MSP430FR2476: msp430fr2476

luigi Quaglia said:

UCBxCTL1 |= UCSWRST; // eUSCI_B in reset state

That will never work since the reset bit is in CTL0. Also, use "=" instead of "|=" to make sure all the bits are reset before or'ing stuff into it. They aren't all cleared during reset.

Hi David 

sorry But I didn't Understand,

the UCSWRST is in the register UCB1CTLW0 

use "=" instead of "|="

this is example into the data sheet, 

UCBxCTL1 |= UCSWRST; // eUSCI_B in reset state
UCBxCTLW0 |= UCMODE_3; // I2C slave mode
UCBxI2COA0 = 0x0012; // own address is 12hex
P2SEL |= 0x03; // configure I2C pins (device specific)

UCBxCTL1 &= ^UCSWRST; // eUSCI_B in operational state

I program in assembler and I set and reset the bit in assembler see below 

this is my firmware and assembler manipolation bits

               bis.w        #UCSWRST,UCB0CTLW0 
               bis.w        #( UCMODE_3+UCMST+UCSYNC),UCB0CTLW0 
               MOV.W    #I2SPEED_100KHZ,UCB0BRW 
               bic.w        #UCSWRST,UCB0CTLW0 

if I try to set or reset the bit into the register in the byte access and not in word access 

the byte are not changed 

example:  

               bis.b        #UCSWRST,UCB0CTL0 
               bis.b        #( UCMODE_3+UCMST+UCSYNC),UCB0CTL1   ;* this bit are not changed 
               MOV.W    #I2SPEED_100KHZ,UCB0BRW 
               bic.b        #UCSWRST,UCB0CTL0 

Luigi 

luigi Quaglia said:

bis.b        #( UCMODE_3+UCMST+UCSYNC),UCB0CTL1   ;* this bit are not changed 

You keep jumping around. In the previous example you wrote to CTL0 but here write just to the lower half of CTL1. Where none of these settings reside. It wouldn't work on CTL0 either since the UCMODE bits are in the upper 8 bits of that register.

Both CTL0 and CTL1 are 16 bit registers. If for some reason you need to access the upper or lower byte only, the correct symbols to use have an "_L" or "_H" appended.

> bis.b #(SCL+SDA),P4SEL0

P4.6/P4.5 refer to UCB0SDA/SCL (assuming .USCIB0RMP=1).  UCB1SDA/SCL are on P3.2/P3.6 (assuming USCIB1RMP=0). [Ref data sheet (SLASEO7C) Tables 9-11 and 9-25]

Where are your wires connected?

DAVID 

can you send me the example to set up this register ?

I used the name of the register that are reported on the data sheet, and I have  try to access   in byte and word but is the same 

the register are defined in the data sheet as following (page 648 SLAU445I)

00h UCBxCTLW0 eUSCI_Bx Control Word 0 Read/write Word 01C1h Section 24.4.1
00h UCBxCTL1 eUSCI_Bx Control 1 Read/write Byte C1h
01h UCBxCTL0 eUSCI_Bx Control 0 Read/write Byte 01h

I see that  UCBxCTL1 is a lower byte  LSB bit 0-7 

and  UCBxCTL0 is a higher byte but MSB bit 8-15

 I see now in the file MSp430fr2476.cmd that this register are defined 

UCA0CTLW0 = 0x0500;
UCA0CTLW0_L = 0x0500;
UCA0CTLW0_H = 0x0501;

and in the file MSp430fr2476.h are define 

SFR_16BIT(UCB0CTLW0); /* eUSCI_Bx Control Word Register 0 */
SFR_8BIT(UCB0CTLW0_L);
SFR_8BIT(UCB0CTLW0_H);

so the  UCB0CTL1 and UCB0CTL0 are not define anywhere why the compiler don't show the alarm? 

are define so in the manual normally the manual and the definition have the same name 

I will try tomorrow to access with  UCA0CTLW0_L ,UCA0CTLW0_H  and see if are ok 

Thank you 

Luigi 

Bruce 

The UCB0SDA/SCL is also on the P4.3 SCL   and P4.4 SDA I'm using this port 

David 

I have try again this morning the followig combination without succes, when is enable the I2c 

immediately is set the Busy Bit 

if during process before delete the bit  #UCSWRST I delete the bit UCMODE_3 the bit Busy is not 

set.

this procedure is also put immediately under the pinout configuration so no other configuration are 

enabled  

main_program:

             movx.w #STACK_POINTER,SP 

             mov.w #(FRCTLPW+NWAITS_1),FRCTL0
             mov.w #(FRWPPW+DFWP+PFWP),SYSCFG0 

              mov.b #10000000b,P1OUT 
              mov.b #00000000b,P2OUT 
              mov.b #00000010b,P3OUT 
              mov.b #00000101b,P4OUT 
              mov.b #10000110b,P5OUT 
              mov.b #00000000b,P6OUT 
              mov.b #11111111b,P1DIR 
              mov.b #11111111b,P2DIR 
              mov.b #11111111b,P3DIR 
              mov.b #11011010b,P4DIR
              mov.b #01111111b,P5DIR 
              mov.b #11111111b,P6DIR

 
              bis.w #UCSWRST,UCB1CTLW0
              bis.w #(UCMODE_3+UCMST+UCSYNC),UCB1CTLW0_H
              bis.w #(UCSSEL0+UCSSEL1),UCB1CTLW0_L
              mov.w #160,UCB1BRW
              bis.b #(SCL+SDA),P4SEL0
              bic.w #UCSWRST,UCB1CTLW0

              bis.w #UCSWRST,UCB1CTLW0
              bis.b #(UCMODE_3+UCMST+UCSYNC),UCB1CTLW0_H
              bis.b #(UCSSEL0+UCSSEL1),UCB1CTLW0_L
              mov.w #160,UCB1BRW
              bis.b #(SCL+SDA),P4SEL0
              bic.w #UCSWRST,UCB1CTLW0

              bis.b #UCSWRST,UCB1CTLW0_L
              bis.b #(UCMODE_3+UCMST+UCSYNC),UCB1CTLW0_H
              bis.b #(UCSSEL0+UCSSEL1),UCB1CTLW0_L
              mov.w #160,UCB1BRW
              bis.b #(SCL+SDA),P4SEL0
              bic.b #UCSWRST,UCB1CTLW0_L

Luigi 

I see three slightly different version of init code. All are wrong but which one are you using?

