libopencm3-examples

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Alexandru Gagniuc adddf9e418 lm4f: Update examples to the new GPIO API

We updated the GPIO API to use the AHB bus; however the AHP aperture for
GPIO ports A through J needs to be explicitly enabled at runtime. Accessing
the AHB aperture otherwise hardfaults.

To make the examples work again, we call gpio_enable_ahb_aperture() at the
start of main().

Since we're at it, we also take out the ugly register accesses in favor
of the new gpio functions.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

2013-06-06 11:26:59 -05:00

Makefile

lm4f: Add UART echo by interrupt example

2013-05-10 15:42:28 -05:00

README

lm4f: Add UART echo by interrupt example

2013-05-10 15:42:28 -05:00

uart_echo_interrupt.c

lm4f: Update examples to the new GPIO API

2013-06-06 11:26:59 -05:00

README

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README
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This example demonstrates the ease of setting up the UART with libopencm3, and
using UART interrupts. UART echo is achieved by echoing back received characters
from within the interrupt service routine. This has the advantage over using 
blocking reads and writes that the main program loop is freed for other tasks.

The UART is set up as 921600-8N1.

PA0 is the Rx pin, and PA1 is the Tx pin (from the LM4F perspective). These
pins are connected to the CDCACM interface on the debug chip, so no hardware is
necessary to test this example. Just connect the debug USB cable and use a
terminal program to open the ACM port with 921600-8N1.

For example:
$ picocom /dev/ttyACM0 -b921600