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63 lines
1.4 KiB
63 lines
1.4 KiB
1 year ago
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#include <stdint.h>
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#include "uart.h"
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static struct uart_memory_map *const uart_mm[] = {
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(struct uart_memory_map *const)UART_0_ADDR,
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(struct uart_memory_map *const)UART_1_ADDR,
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};
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// set the baudrate on the chosen uart, if the baud rate is incorrect or invalid
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// then set it to the default value, return the set baudrate value
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int uart_set_baudrate(uart_id id, int baud)
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{
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// FIXME: actually set the baud rate, for now leave it as the default
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(void)baud;
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(void)id;
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return 115200;
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}
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// initialize the uart registers for transmit and receive
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// TODO: also initialize interrupts and thesholds
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int uart_init(uart_id id, uint32_t baud, int stop_bits)
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{
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// FIXME: check baud rate error and propagate it
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(void)uart_set_baudrate(id, baud);
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// change the number of stop bits only if stop_bits > 0
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if (stop_bits > 0)
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uart_mm[id]->txctrl.nstop = !!stop_bits;
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uart_mm[id]->txctrl.txen = 1;
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uart_mm[id]->rxctrl.rxen = 1;
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return 0;
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}
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// transmit a byte of data through a uart line
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void uart_tx_byte(uart_id id, unsigned char b)
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{
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uart_mm[id]->txdata.data = b;
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}
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// busy-wait until the uart buffer is cleared
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void uart_tx_full(uart_id id)
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{
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while (uart_mm[id]->txdata.full);
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}
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// send a buffer through uart
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void uart_tx_buf(uart_id id, unsigned char *buf, unsigned int size)
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{
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for (unsigned int i = 0; i < size; i++) {
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uart_tx_byte(id, buf[i]);
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uart_tx_full(id);
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}
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}
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