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   1 /*
   2  * Copyright © 2017 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 #include <ao.h>
  16 #include <ao_as1107.h>
  17
  18 static uint8_t  as1107_configured;
  19 static uint8_t  as1107_mutex;
  20
  21 static void
  22 ao_as1107_start(void) {
  23         ao_spi_get_bit(AO_AS1107_CS_PORT, AO_AS1107_CS_PIN, AO_AS1107_CS, AO_AS1107_SPI_INDEX, AO_AS1107_SPI_SPEED);
  24 }
  25
  26 static void
  27 ao_as1107_stop(void) {
  28         ao_spi_put_bit(AO_AS1107_CS_PORT, AO_AS1107_CS_PIN, AO_AS1107_CS, AO_AS1107_SPI_INDEX);
  29 }
  30
  31 static void
  32 _ao_as1107_cmd(uint8_t addr, uint8_t value)
  33 {
  34         uint8_t packet[2] = { addr, value };
  35
  36         ao_as1107_start();
  37         ao_spi_send(packet, 2, AO_AS1107_SPI_INDEX);
  38         ao_as1107_stop();
  39 }
  40
  41 static void
  42 _ao_as1107_setup(void)
  43 {
  44         if (!as1107_configured) {
  45                 as1107_configured = 1;
  46                 _ao_as1107_cmd(AO_AS1107_SHUTDOWN, AO_AS1107_SHUTDOWN_SHUTDOWN_RESET);
  47                 _ao_as1107_cmd(AO_AS1107_DECODE_MODE, AO_AS1107_DECODE);
  48                 _ao_as1107_cmd(AO_AS1107_SCAN_LIMIT, AO_AS1107_NUM_DIGITS - 1);
  49                 _ao_as1107_cmd(AO_AS1107_FEATURE,
  50                                (0 << AO_AS1107_FEATURE_CLK_EN) |
  51                                (0 << AO_AS1107_FEATURE_REG_RES) |
  52                                (1 << AO_AS1107_FEATURE_DECODE_SEL) |
  53                                (1 << AO_AS1107_FEATURE_SPI_EN) |
  54                                (0 << AO_AS1107_FEATURE_BLINK_EN) |
  55                                (0 << AO_AS1107_FEATURE_BLINK_FREQ) |
  56                                (0 << AO_AS1107_FEATURE_SYNC) |
  57                                (0 << AO_AS1107_FEATURE_BLINK_START));
  58         }
  59 }
  60
  61 void
  62 ao_as1107_write(uint8_t start, uint8_t count, uint8_t *values)
  63 {
  64         uint8_t i;
  65         ao_mutex_get(&as1107_mutex);
  66         _ao_as1107_setup();
  67         for (i = 0; i < count; i++)
  68         {
  69                 _ao_as1107_cmd(AO_AS1107_DIGIT(start + i),
  70                                values[i]);
  71         }
  72         ao_mutex_put(&as1107_mutex);
  73 }
  74
  75 void
  76 ao_as1107_write_8(uint8_t start, uint8_t value)
  77 {
  78         uint8_t values[2];
  79
  80         values[0] = (value >> 4);
  81         values[1] = value & 0xf;
  82         ao_as1107_write(start, 2, values);
  83 }
  84
  85 void
  86 ao_as1107_write_16(uint8_t start, uint16_t value)
  87 {
  88         uint8_t values[4];
  89
  90         values[0] = (value >> 12);
  91         values[1] = (value >> 8) & 0xf;
  92         values[2] = (value >> 4) & 0xf;
  93         values[3] = (value) & 0xf;
  94         ao_as1107_write(start, 4, values);
  95 }
  96
  97 void
  98 ao_as1107_init(void)
  99 {
 100         as1107_configured = 0;
 101         ao_spi_init_cs(AO_AS1107_CS_PORT, (1 << AO_AS1107_CS_PIN));
 102 }