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| 22:27.03 | wing0 | hello! i'm using eclipse + gcc + CMSIS to build code for a Cortex-M3 MCU (a LCP1768), and i need some directions... for example, i have some Demo code for blinking all the built in leds at 5Hz. But it's not clear to me how to figure out how can i reference one particular led for blinking, or a particular pin... where should i get this kind of information? |
| 22:28.43 | roxfan | what's your board? |
| 22:28.57 | roxfan | does it have pin labeled? or is there a schematics? |
| 22:29.09 | wing0 | hmm, i have the schematics |
| 22:29.23 | roxfan | trace the leds/pins to the cpu |
| 22:29.25 | wing0 | but inside my C++ code, how can i reference one particular pin? |
| 22:29.32 | roxfan | there you'll have something like P0_1 |
| 22:29.41 | roxfan | meaning "pin 1 of port 0" |
| 22:29.57 | roxfan | so you need to talk to the GPIO port 0 |
| 22:30.18 | roxfan | for lpc it's a structure called LPC_GPIO0 |
| 22:30.57 | wing0 | hmm, i see.. |
| 22:31.40 | roxfan | to set pin to 0 it would be something like LPC_GPIO0->FIOSET = 1<<1; |
| 22:31.50 | roxfan | err, to 1 |
| 22:32.31 | wing0 | let me do some testing, brb |
| 22:32.56 | roxfan | there are other registers in that struct to set pin functions, direction etc |
| 22:33.26 | roxfan | check the user manual, the naming is a bit different but shouldn't be too hard to figure out |
| 22:35.24 | wing0 | the LPC1768 manual, you mean? |
| 22:36.18 | roxfan | yes |
| 22:36.44 | roxfan | oh btw the structure itself is in LPC17xx.h |
| 22:36.58 | roxfan | and almost all the other hw regs |
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| 22:57.39 | wing0 | i think i need more reading about unions, brb again |
| 23:01.47 | roxfan | you can ignore them for now, just use top-level fields |
| 23:04.11 | wing0 | hmm, stills very unclear to me how to access one particular led... |
| 23:04.19 | wing0 | __INLINE static void LED_Config(void) { |
| 23:04.19 | wing0 | <PROTECTED> |
| 23:04.19 | wing0 | LPC_GPIO1->FIODIR = 0xFFFFFFFF; |
| 23:04.19 | wing0 | } |
| 23:04.27 | wing0 | let's take this code, for example |
| 23:04.53 | wing0 | he is using LPC_GPIO1->FIODIR |
| 23:05.28 | wing0 | why all my leds blink when i'm using LPC_GPIO1? it was not supposed to turn on just one particular led? |
| 23:10.19 | roxfan | FIODIR just sets the direction, it does not actually toggle the outputs |
| 23:11.01 | roxfan | though i guess they could change the state depending on the pullup/pulldown settings |
| 23:11.33 | roxfan | and GPIO1 is a port which groups several pins (up to 32) |
| 23:11.44 | roxfan | so you can affect all of them in one go |
| 23:35.53 | wing0 | so... some testing to figure out what is what is inevitable? |
| 23:37.25 | roxfan | no, it's all in the datasheet |
| 23:37.27 | roxfan | err |
| 23:37.36 | roxfan | manual |
| 23:37.45 | roxfan | you just need to look it up carefully |