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uart: upgrade C api

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This commit is contained in:
Paul Mathieu
2021-03-13 15:49:28 -08:00
parent 5d5eeb45cc
commit 75b5488b8d
4 changed files with 27 additions and 20 deletions
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17
uart/uart.h
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@@ -1,13 +1,16 @@
#define UART_BASE 0xc010
#define UART_DATA ((volatile char*) (UART_BASE + 0x00))
#define UART_STATUS ((volatile char*) (UART_BASE + 0x02))
#pragma once
#define UART_STATUS_RXNE_pos 1
#define UART_STATUS_RXNE_msk (1 << UART_STATUS_RXNE_pos)
#define UART_STATUS_TXE_pos 0
#define UART_STATUS_TXE_msk (1 << UART_STATUS_TXE_pos)
int uart_rx_available();
int uart_tx_available();
void uart_write(const char c);
char uart_read();
struct uart {
volatile uint8_t data;
volatile uint16_t flags;
};
int uart_rx_available(struct uart* uart);
int uart_tx_available(struct uart* uart);
void uart_write(struct uart* uart, const char c);
char uart_read(struct uart* uart);