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Merge pull request #2631 from cleanflight/fix-f4-transponder 

Fix F4 transponder transponder.
This commit is contained in:
Dominic Clifton 2017-02-27 20:41:26 +00:00 committed by Dominic Clifton
parent 2ca124f747
commit 37496e3d0f
2 changed files with 38 additions and 15 deletions
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41
src/main/drivers/transponder_ir.c
View File

@ -32,6 +32,27 @@
#include "transponder_ir.h"
#if defined(STM32F3)
#define TRANSPONDER_TIMER_PERIOD 156
#define TRANSPONDER_TIMER_HZ 72000000
#elif defined(STM32F4)
#define TRANSPONDER_TIMER_PERIOD 184
#define TRANSPONDER_TIMER_HZ 84000000
#else
#error "Transponder not supported on this MCU."
#endif
#define BIT_TOGGLE_1 (TRANSPONDER_TIMER_PERIOD / 2)
#define BIT_TOGGLE_0 0
#define TRANSPONDER_BITS_PER_BYTE 10 // start + 8 data + stop
#define TRANSPONDER_DATA_LENGTH 6
#define TRANSPONDER_TOGGLES_PER_BIT 11
#define TRANSPONDER_GAP_TOGGLES 1
#define TRANSPONDER_TOGGLES (TRANSPONDER_TOGGLES_PER_BIT + TRANSPONDER_GAP_TOGGLES)
#define TRANSPONDER_DMA_BUFFER_SIZE ((TRANSPONDER_TOGGLES_PER_BIT + 1) * TRANSPONDER_BITS_PER_BYTE * TRANSPONDER_DATA_LENGTH)
/*
* Implementation note:
* Using around over 700 bytes for a transponder DMA buffer is a little excessive, likely an alternative implementation that uses a fast
@ -40,7 +61,13 @@
*
* On an STM32F303CC 720 bytes is currently fine and that is the target for which this code was designed for.
*/
#if defined(STM32F3)
uint8_t transponderIrDMABuffer[TRANSPONDER_DMA_BUFFER_SIZE];
#elif defined(STM32F4)
uint32_t transponderIrDMABuffer[TRANSPONDER_DMA_BUFFER_SIZE];
#else
#error "Transponder not supported on this MCU."
#endif
volatile uint8_t transponderIrDataTransferInProgress = 0;
@ -99,11 +126,13 @@ void transponderIrHardwareInit(ioTag_t ioTag)
RCC_ClockCmd(timerRCC(timer), ENABLE);
uint16_t prescalerValue = (uint16_t)(SystemCoreClock / timerClockDivisor(timer) / TRANSPONDER_TIMER_HZ) - 1;
/* Time base configuration */
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 156;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_Period = TRANSPONDER_TIMER_PERIOD;
TIM_TimeBaseStructure.TIM_Prescaler = prescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(timer, &TIM_TimeBaseStructure);
@ -149,8 +178,14 @@ void transponderIrHardwareInit(ioTag_t ioTag)
DMA_InitStructure.DMA_BufferSize = TRANSPONDER_DMA_BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
#if defined(STM32F3)
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
#elif defined(STM32F4)
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
#endif
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
#if defined(STM32F3)

12
src/main/drivers/transponder_ir.h
View File

@ -19,17 +19,6 @@
#include "io_types.h"
#define TRANSPONDER_BITS_PER_BYTE 10 // start + 8 data + stop
#define TRANSPONDER_DATA_LENGTH 6
#define TRANSPONDER_TOGGLES_PER_BIT 11
#define TRANSPONDER_GAP_TOGGLES 1
#define TRANSPONDER_TOGGLES (TRANSPONDER_TOGGLES_PER_BIT + TRANSPONDER_GAP_TOGGLES)
#define TRANSPONDER_DMA_BUFFER_SIZE ((TRANSPONDER_TOGGLES_PER_BIT + 1) * TRANSPONDER_BITS_PER_BYTE * TRANSPONDER_DATA_LENGTH)
#define BIT_TOGGLE_1 78 // (156 / 2)
#define BIT_TOGGLE_0 0
bool transponderIrInit();
void transponderIrDisable(void);
@ -43,5 +32,4 @@ void transponderIrTransmit(void);
bool isTransponderIrReady(void);
extern uint8_t transponderIrDMABuffer[TRANSPONDER_DMA_BUFFER_SIZE];
extern volatile uint8_t transponderIrDataTransferInProgress;