annotate code_part1/OSTC_code_asm_part1/i2c_eeprom.asm @ 644:420e62cd88ad

point to correct diluent location
author heinrichsweikamp
date Wed, 03 Oct 2012 13:12:02 +0200
parents 16f4eafc197e
children c50296c3059e
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1
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2 ; OSTC - diving computer code
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3 ; Copyright (C) 2008 HeinrichsWeikamp GbR
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4 ; This program is free software: you can redistribute it and/or modify
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5 ; it under the terms of the GNU General Public License as published by
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6 ; the Free Software Foundation, either version 3 of the License, or
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7 ; (at your option) any later version.
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8 ; This program is distributed in the hope that it will be useful,
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9 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 ; GNU General Public License for more details.
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12 ; You should have received a copy of the GNU General Public License
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13 ; along with this program. If not, see <http://www.gnu.org/licenses/>.
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14 ; provides routines for external EEPROM via I2C
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15 ; written by: Matthias Heinrichs, info@heinrichsweikamp.com
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16 ; written: 051030
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17 ; last updated: 120421
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18 ; known bugs:
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19 ; ToDo:
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20
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21 incf_eeprom_address macro ext_ee_temp1 ; Will increase eeprom_address:2 with the 8Bit value "ext_ee_temp1"
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22 movlw ext_ee_temp1
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23 call incf_eeprom_address0
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24 endm
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25
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26 incf_eeprom_address0:
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27 addwf eeprom_address+0,F ; increase address
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28 movlw d'0'
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29 addwfc eeprom_address+1,F
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30 return
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31
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32 ;=============================================================================
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33 ; Will decrease eeprom_address:2 with the 8Bit value "ext_ee_temp1"
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34
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35
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36 decf_eeprom_address macro ext_ee_temp1
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37 movlw ext_ee_temp1
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38 call decf_eeprom_address0
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39 endm
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40
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41 decf_eeprom_address0:
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42 subwf eeprom_address+0,F ; decrease address: do a 16-8bits substract.
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43 movlw d'0'
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44 subwfb eeprom_address+1,F
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45 return
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46
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47 ;=============================================================================
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48
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49 write_external_eeprom: ; data in WREG
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50 ; increase address eeprom_address+0:eeprom_address+1 after write
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51 ; with banking after 7FFF
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52 #ifdef TESTING
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53 ; When Simulating with MPLabSIM, there is no way to emulate external EEPROM...
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54 return
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55 #endif
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56
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57 rcall I2CWRITE ; writes WREG into EEPROM@eeprom_address
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58 movlw d'1' ; increase address
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59 addwf eeprom_address+0,F
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60 movlw d'0'
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61 addwfc eeprom_address+1,F
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62 return
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63
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64 write_external_eeprom_block: ; Writes a block of 64Byte (one page in external EEPROM without stop condition
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65 #ifdef TESTING
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66 ; When Simulating with MPLabSIM, there is no way to emulate external EEPROM...
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67 return
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68 #endif
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69
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70 btfsc eeprom_blockwrite ; Blockwrite continue?
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71 rcall I2CWRITE_BLOCK2
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72 btfss eeprom_blockwrite ; Blockwrite start?
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73 rcall I2CWRITE_BLOCK
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74 bsf eeprom_blockwrite ; After the start, do blockwriting for the next 63Bytes!
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75
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76 movlw d'0' ; increase address
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77 incf eeprom_address+0,F
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78 addwfc eeprom_address+1,F
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79 return
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80
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81 I2CWRITE_BLOCK:
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82 movwf ext_ee_temp1 ; Data byte in WREG
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83 bsf SSPCON2,SEN ; Start condition
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84 rcall WaitMSSP
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85 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
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86 btfss eeprom_address+1,7 ; Access Block2?
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87 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
0
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88 movwf SSPBUF ; control byte
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89 rcall WaitMSSP
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90 rcall I2C_WaitforACK
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91 movff eeprom_address+1,SSPBUF ; High Address byte
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92 rcall WaitMSSP
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93 rcall I2C_WaitforACK
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94 movff eeprom_address+0,SSPBUF ; Low Address byte
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95 rcall WaitMSSP
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96 rcall I2C_WaitforACK
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97 I2CWRITE_BLOCK2:
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98 movff ext_ee_temp1, SSPBUF ; Data Byte
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99 rcall WaitMSSP
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100 rcall I2C_WaitforACK
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101 return
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102
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103
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104 get_free_EEPROM_location: ; Searches 0xFD, 0xFD, 0xFE and sets Pointer to 0xFE
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105
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106 #ifdef TESTING
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107 ; In testing mode, find 0x100 (internal EEPROM) as the first free location...
