\
\ driver test : MCLK=24MHz, PL2303CG with shortened cable (20cm), WIFI off, all windows apps closed else Scite and TERATERM.
\ ----------- .
-\ . ┌────────────────────────────────┐
-\ notebook USB to I2C bridge +-- I2C -->| up to 112 I2C_FASTFORTH targets|
+\ RST . ┌────────────────────────────────┐
+\ notebook USB to I2C bridge ┌─┐ +-- I2C -->| up to 112 I2C_FASTFORTH targets|
\ ┌───────────────┐ ╔════════════════════════════════════════════════════════════╗ / ┌───────────────────────────────┐ |
\ | WINDOWS 10 | ║ PL2303GC/HXD/TA launchpad running UARTI2CS ║ +-- I2C -->| MSP430FR4133 @ 1 MHz | |
\ | | ║───────────────┐ ┌────────────────────────────────║ / ┌───────────────────────────────┐ |──┘
\ | | ║───────────────┘ └────────────────────────────────║ └───────────────────────────────┘
\ | | ║ |<- l=20cm->| ║<-l=20cm->|
\ └───────────────┘ ╚════════════════════════════════════════════════════════════╝
-\ |_|
-\ test results : RST
+\ └─┘
+\ test results : SW1
\ ------------
\
-\ Full duplex downloading (+ interpret + compile + execute) CORETEST.4TH to I2C Master target = 625ms/732kBds.
-\ Full duplex downloading (+ interpret + compile + execute) CORETEST.4TH to I2C Slave target = 1047ms/431kBds.
+\ Full duplex downloading (+ interpret + compile + execute) CORETEST.4TH to I2C Master target = 547ms/836kBds.
+\ Full duplex downloading (+ interpret + compile + execute) CORETEST.4TH to I2C Slave target = 1031ms/443kBds.
\ the difference (422 ms) is the effective time of the I2C Half duplex exchange.
-\ [(9 bits / char) + ( 2*START + 2*addr + 1 CTRL_Char + 1 STOP / line )] = [(45763 chars * 9 bits) + (1538 lines * 30 bits)] / 0,422 = 1,085 MHz
-\ ==> I2C effective rate = 109 % of I2C Fast-mode Plus (Fm+).
+\ [(9 bits / char) + ( 2*START + 2*addr + 1 CTRL_Char + 1 STOP / line )] = [(45773 chars * 9 bits) + (1536 lines * 30 bits)] / 0.485 = 507 kHz
\
\ also connected to and tested with another I2C_FastForth target with MCLK = 1MHz (I2C CLK > MCLK !).
\
0<> IF MOV #0,TOS THEN \ if TOS <> 0 (UART TERMINAL), set TOS = 0
MOV TOS,0(PSP)
MOV &VERSION,TOS
- SUB #400,TOS \ FastForth V4.0
+ SUB #401,TOS \ FastForth V4.1
COLON \ ASSEMBLER switch to FORTH with IP backup
$0D EMIT \ return to column 1 without CR
- ABORT" FastForth V4.0 please!"
+ ABORT" FastForth V4.1 please!"
ABORT" <-- Ouch! unexpected I2C_FastForth target!"
RST_RET \ remove the ABORT_UARTI2CS definition before continuing the download.
;
ABORT_UARTI2CS \ run tests
-
+\
\ here is a MARKER definition, used to free the program memory including it, and restoring previous hardware context if any.
- MARKER {UARTI2CS} \ the command : ' <MARKER_definition>, leaves USER_PARAM address on the stack.
