FPM(Frequency Pulse Measurement) Problem

youngguekim — Tue, 12 Jan 2016 08:40:09 GMT

I am using etpu_FPM to get a freq for 4 channel

with AN2859SW, I can use a function < fs_etpu_fpm_get_freq >

but i came to get a wrong freq at first time. when There is no input.

For example, I want to put freq values into variable "FREQ "

although I initialize variable "FREQ " at first time, but then. variable "FREQ " is full of unusual value (When No input)

but if input is nomal, variable "FREQ " come to be full of nomal values

I think it is problem about initialization of ram

Here is My code.. Thank you. <fs_etpu_fpm_get_freq(), fs_etpu_init() > are same as AN2859SW

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uint16_t FREQ;

fs_etpu_init( my_etpu_config, (uint32_t *)etpu_code, sizeof(etpu_code),

(uint32_t *)etpu_globals, sizeof(etpu_globals));

err_code = fs_etpu_fpm_init (16,	/* engine: A; channel: 16 */
FS_ETPU_PRIORITY_MIDDLE,	/* priority: Middle */
FS_ETPU_FPM_CONTINUOUS,	/* mode: FS_ETPU_FPM_SINGLE_SHOT */
FS_ETPU_FPM_RISING_EDGE,	/* edge: FS_ETPU_FPM_RISING_EDGE */
FS_ETPU_TCR1,	/* timebase: TCR1 */
1200000);	/* window_size: 1200000 */

if (err_code != 0)

return (16 + 1);

FREQ = fs_etpu_fpm_get_freq(16, 150000000);

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topic FPM(Frequency Pulse Measurement) Problem in MPC5xxx

FPM(Frequency Pulse Measurement) Problem