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108 clrf eeprom_address+0 ; Not found in entire EEPROM, set to address 0
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109 movlw 0x1
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110 movwf eeprom_address+1
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111 return
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112 #endif
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113
0
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114 clrf ext_ee_temp1 ; low address counter
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115 clrf ext_ee_temp2 ; high address counter
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116 bcf second_FD ; clear flags
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117 bcf first_FD
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118 bcf eeprom_switched_b1
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119 get_free_EEPROM_location3:
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120 bsf SSPCON2, PEN ; Stop condition
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121 rcall WaitMSSP
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122 bsf SSPCON2,SEN ; Start condition
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123 rcall WaitMSSP
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124 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
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125 btfss ext_ee_temp2,7 ; Access Block2?
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126 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
0
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127 movwf SSPBUF ; control byte
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128 rcall WaitMSSP
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129 btfsc SSPCON2,ACKSTAT
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130 bra get_free_EEPROM_location3 ; EEPROM NOT acknowledged, retry!
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131
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132 movff ext_ee_temp2,SSPBUF ; High Address byte
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133 rcall WaitMSSP
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134 rcall I2C_WaitforACK
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135 movff ext_ee_temp1,SSPBUF ; Low Address byte
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136 rcall WaitMSSP
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137 rcall I2C_WaitforACK
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138
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139 bsf SSPCON2,RSEN ; Start condition
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140 rcall WaitMSSP
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141 movlw b'10101111' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
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142 btfss ext_ee_temp2,7 ; Access Block2?
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143 movlw b'10100111' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
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144 movwf SSPBUF ; control byte
0
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145 rcall WaitMSSP
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146 rcall I2C_WaitforACK
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147
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148 get_free_EEPROM_location2:
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149 btfsc eeprom_switched_b1 ; Switched to Block1 already?
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150 bra get_free_EEPROM_location2_x ; Yes, skip this check!
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151
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152 btfsc ext_ee_temp2,7 ; Access Block1?
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153 bsf eeprom_switched_b1 ; Yes, and set the flag so this check is skipped in the rest of this routine
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154 btfsc ext_ee_temp2,7 ; Access Block1?
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155 bra get_free_EEPROM_location3 ; Yes, initiate new read sequence in block1
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156
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157 get_free_EEPROM_location2_x:
0
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158 bsf SSPCON2, RCEN ; Enable recieve mode
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159 rcall WaitMSSP
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160 btfsc first_FD
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161 bra test_2nd_FD
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162 bsf first_FD ; found first 0xFD?
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163 movlw 0xFD
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164 cpfseq SSPBUF
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165 bcf first_FD ; No
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166 bra get_free_EEPROM_location2c
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167
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168 test_2nd_FD:
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169 btfsc second_FD
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170 bra test_FE
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171 bsf second_FD ; found second 0xFD?
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172 movlw 0xFD
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173 cpfseq SSPBUF
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174 bra get_free_EEPROM_location2b ;No, clear both flags
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175 bra get_free_EEPROM_location2c
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176 test_FE:
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177 movlw 0xFE ; found the final 0xFE?
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
178 cpfseq SSPBUF
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
179 bra get_free_EEPROM_location2b ;No, clear both flags
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
180 movff ext_ee_temp1,eeprom_address+0 ;Yes, copy ext_ee_temp1->eeprom_address+0 and
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
181 movff ext_ee_temp2,eeprom_address+1 ;ext_ee_temp2->eeprom_address+1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
182 bra get_free_EEPROM_location4 ; Done.
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
183
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
184 get_free_EEPROM_location2b:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
185 bcf second_FD ; clear both flags!
