Update cpu_map.h

[PNPMICRO]

No description provided.

[lukasdevilliers]

Can more choices for the laser PWM frequenccy be included in the CPU_map file please. We are noobs regarding this and only three choices are available. Most of the newer high power lasers stipulate 20 khZ. My new laser state clearly 20khZ to work satisfactory, it will not even fire with the 1.98khz available.

[lukasdevilliers]

GRBL 1.1f cpu_map.h file as on my system lines 139 to 143. More choices please. I have noticed a version that have a choice for different frequencies via $33, have not tried it, bit wary of it. Only 7,8; 1.96 and 0.98 currently available. Please assist wit 20khz setting

// Prescaled, 8-bit Fast PWM mode.
#define SPINDLE_TCCRA_INIT_MASK ((1<<WGM20) | (1<<WGM21)) // Configures fast PWM mode.
// #define SPINDLE_TCCRB_INIT_MASK (1<<CS20) // Disable prescaler -> 62.5kHz
#define SPINDLE_TCCRB_INIT_MASK (1<<CS21) // 1/8 prescaler -> 7.8kHz (Used in v0.9)
// #define SPINDLE_TCCRB_INIT_MASK ((1<<CS21) | (1<<CS20)) // 1/32 prescaler -> 1.96kHz
// #define SPINDLE_TCCRB_INIT_MASK (1<<CS22) // 1/64 prescaler -> 0.98kHz (J-tech laser)