src/main/drivers/stm32/bus_i2c_hal_init.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdbool.h>
  22 #include <stdint.h>
  23 #include <string.h>
  24
  25 #include "platform.h"
  26
  27 #if defined(USE_I2C) && !defined(SOFT_I2C)
  28
  29 #include "drivers/io.h"
  30 #include "drivers/io_impl.h"
  31 #include "drivers/nvic.h"
  32 #include "drivers/time.h"
  33 #include "drivers/rcc.h"
  34
  35 #include "drivers/bus_i2c.h"
  36 #include "drivers/bus_i2c_impl.h"
  37 #include "drivers/bus_i2c_timing.h"
  38
  39 // Number of bits in I2C protocol phase
  40 #define LEN_ADDR 7
  41 #define LEN_RW 1
  42 #define LEN_ACK 1
  43
  44 // Clock period in us during unstick transfer
  45 #define UNSTICK_CLK_US 10
  46
  47 // Allow 500us for clock strech to complete during unstick
  48 #define UNSTICK_CLK_STRETCH (500/UNSTICK_CLK_US)
  49
  50 static void i2cUnstick(IO_t scl, IO_t sda);
  51
  52 #define IOCFG_I2C_PU IO_CONFIG(GPIO_MODE_AF_OD, GPIO_SPEED_FREQ_VERY_HIGH, GPIO_PULLUP)
  53 #define IOCFG_I2C    IO_CONFIG(GPIO_MODE_AF_OD, GPIO_SPEED_FREQ_VERY_HIGH, GPIO_NOPULL)
  54
  55 #define GPIO_AF4_I2C GPIO_AF4_I2C1
  56
  57 const i2cHardware_t i2cHardware[I2CDEV_COUNT] = {
  58 #if defined(STM32F7)
  59 #ifdef USE_I2C_DEVICE_1
  60     {
  61         .device = I2CDEV_1,
  62         .reg = I2C1,
  63         .sclPins = { I2CPINDEF(PB6), I2CPINDEF(PB8) },
  64         .sdaPins = { I2CPINDEF(PB7), I2CPINDEF(PB9) },
  65         .rcc = RCC_APB1(I2C1),
  66         .ev_irq = I2C1_EV_IRQn,
  67         .er_irq = I2C1_ER_IRQn,
  68     },
  69 #endif
  70 #ifdef USE_I2C_DEVICE_2
  71     {
  72         .device = I2CDEV_2,
  73         .reg = I2C2,
  74         .sclPins = { I2CPINDEF(PB10), I2CPINDEF(PF1) },
  75         .sdaPins = { I2CPINDEF(PB11), I2CPINDEF(PF0) },
  76         .rcc = RCC_APB1(I2C2),
  77         .ev_irq = I2C2_EV_IRQn,
  78         .er_irq = I2C2_ER_IRQn,
  79     },
  80 #endif
  81 #ifdef USE_I2C_DEVICE_3
  82     {
  83         .device = I2CDEV_3,
  84         .reg = I2C3,
  85         .sclPins = { I2CPINDEF(PA8) },
  86         .sdaPins = { I2CPINDEF(PC9) },
  87         .rcc = RCC_APB1(I2C3),
  88         .ev_irq = I2C3_EV_IRQn,
  89         .er_irq = I2C3_ER_IRQn,
  90     },
  91 #endif
  92 #ifdef USE_I2C_DEVICE_4
  93     {
  94         .device = I2CDEV_4,
  95         .reg = I2C4,