-\ &{UARTI2CS}-2 = USER_DOES <-- #REMOVE_U2I addr, the subroutine used to restore the low level environment below:
+ MARKER {UARTI2CS} \ assembly addr = your content
+\ &{UARTI2CS}-2 = USER_PARAM-2 <-- #REMOVE_U2I addr, the subroutine used to restore the low level environment below:
16 ALLOT \ &{UARTI2CS} = USER_PARAM <-- previous &STOP_APP addr
- \ &{UARTI2CS}+2 = USER_PARAM+2 <-- previous &HARD_APP addr
+\ \ &{UARTI2CS}+2 = USER_PARAM+2 <-- previous &HARD_APP addr
\ &{UARTI2CS}+4 = USER_PARAM+4 <-- previous &BACKGRND_APP addr
\ &{UARTI2CS}+6 = USER_PARAM+6 <-- previous &TERM_VEC addr
\ &{UARTI2CS}+8 = USER_PARAM+8 <-- previous &Px_VEC addr
\ local variables : UARTI2CS_ADR=\{UARTI2CS\}\+10; <-- I2C_Slave_Addr<<1
-\ TIMER_CONF=\{UARTI2CS\}\+12 <-- TIM_CTL configuration
-\ COLLISION_DLY=\{UARTI2CS\}\+14; <-- 20 us resolution delay after I2C collision
+\ (defined as is in TIMER_CONF=\{UARTI2CS\}\+12 <-- TIM_CTL configuration
+\ ..\inc\target.pat) COLLISION_DLY=\{UARTI2CS\}\+14; <-- 20 us resolution delay after I2C collision
\ DUPLEX_MODE=\{UARTI2CS\}\+15; <-- flag = 4 --> NOECHO, <> 4 --> ECHO, -1 = I2C link lost
-\ USER_PARAMS[-2...+16[ are initialised by START_U2I and USER_PARAMS[-2...+10[ are restored by REMOVE_U2I.
-
-\ =========================================================================
- CODE LEDS MOV @IP+,PC ENDCODE \ comment this line to remove LEDS option
-\ =========================================================================
-
+\ USER_PARAMS[-2...+16[ are initialised by START_U2I and only USER_PARAMS[-2...+10[ are restored by REMOVE_U2I.
+\
\ -----------------------------------------------------------------------
\ first we download the set of definitions we need (copied from CORE_ANS)
\ -----------------------------------------------------------------------
-\
+
[UNDEFINED] = [IF]
\ https://forth-standard.org/standard/core/Equal
\ = x1 x2 -- flag test x1=x2
ENDCODE
[THEN]
- [UNDEFINED] + [IF] \ for [ABORT, (GEMA pattern)
-\ https://forth-standard.org/standard/core/Plus
-\ + n1/u1 n2/u2 -- n3/u3 add n1+n2
- CODE +
- ADD @PSP+,TOS
- MOV @IP+,PC
- ENDCODE
- [THEN]
-
-\ -----------------------------
-\ end of definitions we need...
-\ -----------------------------
-\
[UNDEFINED] TSTBIT [IF]
CODE TSTBIT \ addr bit_mask -- true/flase flag
MOV @PSP+,X
ENDCODE
[THEN]
+\ -----------------------------
+\ end of definitions we need...
+\ -----------------------------
+\
+\ =========================================================================
+\ CODE LEDS MOV @IP+,PC ENDCODE \ comment/uncomment this line to remove/add LEDS option
+\ =========================================================================
+\
\ see symbolic values in ..\inc\launchpad.pat or/and in ..\inc\device.pat
\ note: HDNCODE definitions are HiDdeN and cannot be called from TERMINAL
\ ------------------------------------\
\ ------------------------------------\
HDNCODE REMOVE_U2I \ REMOVE_APP subroutine
\ ------------------------------------\
-BW1 \ <-- WARM <-- INIT_FORTH <-- SYS_failures|RESET
+BW1 \ <-- WARM <-- INIT_FORTH <-- SYS_failures|software_BOR
\ ------------------------------------\
[DEFINED] LEDS [IF]
BIC.B #LED1,&LED1_OUT \ set TX red led OFF
ENDCODE \
\ ------------------------------------\
-\ ------------------------------------\
+\ ====================================\
HDNCODE STOP_U2I \ new STOP_APP subroutine, defined for the example, not used.
