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unleashed-firmware/lib/signal_reader/signal_reader.c
gornekich 3d9a6a41db
FIX ISO15693 emulation (#3444) 
* furi hal gpio: allow enabling interrupt without handler
* signal reader: explicitly enable and disable gpio interrupt

Co-authored-by: あく <alleteam@gmail.com>
2024-02-14 09:37:04 +07:00

323 lines
12 KiB
C
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#include "signal_reader.h"
#include <limits.h>
#include <furi.h>
#include <furi_hal.h>
#include <furi_hal_gpio.h>
#include <stm32wbxx_ll_dma.h>
#include <stm32wbxx_ll_dmamux.h>
#include <stm32wbxx_ll_tim.h>
#include <stm32wbxx_ll_exti.h>
#include <furi_hal_bus.h>
#define SIGNAL_READER_DMA DMA2
#define SIGNAL_READER_CAPTURE_TIM (TIM16)
#define SIGNAL_READER_CAPTURE_TIM_CHANNEL LL_TIM_CHANNEL_CH1
#define SIGNAL_READER_DMA_GPIO LL_DMA_CHANNEL_2
#define SIGNAL_READER_DMA_GPIO_IRQ FuriHalInterruptIdDma2Ch2
#define SIGNAL_READER_DMA_GPIO_DEF SIGNAL_READER_DMA, SIGNAL_READER_DMA_GPIO
#define SIGNAL_READER_DMA_TRIGGER LL_DMA_CHANNEL_3
#define SIGNAL_READER_DMA_TRIGGER_IRQ FuriHalInterruptIdDma2Ch3
#define SIGNAL_READER_DMA_TRIGGER_DEF SIGNAL_READER_DMA, SIGNAL_READER_DMA_TRIGGER
#define SIGNAL_READER_DMA_CNT_SYNC LL_DMA_CHANNEL_5
#define SIGNAL_READER_DMA_CNT_SYNC_IRQ FuriHalInterruptIdDma2Ch5
#define SIGNAL_READER_DMA_CNT_SYNC_DEF SIGNAL_READER_DMA, SIGNAL_READER_DMA_CNT_SYNC
struct SignalReader {
size_t buffer_size;
const GpioPin* pin;
GpioPull pull;
SignalReaderPolarity polarity;
SignalReaderTrigger trigger;
uint16_t* gpio_buffer;
uint8_t* bitstream_buffer;
uint32_t cnt_en;
uint32_t tim_cnt_compensation;
uint32_t tim_arr;
SignalReaderEvent event;
SignalReaderEventData event_data;
SignalReaderCallback callback;
void* context;
};
#define GPIO_PIN_MAP(pin, prefix) \
(((pin) == (LL_GPIO_PIN_0)) ? prefix##0 : \
((pin) == (LL_GPIO_PIN_1)) ? prefix##1 : \
((pin) == (LL_GPIO_PIN_2)) ? prefix##2 : \
((pin) == (LL_GPIO_PIN_3)) ? prefix##3 : \
((pin) == (LL_GPIO_PIN_4)) ? prefix##4 : \
((pin) == (LL_GPIO_PIN_5)) ? prefix##5 : \
((pin) == (LL_GPIO_PIN_6)) ? prefix##6 : \
((pin) == (LL_GPIO_PIN_7)) ? prefix##7 : \
((pin) == (LL_GPIO_PIN_8)) ? prefix##8 : \
((pin) == (LL_GPIO_PIN_9)) ? prefix##9 : \
((pin) == (LL_GPIO_PIN_10)) ? prefix##10 : \
((pin) == (LL_GPIO_PIN_11)) ? prefix##11 : \
((pin) == (LL_GPIO_PIN_12)) ? prefix##12 : \
((pin) == (LL_GPIO_PIN_13)) ? prefix##13 : \
((pin) == (LL_GPIO_PIN_14)) ? prefix##14 : \
prefix##15)
#define GET_DMAMUX_EXTI_LINE(pin) GPIO_PIN_MAP(pin, LL_DMAMUX_REQ_GEN_EXTI_LINE)
SignalReader* signal_reader_alloc(const GpioPin* gpio_pin, uint32_t size) {
SignalReader* instance = malloc(sizeof(SignalReader));
instance->pin = gpio_pin;
instance->pull = GpioPullNo;
instance->buffer_size = size;
instance->gpio_buffer = malloc(sizeof(uint16_t) * size * 8);
