Fix DMA conflicts on JHEF745 target

[ot0tot]

The DMA assignment for Motor 3 conflicts with the gyro on SPI4. This PR changes the DMA request for Motor 3 so that it does not conflict, and enables bitbanged DShot which is preferred for F745 MCUs.

Before PR:

# status
MCU F745 Clock=216MHz, Vref=3.31V, Core temp=45degC
Stack size: 2048, Stack address: 0x20010000
Configuration: CONFIGURED, size: 3696, max available: 32768
Devices detected: SPI:1, I2C:1
Gyros detected: gyro 1 locked
GYRO=MPU6000, ACC=MPU6000, BARO=DPS310
OSD: MAX7456 (30 x 13)
BUILD KEY: d88c88713ceeed37a0ca6dd06f8a4fdc (4.4.3)
System Uptime: 20 seconds, Current Time: 2024-04-15T12:31:42.186+00:00
CPU:35%, cycle time: 125, GYRO rate: 8000, RX rate: 15, System rate: 9
Voltage: 1 * 0.01V (0S battery - NOT PRESENT)
I2C Errors: 0
FLASH: JEDEC ID=0x00ef4018 16M
Arming disable flags: RXLOSS CLI MSP

# dma show

Currently active DMA:
--------------------
DMA1 Stream 0: LED_STRIP
DMA1 Stream 1: FREE
DMA1 Stream 2: MOTOR 2
DMA1 Stream 3: SPI_MISO 2
DMA1 Stream 4: SPI_MOSI 2
DMA1 Stream 5: FREE
DMA1 Stream 6: FREE
DMA1 Stream 7: MOTOR 1
DMA2 Stream 0: SPI_MISO 1
DMA2 Stream 1: SPI_MOSI 4
DMA2 Stream 2: MOTOR 4
DMA2 Stream 3: MOTOR 3
DMA2 Stream 4: ADC
DMA2 Stream 5: SPI_MOSI 1
DMA2 Stream 6: FREE
DMA2 Stream 7: FREE

# timer show

Currently active Timers:
-----------------------
TIM1:
    CH1 : MOTOR 3
    CH2 : MOTOR 4
TIM2: FREE
TIM3:
    CH3 : MOTOR 1
    CH4 : MOTOR 2
TIM4:
    CH1 : LED_STRIP
TIM5: FREE
TIM6: FREE
TIM7: FREE
TIM8: FREE
TIM9: FREE
TIM10: FREE
TIM11: FREE
TIM12: FREE
TIM13: FREE
TIM14: FREE

After PR:

# 

# status
MCU F745 Clock=216MHz, Vref=3.31V, Core temp=40degC
Stack size: 2048, Stack address: 0x20010000
Configuration: CONFIGURED, size: 3696, max available: 32768
Devices detected: SPI:1, I2C:1
Gyros detected: gyro 1 locked dma
GYRO=MPU6000, ACC=MPU6000, BARO=DPS310
OSD: MAX7456 (30 x 13)
BUILD KEY: d88c88713ceeed37a0ca6dd06f8a4fdc (4.4.3)
System Uptime: 8 seconds, Current Time: 2024-04-15T13:04:17.049+00:00
CPU:30%, cycle time: 125, GYRO rate: 8000, RX rate: 15, System rate: 9
Voltage: 1 * 0.01V (0S battery - NOT PRESENT)
I2C Errors: 0
FLASH: JEDEC ID=0x00ef4018 16M
Arming disable flags: RXLOSS ANGLE CLI MSP

# timer show

Currently active Timers:
-----------------------
TIM1: FREE
TIM2: FREE
TIM3: FREE
TIM4:
    CH1 : LED_STRIP
TIM5: FREE
TIM6: FREE
TIM7: FREE
TIM8:
    CH2 : DSHOT_BITBANG 2
    CH4 : DSHOT_BITBANG 5
TIM9: FREE
TIM10: FREE
TIM11: FREE
TIM12: FREE
TIM13: FREE
TIM14: FREE

# dma show

Currently active DMA:
--------------------
DMA1 Stream 0: LED_STRIP
DMA1 Stream 1: FREE
DMA1 Stream 2: FREE
DMA1 Stream 3: SPI_MISO 2
DMA1 Stream 4: SPI_MOSI 2
DMA1 Stream 5: FREE
DMA1 Stream 6: FREE
DMA1 Stream 7: FREE
DMA2 Stream 0: SPI_MISO 4
DMA2 Stream 1: SPI_MOSI 4
DMA2 Stream 2: SPI_MISO 1
DMA2 Stream 3: DSHOT_BITBANG 2
DMA2 Stream 4: ADC
DMA2 Stream 5: SPI_MOSI 1
DMA2 Stream 6: FREE
DMA2 Stream 7: DSHOT_BITBANG 5

Or after PR with DShot bitbang disabled:

# 

# get dshot_bitbang
###WARNING: NO CUSTOM DEFAULTS FOUND###
dshot_bitbang = OFF
Allowed values: OFF, ON, AUTO
Default value: AUTO

dshot_bitbang_timer = AUTO
Allowed values: AUTO, TIM1, TIM8

# status
MCU F745 Clock=216MHz, Vref=3.31V, Core temp=45degC
Stack size: 2048, Stack address: 0x20010000
Configuration: CONFIGURED, size: 3696, max available: 32768
Devices detected: SPI:1, I2C:1
Gyros detected: gyro 1 locked dma
GYRO=MPU6000, ACC=MPU6000, BARO=DPS310
OSD: MAX7456 (30 x 13)
BUILD KEY: d88c88713ceeed37a0ca6dd06f8a4fdc (4.4.3)
System Uptime: 17 seconds, Current Time: 2024-04-15T15:05:21.403+00:00
CPU:29%, cycle time: 125, GYRO rate: 8000, RX rate: 15, System rate: 9
Voltage: 1 * 0.01V (0S battery - NOT PRESENT)
I2C Errors: 0
FLASH: JEDEC ID=0x00ef4018 16M
Arming disable flags: RXLOSS CLI MSP

# dma show

Currently active DMA:
--------------------
DMA1 Stream 0: LED_STRIP
DMA1 Stream 1: FREE
DMA1 Stream 2: MOTOR 2
DMA1 Stream 3: SPI_MISO 2
DMA1 Stream 4: SPI_MOSI 2
DMA1 Stream 5: FREE
DMA1 Stream 6: FREE
DMA1 Stream 7: MOTOR 1
DMA2 Stream 0: SPI_MISO 1
DMA2 Stream 1: SPI_MOSI 4
DMA2 Stream 2: MOTOR 4
DMA2 Stream 3: SPI_MISO 4
DMA2 Stream 4: ADC
DMA2 Stream 5: SPI_MOSI 1
DMA2 Stream 6: MOTOR 3
DMA2 Stream 7: FREE

# timer show

Currently active Timers:
-----------------------
TIM1:
    CH1 : MOTOR 3
    CH2 : MOTOR 4
TIM2: FREE
TIM3:
    CH3 : MOTOR 1
    CH4 : MOTOR 2
TIM4:
    CH1 : LED_STRIP
TIM5: FREE
TIM6: FREE
TIM7: FREE
TIM8: FREE
TIM9: FREE
TIM10: FREE
TIM11: FREE
TIM12: FREE
TIM13: FREE
TIM14: FREE

Thanks to @mmosca for testing.

[nerdCopter]

needs sync to unified-target?

[ot0tot]

needs sync to unified-target?

Looks like @haslinghuis took care of it. 👍 https://github.com/betaflight/unified-targets/pull/1301