-\ ------------------------------------\
+\ ====================================\
CALL #I2CM_STOP \ send I2C STOP
- MOV &{UARTI2CS},PC \ run previous STOP_APP then RET
+ MOV &OLD_STOP_APP,PC \ run previous STOP_APP then RET
ENDCODE \
\ ------------------------------------\
-\ ------------------------------------\
+\ ====================================\
HDNCODE BACKGRND_U2I \ new BACKGRND_APP subroutine, RET to LPM0 shut down.
-\ ------------------------------------\
+\ ====================================\
\ user request test \
\ ------------------------------------\
BIT #8,&TERM_STATW \ 3 break sent by TERATERM (Alt+B) ?
- 0<> IF
- MOV #WARM_IP_ADR,0(RSP) \ replace BACKGRND_U2I return by INIT_FORTH followed by WARM
- PUSH #INIT_FORTH \
-\ ------------------------------------\
-BW2 MOV #1,TOS \ to identify manual request to REMOVE_U2I
+ 0<> ?GOTO FW1
+ BIT.B #SW1,&SW1_IN \ SW1 pressed ?
+ 0= IF \
+FW1 MOV #1,TOS \ to identify human request to REMOVE_U2I
+ MOV #TOS2WARM,0(RSP) \ replace BACKGRND_U2I ret directly by TOS2WARM (no need STOP_APP(I2CM_STOP) )
GOTO BW1 \ 2
- THEN
+ THEN \
\ ------------------------------------\
BIC.B #INT_IN,&INT_IN_IFG \ 4 clear INT_IN IFG
MOV #'CR',S \ 2 S = 'CR' = penultimate char of line to be RXed by UART
MOV #0,T \ 2 T = init buffer pointer for UART_TERMINAL input
MOV.B &DUPLEX_MODE,Y \ 3 Y = 4 ==> NOECHO else ECHO, for U2I_TERM_INT and 500MS_INT use
- MOV &{UARTI2CS}+4,PC \ 3 previous BACKGRND_APP executes RXON, enabling TERMINAL TX, then RET to LPM0 shut down.
+ MOV &OLD_BACKGRND_APP,PC \ 3 previous BACKGRND_APP executes RXON, enabling TERMINAL TX, then RET to BACKGRND.
ENDCODE \
\ ------------------------------------\
-\ ------------------------------------\
+\ ====================================\
HDNCODE HARD_U2I \ new HARD_APP subroutine, RETurn redirected to ABORT --> ACCEPT --> BACKGRND
-\ ------------------------------------\
+\ ====================================\
\ init 500MS_INT \ used to scan I2C_Slave hard RESET and to slow down (re)START RX loop
\ ------------------------------------\
BW3 MOV &TIMER_CONF,&TIM_CTL \ start RX_timer, up mode
\ ------------------------------------\
\ run previous HARD_APP \
\ ------------------------------------\
- CALL &{UARTI2CS}+2 \ execute previous HARD_APP to init TERM_UC, activates I/O.
+ CALL &OLD_HARD_APP \ execute previous HARD_APP to init TERM_UC, activates I/O.
\ ------------------------------------\ TOS = USERSYS=$00|SYSRSTIV=$02|$04|$0E|$xx as UARTI2CS|POWER_ON|RST|SVSH_threshold|SYS_failures
\ define new SYSRSTIV select \
\ ------------------------------------\
- CMP #6,TOS \ SYSRSTIV = RESET ?
- 0= ?GOTO BW2 \ if yes goto REMOVE_U2I with TOS = 1, return to WARM
CMP #$0E,TOS \ SVSHIFG SVSH event = #14 ? (POWER_ON)
0<> IF \ if not
CMP #$0A,TOS \ SYSRSTIV >= violation memory protected areas ?
