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implements i2c_free for STM #12350

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Merged
merged 2 commits into from
Feb 3, 2020
Merged

implements i2c_free for STM #12350

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95996fb
disable PA_8 i2c pin on NUCLEO_F411RE
maciejbocianski Jan 31, 2020
0b634e5
implement i2c_free for STM family
maciejbocianski Jan 31, 2020
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2 changes: 1 addition & 1 deletion ...ets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F411xE/TARGET_NUCLEO_F411RE/PeripheralPinMaps.h
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Original file line number Diff line number Diff line change
Expand Up @@ -94,7 +94,7 @@ MSTD_CONSTEXPR_OBJ_11 const PinMap PinMap_I2C_SDA[] = {
};

MSTD_CONSTEXPR_OBJ_11 const PinMap PinMap_I2C_SCL[] = {
{PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
//{PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, // Connected to MCO
{PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
{PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
{PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
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47 changes: 47 additions & 0 deletions targets/TARGET_STM/i2c_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -369,6 +369,48 @@ void i2c_init_internal(i2c_t *obj, const i2c_pinmap_t *pinmap)
#endif
}

void i2c_deinit_internal(i2c_t *obj)
{
struct i2c_s *obj_s = I2C_S(obj);

i2c_hw_reset(obj);

HAL_I2C_DeInit(&(obj_s->handle));

#if defined I2C1_BASE
if (obj_s->i2c == I2C_1) {
__HAL_RCC_I2C1_CLK_DISABLE();
}
#endif
#if defined I2C2_BASE
if (obj_s->i2c == I2C_2) {
__HAL_RCC_I2C2_CLK_DISABLE();
}
#endif
#if defined I2C3_BASE
if (obj_s->i2c == I2C_3) {
__HAL_RCC_I2C3_CLK_DISABLE();
}
#endif
#if defined I2C4_BASE
if (obj_s->i2c == I2C_4) {
__HAL_RCC_I2C4_CLK_DISABLE();
}
#endif
#if defined FMPI2C1_BASE
if (obj_s->i2c == FMPI2C_1) {
__HAL_RCC_FMPI2C1_CLK_DISABLE();
}
#endif

pin_mode(obj_s->sda, PullNone);
pin_mode(obj_s->scl, PullNone);

obj_s->sda = NC;
obj_s->scl = NC;
obj_s->i2c = (I2CName)NC;
}

#if STATIC_PINMAP_READY
#define I2C_INIT_DIRECT i2c_init_direct
void i2c_init_direct(i2c_t *obj, const i2c_pinmap_t *pinmap)
Expand Down Expand Up @@ -396,6 +438,11 @@ void i2c_init(i2c_t *obj, PinName sda, PinName scl)
I2C_INIT_DIRECT(obj, &explicit_i2c_pinmap);
}

void i2c_free(i2c_t *obj)
{
i2c_deinit_internal(obj);
}


void i2c_frequency(i2c_t *obj, int hz)
{
Expand Down