instance->bitstream_buffer = malloc(size);
instance->event.data = &instance->event_data;
return instance;
}
void signal_reader_free(SignalReader* instance) {
furi_assert(instance);
furi_assert(instance->gpio_buffer);
furi_assert(instance->bitstream_buffer);
free(instance->gpio_buffer);
free(instance->bitstream_buffer);
free(instance);
}
void signal_reader_set_pull(SignalReader* instance, GpioPull pull) {
furi_assert(instance);
instance->pull = pull;
}
void signal_reader_set_polarity(SignalReader* instance, SignalReaderPolarity polarity) {
furi_assert(instance);
instance->polarity = polarity;
}
void signal_reader_set_sample_rate(
SignalReader* instance,
SignalReaderTimeUnit time_unit,
uint32_t time) {
furi_assert(instance);
UNUSED(time_unit);
instance->tim_arr = time;
}
void signal_reader_set_trigger(SignalReader* instance, SignalReaderTrigger trigger) {
furi_assert(instance);
instance->trigger = trigger;
}
static void furi_hal_sw_digital_pin_dma_rx_isr(void* context) {
SignalReader* instance = context;
uint16_t* gpio_buff_start = NULL;
uint8_t* bitstream_buff_start = NULL;
if(LL_DMA_IsActiveFlag_HT2(SIGNAL_READER_DMA)) {
LL_DMA_ClearFlag_HT2(SIGNAL_READER_DMA);
instance->event.type = SignalReaderEventTypeHalfBufferFilled;
gpio_buff_start = instance->gpio_buffer;
bitstream_buff_start = instance->bitstream_buffer;
if(instance->callback) {
furi_assert(gpio_buff_start);
furi_assert(bitstream_buff_start);
for(size_t i = 0; i < instance->buffer_size * 4; i++) {
if((i % 8) == 0) {
bitstream_buff_start[i / 8] = 0;
}
uint8_t bit = 0;
if(instance->polarity == SignalReaderPolarityNormal) {
bit = (gpio_buff_start[i] & instance->pin->pin) == instance->pin->pin;
} else {
bit = (gpio_buff_start[i] & instance->pin->pin) == 0;
}
bitstream_buff_start[i / 8] |= bit << (i % 8);
}
instance->event_data.data = bitstream_buff_start;
instance->event_data.len = instance->buffer_size / 2;
instance->callback(instance->event, instance->context);
}
}
if(LL_DMA_IsActiveFlag_TC2(SIGNAL_READER_DMA)) {
LL_DMA_ClearFlag_TC2(SIGNAL_READER_DMA);
instance->event.type = SignalReaderEventTypeFullBufferFilled;
gpio_buff_start = &instance->gpio_buffer[instance->buffer_size * 4];
bitstream_buff_start = &instance->bitstream_buffer[instance->buffer_size / 2];
if(instance->callback) {
furi_assert(gpio_buff_start);
furi_assert(bitstream_buff_start);
for(size_t i = 0; i < instance->buffer_size * 4; i++) {
if((i % 8) == 0) {
bitstream_buff_start[i / 8] = 0;
}
uint8_t bit = 0;
if(instance->polarity == SignalReaderPolarityNormal) {
bit = (gpio_buff_start[i] & instance->pin->pin) == instance->pin->pin;
} else {
bit = (gpio_buff_start[i] & instance->pin->pin) == 0;
}
bitstream_buff_start[i / 8] |= bit << (i % 8);
}
instance->event_data.data = bitstream_buff_start;
instance->event_data.len = instance->buffer_size / 2;
instance->callback(instance->event, instance->context);
