Add support for hardwire I2C2 on blackpill F401

Author: board707

STM32F4/cores/maple/libmaple/gpio_def.h

@@ -243,6 +243,7 @@ typedef enum {
     GPIO_AFMODE_USART4_6 = 8,
     GPIO_AFMODE_CAN1_2   = 9,
     GPIO_AFMODE_TIM12_14 = 9,
+    GPIO_AFMODE_I2C2_3   = 9,
     GPIO_AFMODE_OTG_FS   = 10,
     GPIO_AFMODE_ETH      = 11,
     GPIO_AFMODE_FSMC     = 12,

STM32F4/cores/maple/libmaple/i2c.c

@@ -55,8 +55,10 @@ i2c_dev i2c_dev1 = {
 /** I2C2 device */
 i2c_dev i2c_dev2 = {
     .regs         = I2C2_BASE,
-    .sda_pin      = PB11,
-    .scl_pin      = PB10,
+   // .sda_pin      = PB3,
+    //.scl_pin      = PB10,
+    .sda_pin      = BOARD_I2C2_SDA_PIN,
+    .scl_pin      = BOARD_I2C2_SCL_PIN,
     .clk_id       = RCC_I2C2,
     .ev_nvic_line = NVIC_I2C2_EV,
     .er_nvic_line = NVIC_I2C2_ER,
@@ -206,7 +208,13 @@ void i2c_master_enable(i2c_dev *dev, uint32 flags) {
     delay_us(2);
     gpio_set_af_mode(dev->scl_pin, GPIO_AFMODE_I2C1_3);
     delay_us(2);
-    gpio_set_af_mode(dev->sda_pin, GPIO_AFMODE_I2C1_3);
+    if ((dev->sda_pin == PB3) || (dev->sda_pin == PB4)) {
+        gpio_set_af_mode(dev->sda_pin, GPIO_AFMODE_I2C2_3);
+    }
+    else {
+        gpio_set_af_mode(dev->sda_pin, GPIO_AFMODE_I2C1_3);
+    }
+   
 
     i2c_init(dev);
 

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/linux
+tools.stlink_upload.path.linux={runtime.hardware.path}/tools/linux64
 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/linux
+tools.hid_upload.path.linux={runtime.hardware.path}/tools/linux64
 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

@@ -52,11 +52,11 @@
 //#define BOARD_USART6_TX_PIN     PA11 // USB_DM
 //#define BOARD_USART6_RX_PIN     PA12 // USB_DP
 
-#define BOARD_NR_I2C            1
+#define BOARD_NR_I2C            2
 #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_NR_SPI            3
 #define BOARD_SPI1_NSS_PIN      PA4