BCM92073x periodic interrupt rate

Anonymous · ‎Nov 17, 2014

I'm new to this product so I apologize in advance if I'm missing something obvious.

I have an application where I need a period interrupt at around 1 KHz, (1 ms or so). I don't see an obvious way to generate this. The fine-time timer provided by the ble_ interface seems to have 12.5 ms resolution.

To take a step back, as there may be another approach: I'm trying to generate a couple PWM waveforms with a period of 25 Hz, (40 ms). The slowest clock to the PWM hardware seems to be 128 KHz, and the PWM hardware has only a 10 bit counter...which gets me a 5 ms period. Not quite slow enough!

Any thoughts are greatly appreciated.

Or a dope slap, that's even better, actually.

Thanks

ZhaohuaS_76 · ‎Nov 19, 2014

Hi damaiano,

please refert to following the code to generate about 25Hz PWM.

aclk_configure(25500, ACLK1, ACLK_FREQ_24_MHZ);

pwm_start(PWM2, PMU_CLK, 0x200, 0);

gpio_configurePin((GPIO_PIN_LED) / 16, (GPIO_PIN_LED) % 16, (2 << 4), 0);

BTW, the ACLK_FREQ_24_MHZ will no function when 2073x is sleep, so you must use the function devlpm_registerForLowPowerQueries to let 2073x keep awake.

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BCM92073x periodic interrupt rate

BCM92073x periodic interrupt rate

Re: BCM92073x periodic interrupt rate