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lm4f: Update miniblink example to demonstrate clock API

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Flashes the Red, Green and Blue diodes on the board, in order. The system clock
starts at 80MHz.
Pressing SW2 toggles the system clock between 80MHz, 57MHz, 40MHz ,20MHz, and
16MHz by changing the PLL divisor.
Pressing SW1 bypasses the PLL completely, and runs off the raw 16MHz clock
provided by the external crystal oscillator.
The LEDs will toggle at different speeds, depending on the system clock. The
system clock changes are handled within the interrupt service routine.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Alexandru Gagniuc
2013-01-09 02:12:21 -06:00
parent 4b2d9aca7b
commit 7ba100f569
2 changed files with 136 additions and 4 deletions
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21
examples/lm4f/stellaris-ek-lm4f120xl/miniblink/README
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@@ -2,8 +2,21 @@
README
------------------------------------------------------------------------------
Flashes the Red, Green and Blue diodes on the board, in order.
RED controlled by PF1
Green controlled by PF3
Blue controlled by PF2
This example demonstrates the following:
* Configuriong GPIO pins
* Toggling GPIO pins
* Setting up and using GPIO interrupts
* Unlocking protected GPIO pins
* Controlling the system clock
* Changing the system clock on the fly
Flashes the Red, Green and Blue diodes on the board, in order. The system clock
starts at 80MHz.
Pressing SW2 toggles the system clock between 80MHz, 57MHz, 40MHz ,20MHz, and
16MHz by changing the PLL divisor.
Pressing SW1 bypasses the PLL completely, and runs off the raw 16MHz clock
provided by the external crystal oscillator.
The LEDs will toggle at different speeds, depending on the system clock. The
system clock changes are handled within the interrupt service routine.