  96         .sclPins = { I2CPINDEF(PD12), I2CPINDEF(PF14) },
  97         .sdaPins = { I2CPINDEF(PD13), I2CPINDEF(PF15) },
  98         .rcc = RCC_APB1(I2C4),
  99         .ev_irq = I2C4_EV_IRQn,
 100         .er_irq = I2C4_ER_IRQn,
 101     },
 102 #endif
 103 #elif defined(STM32H7)
 104 #ifdef USE_I2C_DEVICE_1
 105     {
 106         .device = I2CDEV_1,
 107         .reg = I2C1,
 108         .sclPins = { I2CPINDEF(PB6, GPIO_AF4_I2C1), I2CPINDEF(PB8, GPIO_AF4_I2C1) },
 109         .sdaPins = { I2CPINDEF(PB7, GPIO_AF4_I2C1), I2CPINDEF(PB9, GPIO_AF4_I2C1) },
 110         .rcc = RCC_APB1L(I2C1),
 111         .ev_irq = I2C1_EV_IRQn,
 112         .er_irq = I2C1_ER_IRQn,
 113     },
 114 #endif
 115 #ifdef USE_I2C_DEVICE_2
 116     {
 117         .device = I2CDEV_2,
 118         .reg = I2C2,
 119         .sclPins = { I2CPINDEF(PB10, GPIO_AF4_I2C2), I2CPINDEF(PF1, GPIO_AF4_I2C2) },
 120         .sdaPins = { I2CPINDEF(PB11, GPIO_AF4_I2C2), I2CPINDEF(PF0, GPIO_AF4_I2C2) },
 121         .rcc = RCC_APB1L(I2C2),
 122         .ev_irq = I2C2_EV_IRQn,
 123         .er_irq = I2C2_ER_IRQn,
 124     },
 125 #endif
 126 #ifdef USE_I2C_DEVICE_3
 127     {
 128         .device = I2CDEV_3,
 129         .reg = I2C3,
 130         .sclPins = { I2CPINDEF(PA8, GPIO_AF4_I2C3) },
 131         .sdaPins = { I2CPINDEF(PC9, GPIO_AF4_I2C3) },
 132         .rcc = RCC_APB1L(I2C3),
 133         .ev_irq = I2C3_EV_IRQn,
 134         .er_irq = I2C3_ER_IRQn,
 135     },
 136 #endif
 137 #ifdef USE_I2C_DEVICE_4
 138     {
 139         .device = I2CDEV_4,
 140         .reg = I2C4,
 141         .sclPins = { I2CPINDEF(PD12, GPIO_AF4_I2C4), I2CPINDEF(PF14, GPIO_AF4_I2C4), I2CPINDEF(PB6, GPIO_AF6_I2C4), I2CPINDEF(PB8, GPIO_AF6_I2C4) },
 142         .sdaPins = { I2CPINDEF(PD13, GPIO_AF4_I2C4), I2CPINDEF(PF15, GPIO_AF4_I2C4), I2CPINDEF(PB7, GPIO_AF6_I2C4), I2CPINDEF(PB9, GPIO_AF6_I2C4) },
 143         .rcc = RCC_APB4(I2C4),
 144         .ev_irq = I2C4_EV_IRQn,
 145         .er_irq = I2C4_ER_IRQn,
 146     },
 147 #endif
 148 #elif defined(STM32G4)
 149 #ifdef USE_I2C_DEVICE_1
 150     {
 151         .device = I2CDEV_1,
 152         .reg = I2C1,
 153
 154         // Some boards are overloading SWD pins with I2C1 for maximum pin utilization on 48-pin CE(U) packages.
 155         // Be carefull when using SWD on these boards if I2C1 pins are defined by default.
