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comparison src/i2c.asm @ 657:c2e97f94c55f default tip

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bump to 10.93 / 3.32
author heinrichsweikamp
date Tue, 27 Jan 2026 11:01:04 +0100
parents 8af5aefbcdaf
children
comparison
equal deleted inserted replaced
656:8af5aefbcdaf 657:c2e97f94c55f
996 global I2CReset 996 global I2CReset
997 I2CReset: 997 I2CReset:
998 clrf SSP1CON1 ; reset entire module 998 clrf SSP1CON1 ; reset entire module
999 clrf SSP1CON2 ; ... 999 clrf SSP1CON2 ; ...
1000 clrf SSP1STAT ; ... 1000 clrf SSP1STAT ; ...
1001 bcf TRISC,3 ; SCL as OUTPUT 1001 bcf TRISC,3 ; SCL as OUTPUT
1002 bsf TRISC,4 ; SDA as input 1002 bsf TRISC,4 ; SDA as input
1003 bcf PORTC,3 ; SCL = 0 1003 bcf PORTC,3 ; SCL = 0
1004 movlw d'9' ; clock-out 9 clock cycles manually 1004 movlw d'9' ; clock-out 9 clock cycles manually
1005 movwf i2c_temp1 ; ... 1005 movwf i2c_temp1 ; ...
1006 I2CReset_1: 1006 I2CReset_1:
1007 bsf PORTC,3 ; SCL = 1 1007 bsf PORTC,3 ; SCL = 1
1008 nop ; pause for 4 CPU cycles 1008 nop ; pause for 4 CPU cycles
1009 nop ; ... 1009 nop ; ...
1010 nop ; ... 1010 nop ; ...
1011 nop ; ... 1011 nop ; ...
1012 btfsc PORTC,4 ; SDA = 1 ? 1012 btfsc PORTC,4 ; SDA = 1 ?
1013 bra I2CReset_2 ; YES - SDA has been released from slave 1013 bra I2CReset_2 ; YES - SDA has been released from slave
1014 bcf PORTC,3 ; NO - set SCL = 0 1014 bcf PORTC,3 ; NO - set SCL = 0
1015 nop ; - pause for 2 CPU cycles 1015 nop ; - pause for 2 CPU cycles
1016 nop ; - ... 1016 nop ; - ...
1017 bcf PORTC,3 ; - SCL = 0 1017 bcf PORTC,3 ; - SCL = 0
1018 nop ; - pause for 2 CPU cycles 1018 nop ; - pause for 2 CPU cycles
1019 nop ; - ... 1019 nop ; - ...
1020 decfsz i2c_temp1,F ; - clock counter, all cycles done? 1020 decfsz i2c_temp1,F ; - clock counter, all cycles done?
1021 bra I2CReset_1 ; NO - loop 1021 bra I2CReset_1 ; NO - loop
1022 I2CReset_2: 1022 I2CReset_2:
1023 bsf TRISC,3 ; SCL as input 1023 bsf TRISC,3 ; SCL as input
1024 clrf SSP1CON1 ; setup I2C mode 1024 clrf SSP1CON1 ; setup I2C mode
1025 rcall I2C_WAIT_100US ; ISR-Safe 100µs wait 1025 rcall I2C_WAIT_100US ; ISR-Safe 100µs wait
1026 movlw b'00000000' ; enable slew rate control 1026 movlw b'00000000' ; enable slew rate control
1027 movwf SSP1STAT ; ... 1027 movwf SSP1STAT ; ...
1028 movlw b'00101000' ; configure I2C module 1028 movlw b'00101000' ; configure I2C module
1030 movlw b'00000000' ; ... 1030 movlw b'00000000' ; ...
1031 movwf SSP1CON2 ; ... 1031 movwf SSP1CON2 ; ...
1032 movlw i2c_speed_value 1032 movlw i2c_speed_value
1033 movwf SSP1ADD ; ... 1033 movwf SSP1ADD ; ...
1034 rcall I2C_WAIT_100US ; ISR-Safe 100µs wait 1034 rcall I2C_WAIT_100US ; ISR-Safe 100µs wait
1035 banksel i2c_error_counter
1035 movlw .1 1036 movlw .1
1036 addwf i2c_error_counter+0 1037 addwf i2c_error_counter+0,F
1037 movlw .0 1038 movlw .0
1038 addwfc i2c_error_counter+1 ; +1 on the error counter 1039 addwfc i2c_error_counter+1,F ; +1 on the error counter
1040 banksel common
1039 btfss press_sensor_type ; =1: pressure sensor MS5837, =0: Pressure sensor MS5541 1041 btfss press_sensor_type ; =1: pressure sensor MS5837, =0: Pressure sensor MS5541
1040 return ; MS5541, Done. 1042 return ; MS5541, Done.
1043 btfss i2c_reinit_sensor2 ; Sensor ok?
1044 return ; Yes, Done.
1041 ; reset the sensor 1045 ; reset the sensor
1042 rcall I2C_SEN ; start condition 1046 rcall I2C_SEN ; start condition
1043 movlw 0xEC ; address byte + write bit 1047 movlw 0xEC ; address byte + write bit
1044 rcall I2C_TX ; send byte 1048 rcall I2C_TX ; send byte
1045 movlw 0x1E 1049 movlw 0x1E
1046 rcall I2C_TX ; send byte 1050 rcall I2C_TX ; send byte
1047 rcall I2C_PEN ; stop condition 1051 rcall I2C_PEN ; stop condition
1048 WAITMS .5 ; 2.8ms according to datasheet 1052 movlw .50
1053 movwf i2c_temp1
1054 I2CReset_3:
1055 rcall I2C_WAIT_100US ; ISR-Safe 100µs wait
1056 decfsz i2c_temp1,F
1057 bra I2CReset_3 ; ~5ms delay
1058 ; WAITMS .5 ; 2.8ms according to datasheet
1049 return ; done 1059 return ; done
1050 1060
1051 1061
1052 ;----------------------------------------------------------------------------- 1062 ;-----------------------------------------------------------------------------
1053 ; Helper Function - Initialize Gauge IC again after an UVLO Event 1063 ; Helper Function - Initialize Gauge IC again after an UVLO Event