Add peripheral definitions

ports/stm32f4/common-hal/busio/UART.c

@@ -41,7 +41,28 @@ void common_hal_busio_uart_construct(busio_uart_obj_t *self,
         const mcu_pin_obj_t * tx, const mcu_pin_obj_t * rx, uint32_t baudrate,
         uint8_t bits, uart_parity_t parity, uint8_t stop, mp_float_t timeout,
         uint16_t receiver_buffer_size) {
-	mp_raise_NotImplementedError(translate("UART not yet supported"));
+
+    GPIO_InitStruct.Pin = pin_mask(10)|pin_mask(11);
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF7_USART3;
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+    __HAL_RCC_USART2_CLK_ENABLE();
+
+    huart2.Instance = USART2;
+    huart2.Init.BaudRate = 115200;
+    huart2.Init.WordLength = UART_WORDLENGTH_8B;
+    huart2.Init.StopBits = UART_STOPBITS_1;
+    huart2.Init.Parity = UART_PARITY_NONE;
+    huart2.Init.Mode = UART_MODE_TX_RX;
+    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+    huart2.Init.OverSampling = UART_OVERSAMPLING_16;
+    if (HAL_UART_Init(&huart2) != HAL_OK)
+    {
+        mp_raise_NotImplementedError(translate("UART explode"));
+    }
 }
 
 bool common_hal_busio_uart_deinited(busio_uart_obj_t *self) {

ports/stm32f4/common-hal/busio/UART.h

@@ -33,8 +33,8 @@
 
 typedef struct {
     mp_obj_base_t base;
-    uint8_t rx_pin;
+    const mcu_uart_tx_obj_t *tx;
-    uint8_t tx_pin;
+    const mcu_uart_rx_obj_t *rx;
     uint8_t character_bits;
     bool rx_error;
     uint32_t baudrate;

ports/stm32f4/peripherals/stm32f4/periph.h

@@ -99,7 +99,28 @@ typedef struct {
     .pin = spi_pin, \
 }
 
-// TODO: SPI, UART, etc
+// UART
+// TODO: these objects should be condensed into a single 'periph_pin' unless we
+// find a compelling reason to store more unique data in them. 
+
+typedef struct {
+    uint8_t uart_index:4; 
+    uint8_t altfn_index:4; 
+    const mcu_pin_obj_t * pin;
+} mcu_uart_tx_obj_t;
+
+typedef struct {
+    uint8_t uart_index:4; 
+    uint8_t altfn_index:4; 
+    const mcu_pin_obj_t * pin;
+} mcu_uart_rx_obj_t;
+
+#define UART(index, alt, uart_pin)       \
+{ \
+    .uart_index = index, \
+    .altfn_index = alt, \
+    .pin = uart_pin, \
+}
 
 // Choose based on chip
 #ifdef STM32F412Zx

ports/stm32f4/peripherals/stm32f4/stm32f405xx/periph.c

@@ -85,4 +85,38 @@ const mcu_spi_nss_obj_t mcu_spi_nss_list[6] = {
     SPI(3, 6, &pin_PA04),
     SPI(3, 6, &pin_PA15),
 };
+
+USART_TypeDef * mcu_uart_banks[6] = {USART1, USART2, USART3, UART4, UART5, USART6};
+bool mcu_uart_has_usart[6] = {true, true, true, false, false, true};
+
+const mcu_uart_tx_obj_t mcu_uart_tx_list[12] = {
+    UART(4, 8, &pin_PA00),
+    UART(2, 7, &pin_PA02),
+    UART(1, 7, &pin_PA09),
+    UART(1, 7, &pin_PB06),
+    UART(3, 7, &pin_PB10),
+    UART(6, 8, &pin_PC06),
+    UART(3, 7, &pin_PC10),
+    UART(4, 8, &pin_PC10),
+    UART(5, 8, &pin_PC12),
+    UART(2, 7, &pin_PD05),
+    UART(3, 7, &pin_PD08),
+    UART(6, 8, &pin_PG14),
+};
+
+const mcu_uart_rx_obj_t mcu_uart_rx_list[12] = {
+    UART(4, 8, &pin_PA01),
+    UART(2, 7, &pin_PA03),
+    UART(1, 7, &pin_PA10),
+    UART(1, 7, &pin_PB07),
+    UART(3, 7, &pin_PB11),
+    UART(6, 8, &pin_PC07),
+    UART(3, 7, &pin_PC11),
+    UART(4, 8, &pin_PC11),
+    UART(5, 8, &pin_PD02),
+    UART(2, 7, &pin_PD06),
+    UART(3, 7, &pin_PD09),
+    UART(6, 8, &pin_PG09),
+};
+
 //UART, Etc

ports/stm32f4/peripherals/stm32f4/stm32f405xx/periph.h

@@ -41,5 +41,12 @@ extern const mcu_spi_mosi_obj_t mcu_spi_mosi_list[6];
 extern const mcu_spi_miso_obj_t mcu_spi_miso_list[6];
 extern const mcu_spi_nss_obj_t mcu_spi_nss_list[6];
 
+//UART
+extern USART_TypeDef * mcu_uart_banks[6];
+bool mcu_uart_has_usart[6]
+
+extern const mcu_uart_tx_obj_t mcu_uart_tx_list[12];
+extern const mcu_uart_rx_obj_t mcu_uart_rx_list[12];
+
 
 #endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F405XX_PERIPH_H