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samd/machine_spi: Register SerCom objects as root pointers.

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Protect SerCom (UART, SPI, I2C) objects from getting freed by the GC when
they go out of scope without being deinitialized.  Otherwise the ISR of a
Sercom may access an invalid data structure.
This commit is contained in:
robert-hh
2022-10-13 19:04:37 +02:00
committed by Damien George
parent d74215a313
commit a1eebc507e
3 changed files with 10 additions and 12 deletions
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5
ports/samd/machine_i2c.c
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@@ -69,7 +69,6 @@ typedef struct _machine_i2c_obj_t {
} machine_i2c_obj_t;
extern Sercom *sercom_instance[];
extern void *sercom_table[SERCOM_INST_NUM];
STATIC void i2c_send_command(Sercom *i2c, uint8_t command) {
i2c->I2CM.CTRLB.bit.CMD = command;
@@ -79,7 +78,7 @@ STATIC void i2c_send_command(Sercom *i2c, uint8_t command) {
void common_i2c_irq_handler(int i2c_id) {
// handle Sercom I2C IRQ
machine_i2c_obj_t *self = sercom_table[i2c_id];
machine_i2c_obj_t *self = MP_STATE_PORT(sercom_table[i2c_id]);
// Handle IRQ
if (self != NULL) {
Sercom *i2c = self->instance;
@@ -159,7 +158,7 @@ mp_obj_t machine_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_t n
if (sda_pad_config.pad_nr != 0 || scl_pad_config.pad_nr != 1) {
mp_raise_ValueError(MP_ERROR_TEXT("invalid pin for sda or scl"));
}
sercom_table[self->id] = self;
MP_STATE_PORT(sercom_table[self->id]) = self;
self->freq = args[ARG_freq].u_int;
// Configure the Pin mux.