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
186 bcf first_FD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
187 get_free_EEPROM_location2c:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
188 movlw d'1' ; and increase search address
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
189 addwf ext_ee_temp1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
190 movlw d'0'
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
191 addwfc ext_ee_temp2,F
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
192
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
193 movlw 0xFF
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
194 cpfseq ext_ee_temp2 ; =0xFFFF
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
195 bra get_free_EEPROM_location2d ; No
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
196 cpfseq ext_ee_temp1 ; =0xFFFF
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
197 bra get_free_EEPROM_location2d ; No
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
198
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
199 bra get_free_EEPROM_location3b ; yes
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
200
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
201 get_free_EEPROM_location2d:
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
202 bsf SSPCON2, ACKEN ; no, send Ack
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
203 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
204 bra get_free_EEPROM_location2 ; and continue search
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
205 get_free_EEPROM_location3b:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
206 clrf eeprom_address+0 ; Not found in entire EEPROM, set to address 0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
207 clrf eeprom_address+1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
208 get_free_EEPROM_location4:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
209 bsf SSPCON2, PEN ; Stop
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
210 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
211
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
212 bcf second_FD ; clear flags
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
213 bcf first_FD
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
214 return ; return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
215
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
216
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
217 I2CREAD:
245
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
218 rcall I2CREAD_COMMON
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
219 bsf SSPCON2, PEN ; Stop
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
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diff changeset
220 rcall WaitMSSP
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
221 return
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
222
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
223 I2CREAD2: ; same as I2CREAD but with automatic address increase
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
224 rcall I2CREAD
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
225 I2CREAD2_2:
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
226 movlw d'1'
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
227 addwf eeprom_address+0,F
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
228 movlw d'0'
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
229 addwfc eeprom_address+1,F
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
230 return
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
231 I2CREAD3: ; block read start with automatic address increase
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
232 rcall I2CREAD_COMMON
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
233 ; no Stop condition here
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
234 bra I2CREAD2_2
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
235
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
236 I2CREAD4: ; block read with automatic address increase
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
237 bsf SSPCON2,ACKEN ; Master acknowlegde
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
238 rcall WaitMSSP
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
239 bsf SSPCON2, RCEN ; Enable recieve mode
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
240 rcall WaitMSSP
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
241 movf SSPBUF,W ; copy read byte into WREG
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
242 ; no Stop condition here
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
243 bra I2CREAD2_2
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
244
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
245
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
246 I2CREAD_COMMON:
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
247 bsf SSPCON2, PEN ; Stop
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
248 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
249 bsf SSPCON2,SEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
250 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
251
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
252 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
253 btfss eeprom_address+1,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
254 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
255 movwf SSPBUF ; control byte
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
256 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
257 btfsc SSPCON2,ACKSTAT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
258 bra I2CREAD ; EEPROM NOT acknowledged, retry!
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
259 movff eeprom_address+1,SSPBUF ; High Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
260 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
261 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
262 movff eeprom_address+0,SSPBUF ; Low Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
263 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
264 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
265
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
266 bsf SSPCON2,RSEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
267 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
268
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
269 movlw b'10101111' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
270 btfss eeprom_address+1,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
271 movlw b'10100111' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
272 movwf SSPBUF ; control byte
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
273 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
274 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
275
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
276 bsf SSPCON2, RCEN ; Enable recieve mode
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
277 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
278 movf SSPBUF,W ; copy read byte into WREG
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
279 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
280
245
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
281
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
282 I2CWRITE:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
283 movwf ext_ee_temp1 ; Data byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
284 bsf SSPCON2,SEN ; Start condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
285 rcall WaitMSSP
350
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
286 movlw b'10101110' ; Bit0=0: WRITE, Bit0=1: READ, BLOCK2
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
287 btfss eeprom_address+1,7 ; Access Block2?
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
288 movlw b'10100110' ; No, -> Bit0=0: WRITE, Bit0=1: READ, BLOCK1
7250ca7c8d24 64kByte logbook (Still incompatible to existing PC software)
heinrichsweikamp
parents: 245
diff changeset
289 movwf SSPBUF ; control byte
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
290 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
291 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
292 movff eeprom_address+1,SSPBUF ; High Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
293 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
294 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
295 movff eeprom_address+0,SSPBUF ; Low Address byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
296 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
297 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
298 movff ext_ee_temp1, SSPBUF ; Data Byte
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
299 rcall WaitMSSP
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
300 rcall I2C_WaitforACK
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
301 bsf SSPCON2,PEN ; Stop condition
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
302 rcall WaitMSSP
245
dee88c962653 Some clean up and minor I2C speed improvements
heinrichsweikamp
parents: 148
diff changeset
303 WAITMS d'5' ; Write delay
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
304 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
305
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
306 I2C_WaitforACK:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
307 btfsc SSPCON2,ACKSTAT ; checks for ACK bit from slave
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
308 rcall I2CFail
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
309 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
310
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
311 I2CFail:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
312 ostc_debug 'M' ; Sends debug-information to screen if debugmode active
21
73014f788032 1.60 stable rc1
heinrichsweikamp
parents: 0
diff changeset
313 bsf LED_red
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
314 rcall I2CReset ; I2C Reset
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
315 bcf PIR1,SSPIF
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
316 clrf i2c_temp
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
317 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
318
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
319 WaitMSSP:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
320 decfsz i2c_temp,F ; check for timeout during I2C action
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
321 bra WaitMSSP2
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
322 bra I2CFail ; timeout occured
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
323 WaitMSSP2:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
324 btfss PIR1,SSPIF
595
16f4eafc197e CNS for pSCR-GF fixed.
heinrichsweikamp
parents: 573
diff changeset
325 bra WaitMSSP
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
326 clrf i2c_temp
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
327 bcf PIR1,SSPIF
595
16f4eafc197e CNS for pSCR-GF fixed.
