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TwiMaster is now based on the NRFX TWI driver, as it handles more edge cases and workarounds for errors on the bus.

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Reset the TWI bus after the soft-reset of the motion sensor to workaround issues on the TWI bus.
This commit is contained in:
Jean-François Milants 2021-04-08 20:07:24 +02:00
parent 1d7576de64
commit 9ac4be8b75
7 changed files with 67 additions and 207 deletions
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2
src/CMakeLists.txt
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@ -83,7 +83,7 @@ set(SDK_SOURCE_FILES
"${NRF5_SDK_PATH}/external/fprintf/nrf_fprintf_format.c"
# TWI
"${NRF5_SDK_PATH}/modules/nrfx/drivers/src/nrfx_twi.c"
"${NRF5_SDK_PATH}/modules/nrfx/drivers/src/nrfx_twim.c"
# GPIOTE
"${NRF5_SDK_PATH}/components/libraries/gpiote/app_gpiote.c"

15
src/drivers/Bma421.cpp
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@ -35,12 +35,9 @@ Bma421::Bma421(TwiMaster& twiMaster, uint8_t twiAddress) : twiMaster{twiMaster},
}
void Bma421::Init() {
auto ret = bma4_soft_reset(&bma);
if(ret != BMA4_OK) return;
if(not isResetOk) return; // Call SoftReset (and reset TWI device) first!
nrf_delay_ms(1);
ret = bma423_init(&bma);
auto ret = bma423_init(&bma);
if(ret != BMA4_OK) return;
ret = bma423_write_config_file(&bma);
@ -109,3 +106,11 @@ bool Bma421::IsOk() const {
void Bma421::ResetStepCounter() {
bma423_reset_step_counter(&bma);
}
void Bma421::SoftReset() {
auto ret = bma4_soft_reset(&bma);
if(ret == BMA4_OK) {
isResetOk = true;
nrf_delay_ms(1);
}
}

4
src/drivers/Bma421.h
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@ -18,6 +18,9 @@ namespace Pinetime {
Bma421(Bma421&&) = delete;
Bma421& operator=(Bma421&&) = delete;
/// The chip freezes the TWI bus after the softreset operation. Softreset is separated from the
/// Init() method to allow the caller to uninit and then reinit the TWI device after the softreset.
void SoftReset();
void Init();
Values Process();
void ResetStepCounter();
@ -34,6 +37,7 @@ namespace Pinetime {
uint8_t deviceAddress = 0x18;
struct bma4_dev bma;
bool isOk = false;
bool isResetOk = false;
};
}
}

