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Add USART numbers and clarify SWD/SMA header instructions
*LED_R = PB12
====GPS(USART_2)====
*PA3(RX) = GPS TXD
*PA2(TX) = GPS RXD
====UART via USB Port(USART_1)====
*PA9(TX) = USB D+
*PA10(RX) = USB D-
====Si4063(SPI_1)====
*PB2 = CS/nSEL
|ARM 32F100R8T6B
|[https://www.mouser.com/datasheet/2/389/stm32f100cb-1851080.pdf Mouser]
|''Some recent batches of the DFM-17 have been using knockoff STM32s! The chip shortage strikes again!''
|-
|U2, U3, U4, U5, U7
==Hardware modifications==
====SMA Port to replace antenna& SWD header:====
The DFM-17 has solder pads for an SMA port and a SWD header. An [https://adafru.it/4048 Adafruit Skinny SWD SMT] connector and a generic SMA connected was used in the photo.
</gallery>
==Developing and Programming the board==
[[File:DFM-17 SWD Port pinout.png|thumb|A very crude diagram showing the standard SWD pinout overlaid onto the DFM-17 board]]
