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uart.c
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Created
Mon, Aug 19, 11:22
Size
3 KB
Mime Type
text/x-c
Expires
Wed, Aug 21, 11:22 (1 d, 21 h)
Engine
blob
Format
Raw Data
Handle
20014866
Attached To
R2671 HHRI-software
uart.c
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#include "uart.h"
uart_rxByteHandlerFunc
uart_rxHandler
;
/**
* @brief Initialize the UART module.
* @param f: a pointer to the function to be called each time a byte arrives.
*/
void
uart_Init
(
uart_rxByteHandlerFunc
f
)
{
GPIO_InitTypeDef
GPIO_InitStruct
;
USART_InitTypeDef
USART_InitStruct
;
NVIC_InitTypeDef
NVIC_InitStruct
;
// Periph clock enable
RCC_APB1PeriphClockCmd
(
RCC_APB1Periph_USART2
,
ENABLE
);
// GPIO (PC10 & PC11)
GPIO_InitStruct
.
GPIO_Pin
=
USART_TX_Pin
;
GPIO_InitStruct
.
GPIO_Mode
=
GPIO_Mode_AF
;
GPIO_InitStruct
.
GPIO_Speed
=
GPIO_Speed_50MHz
;
GPIO_InitStruct
.
GPIO_OType
=
GPIO_OType_PP
;
GPIO_InitStruct
.
GPIO_PuPd
=
GPIO_PuPd_UP
;
GPIO_Init
(
USART_TX_Port
,
&
GPIO_InitStruct
);
GPIO_PinAFConfig
(
USART_TX_Port
,
USART_TX_PinSource
,
GPIO_AF_USART2
);
GPIO_InitStruct
.
GPIO_Pin
=
USART_RX_Pin
;
GPIO_Init
(
USART_RX_Port
,
&
GPIO_InitStruct
);
GPIO_PinAFConfig
(
USART_RX_Port
,
USART_RX_PinSource
,
GPIO_AF_USART2
);
// UART config
USART_InitStruct
.
USART_BaudRate
=
USART_BAUDRATE
;
USART_InitStruct
.
USART_WordLength
=
USART_WordLength_8b
;
USART_InitStruct
.
USART_StopBits
=
USART_StopBits_1
;
// 1 stop bit (standard)
USART_InitStruct
.
USART_Parity
=
USART_Parity_No
;
USART_InitStruct
.
USART_HardwareFlowControl
=
USART_HardwareFlowControl_None
;
USART_InitStruct
.
USART_Mode
=
USART_Mode_Tx
|
USART_Mode_Rx
;
//Two way datas
USART_Init
(
USART2
,
&
USART_InitStruct
);
// USART Rx interrupt
USART_ITConfig
(
USART2
,
USART_IT_RXNE
,
ENABLE
);
NVIC_InitStruct
.
NVIC_IRQChannel
=
USART2_IRQn
;
NVIC_InitStruct
.
NVIC_IRQChannelPreemptionPriority
=
UART_RX_IRQ_PRIORIY
;
NVIC_InitStruct
.
NVIC_IRQChannelSubPriority
=
0
;
NVIC_InitStruct
.
NVIC_IRQChannelCmd
=
ENABLE
;
NVIC_Init
(
&
NVIC_InitStruct
);
USART_Cmd
(
USART2
,
ENABLE
);
// Function called when a byte arrives, to process it.
uart_rxHandler
=
f
;
}
/**
* @brief Get the received byte, and send it to the specified RX handler.
* @note Called by the received byte interrupt.
*/
void
USART2_IRQHandler
(
void
)
{
if
(
USART_GetITStatus
(
USART2
,
USART_IT_RXNE
))
{
uint8_t
rxData
=
USART2
->
DR
;
// Read the DataRegister (also clears the RX interrupt pending bit).
// Call the external RX byte handler.
uart_rxHandler
(
rxData
);
}
}
/**
* @brief Sent a byte through UART.
* @param data: byte to send through UART.
* @note This function blocks until the byte is sent.
*/
void
uart_SendByte
(
uint8_t
data
)
{
while
(
!
(
USART_PC_COMM
->
SR
&
0x00000040
)
)
// Wait until data register is empty.
;
USART_SendData
(
USART_PC_COMM
,
data
);
}
/**
* @brief Sent an array of bytes through UART.
* @note This function blocks until all the bytes are sent.
* @param data: bytes array to send through UART.
* @param length: number of bytes in the array.
*/
void
uart_SendBytes
(
uint8_t
*
data
,
int
length
)
{
int
i
;
for
(
i
=
0
;
i
<
length
;
i
++
)
uart_SendByte
(
data
[
i
]);
}
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