library for USART communication (code)
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library for USART communication (code)
- Author
- King Kévin kingk.nosp@m.evin.nosp@m.@cuvo.nosp@m.odoo.nosp@m..info
- Date
- 2016
- Note
- peripherals used: USART USART peripheral used for UART communication
Definition in file usart.c.
#define USART_BAUDRATE 115200 |
serial baudrate, in bits per second (with 8N1 8 bits, no parity bit, 1 stop bit settings)
Definition at line 49 of file usart.c.
void usart_flush |
( |
void |
| ) |
|
ensure all data has been transmitted (blocking)
- Note
- block until all data has been transmitted
Definition at line 95 of file usart.c.
char usart_getchar |
( |
void |
| ) |
|
get character received over USART (blocking)
- Returns
- character received over USART
- Note
- blocks until character is received over USART when received buffer is empty
Definition at line 103 of file usart.c.
void usart_putchar_blocking |
( |
char |
c | ) |
|
send character over USART (blocking)
- Parameters
-
- Note
- blocks until character transmission started
Definition at line 89 of file usart.c.
void usart_putchar_nonblocking |
( |
char |
c | ) |
|
send character over USART (non-blocking)
- Parameters
-
- Note
- blocks if transmit buffer is full, else puts in buffer and returns
Definition at line 117 of file usart.c.
ring buffer for received data
Definition at line 52 of file usart.c.
volatile uint8_t rx_i = 0 |
|
static |
current position of read received data
Definition at line 53 of file usart.c.
volatile uint8_t rx_used = 0 |
|
static |
how much data has been received and not red
Definition at line 54 of file usart.c.
ring buffer for data to transmit
Definition at line 55 of file usart.c.
volatile uint8_t tx_i = 0 |
|
static |
current position if transmitted data
Definition at line 56 of file usart.c.
volatile uint8_t tx_used = 0 |
|
static |
how much data needs to be transmitted
Definition at line 57 of file usart.c.
volatile uint8_t usart_received = 0 |
how many bytes available in the received buffer since last read
Definition at line 58 of file usart.c.