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Tone.cpp
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#include "Arduino.h"
#include "wiring_private.h"
// only pin 5 and 6 support tone function
#define PWMTMR_TONE (0x104)
#define MAX_TONE_FREQ (100000) //100kHz
static const char *tone_dev = "/dev/pwmtimer";
typedef struct tagTone_Config {
uint8_t pin;
unsigned int clksrc_div;
unsigned int active_cycle;
} Tone_Config,*pTone_Config;
/*
const float pwm_source = 24000000.0;
int pwm_divider[10] = {120, 180, 240, 360, 480, 12000, 24000, 36000, 48000, 72000};
int pwm_max_cycle[10] = {128, 128, 128, 128, 128, 128, 128, 128, 128, 128};
void findPWMSetting(int in_freq, int* pwm_source_div, int* pwm_active_cycle)
{
double need = in_freq;
double delta = in_freq / 100 + 1;
*pwm_source_div = 0;
*pwm_active_cycle = 0;
int i, j;
for(i=0; i<10; i++)
{
for(j=1; j<pwm_max_cycle[i]+1; j++)
{
float freq = pwm_source / (pwm_divider[i] * j * 2);
if( abs(freq - need) < delta )
{
delta = abs(freq - need);
*pwm_source_div = pwm_divider[i];
*pwm_active_cycle = j;
}
}
}
}
*/
struct tone_freq{int f;int div;int cycle;};
struct tone_freq t[]= {
{100000,120,2},
{66667,180,2},
{50000,240,2},
{33333,360,2},
{25000,480,2},
{22222,180,6},
{20000,120,10},
{16667,360,4},
{14286,120,14},
{13333,180,10},
{12500,480,4},
{11111,360,6},
{10000,240,10},
{9524,180,14},
{9091,120,22},
{8333,480,6},
{7692,120,26},
{7407,180,18},
{7143,240,14},
{6667,360,10},
{6250,480,8},
{6061,180,22},
{5882,120,34},
{5556,360,12},
{5263,120,38},
{5128,180,26},
{5000,480,10},
{4762,360,14},
{4545,240,22},
{4444,180,30},
{4348,120,46},
{4167,480,12},
{4000,120,50},
{3922,180,34},
{3846,240,26},
{3704,360,18},
{3571,480,14},
{3509,180,38},
{3448,120,58},
{3333,360,20},
{3226,120,62},
{3175,180,42},
{3125,480,16},
{3030,360,22},
{2941,240,34},
{2899,180,46},
{2857,120,70},
{2778,480,18},
{2703,120,74},
{2667,180,50},
{2632,240,38},
{2564,360,26},
{2500,480,20},
{2469,180,54},
{2439,120,82},
{2381,360,28},
{2326,120,86},
{2299,180,58},
{2273,480,22},
{2222,360,30},
{2174,240,46},
{2151,180,62},
{2128,120,94},
{2083,480,24},
{2041,120,98},
{2020,180,66},
{2000,240,50},
{1961,360,34},
{1923,480,26},
{1905,180,70},
{1887,120,106},
{1852,360,36},
{1818,120,110},
{1802,180,74},
{1786,480,28},
{1754,360,38},
{1724,240,58},
{1709,180,78},
{1695,120,118},
{1667,480,30},
{1639,120,122},
{1626,180,82},
{1613,240,62},
{1587,360,42},
{1563,480,32},
{1550,180,86},
{1538,120,130},
{1515,360,44},
{1493,120,134},
{1481,180,90},
{1471,480,34},
{1449,360,46},
{1429,240,70},
{1418,180,94},
{1408,120,142},
{1389,480,36},
{1370,120,146},
{1361,180,98},
{1351,240,74},
{1333,360,50},
{1316,480,38},
{1307,180,102},
{1299,120,154},
{1282,360,52},
{1266,120,158},
{1258,180,106},
{1250,480,40},
{1235,360,54},
{1220,240,82},
{1212,180,110},
{1205,120,166},
{1190,480,42},
{1176,120,170},
{1170,180,114},
{1163,240,86},
{1149,360,58},
{1136,480,44},
{1130,180,118},
{1124,120,178},
{1111,360,60},
{1099,120,182},
{1093,180,122},
{1087,480,46},
{1075,360,62},
{1064,240,94},
{1058,180,126},
{1053,120,190},
{1042,480,48},
