AN2367 Freescale Semiconductor / Motorola, AN2367 Datasheet - Page 13

• Manufacturer Part Number: AN2367
• Description: Using the Multiphase Motor Commutation TPU Function (COMM)with the MPC500 Family
• Manufacturer: Freescale Semiconductor / Motorola

COMM Function Example
/*
/*
/*
/*
*/
/* The following loop of code is intended to demonstrate the operation of the
13
HALLD and COMM functions operating together. It will drive state values
onto the QADC_A PORTQA[0..2] pins. If these are connected to the HALLD
input channels(A, B and C], the HALLD function decodes the state values and
supplies the decoded state number to the COMM function which in turn drives
the appropriate commutation state value onto the TPU COMM channels */
force STATE_0 for COMM function on tpua, master channel 8 */
tpu_comm_force_state(tpua, 8, 0);
tpu_halld_init(tpua, 3, HALLD_DIRECTION_0, 0x0083,
HALLD_THREE_CHANNEL_MODE);
tpu_halld_enable(tpua, 3, TPU_PRIORITY_MIDDLE);
enable COMM function master channel (8) for middle priority */
tpu_enable(tpua, 8, TPU_PRIORITY_MIDDLE);
wait for end of service (force_state) */
while(tpu_get_hsr(tpua, 8)!=0);
set up HALLD function for 3 channel mode using channels 3, 4 and 5
initial value of DIRECTION = 0, state_no_address is set to 0x0083
to place the decoded STATE_NO value from HALLD into the required COMM
RAM location for STATE_NO
QADC_A.PORTQA.R = 0;
QADC_A.DDRQA.R = 0xFF00;
while(1)
{
tpu_halld_set_direction(tpua, 3, HALLD_DIRECTION_0);
for (state = 0; state < 8; state++)
{
Using the Multiphase Motor Commutation TPU Function
Freescale Semiconductor, Inc.
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