}
}
}
void signal_reader_start(SignalReader* instance, SignalReaderCallback callback, void* context) {
furi_assert(instance);
furi_assert(callback);
instance->callback = callback;
instance->context = context;
// EXTI delay compensation
instance->tim_cnt_compensation = 9;
instance->cnt_en = SIGNAL_READER_CAPTURE_TIM->CR1;
instance->cnt_en |= TIM_CR1_CEN;
furi_hal_bus_enable(FuriHalBusTIM16);
// Capture timer config
LL_TIM_SetPrescaler(SIGNAL_READER_CAPTURE_TIM, 0);
LL_TIM_SetCounterMode(SIGNAL_READER_CAPTURE_TIM, LL_TIM_COUNTERMODE_UP);
LL_TIM_SetAutoReload(SIGNAL_READER_CAPTURE_TIM, instance->tim_arr);
LL_TIM_SetClockDivision(SIGNAL_READER_CAPTURE_TIM, LL_TIM_CLOCKDIVISION_DIV1);
LL_TIM_DisableARRPreload(SIGNAL_READER_CAPTURE_TIM);
LL_TIM_SetClockSource(SIGNAL_READER_CAPTURE_TIM, LL_TIM_CLOCKSOURCE_INTERNAL);
// Configure TIM channel CC1
LL_TIM_OC_InitTypeDef TIM_OC_InitStruct = {};
TIM_OC_InitStruct.OCMode = LL_TIM_OCMODE_FROZEN;
TIM_OC_InitStruct.OCState = LL_TIM_OCSTATE_DISABLE;
TIM_OC_InitStruct.OCNState = LL_TIM_OCSTATE_DISABLE;
TIM_OC_InitStruct.CompareValue = (instance->tim_arr / 2);
TIM_OC_InitStruct.OCPolarity = LL_TIM_OCPOLARITY_HIGH;
LL_TIM_OC_Init(
SIGNAL_READER_CAPTURE_TIM, SIGNAL_READER_CAPTURE_TIM_CHANNEL, &TIM_OC_InitStruct);
LL_TIM_OC_DisableFast(SIGNAL_READER_CAPTURE_TIM, SIGNAL_READER_CAPTURE_TIM_CHANNEL);
LL_TIM_SetTriggerOutput(SIGNAL_READER_CAPTURE_TIM, LL_TIM_TRGO_RESET);
LL_TIM_DisableMasterSlaveMode(SIGNAL_READER_CAPTURE_TIM);
// Start
LL_TIM_GenerateEvent_UPDATE(SIGNAL_READER_CAPTURE_TIM);
/* We need the EXTI to be configured as interrupt generating line, but no ISR registered */
furi_hal_gpio_init(
instance->pin, GpioModeInterruptRiseFall, instance->pull, GpioSpeedVeryHigh);
furi_hal_gpio_enable_int_callback(instance->pin);
/* Set DMAMUX request generation signal ID on specified DMAMUX channel */
LL_DMAMUX_SetRequestSignalID(
DMAMUX1, LL_DMAMUX_REQ_GEN_0, GET_DMAMUX_EXTI_LINE(instance->pin->pin));
/* Set the polarity of the signal on which the DMA request is generated */
LL_DMAMUX_SetRequestGenPolarity(DMAMUX1, LL_DMAMUX_REQ_GEN_0, LL_DMAMUX_REQ_GEN_POL_RISING);
/* Set the number of DMA requests that will be authorized after a generation event */
LL_DMAMUX_SetGenRequestNb(DMAMUX1, LL_DMAMUX_REQ_GEN_0, 1);
// Configure DMA Sync
LL_DMA_SetMemoryAddress(
SIGNAL_READER_DMA_CNT_SYNC_DEF, (uint32_t)&instance->tim_cnt_compensation);
LL_DMA_SetPeriphAddress(
SIGNAL_READER_DMA_CNT_SYNC_DEF, (uint32_t) & (SIGNAL_READER_CAPTURE_TIM->CNT));
LL_DMA_ConfigTransfer(
SIGNAL_READER_DMA_CNT_SYNC_DEF,
LL_DMA_DIRECTION_MEMORY_TO_PERIPH | LL_DMA_MODE_CIRCULAR | LL_DMA_PERIPH_NOINCREMENT |
LL_DMA_MEMORY_NOINCREMENT | LL_DMA_PDATAALIGN_HALFWORD | LL_DMA_MDATAALIGN_HALFWORD |
LL_DMA_PRIORITY_VERYHIGH);
LL_DMA_SetDataLength(SIGNAL_READER_DMA_CNT_SYNC_DEF, 1);
