UART Ports for 32 bit version

sumedhkaulgud · December 2015

Hi,

I have been working with the 32 bit version of the OpenBCI V3 board and I wanted to connect an external HC-06 bluetooth module to it to enable faster data transmission. I tried to change the pins for the Serial0 port(UART1) by making changes in the Board_defs.h file. However its not workiing the way it is supposed to. I tried switching to UART2 but one of its default ports is being used for SPI communication with the ADS. Is there some other library where I need to make the change in order to create the custom UART port?

Old Config:

#define _SER0_BASE _UART1_BASE_ADDRESS

#define _SER0_IRQ _UART1_ERR_IRQ

#define _SER0_VECTOR _UART_1_VECTOR

#define _SER0_IPL_ISR _UART1_IPL_ISR

#define _SER0_IPL _UART1_IPL_IPC

#define _SER0_SPL _UART1_SPL_IPC

#define _SER0_TX_OUT PPS_OUT_U1TX // RPB3R = U1TX = 1

#define _SER0_TX_PIN 14 // RB3 AN5/C1INA/C2INC/RTCC/RPB3/SCL2/PMWR/RB3

#define _SER0_RX_IN PPS_IN_U1RX // U1RXR = RPB13 = 3

#define _SER0_RX_PIN 6 // RB13 AN11/RPB13/CTPLS/PMRD/RB13

New Config:

#define _SER0_BASE _UART1_BASE_ADDRESS

#define _SER0_IRQ _UART1_ERR_IRQ

#define _SER0_VECTOR _UART_1_VECTOR

#define _SER0_IPL_ISR _UART1_IPL_ISR

#define _SER0_IPL _UART1_IPL_IPC

#define _SER0_SPL _UART1_SPL_IPC

#define _SER0_TX_OUT PPS_OUT_U1TX // RPB3R = U1TX = 1

#define _SER0_TX_PIN 13 // RB3 AN5/C1INA/C2INC/RTCC/RPB3/SCL2/PMWR/RB3

#define _SER0_RX_IN PPS_IN_U1RX // U1RXR = RPB13 = 3

#define _SER0_RX_PIN 18 // RB13 AN11/RPB13/CTPLS/PMRD/RB13

biomurph · December 2015

sumedhkaulgud

The PIC32MX250128B Peripheral Pin Select can be abit confusing. I'm referencing the datasheet

http://ww1.microchip.com/downloads/en/DeviceDoc/60001168H.pdf

Take a look at chapter 11, pages 130 and 132.

There you can see the input and output pin select possibilites. Cross referencing that list and the pins that we have broken out, it looks like you can use the following if you want to change the hardware UART pins:

name | port | chipKIT pin#

U1TX | B4 | 17

U1RX | A4 | 18

U2TX | B0 | 11

U2RX | B1 | 12

But don't take my word for it! Double check for yourself! I'm getting the chipKIT pin correlations from this site

http://www.digilentinc.com/Products/Detail.cfm?Prod=CHIPKIT-DP32

UART Ports for 32 bit version

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