227
src/drivers/TwiMaster.cpp
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@ -2,195 +2,77 @@
#include <cstring>
#include <hal/nrf_gpio.h>
#include <nrfx_log.h>
#include <nrfx_twim.h>
#include <nrf_drv_twi.h>
using namespace Pinetime::Drivers;
// TODO use shortcut to automatically send STOP when receive LastTX, for example
// TODO use DMA/IRQ
TwiMaster::TwiMaster(const Modules module, const Parameters& params) : module{module}, params{params} {
mutex = xSemaphoreCreateBinary();
TwiMaster::TwiMaster(const Modules module, const Parameters& params) : module{module}, params{params}, mutex{xSemaphoreCreateBinary()} {
ASSERT(mutex != nullptr);
switch(module) {
case Modules::TWIM1:
default:
twim = NRFX_TWIM_INSTANCE(1);
break;
}
}
void TwiMaster::Init() {
NRF_GPIO->PIN_CNF[params.pinScl] = ((uint32_t)GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos)
| ((uint32_t)GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
| ((uint32_t)GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)
| ((uint32_t)GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos)
| ((uint32_t)GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
NRF_GPIO->PIN_CNF[params.pinSda] = ((uint32_t)GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos)
| ((uint32_t)GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
| ((uint32_t)GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)
| ((uint32_t)GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos)
| ((uint32_t)GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
switch(module) {
case Modules::TWIM1: twiBaseAddress = NRF_TWIM1; break;
default:
return;
}
switch(static_cast<Frequencies>(params.frequency)) {
case Frequencies::Khz100 : twiBaseAddress->FREQUENCY = TWIM_FREQUENCY_FREQUENCY_K100; break;
case Frequencies::Khz250 : twiBaseAddress->FREQUENCY = TWIM_FREQUENCY_FREQUENCY_K250; break;
case Frequencies::Khz400 : twiBaseAddress->FREQUENCY = TWIM_FREQUENCY_FREQUENCY_K400; break;
}
twiBaseAddress->PSEL.SCL = params.pinScl;
twiBaseAddress->PSEL.SDA = params.pinSda;
twiBaseAddress->EVENTS_LASTRX = 0;
twiBaseAddress->EVENTS_STOPPED = 0;
twiBaseAddress->EVENTS_LASTTX = 0;
twiBaseAddress->EVENTS_ERROR = 0;
twiBaseAddress->EVENTS_RXSTARTED = 0;
twiBaseAddress->EVENTS_SUSPENDED = 0;
twiBaseAddress->EVENTS_TXSTARTED = 0;
twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Enabled << TWIM_ENABLE_ENABLE_Pos);
/* // IRQ
NVIC_ClearPendingIRQ(_IRQn);
NVIC_SetPriority(_IRQn, 2);
NVIC_EnableIRQ(_IRQn);
*/
nrfx_twim_config_t config;
config.frequency = static_cast<nrf_twim_frequency_t>(params.frequency);
config.hold_bus_uninit = false;
config.interrupt_priority = 0;
config.scl = params.pinScl;
config.sda = params.pinSda;
nrfx_twim_init(&twim,
&config,
nullptr,
nullptr);
nrfx_twim_enable(&twim);
xSemaphoreGive(mutex);
}
TwiMaster::ErrorCodes TwiMaster::Read(uint8_t deviceAddress, uint8_t registerAddress, uint8_t *data, size_t size) {
xSemaphoreTake(mutex, portMAX_DELAY);
auto ret = ReadWithRetry(deviceAddress, registerAddress, data, size);
TwiMaster::ErrorCodes ret;
auto err = nrfx_twim_tx(&twim, deviceAddress, &registerAddress, 1, false);
if(err != 0) {
return TwiMaster::ErrorCodes::TransactionFailed;
}
err = nrfx_twim_rx(&twim, deviceAddress, data, size);
if(err != 0) {
return TwiMaster::ErrorCodes::TransactionFailed;
}
xSemaphoreGive(mutex);
return ret;
return TwiMaster::ErrorCodes::NoError;
}
TwiMaster::ErrorCodes TwiMaster::Write(uint8_t deviceAddress, uint8_t registerAddress, const uint8_t *data, size_t size) {
ASSERT(size <= maxDataSize);
xSemaphoreTake(mutex, portMAX_DELAY);
auto ret = WriteWithRetry(deviceAddress, registerAddress, data, size);
xSemaphoreGive(mutex);
return ret;
}
/* Execute a read transaction (composed of a write and a read operation). If one of these opeartion fails,
* it's retried once. If it fails again, an error is returned */
TwiMaster::ErrorCodes TwiMaster::ReadWithRetry(uint8_t deviceAddress, uint8_t registerAddress, uint8_t *data, size_t size) {
TwiMaster::ErrorCodes ret;
ret = Write(deviceAddress, &registerAddress, 1, false);
if(ret != ErrorCodes::NoError)
ret = Write(deviceAddress, &registerAddress, 1, false);
if(ret != ErrorCodes::NoError) return ret;
ret = Read(deviceAddress, data, size, true);
if(ret != ErrorCodes::NoError)
ret = Read(deviceAddress, data, size, true);
return ret;
}
/* Execute a write transaction. If it fails, it is retried once. If it fails again, an error is returned. */
TwiMaster::ErrorCodes TwiMaster::WriteWithRetry(uint8_t deviceAddress, uint8_t registerAddress, const uint8_t *data, size_t size) {
internalBuffer[0] = registerAddress;
std::memcpy(internalBuffer+1, data, size);
auto ret = Write(deviceAddress, internalBuffer, size+1, true);
if(ret != ErrorCodes::NoError)
ret = Write(deviceAddress, internalBuffer, size+1, true);
return ret;
}
TwiMaster::ErrorCodes TwiMaster::Read(uint8_t deviceAddress, uint8_t *buffer, size_t size, bool stop) {
twiBaseAddress->ADDRESS = deviceAddress;
twiBaseAddress->TASKS_RESUME = 0x1UL;
twiBaseAddress->RXD.PTR = (uint32_t)buffer;
twiBaseAddress->RXD.MAXCNT = size;
twiBaseAddress->TASKS_STARTRX = 1;
while(!twiBaseAddress->EVENTS_RXSTARTED && !twiBaseAddress->EVENTS_ERROR);
twiBaseAddress->EVENTS_RXSTARTED = 0x0UL;
txStartedCycleCount = DWT->CYCCNT;
uint32_t currentCycleCount;
while(!twiBaseAddress->EVENTS_LASTRX && !twiBaseAddress->EVENTS_ERROR) {
currentCycleCount = DWT->CYCCNT;
if ((currentCycleCount-txStartedCycleCount) > HwFreezedDelay) {
FixHwFreezed();
return ErrorCodes::TransactionFailed;
}
}
twiBaseAddress->EVENTS_LASTRX = 0x0UL;
if (stop || twiBaseAddress->EVENTS_ERROR) {
twiBaseAddress->TASKS_STOP = 0x1UL;
while(!twiBaseAddress->EVENTS_STOPPED);
twiBaseAddress->EVENTS_STOPPED = 0x0UL;
}
else {
twiBaseAddress->TASKS_SUSPEND = 0x1UL;
while(!twiBaseAddress->EVENTS_SUSPENDED);
twiBaseAddress->EVENTS_SUSPENDED = 0x0UL;
auto err = nrfx_twim_tx(&twim, deviceAddress, internalBuffer , size+1, false);
if(err != 0){
return TwiMaster::ErrorCodes::TransactionFailed;
}
if (twiBaseAddress->EVENTS_ERROR) {
twiBaseAddress->EVENTS_ERROR = 0x0UL;
}
return ErrorCodes::NoError;
}
TwiMaster::ErrorCodes TwiMaster::Write(uint8_t deviceAddress, const uint8_t *data, size_t size, bool stop) {
twiBaseAddress->ADDRESS = deviceAddress;
twiBaseAddress->TASKS_RESUME = 0x1UL;
twiBaseAddress->TXD.PTR = (uint32_t)data;
twiBaseAddress->TXD.MAXCNT = size;
twiBaseAddress->TASKS_STARTTX = 1;
while(!twiBaseAddress->EVENTS_TXSTARTED && !twiBaseAddress->EVENTS_ERROR);
twiBaseAddress->EVENTS_TXSTARTED = 0x0UL;
txStartedCycleCount = DWT->CYCCNT;
uint32_t currentCycleCount;
while(!twiBaseAddress->EVENTS_LASTTX && !twiBaseAddress->EVENTS_ERROR) {
currentCycleCount = DWT->CYCCNT;
if ((currentCycleCount-txStartedCycleCount) > HwFreezedDelay) {
FixHwFreezed();
return ErrorCodes::TransactionFailed;
}
}
twiBaseAddress->EVENTS_LASTTX = 0x0UL;
if (stop || twiBaseAddress->EVENTS_ERROR) {
twiBaseAddress->TASKS_STOP = 0x1UL;
while(!twiBaseAddress->EVENTS_STOPPED);
twiBaseAddress->EVENTS_STOPPED = 0x0UL;
}
else {
twiBaseAddress->TASKS_SUSPEND = 0x1UL;
while(!twiBaseAddress->EVENTS_SUSPENDED);
twiBaseAddress->EVENTS_SUSPENDED = 0x0UL;
}
if (twiBaseAddress->EVENTS_ERROR) {
twiBaseAddress->EVENTS_ERROR = 0x0UL;
uint32_t error = twiBaseAddress->ERRORSRC;
twiBaseAddress->ERRORSRC = error;
}
return ErrorCodes::NoError;
xSemaphoreGive(mutex);
return TwiMaster::ErrorCodes::NoError;
}
void TwiMaster::Sleep() {
while(twiBaseAddress->ENABLE != 0) {
twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Disabled << TWIM_ENABLE_ENABLE_Pos);
}
nrfx_twim_disable(&twim);
nrfx_twim_uninit(&twim);
nrf_gpio_cfg_default(6);
nrf_gpio_cfg_default(7);
NRF_LOG_INFO("[TWIMASTER] Sleep");
@ -200,30 +82,3 @@ void TwiMaster::Wakeup() {
Init();
NRF_LOG_INFO("[TWIMASTER] Wakeup");
}
/* Sometimes, the TWIM device just freeze and never set the event EVENTS_LASTTX.
* This method disable and re-enable the peripheral so that it works again.
* This is just a workaround, and it would be better if we could find a way to prevent
* this issue from happening.
* */
void TwiMaster::FixHwFreezed() {
NRF_LOG_INFO("I2C device frozen, reinitializing it!");
// Disable I²C
uint32_t twi_state = NRF_TWI1->ENABLE;
twiBaseAddress->ENABLE = TWIM_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
NRF_GPIO->PIN_CNF[params.pinScl] = ((uint32_t)GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos)
| ((uint32_t)GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
| ((uint32_t)GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)
| ((uint32_t)GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
| ((uint32_t)GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
NRF_GPIO->PIN_CNF[params.pinSda] = ((uint32_t)GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos)
| ((uint32_t)GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
| ((uint32_t)GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)
| ((uint32_t)GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
| ((uint32_t)GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
// Re-enable I²C
twiBaseAddress->ENABLE = twi_state;
}

