Hi now I'm testing the DAC module, and I'm having the same problem I had with the ADC.
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#include "ch.h"
#include "hal.h"
#define DAC_BUFFER_SIZE 360
/*
* DAC test buffer (sine wave).
*/
static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
0, 2082, 2118, 2154, 2189, 2225, 2260, 2296, 2331, 2367, 2402, 2437,
2472, 2507, 2542, 2576, 2611, 2645, 2679, 2713, 2747, 2780, 2813, 2846,
2879, 2912, 2944, 2976, 3008, 3039, 3070, 3101, 3131, 3161, 3191, 3221,
3250, 3278, 3307, 3335, 3362, 3389, 3416, 3443, 3468, 3494, 3519, 3544,
3568, 3591, 3615, 3637, 3660, 3681, 3703, 3723, 3744, 3763, 3782, 3801,
3819, 3837, 3854, 3870, 3886, 3902, 3917, 3931, 3944, 3958, 3970, 3982,
3993, 4004, 4014, 4024, 4033, 4041, 4049, 4056, 4062, 4068, 4074, 4078,
4082, 4086, 4089, 4091, 4092, 4093, 4094, 4093, 4092, 4091, 4089, 4086,
4082, 4078, 4074, 4068, 4062, 4056, 4049, 4041, 4033, 4024, 4014, 4004,
3993, 3982, 3970, 3958, 3944, 3931, 3917, 3902, 3886, 3870, 3854, 3837,
3819, 3801, 3782, 3763, 3744, 3723, 3703, 3681, 3660, 3637, 3615, 3591,
3568, 3544, 3519, 3494, 3468, 3443, 3416, 3389, 3362, 3335, 3307, 3278,
3250, 3221, 3191, 3161, 3131, 3101, 3070, 3039, 3008, 2976, 2944, 2912,
2879, 2846, 2813, 2780, 2747, 2713, 2679, 2645, 2611, 2576, 2542, 2507,
2472, 2437, 2402, 2367, 2331, 2296, 2260, 2225, 2189, 2154, 2118, 2082,
2047, 2012, 1976, 1940, 1905, 1869, 1834, 1798, 1763, 1727, 1692, 1657,
1622, 1587, 1552, 1518, 1483, 1449, 1415, 1381, 1347, 1314, 1281, 1248,
1215, 1182, 1150, 1118, 1086, 1055, 1024, 993, 963, 933, 903, 873,
844, 816, 787, 759, 732, 705, 678, 651, 626, 600, 575, 550,
526, 503, 479, 457, 434, 413, 391, 371, 350, 331, 312, 293,
275, 257, 240, 224, 208, 192, 177, 163, 150, 136, 124, 112,
101, 90, 80, 70, 61, 53, 45, 38, 32, 26, 20, 16,
12, 8, 5, 3, 2, 1, 0, 1, 2, 3, 5, 8,
12, 16, 20, 26, 32, 38, 45, 53, 61, 70, 80, 90,
101, 112, 124, 136, 150, 163, 177, 192, 208, 224, 240, 257,
275, 293, 312, 331, 350, 371, 391, 413, 434, 457, 479, 503,
526, 550, 575, 600, 626, 651, 678, 705, 732, 759, 787, 816,
844, 873, 903, 933, 963, 993, 1024, 1055, 1086, 1118, 1150, 1182,
1215, 1248, 1281, 1314, 1347, 1381, 1415, 1449, 1483, 1518, 1552, 1587,
1622, 1657, 1692, 1727, 1763, 1798, 1834, 1869, 1905, 1940, 1976, 2012
};
/*
* DAC streaming callback.
*/
size_t nx = 0, ny = 0, nz = 0;
static void end_cb1(DACDriver *dacp, const dacsample_t *buffer, size_t n) {
(void)dacp;
nz++;
if (dac_buffer == buffer) {
nx += n;
}
else {
ny += n;
}
palToggleLine(LINE_LED3);
}
/*
* DAC error callback.
*/
static void error_cb1(DACDriver *dacp, dacerror_t err) {
(void)dacp;
(void)err;
chSysHalt("DAC failure");
}
static const DACConfig dac1cfg1 = {
.init = 2047U,
.datamode = DAC_DHRM_12BIT_RIGHT
};
static const DACConversionGroup dacgrpcfg1 = {
.num_channels = 1U,
.end_cb = end_cb1,
.error_cb = error_cb1,
.trigger = DAC_TRG_SW
};
/*
* GPT6 configuration.
*/
static const GPTConfig gpt6cfg1 = {
.frequency = 1000000U,
.callback = NULL,
.cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
.dier = 0U
};
/*
* Application entry point.
*/
int main(void) {
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
chSysInit();
/*
* Starting DAC1 driver, setting up the output pin as analog as suggested
* by the Reference Manual.
*/
palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
dacStart(&DACD1, &dac1cfg1);
/*
* Starting GPT6 driver, it is used for triggering the DAC.
*/
gptStart(&GPTD6, &gpt6cfg1);
/*
* Starting a continuous conversion.
*/
dacStartConversion(&DACD1, &dacgrpcfg1, dac_buffer, DAC_BUFFER_SIZE);
gptStartContinuous(&GPTD6, 2U);
/*
* Normal main() thread activity
*/
while (true) {
chThdSleepMilliseconds(500);
}
return 0;
}
The DAC output has 1.64 V (more or less) fixed, and it should be a sinusoidal wave. I thought that maybe the DAC was only taking the first value of the array, so i changed it just to see the output and it remained fixed at 1.64.
