NUCLEO_L476RG : minor serial pin update

SERIAL_TX and SERIAL_RX pins used for debug printf cannot be set as available

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L476xG/TARGET_NUCLEO_L476RG/PeripheralPins.c

@@ -41,8 +41,8 @@
 const PinMap PinMap_ADC[] = {
     {PA_0,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0,  5, 0)}, // IN5 - ARDUINO A0
     {PA_1,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0,  6, 0)}, // IN6 - ARDUINO A1
-    {PA_2,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0,  7, 0)}, // IN7
-    {PA_3,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0,  8, 0)}, // IN8
+//  {PA_2,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0,  7, 0)}, // IN7 // PA_2 is used as SERIAL_TX
+//  {PA_3,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0,  8, 0)}, // IN8 // PA_3 is used as SERIAL_RX
     {PA_4,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0,  9, 0)}, // IN9 - ARDUINO A2
     {PA_5,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0, 10, 0)}, // IN10
     {PA_6,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG_ADC_CONTROL, GPIO_NOPULL, 0, 11, 0)}, // IN11
@@ -98,10 +98,10 @@ const PinMap PinMap_PWM[] = {
     {PA_1,  PWM_2,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 2, 0)},  // TIM2_CH2
 //  {PA_1,  PWM_5,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 2, 0)},  // TIM5_CH2 (used by us_ticker)
 //  {PA_1,  PWM_15, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF14_TIM15, 1, 1)},// TIM15_CH1N
-    {PA_2,  PWM_2,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 3, 0)},  // TIM2_CH3
+//  {PA_2,  PWM_2,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 3, 0)},  // TIM2_CH3 // PA_2 is used as SERIAL_TX
 //  {PA_2,  PWM_5,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 3, 0)},  // TIM5_CH3 (used by us_ticker)
 //  {PA_2,  PWM_15, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF14_TIM15, 1, 0)},// TIM15_CH1
-    {PA_3,  PWM_2,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 4, 0)},  // TIM2_CH4
+//  {PA_3,  PWM_2,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 4, 0)},  // TIM2_CH4 // PA_3 is used as SERIAL_RX
 //  {PA_3,  PWM_5,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 4, 0)},  // TIM5_CH4 (used by us_ticker)
 //  {PA_3,  PWM_15, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF14_TIM15, 2, 0)},// TIM15_CH2
     {PA_5,  PWM_2,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)},  // TIM2_CH1
@@ -159,11 +159,11 @@ const PinMap PinMap_PWM[] = {
 
 const PinMap PinMap_UART_TX[] = {
     {PA_0,  UART_4, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART4)},
-    {PA_2,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+    {PA_2,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)}, // SERIAL_TX
     {PA_9,  UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
     {PB_6,  UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
     {PB_10, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},
-//  {PB_11, LPUART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_LPUART1)}, // Already used by UART_RX
+    {PB_11, LPUART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_LPUART1)},
     {PC_1,  LPUART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_LPUART1)},
     {PC_4,  UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},
     {PC_10, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},
@@ -174,10 +174,10 @@ const PinMap PinMap_UART_TX[] = {
 
 const PinMap PinMap_UART_RX[] = {
     {PA_1,  UART_4, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART4)},
-    {PA_3,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+    {PA_3,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)}, // SERIAL_RX
     {PA_10, UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
     {PB_7,  UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
-//  {PB_10, LPUART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_LPUART1)}, // Already used by UART_TX
+    {PB_10, LPUART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_LPUART1)},
     {PB_11, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},
     {PC_0,  LPUART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_LPUART1)},
     {PC_5,  UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},