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nrf/modules/machine: Support the freq=n argument for machine.I2C.

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Mostly for compatibility.  Effective values are 100000, 250000 and 400000.
The supplied values are mapped to these.
This commit is contained in:
robert-hh 2023-03-10 21:12:18 +01:00 committed by Damien George
parent 3bbf2ef3fb
commit a2b31f968d
1 changed files with 17 additions and 2 deletions
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19
ports/nrf/modules/machine/i2c.c
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@ -48,6 +48,7 @@
#define nrfx_twi_config_t nrfx_twim_config_t
#define nrfx_twi_init nrfx_twim_init
#define nrfx_twi_uninit nrfx_twim_uninit
#define nrfx_twi_enable nrfx_twim_enable
#define nrfx_twi_xfer nrfx_twim_xfer
#define nrfx_twi_disable nrfx_twim_disable
@ -59,6 +60,8 @@
#define NRFX_TWI_INSTANCE NRFX_TWIM_INSTANCE
#define NRF_TWI_FREQ_100K NRF_TWIM_FREQ_100K
#define NRF_TWI_FREQ_250K NRF_TWIM_FREQ_250K
#define NRF_TWI_FREQ_400K NRF_TWIM_FREQ_400K
#endif
@ -96,11 +99,12 @@ STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp
mp_obj_t machine_hard_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
MP_MACHINE_I2C_CHECK_FOR_LEGACY_SOFTI2C_CONSTRUCTION(n_args, n_kw, all_args);
enum { ARG_id, ARG_scl, ARG_sda };
enum { ARG_id, ARG_scl, ARG_sda, ARG_freq };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_scl, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_sda, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
};
// parse args
@ -115,10 +119,21 @@ mp_obj_t machine_hard_i2c_make_new(const mp_obj_type_t *type, size_t n_args, siz
config.scl = mp_hal_get_pin_obj(args[ARG_scl].u_obj)->pin;
config.sda = mp_hal_get_pin_obj(args[ARG_sda].u_obj)->pin;
config.frequency = NRF_TWI_FREQ_400K;
int freq = NRF_TWI_FREQ_400K;
if (args[ARG_freq].u_int != -1) {
if (args[ARG_freq].u_int <= 150000) {
freq = NRF_TWI_FREQ_100K;
} else if (args[ARG_freq].u_int < 320000) {
freq = NRF_TWI_FREQ_250K;
}
}
config.frequency = freq;
config.hold_bus_uninit = false;
// First reset the TWI
nrfx_twi_uninit(&self->p_twi);
// Set context to this object.
nrfx_twi_init(&self->p_twi, &config, NULL, (void *)self);