14
src/drivers/TwiMaster.h
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@ -3,13 +3,13 @@
#include <semphr.h>
#include <drivers/include/nrfx_twi.h> // NRF_TWIM_Type
#include <cstdint>
#include <nrfx_twim.h>
namespace Pinetime {
namespace Drivers {
class TwiMaster {
public:
enum class Modules { TWIM1 };
enum class Frequencies {Khz100, Khz250, Khz400};
enum class ErrorCodes {NoError, TransactionFailed};
struct Parameters {
uint32_t frequency;
@ -27,21 +27,13 @@ namespace Pinetime {
void Wakeup();
private:
ErrorCodes ReadWithRetry(uint8_t deviceAddress, uint8_t registerAddress, uint8_t* buffer, size_t size);
ErrorCodes WriteWithRetry(uint8_t deviceAddress, uint8_t registerAddress, const uint8_t* data, size_t size);
ErrorCodes Read(uint8_t deviceAddress, uint8_t* buffer, size_t size, bool stop);
ErrorCodes Write(uint8_t deviceAddress, const uint8_t* data, size_t size, bool stop);
void FixHwFreezed();
NRF_TWIM_Type* twiBaseAddress;
SemaphoreHandle_t mutex;
nrfx_twim_t twim;
const Modules module;
const Parameters params;
SemaphoreHandle_t mutex;
static constexpr uint8_t maxDataSize{8};
static constexpr uint8_t registerSize{1};
uint8_t internalBuffer[maxDataSize + registerSize];
uint32_t txStartedCycleCount = 0;
static constexpr uint32_t HwFreezedDelay{161000};
};
}
}

