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Add ARM I2Cv1 support to i2c_master (#6262)

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* Add ARM I2Cv1 support to i2c_master

* Add I2Cv1 docs
This commit is contained in:
Joel Challis 2019-07-16 09:30:53 +01:00 committed by skullydazed
parent f859375284
commit 4e375aa1f5
3 changed files with 70 additions and 25 deletions
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20
docs/i2c_driver.md
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@ -73,7 +73,22 @@ STM32 MCUs allows a variety of pins to be configured as I2C pins depending on th
| `I2C1_SDA` | The pin number for the SDA pin (0-9) | `7` |
| `I2C1_BANK` (deprecated) | The bank of pins (`GPIOA`, `GPIOB`, `GPIOC`), superceded by `I2C1_SCL_BANK`, `I2C1_SDA_BANK` | `GPIOB` |
STM32 MCUs allow for different timing parameters when configuring I2C. These can be modified using the following parameters, using https://www.st.com/en/embedded-software/stsw-stm32126.html as a reference:
The ChibiOS I2C driver configuration depends on STM32 MCU:
STM32F1xx, STM32F2xx, STM32F4xx, STM32L0xx and STM32L1xx use I2Cv1;
STM32F0xx, STM32F3xx, STM32F7xx and STM32L4xx use I2Cv2;
#### I2Cv1
STM32 MCUs allow for different clock and duty parameters when configuring I2Cv1. These can be modified using the following parameters, using <https://www.playembedded.org/blog/stm32-i2c-chibios/#I2Cv1_configuration_structure> as a reference:
| Variable | Default |
|--------------------|------------------|
| `I2C1_OPMODE` | `OPMODE_I2C` |
| `I2C1_CLOCK_SPEED` | `100000` |
| `I2C1_DUTY_CYCLE` | `STD_DUTY_CYCLE` |
#### I2Cv2
STM32 MCUs allow for different timing parameters when configuring I2Cv2. These can be modified using the following parameters, using <https://www.st.com/en/embedded-software/stsw-stm32126.html> as a reference:
| Variable | Default |
|-----------------------|---------|
@ -83,13 +98,14 @@ STM32 MCUs allow for different timing parameters when configuring I2C. These can
| `I2C1_TIMINGR_SCLH` | `15U` |
| `I2C1_TIMINGR_SCLL` | `21U` |
STM32 MCUs allow for different "alternate function" modes when configuring GPIO pins. These are required to switch the pins used to I2C mode. See the respective datasheet for the appropriate values for your MCU.
STM32 MCUs allow for different "alternate function" modes when configuring GPIO pins. These are required to switch the pins used to I2Cv2 mode. See the respective datasheet for the appropriate values for your MCU.
| Variable | Default |
|---------------------|---------|
| `I2C1_SCL_PAL_MODE` | `4` |
| `I2C1_SDA_PAL_MODE` | `4` |
#### Other
You can also overload the `void i2c_init(void)` function, which has a weak attribute. If you do this the configuration variables above will not be used. Please consult the datasheet of your MCU for the available GPIO configurations. The following is an example initialization function:
```C

11
drivers/arm/i2c_master.c
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@ -33,11 +33,17 @@
static uint8_t i2c_address;
static const I2CConfig i2cconfig = {
#ifdef USE_I2CV1
I2C1_OPMODE,
I2C1_CLOCK_SPEED,
I2C1_DUTY_CYCLE,
#else
STM32_TIMINGR_PRESC(I2C1_TIMINGR_PRESC) |
STM32_TIMINGR_SCLDEL(I2C1_TIMINGR_SCLDEL) | STM32_TIMINGR_SDADEL(I2C1_TIMINGR_SDADEL) |
STM32_TIMINGR_SCLH(I2C1_TIMINGR_SCLH) | STM32_TIMINGR_SCLL(I2C1_TIMINGR_SCLL),
0,
0
#endif
};
static i2c_status_t chibios_to_qmk(const msg_t* status) {
@ -61,8 +67,13 @@ void i2c_init(void)
chThdSleepMilliseconds(10);
#ifdef USE_I2CV1
palSetPadMode(I2C1_SCL_BANK, I2C1_SCL, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
palSetPadMode(I2C1_SDA_BANK, I2C1_SDA, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
#else
palSetPadMode(I2C1_SCL_BANK, I2C1_SCL, PAL_MODE_ALTERNATE(I2C1_SCL_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
palSetPadMode(I2C1_SDA_BANK, I2C1_SDA, PAL_MODE_ALTERNATE(I2C1_SDA_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
#endif
//i2cInit(); //This is invoked by halInit() so no need to redo it.
}

50
drivers/arm/i2c_master.h
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@ -22,10 +22,16 @@
* Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that
* STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file.
*/
#pragma once
#include "ch.h"
#include <hal.h>
#if defined(STM32F1XX) || defined(STM32F1xx) || defined(STM32F2xx) || defined(STM32F4xx) || defined(STM32L0xx) || defined(STM32L1xx)
#define USE_I2CV1
#endif
#ifdef I2C1_BANK
#define I2C1_SCL_BANK I2C1_BANK
#define I2C1_SDA_BANK I2C1_BANK
@ -46,30 +52,42 @@
#define I2C1_SDA 7
#endif
// The default PAL alternate modes are used to signal that the pins are used for I2C
#ifndef I2C1_SCL_PAL_MODE
#ifdef USE_I2CV1
#ifndef I2C1_OPMODE
#define I2C1_OPMODE OPMODE_I2C
#endif
#ifndef I2C1_CLOCK_SPEED
#define I2C1_CLOCK_SPEED 100000 /* 400000 */
#endif
#ifndef I2C1_DUTY_CYCLE
#define I2C1_DUTY_CYCLE STD_DUTY_CYCLE /* FAST_DUTY_CYCLE_2 */
#endif
#else
// The default PAL alternate modes are used to signal that the pins are used for I2C
#ifndef I2C1_SCL_PAL_MODE
#define I2C1_SCL_PAL_MODE 4
#endif
#ifndef I2C1_SDA_PAL_MODE
#endif
#ifndef I2C1_SDA_PAL_MODE
#define I2C1_SDA_PAL_MODE 4
#endif
#endif
// The default timing values below configures the I2C clock to 400khz assuming a 72Mhz clock
// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
#ifndef I2C1_TIMINGR_PRESC
// The default timing values below configures the I2C clock to 400khz assuming a 72Mhz clock
// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
#ifndef I2C1_TIMINGR_PRESC
#define I2C1_TIMINGR_PRESC 15U
#endif
#ifndef I2C1_TIMINGR_SCLDEL
#endif
#ifndef I2C1_TIMINGR_SCLDEL
#define I2C1_TIMINGR_SCLDEL 4U
#endif
#ifndef I2C1_TIMINGR_SDADEL
#endif
#ifndef I2C1_TIMINGR_SDADEL
#define I2C1_TIMINGR_SDADEL 2U
#endif
#ifndef I2C1_TIMINGR_SCLH
#endif
#ifndef I2C1_TIMINGR_SCLH
#define I2C1_TIMINGR_SCLH 15U
#endif
#ifndef I2C1_TIMINGR_SCLL
#endif
#ifndef I2C1_TIMINGR_SCLL
#define I2C1_TIMINGR_SCLL 21U
#endif
#endif
#ifndef I2C_DRIVER