circuitpython/ports/stm32f4/common-hal/busio/I2C.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft
* Copyright (c) 2019 Lucian Copeland for Adafruit Industries
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*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
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#include "shared-bindings/busio/I2C.h"
#include "py/mperrno.h"
#include "py/runtime.h"
#include "stm32f4xx_hal.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "supervisor/shared/translate.h"
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#include "common-hal/microcontroller/Pin.h"
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STATIC bool reserved_i2c[3];
void i2c_reset(void) {
//Note: I2Cs are also forcibly reset in construct, due to silicon error
#ifdef I2C1
reserved_i2c[0] = false;
__HAL_RCC_I2C1_CLK_DISABLE();
#endif
#ifdef I2C2
reserved_i2c[1] = false;
__HAL_RCC_I2C2_CLK_DISABLE();
#endif
#ifdef I2C3
reserved_i2c[3] = false;
__HAL_RCC_I2C3_CLK_DISABLE();
#endif
}
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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) {
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//match pins to I2C objects
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I2C_TypeDef * I2Cx;
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uint8_t sda_len = sizeof(mcu_i2c_sda_list)/sizeof(*mcu_i2c_sda_list);
uint8_t scl_len = sizeof(mcu_i2c_scl_list)/sizeof(*mcu_i2c_scl_list);
for(uint i=0; i<sda_len;i++) {
if (mcu_i2c_sda_list[i].pin == sda) {
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for(uint j=0; j<scl_len;j++) {
if ((mcu_i2c_scl_list[j].pin == scl)
&& (mcu_i2c_scl_list[j].i2c_index == mcu_i2c_sda_list[i].i2c_index)) {
self->scl = &mcu_i2c_scl_list[j];
self->sda = &mcu_i2c_sda_list[i];
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break;
}
}
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}
}
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//handle typedef selection, errors
if(self->sda!=NULL && self->scl!=NULL ) {
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I2Cx = mcu_i2c_banks[self->sda->i2c_index-1];
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} else {
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mp_raise_RuntimeError(translate("Invalid I2C pin selection"));
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}
if(reserved_i2c[self->sda->i2c_index-1]) {
mp_raise_RuntimeError(translate("Hardware busy, try alternative pins"));
}
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//Start GPIO for each pin
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = pin_mask(sda->number);
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GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = self->sda->altfn_index;
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HAL_GPIO_Init(pin_port(sda->port), &GPIO_InitStruct);
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GPIO_InitStruct.Pin = pin_mask(scl->number);
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = self->scl->altfn_index;
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HAL_GPIO_Init(pin_port(scl->port), &GPIO_InitStruct);
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//Fix for HAL error caused by soft reboot GPIO init SDA pin voltage drop. See Eratta.
//Must be in this exact spot or I2C will get stuck in infinite loop.
//TODO: See git issue #2172
#ifdef I2C1
__HAL_RCC_I2C1_FORCE_RESET();
HAL_Delay(2);
__HAL_RCC_I2C1_RELEASE_RESET();
#endif
#ifdef I2C2
__HAL_RCC_I2C2_FORCE_RESET();
HAL_Delay(2);
__HAL_RCC_I2C2_RELEASE_RESET();
#endif
#ifdef I2C3
__HAL_RCC_I2C3_FORCE_RESET();
HAL_Delay(2);
__HAL_RCC_I2C3_RELEASE_RESET();
#endif
//Keep separate so above hack can be cleanly replaced
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#ifdef I2C1
if(I2Cx==I2C1) {
reserved_i2c[0] = true;
__HAL_RCC_I2C1_CLK_ENABLE();
}
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#endif
#ifdef I2C2
if(I2Cx==I2C2) {
reserved_i2c[1] = true;
__HAL_RCC_I2C2_CLK_ENABLE();
}
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#endif
#ifdef I2C3
if(I2Cx==I2C3) {
reserved_i2c[2] = true;
__HAL_RCC_I2C3_CLK_ENABLE();
}
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#endif
self->handle.Instance = I2Cx;
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self->handle.Init.ClockSpeed = 100000;
self->handle.Init.DutyCycle = I2C_DUTYCYCLE_2;
self->handle.Init.OwnAddress1 = 0;
self->handle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
self->handle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
self->handle.Init.OwnAddress2 = 0;
self->handle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
self->handle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if(HAL_I2C_Init(&(self->handle)) != HAL_OK) {
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mp_raise_RuntimeError(translate("I2C Init Error"));
}
claim_pin(sda);
claim_pin(scl);
}
bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) {
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return self->sda->pin == mp_const_none;
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}
void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) {
if (common_hal_busio_i2c_deinited(self)) {
return;
}
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#ifdef I2C1
if(self->handle.Instance==I2C1) {
reserved_i2c[0] = 0;
__HAL_RCC_I2C1_CLK_DISABLE();
}
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#endif
#ifdef I2C2
if(self->handle.Instance==I2C2) {
reserved_i2c[1] = 0;
__HAL_RCC_I2C2_CLK_DISABLE();
}
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#endif
#ifdef I2C3
if(self->handle.Instance==I2C3) {
reserved_i2c[3] = 0;
__HAL_RCC_I2C3_CLK_DISABLE();
}
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#endif
reset_pin_number(self->sda->pin->port,self->sda->pin->number);
reset_pin_number(self->scl->pin->port,self->scl->pin->number);
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self->sda = mp_const_none;
self->scl = mp_const_none;
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}
bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr) {
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return HAL_I2C_IsDeviceReady(&(self->handle), (uint16_t)(addr<<1),2,2) == HAL_OK;
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}
bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self) {
bool grabbed_lock = false;
//Critical section code that may be required at some point.
// uint32_t store_primask = __get_PRIMASK();
// __disable_irq();
// __DMB();
if (!self->has_lock) {
grabbed_lock = true;
self->has_lock = true;
}
// __DMB();
// __set_PRIMASK(store_primask);
return grabbed_lock;
}
bool common_hal_busio_i2c_has_lock(busio_i2c_obj_t *self) {
return self->has_lock;
}
void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
self->has_lock = false;
}
uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr,
const uint8_t *data, size_t len, bool transmit_stop_bit) {
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HAL_StatusTypeDef result = HAL_I2C_Master_Transmit(&(self->handle), (uint16_t)(addr<<1), (uint8_t *)data, (uint16_t)len, 500);
return result == HAL_OK ? 0 : MP_EIO;
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}
uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t addr,
uint8_t *data, size_t len) {
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return HAL_I2C_Master_Receive(&(self->handle), (uint16_t)(addr<<1), data, (uint16_t)len, 500) == HAL_OK ? 0 : MP_EIO;
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}