EM357-RTR datasheet(73/240 Pages) ETC2

73 / 240 page

EM351 / EM357

8.2

Configuration

Before using a serial controller, configure and initialize it as follows:

Set up the parameters specific to the operating mode (master/slave for SPI, baud rate for UART, etc.).

Configure the GPIO pins used by the serial controller as shown in Table 8-1 and Table 8-2. Section 2 in

Chapter 7, GPIO shows how to configure GPIO pins.

If using DMA, set up the DMA and buffers. This is described fully in section 8.7.

If using interrupts, select edge- or level-triggered interrupts with the SCx_INTMODE register, enable

the desired second-level interrupt sources in the INT_SCxCFG register, and finally enable the top-level

SCx interrupt in the NVIC.

Write the serial interface operating mode — SPI, TWI, or UART — to the SCx_MODE register.

Table 8-1. SC1 GPIO Usage and Configuration

PB1

PB2

PB3

PB4

SPI - Master

SC1MOSI

Alternate Output

(push-pull)

SC1MISO

Input

SC1SCLK

Alternate Output

(push-pull)

(not used)

SPI - Slave

SC1MISO

Alternate Output

(push-pull)

SC1MOSI

Input

SC1SCLK

Input

SC1nSSEL

Input

TWI - Master

SC1SDA

Alternate Output

(open-drain)

SC1SCL

Alternate Output

(open-drain)

(not used)

UART

TXD

Alternate Output

(push-pull)

RXD

Input

nCTS

Input1

nRTS

Alternate Output (push-

pull)1

1 used if RTS/CTS hardware flow control is enabled.

Table 8-2. SC2 GPIO Usage and Configuration

PA0

PA1

PA2

PA3

SPI - Master

SC2MOSI

Alternate Output

(push-pull)

SC2MISO

Input

SC2SCLK

Alternate Output

(push-pull)

(not used)

SPI - Slave

SC2MOSI

Input

SC2MISO

Alternate Output

(push-pull)

SC2SCLK

Input

SC2nSSEL

Input

TWI - Master

(not used)

SC2SDA

Alternate Output

(open-drain)

SC2SCL

Alternate Output

(open-drain)

(not used)

8-2

120-035X-000D

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