THEN \
\ ------------------------------------\
MOV #ABORT,0(RSP) \ replace WARM return by ABORT return
- MOV @RSP+,PC \ --> ABORT --> ACCCEPT --> BACKGRND --> LPM4
+ MOV @RSP+,PC \ --> ABORT --> ACCEPT --> BACKGRND --> LPM0
ENDCODE \
\ ------------------------------------\
HDNCODE I2CM_START \ I2C_Master START and TX Address, version with collision detection and resolution
\ ----------------------------------------\ _
BIS.B #SM_SDA,&I2CSM_DIR \ 3 v_ force SDA as output (low)
- BIS &UARTI2CS_ADR,X \ 3 _ X = (Slave_Address<<1 | R/w bit)
+ BIS &UARTI2CS_ADR,X \ 3 _ X = (Slave_Address<<1 + R/w bit)
BIS.B #SM_SCL,&I2CSM_DIR \ 3 v_ force SCL as output (low)
\ ----------------------------------------\
\ I2C_Master Send I2C Addr \
BIT.B #SM_SDA,&I2CSM_IN \ 3 h get SDA input
0= IF \ 2 h
\ ----------------------------\
-\ collision detected \ if SDA input low, collision detected
+\ collision detected \ if SDA input is low, collision detected
\ ----------------------------\
BEGIN \
BIT #TX,&TERM_IFG \ 3
\ ----------------------------\
\ collision resolution \
\ ----------------------------\
- BEGIN \ wait until SDA high
- BIT.B #SM_SDA,&I2CSM_IN \ 3 h
+ BEGIN \
+ BIT.B #SM_SCL,&I2CSM_IN \ 3 h wait while SCL is low (case of I2C_Slave stretching)
0<> UNTIL \ 2
\ ----------------------------\
BEGIN \ wait for 20us bus idle time
- BIC.B #SM_BUS,&I2CSM_IFG \ 4 clear SM_BUS IFG
- NOP3 \ 3
- MOV.B &COLLISION_DLY,W \ 3 load delay value
- BEGIN \
- NOP \ 1
- SUB #1,W \ 1
- 0= UNTIL \ 2 4~ x (delay value)
- BIT.B #SM_BUS,&I2CSM_IFG \ 4
+ BIC.B #SM_BUS,&I2CSM_IFG \ 4 clear SM_BUS IFG
+ NOP3 \ 3
+ MOV.B &COLLISION_DLY,W \ 3 load delay value
+ BEGIN \
+ NOP \ 1
+ SUB #1,W \ 1
+ 0= UNTIL \ 2 4~ x (delay value)
+ BIT.B #SM_BUS,&I2CSM_IFG \ 4
0= UNTIL \ 2 + 16~ dead time for the remainder of idle time
\ ----------------------------\
ADD #2,RSP \ 1 remove the RET for Nack/Ack processing and select..
THEN \ (275 cycles for 500MS_INT)
CMP.B #-1,Y \ 1 l return of I2C_Slave on bus ?
0= IF \ 2 l if yes
- MOV.B #0,Y \ clear 'no_I2C_Slave' flag, ECHO is ON
+ MOV.B #1,&DUPLEX_MODE \ clear 'no_I2C_Slave' flag, ECHO is ON
MOV.B #'CR',&TERM_TXBUF \ send CR+LF to terminal
BEGIN \
BIT #TX,&TERM_IFG \
SUB #1,W \ 1 l count down of bits
0= UNTIL \ 2 l
\ ----------------------------\
-\ case of RX data $FF \ case of -1 SYS for example
+\ case of RX data $FF \ case of I2C_Slave BOR, ABORT request, I2C_BUS lost
\ ----------------------------\
CMP.B #-1,X \ 1 l received char $FF ? let's consider that the slave is lost...
