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busio/I2C: Split out samd_i2c_get_sercom()

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It will be shared with I2CSlave.
This commit is contained in:
Noralf Trønnes 2018-07-25 22:25:18 +02:00
parent 5f08ebdfc8
commit b6822b86ac
2 changed files with 31 additions and 26 deletions
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54
ports/atmel-samd/common-hal/busio/I2C.c
View File

@ -39,39 +39,41 @@
// Number of times to try to send packet if failed.
#define ATTEMPTS 2
Sercom *samd_i2c_get_sercom(const mcu_pin_obj_t* scl, const mcu_pin_obj_t* sda,
uint8_t *sercom_index, uint32_t *sda_pinmux, uint32_t *scl_pinmux) {
*sda_pinmux = 0;
*scl_pinmux = 0;
for (int i = 0; i < NUM_SERCOMS_PER_PIN; i++) {
*sercom_index = sda->sercom[i].index;
if (*sercom_index >= SERCOM_INST_NUM) {
continue;
}
Sercom* potential_sercom = sercom_insts[*sercom_index];
if (potential_sercom->I2CM.CTRLA.bit.ENABLE != 0 ||
sda->sercom[i].pad != 0) {
continue;
}
*sda_pinmux = PINMUX(sda->number, (i == 0) ? MUX_C : MUX_D);
for (int j = 0; j < NUM_SERCOMS_PER_PIN; j++) {
if (*sercom_index == scl->sercom[j].index &&
scl->sercom[j].pad == 1) {
*scl_pinmux = PINMUX(scl->number, (j == 0) ? MUX_C : MUX_D);
return potential_sercom;
}
}
}
return NULL;
}
void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
const mcu_pin_obj_t* scl, const mcu_pin_obj_t* sda, uint32_t frequency, uint32_t timeout) {
#ifdef PIRKEY_M0
mp_raise_NotImplementedError(translate("Not enough pins available"));
return;
#endif
Sercom* sercom = NULL;
uint8_t sercom_index;
uint32_t sda_pinmux = 0;
uint32_t scl_pinmux = 0;
for (int i = 0; i < NUM_SERCOMS_PER_PIN; i++) {
sercom_index = sda->sercom[i].index;
if (sercom_index >= SERCOM_INST_NUM) {
continue;
}
Sercom* potential_sercom = sercom_insts[sercom_index];
if (potential_sercom->I2CM.CTRLA.bit.ENABLE != 0 ||
sda->sercom[i].pad != 0) {
continue;
}
sda_pinmux = PINMUX(sda->number, (i == 0) ? MUX_C : MUX_D);
for (int j = 0; j < NUM_SERCOMS_PER_PIN; j++) {
if (sercom_index == scl->sercom[j].index &&
scl->sercom[j].pad == 1) {
scl_pinmux = PINMUX(scl->number, (j == 0) ? MUX_C : MUX_D);
sercom = potential_sercom;
break;
}
}
if (sercom != NULL) {
break;
}
}
uint32_t sda_pinmux, scl_pinmux;
Sercom* sercom = samd_i2c_get_sercom(scl, sda, &sercom_index, &sda_pinmux, &scl_pinmux);
if (sercom == NULL) {
mp_raise_ValueError(translate("Invalid pins"));
}

3
ports/atmel-samd/common-hal/busio/I2C.h
View File

@ -41,4 +41,7 @@ typedef struct {
uint8_t sda_pin;
} busio_i2c_obj_t;
extern Sercom *samd_i2c_get_sercom(const mcu_pin_obj_t* scl, const mcu_pin_obj_t* sda,
uint8_t *sercom_index, uint32_t *sda_pinmux, uint32_t *scl_pinmux);
#endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_BUSIO_I2C_H