{1031,120,194},
{1026,180,130},
{1020,240,98},
{1010,360,66},
{1000,12000,2},
{995,180,134},
{990,120,202},
{980,360,68},
{971,120,206},
{966,180,138},
{962,480,52},
{952,360,70},
{943,240,106},
{939,180,142},
{935,120,214},
{926,480,54},
{917,120,218},
{913,180,146},
{909,240,110},
{901,360,74},
{893,480,56},
{889,180,150},
{885,120,226},
{877,360,76},
{870,120,230},
{866,180,154},
{862,480,58},
{855,360,78},
{847,240,118},
{844,180,158},
{840,120,238},
{833,480,60},
{826,120,242},
{823,180,162},
{820,240,122},
{813,360,82},
{806,480,62},
{803,180,166},
{800,120,250},
{794,360,84},
{787,120,254},
{784,180,170},
{781,480,64},
{775,360,86},
{769,240,130},
{766,180,174},
{758,480,66},
{749,180,178},
{746,240,134},
{741,360,90},
{735,480,68},
{733,180,182},
{725,360,92},
{717,180,186},
{714,480,70},
{709,360,94},
{704,240,142},
{702,180,190},
{694,480,72},
{687,180,194},
{685,240,146},
{680,360,98},
{676,480,74},
{673,180,198},
{667,360,100},
{660,180,202},
{658,480,76},
{654,360,102},
{649,240,154},
{647,180,206},
{641,480,78},
{635,180,210},
{633,240,158},
{629,360,106},
{625,480,80},
{623,180,214},
{617,360,108},
{612,180,218},
{610,480,82},
{606,360,110},
{602,240,166},
{601,180,222},
{595,480,84},
{590,180,226},
{588,240,170},
{585,360,114},
{581,480,86},
{580,180,230},
{575,360,116},
{570,180,234},
{568,480,88},
{565,360,118},
{562,240,178},
{560,180,238},
{556,480,90},
{551,180,242},
{549,240,182},
{546,360,122},
{543,480,92},
{542,180,246},
{538,360,124},
{533,180,250},
{532,480,94},
{529,360,126},
{526,240,190},
{525,180,254},
{521,480,96},
{515,240,194},
{513,360,130},
{510,480,98},
{505,360,132},
{500,24000,2},
{498,360,134},
{495,240,202},
{490,480,102},
{485,240,206},
{483,360,138},
{481,480,104},
{476,360,140},
{472,480,106},
{469,360,142},
{467,240,214},
{463,480,108},
{459,240,218},
{457,360,146},
{455,480,110},
{450,360,148},
{446,480,112},
{444,360,150},
{442,240,226},
{439,480,114},
{435,240,230},
{433,360,154},
{431,480,116},
{427,360,156},
{424,480,118},
{422,360,158},
{420,240,238},
{417,480,120},
{413,240,242},
{412,360,162},
{410,480,122},
{407,360,164},
{403,480,124},
{402,360,166},
{400,240,250},
{397,480,126},
{394,240,254},
{392,360,170},
{391,480,128},
{388,360,172},
{385,480,130},
{383,360,174},
{379,480,132},
{375,360,178},
{373,480,134},
{370,360,180},
{368,480,136},
{366,360,182},
{362,480,138},
{358,360,186},
{357,480,140},
{355,360,188},
{352,480,142},
{351,360,190},
{347,480,144},
{344,360,194},
{342,480,146},
{340,360,196},
{338,480,148},
{337,360,198},
{333,36000,2},
{330,360,202},
{329,480,152},
{327,360,204},
{325,480,154},
{324,360,206},
{321,480,156},
{317,360,210},
{316,480,158},
{314,360,212},
{313,480,160},
{312,360,214},
{309,480,162},
{306,360,218},
{305,480,164},
{303,360,220},
{301,480,166},
{300,360,222},
{298,480,168},
{295,360,226},
{294,480,170},
{292,360,228},
{291,480,172},
{290,360,230},
{287,480,174},
{285,360,234},
{284,480,176},
{282,360,236},
{281,480,178},
{280,360,238},
{278,480,180},
{275,480,182},
{273,360,244},
{272,480,184},
{271,360,246},
{269,480,186},
{267,360,250},
