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stm32/i2c: On F4 MCUs report the actual I2C SCL frequency.

This commit is contained in:
Damien George 2018-03-07 14:59:03 +11:00
parent 8359210e71
commit 024edafea0
3 changed files with 15 additions and 7 deletions
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18
ports/stm32/i2c.c
View File

@ -191,9 +191,9 @@ STATIC void i2c_set_baudrate(I2C_InitTypeDef *init, uint32_t baudrate) {
"Unsupported I2C baudrate: %lu", baudrate));
}
uint32_t i2c_get_baudrate(I2C_InitTypeDef *init) {
uint32_t i2c_get_baudrate(I2C_HandleTypeDef *i2c) {
for (int i = 0; i < NUM_BAUDRATE_TIMINGS; i++) {
if (pyb_i2c_baudrate_timing[i].timing == init->Timing) {
if (pyb_i2c_baudrate_timing[i].timing == i2c->Init.Timing) {
return pyb_i2c_baudrate_timing[i].baudrate;
}
}
@ -210,8 +210,16 @@ STATIC void i2c_set_baudrate(I2C_InitTypeDef *init, uint32_t baudrate) {
init->DutyCycle = I2C_DUTYCYCLE_16_9;
}
uint32_t i2c_get_baudrate(I2C_InitTypeDef *init) {
return init->ClockSpeed;
uint32_t i2c_get_baudrate(I2C_HandleTypeDef *i2c) {
uint32_t pfreq = i2c->Instance->CR2 & 0x3f;
uint32_t ccr = i2c->Instance->CCR & 0xfff;
if (i2c->Instance->CCR & 0x8000) {
// Fast mode, assume duty cycle of 16/9
return pfreq * 40000 / ccr;
} else {
// Standard mode
return pfreq * 500000 / ccr;
}
}
#endif
@ -545,7 +553,7 @@ STATIC void pyb_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_ki
mp_printf(print, "I2C(%u)", i2c_num);
} else {
if (in_master_mode(self)) {
mp_printf(print, "I2C(%u, I2C.MASTER, baudrate=%u)", i2c_num, i2c_get_baudrate(&self->i2c->Init));
mp_printf(print, "I2C(%u, I2C.MASTER, baudrate=%u)", i2c_num, i2c_get_baudrate(self->i2c));
} else {
mp_printf(print, "I2C(%u, I2C.SLAVE, addr=0x%02x)", i2c_num, (self->i2c->Instance->OAR1 >> 1) & 0x7f);
}

2
ports/stm32/i2c.h
View File

@ -48,7 +48,7 @@ extern const pyb_i2c_obj_t pyb_i2c_obj[4];
void i2c_init0(void);
void i2c_init(I2C_HandleTypeDef *i2c);
void i2c_init_freq(const pyb_i2c_obj_t *self, mp_int_t freq);
uint32_t i2c_get_baudrate(I2C_InitTypeDef *init);
uint32_t i2c_get_baudrate(I2C_HandleTypeDef *i2c);
void i2c_ev_irq_handler(mp_uint_t i2c_id);
void i2c_er_irq_handler(mp_uint_t i2c_id);

2
ports/stm32/machine_i2c.c
View File

@ -88,7 +88,7 @@ STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp
machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "I2C(%u, freq=%u, timeout=%u)",
self - &machine_hard_i2c_obj[0] + 1,
i2c_get_baudrate(&self->pyb->i2c->Init),
i2c_get_baudrate(self->pyb->i2c),
*self->timeout);
}