4
src/sdk_config.h
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@ -4992,7 +4992,7 @@
// <e> NRFX_TWIM_ENABLED - nrfx_twim - TWIM peripheral driver
//==========================================================
#ifndef NRFX_TWIM_ENABLED
#define NRFX_TWIM_ENABLED 0
#define NRFX_TWIM_ENABLED 1
#endif
// <q> NRFX_TWIM0_ENABLED - Enable TWIM0 instance
@ -5005,7 +5005,7 @@
#ifndef NRFX_TWIM1_ENABLED
#define NRFX_TWIM1_ENABLED 0
#define NRFX_TWIM1_ENABLED 1
#endif
// <o> NRFX_TWIM_DEFAULT_CONFIG_FREQUENCY - Frequency

8
src/systemtask/SystemTask.cpp
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@ -84,11 +84,15 @@ void SystemTask::Work() {
touchPanel.Init();
batteryController.Init();
motorController.Init();
motionSensor.SoftReset();
// Reset the TWI device because the motion sensor chip most probably crashed it...
twiMaster.Sleep();
twiMaster.Init();
motionSensor.Init();
settingsController.Init();
displayApp = std::make_unique<Pinetime::Applications::DisplayApp>(lcd, lvgl, touchPanel, batteryController, bleController,
dateTimeController, watchdogView, *this, notificationManager,
heartRateController, settingsController, motionController);