{266,480,188},
{265,360,252},
{263,480,190},
{262,360,254},
{260,480,192},
{258,480,194},
{255,480,196},
{253,480,198},
{250,48000,2},
{248,480,202},
{245,480,204},
{243,480,206},
{240,480,208},
{238,480,210},
{236,480,212},
{234,480,214},
{231,480,216},
{229,480,218},
{227,480,220},
{225,480,222},
{223,480,224},
{221,480,226},
{219,480,228},
{217,480,230},
{216,480,232},
{214,480,234},
{212,480,236},
{210,480,238},
{208,480,240},
{207,480,242},
{205,480,244},
{203,480,246},
{202,480,248},
{200,12000,10},
{198,480,252},
{197,480,254},
{195,480,256},
{167,72000,2},
{143,12000,14},
{125,48000,4},
{111,36000,6},
{100,24000,10},
{91,12000,22},
{83,72000,4},
{77,12000,26},
{71,24000,14},
{67,36000,10},
{63,48000,8},
{59,12000,34},
{56,72000,6},
{53,12000,38},
{50,48000,10},
{48,36000,14},
{45,24000,22},
{43,12000,46},
{42,72000,8},
{40,12000,50},
{38,24000,26},
{37,36000,18},
{36,48000,14},
{34,12000,58},
{33,72000,10},
{32,12000,62},
{31,48000,16},
{30,36000,22},
{29,24000,34},
{28,72000,12},
{27,12000,74},
{26,36000,26},
{25,48000,20},
{24,72000,14},
{23,48000,22},
{22,36000,30},
{21,72000,16},
{20,36000,34},
{19,72000,18},
{18,48000,28},
{17,72000,20},
{16,48000,32},
{15,72000,22},
{14,72000,24},
{13,72000,26},
{12,72000,28},
{11,72000,30},
{10,72000,34},
{9,72000,38},
{8,72000,44},
{7,72000,50},
{6,72000,60},
{5,72000,74},
{4,72000,94},
{3,72000,132},
{2,72000,222},
{1,72000,256},
};
void findPWMSetting(unsigned int in_freq, unsigned int* pwm_source_div, unsigned int* pwm_active_cycle)
{
int i = 0;
int delta1, delta2;
int size = sizeof(t)/sizeof(tone_freq);
for(i=0; i<size-1; i++)
{
delta1 = t[i].f - in_freq;
if(delta1 < 0)
break;
delta2 = t[i+1].f - in_freq;
if(delta2 < 0)
{
if(abs(delta2) < delta1)
i++;
break;
}
}
*pwm_source_div = t[i].div;
*pwm_active_cycle = t[i].cycle / 2;
}
void tone(uint8_t _pin, unsigned int frequency, unsigned long duration)
{
int ret = -1;
int fd = -1;
Tone_Config toneconfig;
if ( (_pin == 5 || _pin == 6) &&
(frequency >= 0 && frequency <= MAX_TONE_FREQ) )
{
toneconfig.pin = _pin;
if (frequency == 0)
{
toneconfig.clksrc_div = 0;
toneconfig.active_cycle = 0;
}
else
{
findPWMSetting(frequency, &toneconfig.clksrc_div, &toneconfig.active_cycle);
}
//printf("frequency =%d Hz, clk prediv=%d, active_cycle=%d \r\n", frequency, toneconfig.clksrc_div, toneconfig.active_cycle);
fd = open(tone_dev, O_RDONLY);
if (fd < 0)
pabort("open tone device fail");
ret = ioctl(fd, PWMTMR_TONE, &toneconfig);
if (ret < 0)
pabort("can't set PWMTMR_TONE");
if(fd)
close(fd);
}
else
{
fprintf(stderr, "%s ERROR: invalid pin/frequency, pin=%d\n", __FUNCTION__, _pin);
exit(-1);
}
}
void noTone(uint8_t _pin)
{
int ret = -1;
int fd = -1;
Tone_Config toneconfig;
if ( (_pin == 5 || _pin == 6) )
{
toneconfig.pin = _pin;
toneconfig.clksrc_div = 0;
toneconfig.active_cycle = 0;
fd = open(tone_dev, O_RDONLY);
if (fd < 0)
pabort("open tone device fail");
ret = ioctl(fd, PWMTMR_TONE, &toneconfig);
if (ret < 0)
pabort("can't set PWMTMR_TONE");
if(fd)
close(fd);
}
else
{
fprintf(stderr, "%s ERROR: invalid pin, pin=%d\n", __FUNCTION__, _pin);
exit(-1);
}
}