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Update UART driver API (#14839)

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* Add uart_puts() and uart_gets()

* Add some docs

* Rework API

* Formatting

* Update docs/uart_driver.md

Co-authored-by: Sergey Vlasov <sigprof@gmail.com>

* Simplify a uart_write() loop

* Update platforms/avr/drivers/uart.c

Co-authored-by: Joel Challis <git@zvecr.com>

Co-authored-by: Sergey Vlasov <sigprof@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>
This commit is contained in:
Ryan 2021-11-14 05:23:14 +11:00 • committed by GitHub
parent 7e86c37962
commit 04b51e381e
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8 changed files with 72 additions and 25 deletions
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26
platforms/avr/drivers/uart.c
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@ -100,7 +100,7 @@ void uart_init(uint32_t baud) {
}
// Transmit a byte
void uart_putchar(uint8_t c) {
void uart_write(uint8_t data) {
uint8_t i;
i = tx_buffer_head + 1;
@ -110,27 +110,39 @@ void uart_putchar(uint8_t c) {
while (tx_buffer_tail == i)
; // wait until space in buffer
// cli();
tx_buffer[i] = c;
tx_buffer[i] = data;
tx_buffer_head = i;
UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn) | (1 << UDRIEn);
// sei();
}
// Receive a byte
uint8_t uart_getchar(void) {
uint8_t c, i;
uint8_t uart_read(void) {
uint8_t data, i;
while (rx_buffer_head == rx_buffer_tail)
; // wait for character
i = rx_buffer_tail + 1;
if (i >= RX_BUFFER_SIZE) i = 0;
c = rx_buffer[i];
data = rx_buffer[i];
rx_buffer_tail = i;
return c;
return data;
}
void uart_transmit(const uint8_t *data, uint16_t length) {
for (uint16_t i = 0; i < length; i++) {
uart_write(data[i]);
}
}
void uart_receive(uint8_t *data, uint16_t length) {
for (uint16_t i = 0; i < length; i++) {
data[i] = uart_read();
}
}
// Return whether the number of bytes waiting in the receive buffer is nonzero.
// Call this before uart_getchar() to check if it will need
// Call this before uart_read() to check if it will need
// to wait for a byte to arrive.
bool uart_available(void) {
uint8_t head, tail;