mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-27 23:20:26 +09:00
7d95f2a329
Add a simple LCD driver which uses SDL to display the image. We update the image regularly, while still providing for reasonable performance. Adjust the common lcd code to support sandbox. For command-line runs we do not want the LCD to be displayed, so add a --show_lcd option to enable it. Tested-by: Che-Liang Chiou <clchiou@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* This provide a test serial port. It provides an emulated serial port where
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* a test program and read out the serial output and inject serial input for
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* U-Boot.
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*/
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#include <common.h>
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#include <lcd.h>
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#include <os.h>
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#include <serial.h>
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#include <linux/compiler.h>
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/*
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*
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* serial_buf: A buffer that holds keyboard characters for the
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* Sandbox U-boot.
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*
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* invariants:
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* serial_buf_write == serial_buf_read -> empty buffer
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* (serial_buf_write + 1) % 16 == serial_buf_read -> full buffer
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*/
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static char serial_buf[16];
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static unsigned int serial_buf_write;
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static unsigned int serial_buf_read;
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static int sandbox_serial_init(void)
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{
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os_tty_raw(0);
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return 0;
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}
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static void sandbox_serial_setbrg(void)
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{
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}
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static void sandbox_serial_putc(const char ch)
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{
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os_write(1, &ch, 1);
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}
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static void sandbox_serial_puts(const char *str)
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{
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os_write(1, str, strlen(str));
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}
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static unsigned int increment_buffer_index(unsigned int index)
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{
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return (index + 1) % ARRAY_SIZE(serial_buf);
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}
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static int sandbox_serial_tstc(void)
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{
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const unsigned int next_index =
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increment_buffer_index(serial_buf_write);
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ssize_t count;
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os_usleep(100);
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#ifdef CONFIG_LCD
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lcd_sync();
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#endif
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if (next_index == serial_buf_read)
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return 1; /* buffer full */
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count = os_read_no_block(0, &serial_buf[serial_buf_write], 1);
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if (count == 1)
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serial_buf_write = next_index;
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return serial_buf_write != serial_buf_read;
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}
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static int sandbox_serial_getc(void)
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{
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int result;
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while (!sandbox_serial_tstc())
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; /* buffer empty */
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result = serial_buf[serial_buf_read];
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serial_buf_read = increment_buffer_index(serial_buf_read);
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return result;
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}
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static struct serial_device sandbox_serial_drv = {
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.name = "sandbox_serial",
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.start = sandbox_serial_init,
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.stop = NULL,
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.setbrg = sandbox_serial_setbrg,
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.putc = sandbox_serial_putc,
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.puts = sandbox_serial_puts,
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.getc = sandbox_serial_getc,
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.tstc = sandbox_serial_tstc,
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};
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void sandbox_serial_initialize(void)
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{
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serial_register(&sandbox_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &sandbox_serial_drv;
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}
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