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cpu/qn908x/periph_i2c: enable internal pull-up on SCL

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Always enable the internal pull-up on the SCL line to always have a
functional I2C bus. This may increase power consumption where an
external pull up is present as well. But let's wait for a real world
use case where this would help to extend battery life before making
this configurable.

This fixes https://github.com/RIOT-OS/RIOT/issues/19021
This commit is contained in:
Marian Buschsieweke 2023-06-12 21:03:17 +02:00
parent 0e09b43f6d
commit 98b38399df
No known key found for this signature in database
GPG Key ID: CB8E3238CE715A94
3 changed files with 53 additions and 21 deletions
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2
cpu/qn908x/include/flexcomm.h
View File

@ -57,7 +57,7 @@ int flexcomm_init(FLEXCOMM_Type *dev, flexcom_pselid_t mode);
* For example, the flexcomm block number of FLEXCOMM2, the pointer to the
* FLEXCOMM_Type block is 2. If an invalid address is passed returns -1.
*/
int flexcomm_instance_from_addr(FLEXCOMM_Type *dev);
int flexcomm_instance_from_addr(const FLEXCOMM_Type *dev);
#ifdef __cplusplus
}

4
cpu/qn908x/periph/flexcomm.c
View File

@ -27,6 +27,8 @@
#include "vendor/drivers/fsl_clock.h"
#define ENABLE_DEBUG 0
#include "debug.h"
int flexcomm_init(FLEXCOMM_Type *dev, flexcom_pselid_t mode)
@ -59,7 +61,7 @@ int flexcomm_init(FLEXCOMM_Type *dev, flexcom_pselid_t mode)
return flexcomm_num;
}
int flexcomm_instance_from_addr(FLEXCOMM_Type *dev)
int flexcomm_instance_from_addr(const FLEXCOMM_Type *dev)
{
static const FLEXCOMM_Type *flexcomm_addrs[] = FLEXCOMM_BASE_PTRS;

68
cpu/qn908x/periph/i2c.c
View File

@ -32,6 +32,7 @@
#include "periph/i2c.h"
#include "vendor/drivers/fsl_clock.h"
#include "vendor/drivers/fsl_iocon.h"
#include "gpio_mux.h"
#include "flexcomm.h"
@ -41,6 +42,22 @@
static mutex_t locks[I2C_NUMOF];
/**
* @name Definitions for MSTSTATE bits in I2C Status register STAT
* @{
*/
/* Controller Idle State Code */
#define I2C_STAT_MSTSTATE_IDLE (0)
/* Controller Receive Ready State Code */
#define I2C_STAT_MSTSTATE_RXREADY (1)
/* Controller Transmit Ready State Code */
#define I2C_STAT_MSTSTATE_TXREADY (2)
/* Controller NACK by peripheral on address State Code */
#define I2C_STAT_MSTSTATE_NACKADR (3)
/* Controller NACK by peripheral on data State Code */
#define I2C_STAT_MSTSTATE_NACKDAT (4)
/** @} */
/**
* @brief Limit value I2C CLKDIV register.
*/
@ -99,16 +116,41 @@ static void _i2c_init_pins(i2c_t dev)
*/
static const uint32_t func5_mask =
(1 << 2) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 20) | (1 << 21);
/* TODO: Have a way to configure IOCON_MODE_PULLUP and IOCON_DRIVE_HIGH
* from the board. */
gpio_init_mux(conf->pin_sda,
((1u << GPIO_T_PIN(conf->pin_sda)) & func5_mask) ? 5 : 4);
gpio_init_mux(conf->pin_scl,
((1u << GPIO_T_PIN(conf->pin_scl)) & func5_mask) ? 5 : 4);
uint32_t sda_mode = IOCON_FUNC4;
if ((1u << GPIO_T_PIN(conf->pin_sda)) & func5_mask) {
sda_mode = IOCON_FUNC5;
}
uint32_t scl_mode = IOCON_FUNC4;
if ((1u << GPIO_T_PIN(conf->pin_scl)) & func5_mask) {
sda_mode = IOCON_FUNC5;
}
/* Using the internal pull up will make sure the I2C bus is also working
* when no external pull up is present. It can waste power by when both
* external and internal pull up are present. If a real world example
* shows up where disabling the internal pull up is helpful, we can extend
* i2c_conf_t to make it configurable */
scl_mode |= IOCON_MODE_PULLUP;
gpio_init_mux(conf->pin_sda, sda_mode);
gpio_init_mux(conf->pin_scl, scl_mode);
mutex_unlock(&locks[dev]);
}
static void _enable(I2C_Type *const i2c_dev)
{
i2c_dev->CFG = I2C_CFG_MSTEN_MASK;
while ((i2c_dev->STAT & I2C_STAT_MSTPENDING_MASK) == 0) {
/* I2C peripheral not yet available, spin more ... */
}
/* I2C peripheral is online, check state is indeed idle */
assert((i2c_dev->STAT & I2C_STAT_MSTSTATE_MASK) == I2C_STAT_MSTSTATE_IDLE);
}
void i2c_init(i2c_t dev)
{
assert(dev < I2C_NUMOF);
@ -126,7 +168,7 @@ void i2c_init(i2c_t dev)
}
/* Enable controller mode, no timeout, no monitor, no clock stretching. */
i2c_dev->CFG = I2C_CFG_MSTEN_MASK;
_enable(i2c_dev);
_i2c_controller_set_speed(i2c_dev, conf->speed);
locks[dev] = (mutex_t)MUTEX_INIT_LOCKED;
@ -192,18 +234,6 @@ static uint32_t _i2c_stop(I2C_Type *i2c_dev)
return status;
}
/* Definitions for MSTSTATE bits in I2C Status register STAT */
/* Controller Idle State Code */
#define I2C_STAT_MSTSTATE_IDLE (0)
/* Controller Receive Ready State Code */
#define I2C_STAT_MSTSTATE_RXREADY (1)
/* Controller Transmit Ready State Code */
#define I2C_STAT_MSTSTATE_TXREADY (2)
/* Controller NACK by peripheral on address State Code */
#define I2C_STAT_MSTSTATE_NACKADR (3)
/* Controller NACK by peripheral on data State Code */
#define I2C_STAT_MSTSTATE_NACKDAT (4)
static int _i2c_transfer_blocking(i2c_t dev, uint32_t addr_dir, uint8_t *data,
size_t len, uint8_t flags)