first commit

Example/EpaperModuleTest_GD32F303/Src/usart.c

@@ -0,0 +1,45 @@
+#include "usart.h"
+
+/* for MicroLIB */
+int fputc(int ch, FILE *f)
+{
+  /* Place your implementation of fputc here */
+  /* e.g. write a character to the USART3 and Loop until the end of transmission */
+	usart_data_transmit(USART0, (uint8_t)ch);
+	while(RESET == usart_flag_get(USART0, USART_FLAG_TBE));
+	return ch;
+}
+
+/* for GNU */
+int _write (int fd, char *pBuffer, int size)
+{ 
+	for (int i = 0; i < size; i++)
+	{
+		usart_data_transmit(USART0, (uint8_t)pBuffer[i]);
+	  while(RESET == usart_flag_get(USART0, USART_FLAG_TBE));
+	}
+	return size;
+}
+
+void usart0_config(void)
+{
+		/* enable GPIO clock */
+    rcu_periph_clock_enable(RCU_GPIOA);
+
+    /* enable USART clock */
+    rcu_periph_clock_enable(RCU_USART0);
+
+    /* connect port to USARTx_Tx */
+    gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9);
+
+    /* connect port to USARTx_Rx */
+    gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_10);
+
+    /* USART configure */
+    usart_deinit(USART0);
+    usart_baudrate_set(USART0, 115200U);
+    usart_receive_config(USART0, USART_RECEIVE_ENABLE);
+    usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
+    usart_enable(USART0);
+}
+