 156
 157         .sclPins = { I2CPINDEF(PA13, GPIO_AF4_I2C1), I2CPINDEF(PA15, GPIO_AF4_I2C1), I2CPINDEF(PB6,  GPIO_AF4_I2C1), I2CPINDEF(PB8,  GPIO_AF4_I2C1), },
 158         .sdaPins = { I2CPINDEF(PA14, GPIO_AF4_I2C1), I2CPINDEF(PB7,  GPIO_AF4_I2C1), I2CPINDEF(PB9,  GPIO_AF4_I2C1), },
 159         .rcc = RCC_APB11(I2C1),
 160         .ev_irq = I2C1_EV_IRQn,
 161         .er_irq = I2C1_ER_IRQn,
 162     },
 163 #endif
 164 #ifdef USE_I2C_DEVICE_2
 165     {
 166         .device = I2CDEV_2,
 167         .reg = I2C2,
 168         .sclPins = { I2CPINDEF(PA9,  GPIO_AF4_I2C2) },
 169         .sdaPins = { I2CPINDEF(PA8, GPIO_AF4_I2C2), I2CPINDEF(PF6, GPIO_AF4_I2C2) },
 170         .rcc = RCC_APB11(I2C2),
 171         .ev_irq = I2C2_EV_IRQn,
 172         .er_irq = I2C2_ER_IRQn,
 173     },
 174 #endif
 175 #ifdef USE_I2C_DEVICE_3
 176     {
 177         .device = I2CDEV_3,
 178         .reg = I2C3,
 179         .sclPins = { I2CPINDEF(PA10, GPIO_AF2_I2C3), I2CPINDEF(PC8,  GPIO_AF8_I2C3), },
 180         .sdaPins = { I2CPINDEF(PB5,  GPIO_AF8_I2C3), I2CPINDEF(PC9,  GPIO_AF8_I2C3), I2CPINDEF(PC11, GPIO_AF8_I2C3), },
 181         .rcc = RCC_APB11(I2C3),
 182         .ev_irq = I2C3_EV_IRQn,
 183         .er_irq = I2C3_ER_IRQn,
 184     },
 185 #endif
 186 #ifdef USE_I2C_DEVICE_4
 187     {
 188         .device = I2CDEV_4,
 189         .reg = I2C4,
 190
 191         // Here, SWDIO(PA13) is overloaded with I2C4_SCL, too.
 192         // See comment in the I2C1 section above.
 193
 194         .sclPins = { I2CPINDEF(PA13, GPIO_AF3_I2C4), I2CPINDEF(PB6,  GPIO_AF3_I2C4), I2CPINDEF(PC6,  GPIO_AF8_I2C4), },
 195         .sdaPins = { I2CPINDEF(PB7,  GPIO_AF4_I2C4), I2CPINDEF(PC7,  GPIO_AF8_I2C4), },
 196         .rcc = RCC_APB12(I2C4),
 197         .ev_irq = I2C4_EV_IRQn,
 198         .er_irq = I2C4_ER_IRQn,
 199     },
 200 #endif
 201 #endif
 202 };
 203
 204 i2cDevice_t i2cDevice[I2CDEV_COUNT];
 205
 206 void i2cInit(I2CDevice device)
 207 {
 208     if (device == I2CINVALID) {
 209         return;
 210     }
 211
 212     i2cDevice_t *pDev = &i2cDevice[device];
 213
 214     const i2cHardware_t *hardware = pDev->hardware;
 215     const IO_t scl = pDev->scl;
 216     const IO_t sda = pDev->sda;
 217
 218     if (!hardware || IOGetOwner(scl) || IOGetOwner(sda)) {
 219         return;
 220     }
 221
 222     IOInit(scl, OWNER_I2C_SCL, RESOURCE_INDEX(device));
 223     IOInit(sda, OWNER_I2C_SDA, RESOURCE_INDEX(device));
 224
 225     // Enable RCC
 226     RCC_ClockCmd(hardware->rcc, ENABLE);
 227
 228     i2cUnstick(scl, sda);
 229
 230     // Init pins
 231 #if defined(STM32F7)
 232     IOConfigGPIOAF(scl, pDev->pullUp ? IOCFG_I2C_PU : IOCFG_I2C, GPIO_AF4_I2C);
 233     IOConfigGPIOAF(sda, pDev->pullUp ? IOCFG_I2C_PU : IOCFG_I2C, GPIO_AF4_I2C);
 234 #elif defined(STM32H7) || defined(STM32G4)
 235     IOConfigGPIOAF(scl, pDev->pullUp ? IOCFG_I2C_PU : IOCFG_I2C, pDev->sclAF);
 236     IOConfigGPIOAF(sda, pDev->pullUp ? IOCFG_I2C_PU : IOCFG_I2C, pDev->sdaAF);
 237 #else
 238     IOConfigGPIO(scl, IOCFG_AF_OD);
 239     IOConfigGPIO(sda, IOCFG_AF_OD);
 240 #endif
 241
 242     // Init I2C peripheral
 243
