TPR = (System Clock/(2*( SCL_HP)*SCL_CLK))-1;
TPR = (80 MHz/(2*(2+1)*3330000))-1;
TPR = 3
Write the
I2CMTPR
register with the value of 0x0000.0003.
8.
To send the master code byte, software should place the value of the master code byte into the
I2CMSA register and write the I2CMCS register with the following value depending on the
required operation:
■ For Standard High-Speed mode, the
I2CMCS
register should be written with 0x13.
■ For Burst High-Speed mode, the
I2CMCS
register should be written with 0x50.
9.
This places the I2C master peripheral in High-speed mode, and all subsequent transfers (until
STOP) are carried out at High-speed data rate using the normal
I2CMCS
command bits, without
setting the
HS
bit in the
I2CMCS
register.
10.
The transaction is ended by setting the
STOP
bit in the
I2CMCS
register.
11.
Wait until the transmission completes by polling the
I2CMCS
register's
BUSBSY
bit until it has
been cleared.
12.
Check the
ERROR
bit in the
I2CMCS
register to confirm the transmit was acknowledged.
18.5
Register Map
Table 18-4 on page 1300 lists the I
2
C registers. All addresses given are relative to the I
2
C base address:
■ I
2
C 0: 0x4002.0000
■ I
2
C 1: 0x4002.1000
■ I
2
C 2: 0x4002.2000
■ I
2
C 3: 0x4002.3000
■ I
2
C 4: 0x400C.0000
■ I
2
C 5: 0x400C.1000
■ I
2
C 6: 0x400C.2000
■ I
2
C 7: 0x400C.3000
■ I
2
C 8: 0x400B.8000
■ I
2
C 9: 0x400B.9000
Note that the I
2
C module clock must be enabled before the registers can be programmed (see
page 391). There must be a delay of 3 system clocks after the I
2
C module clock is enabled before
any I
2
C module registers are accessed.
The hw_i2c.h file in the TivaWare
™
Driver Library uses a base address of 0x800 for the I
2
C slave
registers. Be aware when using registers with offsets between 0x800 and 0x818 that TivaWare™
for C Series uses an offset between 0x000 and 0x018 with the slave base address.
1299
June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