0<> WHILE \ 2 l
0<> UNTIL \ 2 l loop if no
MOV.B X,&TERM_TXBUF \ 3 l send RXed char to UART TERMINAL
THEN \
- REPEAT \ 2 l loop back to RX data
+ REPEAT \ 2 l loop back to RX data for chars {$08...$FF}
\ --------------------------------\
-\ case of RX CTRL_Char {$00...$07}\ here Master holds SCL low, Slave can test it: CMP #8,&TERM_STATW
+\ case of RX CTRL_Char {$00...$07}\ here Master holds SCL low
\ --------------------------------\ see forthMSP430FR_TERM_I2C.asm
CMP.B #4,X \ 1
U>= IF \ 2
MOV.B X,Y \ NOECHO = $04, ECHO = {$05...$07}
+ MOV.B Y,&DUPLEX_MODE \ save NOECHO flag
BIS.B #SM_SDA,&I2CSM_DIR \ 3 l prepare SDA low = Ack for Ctrl_Chars {$04...$07}
THEN \
\ --------------------------------\
BIT.B #SM_SDA,&I2CSM_IN \ 3 h _ get SDA as TX Ack/Nack state
BIS.B #SM_SCL,&I2CSM_DIR \ 3 h v_ SCL as output : force SCL low
\ --------------------------------\
- 0<> UNTIL \ 2 l if Ack, loop back to Master_RX data after CTRL_Chars {$04...$07,$08...$FE}
+ 0<> UNTIL \ 2 l if Ack, loop back to Master_RX data after CTRL_Chars {$04...$07}
\ ------------------------------------\
\ Nack is sent by Master \ case of CTRL-Chars {$FF...$03}, SDA is high, SCL is low
\ ------------------------------------\
U>= WHILE \ l out of loop for CTRL_chars {$00,$01}
\ ------------------------------------\
\ CTRL_Char {$02,$03,$FF} \ only CTRL_Char $FF is used
-\ ------------------------------------\
+\ ------------------------------------\ _
+ BIC.B #SM_SCL,&I2CSM_DIR \ 3 l _^ release SCL (high) to avoid Stretch time out on I2C_Slave side
+ CALL #UART_RXON \ resume UART downloading source file
+ BEGIN \
+ BIC #RX,&TERM_IFG \ clear UCRXIFG
+ MOV &FREQ_KHZ,X \ 1000, 2000, 4000, 8000, 16000, 240000
+ BEGIN MOV #65,W \ 2~ <-------+ wait time for TERMINAL to refill its USB buffer
+ BEGIN SUB #1,W \ 1~ <---+ | ==> ((65*3)+5)*FREQ_KHZ/1000 = 200ms delay
+ 0= UNTIL \ 2~ 3~ loop ---+ |
+ SUB #1,X \ 1~ |
+ 0= UNTIL \ 2~ 200~ loop -----+
+ BIT #RX,&TERM_IFG \ 4 new char in TERMRXBUF during this delay ?
+ 0= UNTIL \ 2 yes, the input stream is still active: loop back
MOV.B #0,Y \ set echo ON
- CALL #UART_RXON \ resume UART downloading source file
- BEGIN \
- BIC #RX,&TERM_IFG \ clear UCRXIFG
- MOV &FREQ_KHZ,X \ 1000, 2000, 4000, 8000, 16000, 240000
- BEGIN MOV #65,W \ 2~ <-------+ wait time for TERMINAL to refill its USB buffer
- BEGIN SUB #1,W \ 1~ <---+ | ==> ((65*3)+5)*FREQ_KHZ/1000 = 200ms delay
- 0= UNTIL \ 2~ 3~ loop ---+ |
- SUB #1,X \ 1~ |
- 0= UNTIL \ 2~ 200~ loop -----+
- BIT #RX,&TERM_IFG \ 4 new char in TERMRXBUF during this delay ?
- 0= UNTIL \ 2 yes, the input stream is still active: loop back
- REPEAT \ l loop back to reSTART RX on WARM|ABORT messages.
+ REPEAT \ l loop back to reSTART RX on WARM|ABORT" messages or I2C_Bus lost.
\ ----------------------------------------\
\ I2C_Master_RX Send STOP \ remainder: CTRL_Chars {$00,$01}
\ ----------------------------------------\
\ I2C_Slave ACCEPT ctrl_char $00 \ case of request by I2C_Slave ACCEPT
\ ----------------------------------------\
0= IF \
- MOV.B Y,&DUPLEX_MODE \ save updated NOECHO flag before RET
MOV #BACKGRND,PC \ which calls BACKGRND_U2I, RXON enabling TERMINAL TX, then LPM0 shut down.
