stlink_upload.path.linux={runtime.hardware.path}/tools/linux64
+tools.stlink_upload.path.linux={runtime.hardware.path}/tools/linux
 tools.stlink_upload.path.linux64={runtime.hardware.path}/tools/linux64
 tools.stlink_upload.upload.params.verbose=-d
 tools.stlink_upload.upload.params.quiet=
@@ -132,7 +132,7 @@ tools.hid_upload.cmd=hid_upload
 tools.hid_upload.cmd.windows=hid_upload.bat
 tools.hid_upload.path.windows={runtime.hardware.path}/tools/win
 tools.hid_upload.path.macosx={runtime.hardware.path}/tools/macosx
-tools.hid_upload.path.linux={runtime.hardware.path}/tools/linux64
+tools.hid_upload.path.linux={runtime.hardware.path}/tools/linux
 tools.hid_upload.path.linux64={runtime.hardware.path}/tools/linux64
 tools.hid_upload.upload.params.verbose=-d
 tools.hid_upload.upload.params.quiet=n

STM32F4/variants/blackpill_f401/blackpill_f401.h

@@ -52,13 +52,15 @@
 //#define BOARD_USART6_TX_PIN     PA11 // USB_DM
 //#define BOARD_USART6_RX_PIN     PA12 // USB_DP
 
-#define BOARD_NR_I2C            2
+#define BOARD_NR_I2C            3
 #define BOARD_I2C1_SCL_PIN      PB6
 #define BOARD_I2C1_SDA_PIN      PB7
 #define BOARD_I2C1A_SCL_PIN     PB8
 #define BOARD_I2C1A_SDA_PIN     PB9
-#define BOARD_I2C2_SCL_PIN     PB10
-#define BOARD_I2C2_SDA_PIN     PB3
+#define BOARD_I2C2_SCL_PIN      PB10
+#define BOARD_I2C2_SDA_PIN      PB3
+#define BOARD_I2C3_SCL_PIN      PA8
+#define BOARD_I2C3_SDA_PIN      PB4
 
 #define BOARD_NR_SPI            3
 #define BOARD_SPI1_NSS_PIN      PA4

STM32F4/variants/blackpill_f411/blackpill_f411.h

@@ -53,13 +53,15 @@
 //#define BOARD_USART6_TX_PIN     PA11 // USB_DM
 //#define BOARD_USART6_RX_PIN     PA12 // USB_DP
 
-#define BOARD_NR_I2C            2
+#define BOARD_NR_I2C            3
 #define BOARD_I2C1_SCL_PIN      PB6
 #define BOARD_I2C1_SDA_PIN      PB7
 #define BOARD_I2C1A_SCL_PIN     PB8
 #define BOARD_I2C1A_SDA_PIN     PB9
-#define BOARD_I2C2_SCL_PIN     PB10
-#define BOARD_I2C2_SDA_PIN     PB3
+#define BOARD_I2C2_SCL_PIN      PB10
+#define BOARD_I2C2_SDA_PIN      PB3
+#define BOARD_I2C3_SCL_PIN      PA8
+#define BOARD_I2C3_SDA_PIN      PB4
 
 #define BOARD_NR_SPI            3
 #define BOARD_SPI1_NSS_PIN      PA4