LPC MicrocontrollersのトピックRe: LPC_PWM not found

LPC_PWM not found

thomasbrickell — Thu, 19 Mar 2020 20:46:52 GMT

Hi,

trying to compile a project that sets the PWM timer function but symbol is not defined.

It seems that in chip_lpc175x_6x.h there is a LPC_PWM1_BASE is defined address but I cant' find any PWM structure despite it being listed in the LPC17xx user manual. All of the members of the LPC_PWM seem to be set are that of the PCLK_PWM1 but this is not defined either. All I can find searching the header files in lpc_chip_175x_6x Project is the PWM1 base address, MCPWM base address, and something worrying commented FIXME: PWM drivers.!

Re: LPC_PWM not found

jeremyzhou — Fri, 20 Mar 2020 02:10:34 GMT

Hi Thomas Brickell,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
Before answering your question, I'd like to know what the demo project you mentioned above come from.

Have a great day,
TIC

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Re: LPC_PWM not found

thomasbrickell — Fri, 20 Mar 2020 11:33:17 GMT

Hi , thanks for the response,

It's not a demo project it's a project I have inherited from a another developer. It was initially developed on lpcxpresso from my understanding but I have moved it to mcuxpresso.

I am of course making the assumption here that the

#1. The project I have is complete as I have been assured and that LPC_PWM was not defined from the base address and the strut defined by the previous programmer.

#2. Because of #1 that the definition of LPC_PWM structure is supplid in the lpc open header files.

I have made this assumption because I have seen reference to the structure here.

LPC1768 PWM Programming Tutorial

And in other places. (Note I have tried the LPC_PWM1 as in example.)

Tommy

Re: LPC_PWM not found

thomasbrickell — Sat, 21 Mar 2020 12:02:39 GMT

FIXED. Posted for documentation.

I have had a chance to have another look around.

I have used the latest lpc_open libs.

The version of the lpc open in the project I have is an older version of hte lpc open includes which has the LPC_PWM defined via the route below.

chip_lpc175x_6x.h

#define LPC_PWM1_BASE 0x40018000

and

#define LPC_PWM ((LPC_PWM_T *) LPC_PWM1_BASE)

and in

pwm_17xx_40xx.h there is the definition of LPC_PWM_T

but in the latest version of chip_lpc175x_6x.h where in the old version (line 186)

#include "pwm_17xx_40xx.h"

we have instead

/* FIXME : PWM drivers */

So I stated a new work space and rather using the latest lpc_open download made sure imported the old version in the project.