heinrichsweikamp
parents: 573
diff changeset
328 nop
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
329 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
330
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
331 I2CReset: ; Something went wrong (Slave holds SDA low?)
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
332 clrf SSPCON1 ; wake-up slave and reset entire module
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
333 ostc_debug 'N' ; Sends debug-information to screen if debugmode active
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
334 clrf SSPCON2
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
335 clrf SSPSTAT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
336 bcf TRISC,3 ; SCL OUTPUT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
337 bsf TRISC,4 ; SDA Input
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
338 bcf PORTC,3
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
339 movlw d'9'
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
340 movwf i2c_temp ; clock-out 9 clock cycles manually
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
341 I2CReset_1:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
342 bsf PORTC,3 ; SCL=1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
343 nop
539
a587f491693d clock in I2C "bus failed" routine
heinrichsweikamp
parents: 537
diff changeset
344 nop
a587f491693d clock in I2C "bus failed" routine
heinrichsweikamp
parents: 537
diff changeset
345 nop
a587f491693d clock in I2C "bus failed" routine
heinrichsweikamp
parents: 537
diff changeset
346 nop
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
347 btfsc PORTC,4 ; SDA=1?
539
a587f491693d clock in I2C "bus failed" routine
heinrichsweikamp
parents: 537
diff changeset
348 bra I2CReset_2 ; =1, SDA has been released from slave
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
349 bcf PORTC,3 ; SCL=0
539
a587f491693d clock in I2C "bus failed" routine
heinrichsweikamp
parents: 537
diff changeset
350 nop
a587f491693d clock in I2C "bus failed" routine
heinrichsweikamp
parents: 537
diff changeset
351 nop
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
352 bcf PORTC,3
539
a587f491693d clock in I2C "bus failed" routine
heinrichsweikamp
parents: 537
diff changeset
353 nop
a587f491693d clock in I2C "bus failed" routine
heinrichsweikamp
parents: 537
diff changeset
354 nop
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
355 decfsz i2c_temp,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
356 bra I2CReset_1 ; check for nine clock cycles
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
357 I2CReset_2:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
358 bsf TRISC,3 ; SCL Input
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
359 clrf SSPCON1 ; set I²C Mode
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
360 WAITMS d'10' ; Reset-Timeout for I2C devices
537
3091628b2742 BUGFIX: Spurious logbook read issue
heinrichsweikamp
parents: 455
diff changeset
361 movlw SSPSTAT_VALUE
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
362 movwf SSPSTAT
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
363 movlw b'00101000'
96a35aeda5f2 Initial setup
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364 movwf SSPCON1
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365 movlw b'00000000'
96a35aeda5f2 Initial setup
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366 movwf SSPCON2
537
3091628b2742 BUGFIX: Spurious logbook read issue
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367 movlw SSPADD_VALUE
0
96a35aeda5f2 Initial setup
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368 movwf SSPADD
21
73014f788032 1.60 stable rc1
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369 bcf LED_red
0
96a35aeda5f2 Initial setup
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370 ostc_debug 'O' ; Sends debug-information to screen if debugmode active
96a35aeda5f2 Initial setup
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371 return
53
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372
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373 ;I2C_TX:
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374 ; movwf i2c_temp2 ; Data byte
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375 ; bsf SSPCON2,SEN ; Start condition
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376 ; rcall WaitMSSP
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377 ; movlw b'10010000' ; Bit0=0: WRITE, Bit0=1: READ
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378 ; movwf SSPBUF ; control byte
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379 ; rcall WaitMSSP
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380 ; rcall I2C_WaitforACK
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381 ; movff i2c_temp2, SSPBUF ; Data Byte
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382 ; rcall WaitMSSP
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383 ; rcall I2C_WaitforACK
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384 ; bsf SSPCON2,PEN ; Stop condition
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385 ; rcall WaitMSSP
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386 ; return
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387 ;I2C_RX:
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388 ; bcf PIR1,SSPIF
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389 ; bsf SSPCON2,SEN ; Start condition
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390 ; rcall WaitMSSP
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391 ; movlw b'10010001' ; Bit0=0: WRITE, Bit0=1: READ
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392 ; movwf SSPBUF ; control byte
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393 ; rcall WaitMSSP
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394 ; rcall I2C_WaitforACK
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395 ; bsf SSPCON2, RCEN ; Enable recieve mode
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396 ; rcall WaitMSSP
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397 ; movff SSPBUF,i2c_temp2 ; Data Byte
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398 ; bsf SSPCON2,ACKEN ; Master acknowlegde
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399 ; rcall WaitMSSP
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400 ; bsf SSPCON2,PEN ; Stop condition
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401 ; rcall WaitMSSP
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402 ; return