THEN \
\ ----------------------------------------\
\ I2C_address<<1 mini = $10, maxi = $EE (I2C-bus specification and user manual V6)
\ type on TERMINAL "$12 START_U2I" to link teraterm TERMINAL with FastForth I2C_Slave target at address $12
-\ ------------------------------------\
+\ ====================================\
CODE START_U2I \ I2C_Addr<<1 --
-\ ------------------------------------\
+\ ====================================\
SUB #2,PSP \ DUP
MOV TOS,0(PSP) \
COLON \ ASSEMBLER switch to FORTH with IP backup
." Connect to I2C_SLAVE at @" \
. 'BS' EMIT \ display number without space after
." , TERATERM(Alt-B) " \
- ." or I2C_MASTER(RST) to quit..." \
+ ." or I2C_MASTER(SW1) to quit..." \
HI2LO \ FORTH switch to ASSEMBLER
MOV @RSP+,IP \ restore IP
BEGIN \
CMP #RET_ADR,&{UARTI2CS}-2 \ USER_DOES default value ?
0= IF \ if yes
MOV #REMOVE_U2I,&{UARTI2CS}-2 \ USER_DOES of {UARTI2CS} will CALL &{UARTI2CS}-2 = CALL #REMOVE_U2I
- MOV &STOP_APP,&{UARTI2CS} \ save STOP_APP value to {UARTI2CS}
- MOV &HARD_APP,&{UARTI2CS}+2 \ save HARD_APP value to {UARTI2CS}+2
- MOV &BACKGRND_APP,&{UARTI2CS}+4 \ save BACKGRND_APP value to {UARTI2CS}+4
- MOV &TERM_VEC,&{UARTI2CS}+6 \ save TERM_VEC value to {UARTI2CS}+6
- MOV &INT_IN_VEC,&{UARTI2CS}+8 \ save INT_IN_VEC value to {UARTI2CS}+8
+ MOV &STOP_APP,&OLD_STOP_APP \ save previous STOP_APP value to {UARTI2CS}
MOV #STOP_U2I,&STOP_APP \ set STOP_APP with STOP_U2I addr
+ MOV &HARD_APP,&OLD_HARD_APP \ save previous HARD_APP value to {UARTI2CS}+2
MOV #HARD_U2I,&HARD_APP \ set HARD_APP with HARD_U2I addr
+ MOV &BACKGRND_APP,&OLD_BACKGRND_APP \ save previous BACKGRND_APP value to {UARTI2CS}+4
MOV #BACKGRND_U2I,&BACKGRND_APP \ set BACKGRND_APP with BACKGRND_U2I addr
+ MOV &TERM_VEC,&OLD_TERM_VEC \ save previous TERM_VEC value to {UARTI2CS}+6
MOV #U2I_TERM_INT,&TERM_VEC \ set TERM_VEC with U2I_TERM_INT addr
+ MOV &INT_IN_VEC,&OLD_INT_IN_VEC \ save previous INT_IN_VEC value to {UARTI2CS}+8
MOV #500MS_INT,&INT_IN_VEC \ set INT_IN_VEC with 500MS_INT addr
\ --------------------------------\
MOV TOS,&UARTI2CS_ADR \ save I2C_address<<1 at {UARTI2CS}+10
[IF] MOV #76,&COLLISION_DLY \ > set 20us delay = (delay*MHz/4 -4, and set ECHO (<>4)
[ELSE] MOV #36,&COLLISION_DLY \ )
[THEN] \ )
- [THEN] \
+ [THEN] \ here we may add a priority... by slice of 20us
THEN \
MOV #0,TOS \ -- 0 to enter in HARD_U2I with 0 SYS
GOTO BW3 \ goto HARD_U2I as new HARD_APP, direct return to ABORT
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