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samd/machine_dac: Fix SAMD51 DAC for two channels.

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Improvements to DAC support for SAMD51:
- properly validate DAC id
- correctly use dac_init flag, as a 2-ple for A0, A1 channels
- disable DAC before adjusting settings, see SAMD5x data sheet §47.6.2.3

Co-authored-by: robert-hh <robert@hammelrath.com>
Signed-off-by: Graeme Winter <graeme.winter@gmail.com>
This commit is contained in:
Graeme Winter
2023-03-23 05:20:46 +00:00
committed by Damien George
parent 1100aa63c9
commit 70b95d8f93
1 changed files with 37 additions and 17 deletions
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54
ports/samd/machine_dac.c
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@@ -72,7 +72,8 @@ static uint8_t dac_vref_table[] = {
#define MAX_DAC_VALUE (4095)
#define DEFAULT_DAC_VREF (2)
#define MAX_DAC_VREF (3)
static bool dac_init = false;
static bool dac_init[2] = {false, false};
#endif
@@ -91,10 +92,10 @@ static mp_obj_t dac_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_
uint8_t id = args[ARG_id].u_int;
dac_obj_t *self = NULL;
if (0 <= id && id <= MP_ARRAY_SIZE(dac_obj)) {
if (0 <= id && id < MP_ARRAY_SIZE(dac_obj)) {
self = &dac_obj[id];
} else {
mp_raise_ValueError(MP_ERROR_TEXT("invalid Pin for DAC"));
mp_raise_ValueError(MP_ERROR_TEXT("invalid id for DAC"));
}
uint8_t vref = args[ARG_vref].u_int;
@@ -102,9 +103,10 @@ static mp_obj_t dac_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_
self->vref = vref;
}
Dac *dac = dac_bases[0]; // Just one DAC
Dac *dac = dac_bases[0]; // Just one DAC register block
// initialize DAC
// Init DAC
#if defined(MCU_SAMD21)
// Configuration SAMD21
@@ -127,21 +129,39 @@ static mp_obj_t dac_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_
// Configuration SAMD51
// Enable APBD clocks and PCHCTRL clocks; GCLK3 at 8 MHz
dac_init = true;
MCLK->APBDMASK.reg |= MCLK_APBDMASK_DAC;
GCLK->PCHCTRL[DAC_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK3 | GCLK_PCHCTRL_CHEN;
// Reset DAC registers
dac->CTRLA.bit.SWRST = 1;
while (dac->CTRLA.bit.SWRST) {
}
dac->CTRLB.reg = DAC_CTRLB_REFSEL(dac_vref_table[self->vref]);
dac->DACCTRL[self->id].reg = DAC_DACCTRL_ENABLE | DAC_DACCTRL_REFRESH(2) | DAC_DACCTRL_CCTRL_CC12M;
if (!(dac_init[0] | dac_init[1])) {
MCLK->APBDMASK.reg |= MCLK_APBDMASK_DAC;
GCLK->PCHCTRL[DAC_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK3 | \
GCLK_PCHCTRL_CHEN;
// Reset DAC registers
dac->CTRLA.bit.SWRST = 1;
while (dac->CTRLA.bit.SWRST) {
}
dac->CTRLB.reg = DAC_CTRLB_REFSEL(dac_vref_table[self->vref]);
// Enable DAC and wait to be ready
dac->CTRLA.bit.ENABLE = 1;
while (dac->SYNCBUSY.bit.ENABLE) {
}
// Modify DAC config - requires disabling see Section 47.6.2.3 of data sheet
if (!dac_init[self->id]) {
// Disable DAC and wait
dac->CTRLA.bit.ENABLE = 0;
while (dac->SYNCBUSY.bit.ENABLE) {
}
// Modify configuration
dac->DACCTRL[self->id].reg = DAC_DACCTRL_ENABLE | \
DAC_DACCTRL_REFRESH(2) | DAC_DACCTRL_CCTRL_CC12M;
dac->DATA[self->id].reg = 0;
dac_init[self->id] = true;
// Enable DAC and wait
dac->CTRLA.bit.ENABLE = 1;
while (dac->SYNCBUSY.bit.ENABLE) {
}
}
#endif
// Set the port as given in self->gpio_id as DAC