 244     I2C_HandleTypeDef *pHandle = &pDev->handle;
 245
 246     memset(pHandle, 0, sizeof(*pHandle));
 247
 248     pHandle->Instance = pDev->hardware->reg;
 249
 250     // Compute TIMINGR value based on peripheral clock for this device instance
 251
 252     uint32_t i2cPclk;
 253
 254 #if defined(STM32F7) || defined(STM32G4)
 255     // F7 Clock source configured in startup/system_stm32f7xx.c as:
 256     //   I2C1234 : PCLK1
 257     // G4 Clock source configured in startup/system_stm32g4xx.c as:
 258     //   I2C1234 : PCLK1
 259     i2cPclk = HAL_RCC_GetPCLK1Freq();
 260 #elif defined(STM32H7)
 261     // Clock sources configured in startup/system_stm32h7xx.c as:
 262     //   I2C123 : D2PCLK1 (rcc_pclk1 for APB1)
 263     //   I2C4   : D3PCLK1 (rcc_pclk4 for APB4)
 264     i2cPclk = (pHandle->Instance == I2C4) ? HAL_RCCEx_GetD3PCLK1Freq() : HAL_RCC_GetPCLK1Freq();
 265 #else
 266 #error Unknown MCU type
 267 #endif
 268
 269     pHandle->Init.Timing = i2cClockTIMINGR(i2cPclk, pDev->clockSpeed, 0);
 270
 271     pHandle->Init.OwnAddress1 = 0x0;
 272     pHandle->Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
 273     pHandle->Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
 274     pHandle->Init.OwnAddress2 = 0x0;
 275     pHandle->Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
 276     pHandle->Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
 277
 278     HAL_I2C_Init(pHandle);
 279
 280     // Enable the Analog I2C Filter
 281     HAL_I2CEx_ConfigAnalogFilter(pHandle, I2C_ANALOGFILTER_ENABLE);
 282
 283     // Setup interrupt handlers
 284     HAL_NVIC_SetPriority(hardware->er_irq, NVIC_PRIORITY_BASE(NVIC_PRIO_I2C_ER), NVIC_PRIORITY_SUB(NVIC_PRIO_I2C_ER));
 285     HAL_NVIC_EnableIRQ(hardware->er_irq);
 286     HAL_NVIC_SetPriority(hardware->ev_irq, NVIC_PRIORITY_BASE(NVIC_PRIO_I2C_EV), NVIC_PRIORITY_SUB(NVIC_PRIO_I2C_EV));
 287     HAL_NVIC_EnableIRQ(hardware->ev_irq);
 288 }
 289
 290 static void i2cUnstick(IO_t scl, IO_t sda)
 291 {
 292     int i;
 293
 294     IOHi(scl);
 295     IOHi(sda);
 296
 297     IOConfigGPIO(scl, IOCFG_OUT_OD);
 298     IOConfigGPIO(sda, IOCFG_OUT_OD);
 299
 300     // Clock out, with SDA high:
 301     //   7 data bits
 302     //   1 READ bit
 303     //   1 cycle for the ACK
 304     for (i = 0; i < (LEN_ADDR + LEN_RW + LEN_ACK); i++) {
 305         // Wait for any clock stretching to finish
 306         int timeout = UNSTICK_CLK_STRETCH;
 307         while (!IORead(scl) && timeout) {
 308             delayMicroseconds(UNSTICK_CLK_US);
 309             timeout--;
 310         }
 311
 312         // Pull low
 313         IOLo(scl); // Set bus low
 314         delayMicroseconds(UNSTICK_CLK_US/2);
 315         IOHi(scl); // Set bus high
 316         delayMicroseconds(UNSTICK_CLK_US/2);
 317     }
 318
 319     // Generate a stop condition in case there was none
 320     IOLo(scl);
 321     delayMicroseconds(UNSTICK_CLK_US/2);
 322     IOLo(sda);
 323     delayMicroseconds(UNSTICK_CLK_US/2);
 324
 325     IOHi(scl); // Set bus scl high
 326     delayMicroseconds(UNSTICK_CLK_US/2);
 327     IOHi(sda); // Set bus sda high
 328 }
 329
 330 #endif