1 /* Copyright 2018 Jack Humbert
2 * Copyright 2018 Yiancar
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /* This library is only valid for STM32 processors.
19 * This library follows the convention of the AVR i2c_master library.
20 * As a result addresses are expected to be already shifted (addr << 1).
21 * I2CD1 is the default driver which corresponds to pins B6 and B7. This
23 * Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that
24 * STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file. Pins B6 and B7 are used
25 * but using any other I2C pins should be trivial.
28 #include "i2c_master.h"
33 static uint8_t i2c_address
;
35 static const I2CConfig i2cconfig
= {
41 // This configures the I2C clock to 400khz assuming a 72Mhz clock
42 // For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
43 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
47 static i2c_status_t
chibios_to_qmk(const msg_t
* status
) {
50 return I2C_STATUS_SUCCESS
;
52 return I2C_STATUS_TIMEOUT
;
53 // I2C_BUS_ERROR, I2C_ARBITRATION_LOST, I2C_ACK_FAILURE, I2C_OVERRUN, I2C_PEC_ERROR, I2C_SMB_ALERT
55 return I2C_STATUS_ERROR
;
59 __attribute__((weak
)) void i2c_init(void) {
60 // Try releasing special pins for a short time
61 palSetPadMode(I2C1_SCL_BANK
, I2C1_SCL
, PAL_MODE_INPUT
);
62 palSetPadMode(I2C1_SDA_BANK
, I2C1_SDA
, PAL_MODE_INPUT
);
64 chThdSleepMilliseconds(10);
66 palSetPadMode(I2C1_SCL_BANK
, I2C1_SCL
, PAL_MODE_STM32_ALTERNATE_OPENDRAIN
);
67 palSetPadMode(I2C1_SDA_BANK
, I2C1_SDA
, PAL_MODE_STM32_ALTERNATE_OPENDRAIN
);
69 palSetPadMode(I2C1_SCL_BANK
, I2C1_SCL
, PAL_MODE_ALTERNATE(I2C1_SCL_PAL_MODE
) | PAL_STM32_OTYPE_OPENDRAIN
);
70 palSetPadMode(I2C1_SDA_BANK
, I2C1_SDA
, PAL_MODE_ALTERNATE(I2C1_SDA_PAL_MODE
) | PAL_STM32_OTYPE_OPENDRAIN
);
74 i2c_status_t
i2c_start(uint8_t address
) {
75 i2c_address
= address
;
76 i2cStart(&I2C_DRIVER
, &i2cconfig
);
77 return I2C_STATUS_SUCCESS
;
80 i2c_status_t
i2c_transmit(uint8_t address
, const uint8_t* data
, uint16_t length
, uint16_t timeout
) {
81 i2c_address
= address
;
82 i2cStart(&I2C_DRIVER
, &i2cconfig
);
83 msg_t status
= i2cMasterTransmitTimeout(&I2C_DRIVER
, (i2c_address
>> 1), data
, length
, 0, 0, MS2ST(timeout
));
84 return chibios_to_qmk(&status
);
87 i2c_status_t
i2c_receive(uint8_t address
, uint8_t* data
, uint16_t length
, uint16_t timeout
) {
88 i2c_address
= address
;
89 i2cStart(&I2C_DRIVER
, &i2cconfig
);
90 msg_t status
= i2cMasterReceiveTimeout(&I2C_DRIVER
, (i2c_address
>> 1), data
, length
, MS2ST(timeout
));
91 return chibios_to_qmk(&status
);
94 i2c_status_t
i2c_writeReg(uint8_t devaddr
, uint8_t regaddr
, const uint8_t* data
, uint16_t length
, uint16_t timeout
) {
95 i2c_address
= devaddr
;
96 i2cStart(&I2C_DRIVER
, &i2cconfig
);
98 uint8_t complete_packet
[length
+ 1];
99 for (uint8_t i
= 0; i
< length
; i
++) {
100 complete_packet
[i
+ 1] = data
[i
];
102 complete_packet
[0] = regaddr
;
104 msg_t status
= i2cMasterTransmitTimeout(&I2C_DRIVER
, (i2c_address
>> 1), complete_packet
, length
+ 1, 0, 0, MS2ST(timeout
));
105 return chibios_to_qmk(&status
);
108 i2c_status_t
i2c_readReg(uint8_t devaddr
, uint8_t regaddr
, uint8_t* data
, uint16_t length
, uint16_t timeout
) {
109 i2c_address
= devaddr
;
110 i2cStart(&I2C_DRIVER
, &i2cconfig
);
111 msg_t status
= i2cMasterTransmitTimeout(&I2C_DRIVER
, (i2c_address
>> 1), ®addr
, 1, data
, length
, MS2ST(timeout
));
112 return chibios_to_qmk(&status
);
115 void i2c_stop(void) { i2cStop(&I2C_DRIVER
); }