00001 /* 00002 00003 Copyright (c) 2010, Embedded Adventures, www.embeddedadventures.com 00004 All rights reserved. 00005 00006 Redistribution and use in source and binary forms, with or without 00007 modification, are permitted provided that the following conditions are met: 00008 00009 - Redistributions of source code must retain the above copyright notice, 00010 this list of conditions and the following disclaimer. 00011 00012 - Redistributions in binary form must reproduce the above copyright 00013 notice, this list of conditions and the following disclaimer in the 00014 documentation and/or other materials provided with the distribution. 00015 00016 - Neither the name of Embedded Adventures nor the names of its contributors 00017 may be used to endorse or promote products derived from this software 00018 without specific prior written permission. 00019 00020 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00021 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00022 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00023 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 00024 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00025 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00026 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00027 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00028 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00029 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 00030 THE POSSIBILITY OF SUCH DAMAGE. 00031 00032 Contact us at admin@embeddedadventures.com 00033 00034 */ 00035 00036 00037 #include "pcd8544.h" 00038 #include "pic_serial.h" 00039 00040 void pcd8544_setup_io() { 00041 00042 // Do this in software for the moment 00043 00044 make_output(pcd8544_res_port, pcd8544_res_pin); 00045 make_output(pcd8544_sclk_port, pcd8544_sclk_pin); 00046 make_output(pcd8544_sdin_port, pcd8544_sdin_pin); 00047 make_output(pcd8544_dc_port, pcd8544_dc_pin); 00048 make_output(pcd8544_sce_port, pcd8544_sce_pin); 00049 00050 set_pin(pcd8544_res_port, pcd8544_res_pin); // not in reset 00051 set_pin(pcd8544_sce_port, pcd8544_sce_pin); // ignore clock for the moment 00052 clear_pin(pcd8544_sclk_port, pcd8544_sclk_pin); // clear clock 00053 } 00054 00055 void pcd8544_init() { 00056 00057 /* 00058 set_pin (pcd8544_res_port, pcd8544_res_pin); 00059 set_pin(pcd8544_sce_port, pcd8544_sce_pin); 00060 */ 00061 00062 // toggle reset 00063 // must be at least 100ns 00064 clear_pin(pcd8544_res_port, pcd8544_res_pin); // pulse low for reset 00065 delay_ms(100); 00066 set_pin (pcd8544_res_port, pcd8544_res_pin); 00067 00068 // Function set: PD=0 (chip active), V=1 (vertical addressing), H=1 (extended instructions) 00069 pcd8544_send_command(0b00100011); // 0x21 00070 00071 // Set Vop (contrast) to 72 - 7 least significant bits 00072 pcd8544_send_command(0b11001000); // 0xc8 00073 00074 // Set temperature coefficient to 2 - 2 least significant bits 00075 pcd8544_send_command(0b00000110); // 0x06 00076 00077 // Set bias mode to 3 (1:48) - 3 least significant bits 00078 pcd8544_send_command(0b00010011); // 0x13 00079 00080 // Function set: PD=0 (chip active), V=1 (vertical addressing), H=0 (basic instructions) 00081 pcd8544_send_command(0b00100010); // 0x20 00082 00083 // Display control: D=0, E=0 (Blank the screen) 00084 pcd8544_send_command(0b00001000); // 0x08 00085 00086 // Display control: D=1, E=0 (Normal mode) 00087 pcd8544_send_command(0b00001100); 00088 00089 } 00090 00091 void pcd8544_send_command(uns8 cmd) { 00092 00093 clear_pin(pcd8544_sce_port, pcd8544_sce_pin); 00094 clear_pin(pcd8544_dc_port, pcd8544_dc_pin); 00095 pcd8544_send_byte(cmd); 00096 set_pin(pcd8544_sce_port, pcd8544_sce_pin); 00097 } 00098 00099 void pcd8544_send_data(uns8 data) { 00100 00101 clear_pin(pcd8544_sce_port, pcd8544_sce_pin); 00102 set_pin(pcd8544_dc_port, pcd8544_dc_pin); 00103 pcd8544_send_byte(data); 00104 set_pin(pcd8544_sce_port, pcd8544_sce_pin); 00105 } 00106 00107 void pcd8544_send_byte(uns8 b) { 00108 00109 uns8 count; 00110 00111 // msb sent first 00112 for (count = 0; count < 8; count++) { 00113 change_pin(pcd8544_sdin_port, pcd8544_sdin_pin, b.7); 00114 b = b << 1; 00115 // toggle the clock 00116 set_pin(pcd8544_sclk_port, pcd8544_sclk_pin); 00117 clear_pin(pcd8544_sclk_port, pcd8544_sclk_pin); 00118 } 00119 }