很好powerpc源码，从事汽车ecu开发的值得一看，本部分为etpu部分源码....zip

/******************************************************************************* * FILE NAME: etpu_pwmmdc.c COPYRIGHT (c) Freescale Semiconductor 2005 * All Rights Reserved * * DESCRIPTION: * This file contains the eTPU function PWM Master For DC Motors (PWMMDC), * PWM Full Range (PWMF) and PWM Commutated (PWMC) API. ================================================================================ * REV AUTHOR DATE DESCRIPTION OF CHANGE * --- ----------- ---------- --------------------- * 2.0 M. Brejl 02/Mar/05 Initial version derived from PWMM func. * M. Princ * 2.1 M. Brejl 22/Mar/05 New PWMMDC API state flow: * M. Princ init -> enable <-> disable. *******************************************************************************/ #include "etpu_util.h" /* Utility routines for working with the eTPU */ #include "etpu_pwmmdc.h" /* eTPU PWMMDC API */ extern uint32_t fs_etpu_data_ram_start; /******************************************************************************* *FUNCTION : fs_etpu_pwmmdc_init_3ph *PURPOSE : To initialize eTPU channels to implement PWMMDC with 3 phases. *INPUTS NOTES : This function has 20 parameters: * channel - This is the PWMMDC master channel number. * 0-31 for ETPU_A and 64-95 for ETPU_B. * priority - This is the priority to assign to the PWMMDC * channel. * This parameter should be assigned a value of: * FS_ETPU_PRIORITY_HIGH, FS_ETPU_PRIORITY_MIDDLE or * FS_ETPU_PRIORITY_LOW. * phaseA_channel - This parameter determines the channel number * of phase A. * 0-31 for ETPU_A and 64-95 for ETPU_B * phaseA_negate_duty - This parameter sets the "Negate duty-cycle" * option. * This parameter should be assigned a value of: * FS_ETPU_PWMMDC_DUTY_POS or * FS_ETPU_PWMMDC_DUTY_NEG * phaseB_channel - This parameter determines the channel number * of phase B. Applies only if num_phases >= 2. * 0-31 for ETPU_A and 64-95 for ETPU_B * phaseB_negate_duty - This parameter sets the "Negate duty-cycle" * option. * This parameter should be assigned a value of: * FS_ETPU_PWMMDC_DUTY_POS or * FS_ETPU_PWMMDC_DUTY_NEG * phaseC_channel - This parameter determines the channel number * of phase C. Applies only if num_phases >= 3. * 0-31 for ETPU_A and 64-95 for ETPU_B * phaseC_negate_duty - This parameter sets the "Negate duty-cycle" * option. * This parameter should be assigned a value of: * FS_ETPU_PWMMDC_DUTY_POS or * FS_ETPU_PWMMDC_DUTY_NEG * modulation - This parameter determines the type of modulation. * This parameter should be assigned a value of: * FS_ETPU_PWMMDC_MOD_NO or * FS_ETPU_PWMMDC_MOD_VOLTAGE_UNSIGNED or * FS_ETPU_PWMMDC_MOD_VOLTAGE_SIGNED or * update - This parameter determines the type of update. * This parameter should be assigned value of * FS_ETPU_PWMMDC_NORMAL or * FS_ETPU_PWMMDC_HALF_CYCLE. * alignment - This parameter determines the type of PWM. * This parameter should be assigned a value of: * FS_ETPU_PWMMDC_EDGE_ALIGNED or * FS_ETPU_PWMMDC_CENTER_ALIGNED * phases_type - This parameter determines the type of all * PWMF or PWMC phases. * This parameter should be assigned a value of: * FS_ETPU_PWMMDC_FULL_RANGE_SINGLE_CHANNELS or * FS_ETPU_PWMMDC_FULL_RANGE_COMPL_PAIRS or * FS_ETPU_PWMMDC_COMMUTATED_SINGLE_CHANNELS or * FS_ETPU_PWMMDC_COMMUTATED_COMPL_PAIRS * swap - This parameter sets the * "Swap dead-time insertion" option. * This parameter should be assigned a value of: * FS_ETPU_PWMMDC_NO_SWAP or * FS_ETPU_PWMMDC_SWAP * base_ch_disable_pin_state - This is the required output state of the base * channel pin, after initialization. * This parameter should be assigned a value of * FS_ETPU_PWMMDC_PIN_LOW or * FS_ETPU_PWMMDC_PIN_HIGH. * compl_ch_disable_pin_state - This is the required output state of the * complementary channel pin, after initialization. * This parameter should be assigned a value of * FS_ETPU_PWMMDC_PIN_LOW or * FS_ETPU_PWMMDC_PIN_HIGH. * This parameter applies only if phase_type is * FS_ETPU_PWMMDC_COMPL_PAIRS. * start_offset - This parameter is used to synchronize * various eTPU functions that generate a signal. * The first PWM period starts start_offset * TCR1 clocks after initialization. * period - This parameter determines the PWM period * as number of TCR1 cycles. * update_time - This parameter determines the time that is * necessary to perform the update of all PWM * phases as number of TCR1 cycles. * dead_time - This parameter determines the dead-time * as number of TCR1 cycles. * min_pw - This parameter determines the minimum pulse * width as number of TCR1 cycles. * *RETURNS NOTES: Error code is channel could not be initialized. Error code that * can be returned are: FS_ETPU_ERROR_VALUE, FS_ETPU_ERROR_MALLOC. *******************************************************************************/ int32_t fs_etpu_pwmmdc_init_3ph( uint8_t channel, uint8_t priority, uint8_t phaseA_channel, uint8_t phaseA_negate_duty, uint8_t phaseB_channel, uint8_t phaseB_negate_duty, uint8_t phaseC_channel, uint8_t phaseC_negate_duty, uint8_t modulation, uint8_t update, uint8_t alignment, uint8_t phases_type, uint8_t swap, uint8_t base_ch_disable_pin_state, uint8_t compl_ch_disable_pin_state, uint24_t start_offset,