[STM32F3] Moved all F3 specific functions out of common.

lib/stm32/f3/Makefile

@@ -34,7 +34,7 @@ CFLAGS		= -Os -g \
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
 
-OBJS		= rcc.o gpio.o adc.o exti2.o i2c.o spi.o
+OBJS		= rcc.o gpio.o adc.o exti2.o i2c.o spi.o usart.o
 
 OBJS            += gpio_common_all.o gpio_common_f234.o \
 		   dac_common_all.o usart_common_all.o crc_common_all.o\

lib/stm32/f3/usart.c

@@ -31,3 +31,111 @@ LGPL License Terms @ref lgpl_license
 #include <libopencm3/stm32/usart.h>
 #include <libopencm3/stm32/common/usart_common_all.h>
 
+/*---------------------------------------------------------------------------*/
+/** @brief USART Send a Data Word.
+
+@param[in] usart unsigned 32 bit. USART block register address base @ref
+usart_reg_base
+@param[in] data unsigned 16 bit.
+*/
+
+void usart_send(uint32_t usart, uint16_t data)
+{
+	/* Send data. */
+	USART_TDR(usart) = (data & USART_TDR_MASK);
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief USART Read a Received Data Word.
+
+If parity is enabled the MSB (bit 7 or 8 depending on the word length) is the
+parity bit.
+
+@param[in] usart unsigned 32 bit. USART block register address base @ref
+usart_reg_base
+@returns unsigned 16 bit data word.
+*/
+
+uint16_t usart_recv(uint32_t usart)
+{
+	/* Receive data. */
+	return USART_RDR(usart) & USART_RDR_MASK;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief USART Wait for Transmit Data Buffer Empty
+
+Blocks until the transmit data buffer becomes empty and is ready to accept the
+next data word.
+
+@param[in] usart unsigned 32 bit. USART block register address base @ref
+usart_reg_base
+*/
+
+void usart_wait_send_ready(uint32_t usart)
+{
+	/* Wait until the data has been transferred into the shift register. */
+	while ((USART_ISR(usart) & USART_ISR_TXE) == 0);
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief USART Wait for Received Data Available
+
+Blocks until the receive data buffer holds a valid received data word.
+
+@param[in] usart unsigned 32 bit. USART block register address base @ref
+usart_reg_base
+*/
+
+void usart_wait_recv_ready(uint32_t usart)
+{
+	/* Wait until the data is ready to be received. */
+	while ((USART_ISR(usart) & USART_ISR_RXNE) == 0);
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief USART Read a Status Flag.
+
+@param[in] usart unsigned 32 bit. USART block register address base @ref
+usart_reg_base
+@param[in] flag Unsigned int32. Status register flag  @ref usart_sr_flags.
+@returns boolean: flag set.
+*/
+
+bool usart_get_flag(uint32_t usart, uint32_t flag)
+{
+	return ((USART_ISR(usart) & flag) != 0);
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief USART Return Interrupt Source.
+
+Returns true if the specified interrupt flag (IDLE, RXNE, TC, TXE or OE) was
+set and the interrupt was enabled. If the specified flag is not an interrupt
+flag, the function returns false.
+
+@todo  These are the most important interrupts likely to be used. Others
+relating to LIN break, and error conditions in multibuffer communication, need
+to be added for completeness.
+
+@param[in] usart unsigned 32 bit. USART block register address base @ref
+usart_reg_base
+@param[in] flag Unsigned int32. Status register flag  @ref usart_sr_flags.
+@returns boolean: flag and interrupt enable both set.
+*/
+
+bool usart_get_interrupt_source(uint32_t usart, uint32_t flag)
+{
+        uint32_t flag_set = (USART_ISR(usart) & flag);
+	/* IDLE, RXNE, TC, TXE interrupts */
+	if ((flag >= USART_ISR_IDLE) && (flag <= USART_ISR_TXE)) {
+		return ((flag_set & USART_CR1(usart)) != 0);
+	/* Overrun error */
+	} else if (flag == USART_ISR_ORE) {
+		return flag_set && (USART_CR3(usart) & USART_CR3_CTSIE);
+	}
+
+	return false;
+}
+
+/**@}*/