LL_DMA_SetPeriphRequest(SIGNAL_READER_DMA_CNT_SYNC_DEF, LL_DMAMUX_REQ_GENERATOR0);
// Configure DMA Sync
LL_DMA_SetMemoryAddress(SIGNAL_READER_DMA_TRIGGER_DEF, (uint32_t)&instance->cnt_en);
LL_DMA_SetPeriphAddress(
SIGNAL_READER_DMA_TRIGGER_DEF, (uint32_t) & (SIGNAL_READER_CAPTURE_TIM->CR1));
LL_DMA_ConfigTransfer(
SIGNAL_READER_DMA_TRIGGER_DEF,
LL_DMA_DIRECTION_MEMORY_TO_PERIPH | LL_DMA_PERIPH_NOINCREMENT | LL_DMA_MEMORY_NOINCREMENT |
LL_DMA_PDATAALIGN_HALFWORD | LL_DMA_MDATAALIGN_HALFWORD | LL_DMA_PRIORITY_VERYHIGH);
LL_DMA_SetDataLength(SIGNAL_READER_DMA_TRIGGER_DEF, 1);
LL_DMA_SetPeriphRequest(SIGNAL_READER_DMA_TRIGGER_DEF, LL_DMAMUX_REQ_GENERATOR0);
// Configure DMA Rx pin
LL_DMA_SetMemoryAddress(SIGNAL_READER_DMA_GPIO_DEF, (uint32_t)instance->gpio_buffer);
LL_DMA_SetPeriphAddress(SIGNAL_READER_DMA_GPIO_DEF, (uint32_t) & (instance->pin->port->IDR));
LL_DMA_ConfigTransfer(
SIGNAL_READER_DMA_GPIO_DEF,
LL_DMA_DIRECTION_PERIPH_TO_MEMORY | LL_DMA_MODE_CIRCULAR | LL_DMA_PERIPH_NOINCREMENT |
LL_DMA_MEMORY_INCREMENT | LL_DMA_PDATAALIGN_HALFWORD | LL_DMA_MDATAALIGN_HALFWORD |
LL_DMA_PRIORITY_HIGH);
LL_DMA_SetDataLength(SIGNAL_READER_DMA_GPIO_DEF, instance->buffer_size * 8);
LL_DMA_SetPeriphRequest(SIGNAL_READER_DMA_GPIO_DEF, LL_DMAMUX_REQ_TIM16_CH1);
// Configure DMA Channel CC1
LL_TIM_EnableDMAReq_CC1(SIGNAL_READER_CAPTURE_TIM);
LL_TIM_CC_EnableChannel(SIGNAL_READER_CAPTURE_TIM, SIGNAL_READER_CAPTURE_TIM_CHANNEL);
// Start DMA irq, higher priority than normal
furi_hal_interrupt_set_isr_ex(
SIGNAL_READER_DMA_GPIO_IRQ,
FuriHalInterruptPriorityHighest,
furi_hal_sw_digital_pin_dma_rx_isr,
instance);
// Start DMA Sync timer
LL_DMA_EnableChannel(SIGNAL_READER_DMA_CNT_SYNC_DEF);
// Start DMA Rx pin
LL_DMA_EnableChannel(SIGNAL_READER_DMA_GPIO_DEF);
// Strat timer
LL_TIM_SetCounter(SIGNAL_READER_CAPTURE_TIM, 0);
if(instance->trigger == SignalReaderTriggerNone) {
LL_TIM_EnableCounter(SIGNAL_READER_CAPTURE_TIM);
} else {
LL_DMA_EnableChannel(SIGNAL_READER_DMA_TRIGGER_DEF);
}
LL_DMAMUX_EnableRequestGen(DMAMUX1, LL_DMAMUX_REQ_GEN_0);
// Need to clear flags before enabling DMA !!!!
if(LL_DMA_IsActiveFlag_TC2(SIGNAL_READER_DMA)) LL_DMA_ClearFlag_TC1(SIGNAL_READER_DMA);
if(LL_DMA_IsActiveFlag_TE2(SIGNAL_READER_DMA)) LL_DMA_ClearFlag_TE1(SIGNAL_READER_DMA);
LL_DMA_EnableIT_TC(SIGNAL_READER_DMA_GPIO_DEF);
LL_DMA_EnableIT_HT(SIGNAL_READER_DMA_GPIO_DEF);
}
void signal_reader_stop(SignalReader* instance) {
furi_assert(instance);
furi_hal_interrupt_set_isr(SIGNAL_READER_DMA_GPIO_IRQ, NULL, NULL);
furi_hal_gpio_disable_int_callback(instance->pin);
// Deinit DMA Rx pin
LL_DMA_DeInit(SIGNAL_READER_DMA_GPIO_DEF);
// Deinit DMA Sync timer
LL_DMA_DeInit(SIGNAL_READER_DMA_CNT_SYNC_DEF);
// Deinit DMA Trigger timer
LL_DMA_DeInit(SIGNAL_READER_DMA_TRIGGER_DEF);
furi_hal_bus_disable(FuriHalBusTIM16);
}
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