If you want to use the P4.3/P4.4 pins for UCB1, you need to set SYSCFG3:USCIB1RMP=1.[Ref data sheet Table 9-11 Note (2) and user guide Table 1-32]

hi Bruce 

done set bit SYSCFG3:USCIB1RMP=1  but nothing is changed , always is switched on the bit Busy 

can you send me I correct configuretion that you are sure that is correct? 

I have try a lot of different configuration but nothing, I don't know were is the error 

Luigi 

Hi David 

I have test all this combination and also the combination on the top but not is changed 

I have also set the bit SYSCFG3:USCIB1RMP=1 as told me bruce but nothing is changed 

can you send me I correct configuretion that you are sure that is correct? 

I have try a lot of different configuration but nothing, I don't know were is the error 

Luigi 

I don't have fix this issue jet have yuo some tested ans sure initialization for I2cbus B1? 

I don't have fix this issue jet have yuo some tested ans sure initialization for I2cbus B1? 

I pasted your code into the assembly template, and inserted this just before the UCB1 setup (which I expect you already have/don't need):

SDA	.set BIT4    ; P4.4=UCB1SDA
SCL	.set BIT3	; P4.3=UCB1SCL
			bis.w #USCIB1RMP,SYSCFG3  	; Use the P4 pins for UCB1
			bic.b #(SCL+SDA),P4DIR		; Input again
			bis.b #(SCL+SDA),P4OUT		; Cheat on
			bis.b #(SCL+SDA),P4REN		;  the pullups
			bic.w #LOCKLPM5,PM5CTL0		; Engage GPIOs

If I stop after the setup, the UCB1 registers look normal, and UCBBUSY=0. I'm not sure what we're doing differently.

Unsolicited: I also succeeded with this sequence, which I find a little easier to read:

			  mov.w #(UCSWRST+UCMODE_3+UCMST+UCSYNC+UCSSEL0+UCSSEL1),UCB1CTLW0
              mov.w #160,UCB1BRW
              bis.b #(SCL+SDA),P4SEL0
              bic.w #UCSWRST,UCB1CTLW0

Hi Bruce 

I have tested and now working, at the end I think my error was that  during my test, first do not have setting the bit  #USCIB1RMP,SYSCFG3

and later do not using this sequence mov.w #(UCSWRST+UCMODE_3+UCMST+UCSYNC+UCSSEL0+UCSSEL1),UCB1CTLW0

 I have using this configuration 

bis.w #USCIB1RMP,SYSCFG3

bis.w #UCSWRST,UCB1CTLW0

mov.w #(UCMODE_3+UCMST+UCSYNC+UCSSEL0+UCSSEL1),UCB1CTLW0
mov.w #160,UCB1BRW
bis.b #(SCL+SDA),P4SEL0
bic.w #UCSWRST,UCB1CTLW0

with this configuration do not work because maybe don't  accept the bis.w #UCSWRST,UCB1CTLW0 separately 

he work only with following configuration 

bis.w #USCIB1RMP,SYSCFG3

mov.w #(UCSWRST+UCMODE_3+UCMST+UCSYNC+UCSSEL0+UCSSEL1),UCB1CTLW0
mov.w #160,UCB1BRW
bis.b #(SCL+SDA),P4SEL0
bic.w #UCSWRST,UCB1CTLW0

I had try also with this configuration but first do not had changed  the bit #USCIB1RMP,SYSCFG3.

and when have set I using separate setting of bis.w #UCSWRST,UCB1CTLW0

I see that this manipolation is ininfluent; anyway I have during the configuration  

bis.w #USCIB1RMP,SYSCFG3 ; Use the P4 pins for UCB1
bic.b #(SCL+SDA),P4DIR ; Input again
bis.b #(SCL+SDA),P4OUT ; Cheat on
bis.b #(SCL+SDA),P4REN ; the pullups
bic.w #LOCKLPM5,PM5CTL0 ; Engage GPIOs

thank you very much for your support 

Luigi 

1) That first sequence sets UCSWRST in the first instruction, then clears it in the second (and then tries to set some "reset required" fields).

2) Buried in the sequence I added, I engaged the internal pullups on the I2C pins. In my case, I didn't have a bus (and so no pullups) but the internal ones suffice if your bus is slow and your wires aren't too long. Is it possible one of your bus pullups has come loose?

I'm glad you got it working.

1) sure yes I know for this reason I using bis.w bic.w instruction 

bis.w #USCIB1RMP,SYSCFG3

bis.w #(UCSWRST+UCMODE_3+UCMST+UCSYNC+UCSSEL0+UCSSEL1),UCB1CTLW0

but at the same not work, but probably when I using this setting not had set the bit  #USCIB1RMP,SYSCFG3, This I had completely forgot 

2) I have external bus with pullup of  2k2 on the SDA and SCL pin , don't have yet tested this new pcb, but on the old one work at100khz, during my test I have meet 400khz and more without any problem .

Honestly I don't have test all I2Cbus yet but I see that do not set more the Busy Bit and send out the Stop bit righ.

I think that work properly now, the sound is good.

Thank you for your support

Luigi