mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-09-30 19:03:24 +01:00
67 lines
2 KiB
C
67 lines
2 KiB
C
#include "timers.h"
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#include "uart.h"
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#include "misc.h"
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/* Adapted from https://github.com/nwert/hekate/blob/master/hwinit/uart.c */
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void uart_select(UartDevice dev) {
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unsigned int id = (unsigned int)dev;
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PINMUX_AUX_UARTn_TX_0(id) = 0; /* UART */
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PINMUX_AUX_UARTn_RX_0(id) = 0x48; /* UART, enable, pull up */
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PINMUX_AUX_UARTn_RTS_0(id) = 0; /* UART */
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PINMUX_AUX_UARTn_CTS_0(id) = 0x44; /* UART, enable, pull down */
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}
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void uart_init(UartDevice dev, uint32_t baud) {
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volatile uart_t *uart = get_uart_device(dev);
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/* Set baud rate. */
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uint32_t rate = (8 * baud + 408000000) / (16 * baud);
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uart->UART_LCR = 0x80; /* Enable DLAB. */
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uart->UART_THR_DLAB = (uint8_t)rate; /* Divisor latch LSB. */
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uart->UART_IER_DLAB = (uint8_t)(rate >> 8); /* Divisor latch MSB. */
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uart->UART_LCR = 0; /* Diable DLAB. */
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/* Setup UART in fifo mode. */
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uart->UART_IER_DLAB = 0;
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uart->UART_IIR_FCR = 7; /* Enable and clear TX and RX FIFOs. */
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uart->UART_LSR;
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wait(3 * ((baud + 999999) / baud));
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uart->UART_LCR = 3; /* Set word length 8. */
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uart->UART_MCR = 0;
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uart->UART_MSR = 0;
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uart->UART_IRDA_CSR = 0;
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uart->UART_RX_FIFO_CFG = 1;
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uart->UART_MIE = 0;
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uart->UART_ASR = 0;
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}
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void uart_wait_idle(UartDevice dev, uint32_t which) {
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while (!(get_uart_device(dev)->UART_VENDOR_STATUS & which)) {
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/* Wait */
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}
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}
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void uart_send(UartDevice dev, const void *buf, size_t len)
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{
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volatile uart_t *uart = get_uart_device(dev);
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for (size_t i = 0; i < len; i++) {
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while (uart->UART_LSR & UART_TX_FIFO_FULL) {
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/* Wait until the TX FIFO isn't full */
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}
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uart->UART_THR_DLAB = *((const uint8_t *)buf + i);
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}
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}
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void uart_recv(UartDevice dev, void *buf, size_t len) {
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volatile uart_t *uart = get_uart_device(dev);
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for (size_t i = 0; i < len; i++) {
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while (uart->UART_LSR & UART_RX_FIFO_EMPTY) {
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/* Wait until the RX FIFO isn't empty */
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}
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*((uint8_t *)buf + i) = uart->UART_THR_DLAB;
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}
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}
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