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Improve SPI driver (use a mutex to prevent race conditions).

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This commit is contained in:
JF 2020-05-17 09:35:01 +02:00
parent 9753967d8a
commit 79131f4fe3
2 changed files with 23 additions and 16 deletions
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35
src/drivers/SpiMaster.cpp
View file

@ -9,7 +9,8 @@ using namespace Pinetime::Drivers;
SpiMaster::SpiMaster(const SpiMaster::SpiModule spi, const SpiMaster::Parameters &params) :
spi{spi}, params{params} {
mutex = xSemaphoreCreateBinary();
ASSERT(mutex != NULL);
}
bool SpiMaster::Init() {
@ -68,6 +69,8 @@ bool SpiMaster::Init() {
NRFX_IRQ_PRIORITY_SET(SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQn,2);
NRFX_IRQ_ENABLE(SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQn);
xSemaphoreGive(mutex);
return true;
}
@ -82,6 +85,7 @@ void SpiMaster::SetupWorkaroundForFtpan58(NRF_SPIM_Type *spim, uint32_t ppi_chan
NRF_PPI->CH[ppi_channel].EEP = (uint32_t) &NRF_GPIOTE->EVENTS_IN[gpiote_channel];
NRF_PPI->CH[ppi_channel].TEP = (uint32_t) &spim->TASKS_STOP;
NRF_PPI->CHENSET = 1U << ppi_channel;
spiBaseAddress->EVENTS_END = 0;
// Disable IRQ
spim->INTENCLR = (1<<6);
@ -94,13 +98,16 @@ void SpiMaster::DisableWorkaroundForFtpan58(NRF_SPIM_Type *spim, uint32_t ppi_ch
NRF_PPI->CH[ppi_channel].EEP = 0;
NRF_PPI->CH[ppi_channel].TEP = 0;
NRF_PPI->CHENSET = ppi_channel;
spiBaseAddress->EVENTS_END = 0;
spim->INTENSET = (1<<6);
spim->INTENSET = (1<<1);
spim->INTENSET = (1<<19);
}
void SpiMaster::OnEndEvent() {
if(!busy) return;
if(currentBufferAddr == 0) {
return;
}
auto s = currentBufferSize;
if(s > 0) {
@ -113,21 +120,21 @@ void SpiMaster::OnEndEvent() {
} else {
uint8_t* buffer = nullptr;
size_t size = 0;
busy = false;
if(taskToNotify != nullptr) {
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
vTaskNotifyGiveFromISR(taskToNotify, &xHigherPriorityTaskWoken);
portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
}
if(taskToNotify != nullptr) {
nrf_gpio_pin_set(this->pinCsn);
currentBufferAddr = 0;
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
vTaskNotifyGiveFromISR(taskToNotify, &xHigherPriorityTaskWoken);
xSemaphoreGiveFromISR(mutex, &xHigherPriorityTaskWoken);
portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
}
nrf_gpio_pin_set(pinCsn);
}
}
void SpiMaster::OnStartedEvent() {
if(!busy) return;
}
void SpiMaster::PrepareTx(const volatile uint32_t bufferAddress, const volatile size_t size) {
@ -142,10 +149,9 @@ void SpiMaster::PrepareTx(const volatile uint32_t bufferAddress, const volatile
bool SpiMaster::Write(const uint8_t *data, size_t size) {
if(data == nullptr) return false;
auto ok = xSemaphoreTake(mutex, portMAX_DELAY);
ASSERT(ok == true);
taskToNotify = xTaskGetCurrentTaskHandle();
while(busy) {
asm("nop");
}
if(size == 1) {
SetupWorkaroundForFtpan58(spiBaseAddress, 0,0);
@ -157,7 +163,6 @@ bool SpiMaster::Write(const uint8_t *data, size_t size) {
currentBufferAddr = (uint32_t)data;
currentBufferSize = size;
busy = true;
auto currentSize = std::min((size_t)255, (size_t)currentBufferSize);
PrepareTx(currentBufferAddr, currentSize);
@ -167,7 +172,7 @@ bool SpiMaster::Write(const uint8_t *data, size_t size) {
if(size == 1) {
while (spiBaseAddress->EVENTS_END == 0);
busy = false;
xSemaphoreGive(mutex);
}
return true;

4
src/drivers/SpiMaster.h
View file

@ -7,6 +7,8 @@
#include <task.h>
#include "BufferProvider.h"
#include <semphr.h>
namespace Pinetime {
namespace Drivers {
class SpiMaster {
@ -51,10 +53,10 @@ namespace Pinetime {
SpiMaster::SpiModule spi;
SpiMaster::Parameters params;
volatile bool busy = false;
volatile uint32_t currentBufferAddr = 0;
volatile size_t currentBufferSize = 0;
volatile TaskHandle_t taskToNotify;
SemaphoreHandle_t mutex;
};
}
}