Landfall

Annotated pkg/landfall-examples/qi_lb60_keypad/qi_lb60_keypad.c

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9 months ago Paul Boddie file changeset files shortlog Employed get_channel to eliminate redundant code. cpm-library-improvements
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/*
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 * Access the keypad GPIOs on the Ben NanoNote.
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 *
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 * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation; either version 2 of
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 * the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor,
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 * Boston, MA  02110-1301, USA
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 */
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#include <l4/devices/gpio-jz4740.h>
 
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#include <l4/re/c/util/video/goos_fb.h>
 
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#include <l4/re/c/video/view.h>
 
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#include <l4/util/util.h>
 
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#include <unistd.h>
 
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#include <stdint.h>
 
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#include "memory.h"
 
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enum Jz4740_keypad_gpio
 
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{
 
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  Jz4740_keypad_gpio_inputs_count = 8,
 
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  Jz4740_keypad_gpio_outputs_count = 8,
 
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};
 
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/* Port D input pins. */
 
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const uint8_t Jz4740_keypad_inputs[Jz4740_keypad_gpio_inputs_count] = {
 
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  18, 19, 20, 21, 22, 23, 24, 26
 
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};
 
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const Pin_slice Jz4740_keypad_inputs_mask = {.mask = 0x05fc0000, .offset = 0};
 
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/* Port C output pins. */
 
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const uint8_t Jz4740_keypad_outputs[Jz4740_keypad_gpio_outputs_count] = {
 
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  10, 11, 12, 13, 14, 15, 16, 17
 
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};
 
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const Pin_slice Jz4740_keypad_outputs_mask = {.mask = 0x0003fc00, .offset = 0};
 
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/* Video abstractions. */
 
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static l4re_util_video_goos_fb_t gfb;
 
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static l4re_video_view_info_t fbi;
 
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static void *fb;
 
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/* Peripheral memory regions. */
 
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static l4_addr_t gpio_virt_base = 0, gpio_virt_base_end = 0;
 
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/* GPIO abstractions. */
 
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static void *gpio_port_c, *gpio_port_d;
 
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/* Keypad status. */
 
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uint8_t keypad[Jz4740_keypad_gpio_outputs_count];
 
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/* Initialise the pins for scanning the keypad. */
 
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static void init_keyscan(void)
 
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{
 
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  jz4740_gpio_multi_setup(gpio_port_d, &Jz4740_keypad_inputs_mask, Fix_input, 0);
 
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  jz4740_gpio_multi_config_pull(gpio_port_d, &Jz4740_keypad_inputs_mask, Pull_up);
 
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  jz4740_gpio_multi_setup(gpio_port_c, &Jz4740_keypad_outputs_mask, Fix_input, 0);
 
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}
 
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/*
 
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Scan the keypad by enabling each output column and inspecting each input row.
 
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Store each column bitmap in the keypad array.
 
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*/
 
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static void scan_keypad(void)
 
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{
 
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  uint8_t column, row, value;
 
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  for (column = 0; column < Jz4740_keypad_gpio_outputs_count; column++)
 
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  {
 
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    jz4740_gpio_setup(gpio_port_c, Jz4740_keypad_outputs[column], Fix_output, 0);
 
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    l4_sleep(1);
 
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    value = 0;
 
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    for (row = 0; row < Jz4740_keypad_gpio_inputs_count; row++)
 
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      value = (value << 1) | (jz4740_gpio_get(gpio_port_d, Jz4740_keypad_inputs[row]) ? 0 : 1);
 
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    keypad[column] = value;
 
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    jz4740_gpio_setup(gpio_port_c, Jz4740_keypad_outputs[column], Fix_input, 0);
 
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  }
 
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}
 
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static uint32_t bitmask(uint32_t size)
 
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{
 
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  return (1 << size) - 1;
 
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}
 
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static uint32_t truncate_channel(uint32_t value, uint32_t size)
 
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{
 
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  return (value >> (8 - size)) & bitmask(size);
 
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}
 
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static void set_pixel(uint32_t pos, uint8_t bpp, uint32_t value)
 
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{
 
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  if (bpp <= 8) *(uint8_t *) pos = value;
 
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  else if (bpp <= 16) *(uint16_t *) pos = value;
 
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  else *(uint32_t *) pos = value;
 
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}
 
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/* Show the state of a key on the display. */
 
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static void show_keystate(uint32_t x, uint32_t y, uint32_t w, uint32_t h, uint32_t rgb)
 
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{
 
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  uint8_t bpp = l4re_video_bits_per_pixel(&fbi.pixel_info);
 
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  uint8_t bytes_per_pixel = fbi.pixel_info.bytes_per_pixel;
 
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  uint32_t bytes_per_line = fbi.bytes_per_line;
 
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  uint32_t pos;
 
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  uint32_t col, row;
 
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  rgb = (truncate_channel(rgb >> 16, fbi.pixel_info.r.size) << fbi.pixel_info.r.shift) |
 
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        (truncate_channel(rgb >> 8, fbi.pixel_info.g.size) << fbi.pixel_info.g.shift) |
 
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        (truncate_channel(rgb, fbi.pixel_info.b.size) << fbi.pixel_info.b.shift);
 
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  for (row = 0; row < h; row++)
 
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  {
 
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    pos = (uint32_t) fb + (y + row) * bytes_per_line + x * bytes_per_pixel;
 
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    for (col = 0; col < w; col++)
 
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    {
 
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      set_pixel(pos, bpp, rgb);
 
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      pos += bytes_per_pixel;
 
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    }
 
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  }
 
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}
 
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/* Show the keypad status on the display. */
 
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static void show_keypad(void)
 
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{
 
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  uint32_t colsize = fbi.width / Jz4740_keypad_gpio_outputs_count,
 
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           rowsize = fbi.height / Jz4740_keypad_gpio_inputs_count;
 
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  uint8_t column, row;
 
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  uint32_t mask;
 
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  for (column = 0; column < Jz4740_keypad_gpio_outputs_count; column++)
 
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    for (row = 0, mask = 1 << (Jz4740_keypad_gpio_inputs_count - 1);
 
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         row < Jz4740_keypad_gpio_inputs_count;
 
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         row++, mask >>= 1)
 
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      show_keystate(column * colsize, row * rowsize, colsize, rowsize,
 
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                    keypad[column] & mask ? 0xffffff : 0);
 
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  /* Refresh the display. */
 
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  l4re_util_video_goos_fb_refresh(&gfb, 0, 0, fbi.width, fbi.height);
 
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}
 
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int main(void)
 
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{
 
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  int result;
 
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  if ((result = get_memory("jz4740-gpio", &gpio_virt_base, &gpio_virt_base_end)) < 0)
 
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    return 1;
 
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  if (l4re_util_video_goos_fb_setup_name(&gfb, "fb"))
 
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    return 1;
 
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  if (l4re_util_video_goos_fb_view_info(&gfb, &fbi))
 
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    return 1;
 
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  if (!(fb = l4re_util_video_goos_fb_attach_buffer(&gfb)))
 
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    return 1;
 
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  gpio_port_c = jz4740_gpio_init(gpio_virt_base + 0x200, gpio_virt_base + 0x300, 32);
 
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  gpio_port_d = jz4740_gpio_init(gpio_virt_base + 0x300, gpio_virt_base + 0x400, 32);
 
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  init_keyscan();
 
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  while (1)
 
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  {
 
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    scan_keypad();
 
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    show_keypad();
 
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  }
 
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  return 0;
 
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}