lpcXpresso55s16 adc support

ArjunDinesh — Fri, 26 May 2023 11:17:38 GMT

Hi Team,

Please help me to provide the configuration steps and sample codes of adc read for lpcXpresso55s16 which has to be work with zephyr 3.3.99

Hi DerekSnell, Thanks for your immediate response. I referred the fRe: lpcXpresso55s16 adc support

ArjunDinesh — Sun, 28 May 2023 10:26:02 GMT

Hi Team,

I referred the following tutorial and the ADC reference of Zephyr :

https://www.youtube.com/watch?v=Y8FaEcAp_kY

https://docs.zephyrproject.org/latest/samples/drivers/adc/README.html

I made changes to the LPCXpresso55s16 board file by referring the board file of LPCXpresso55s69:

1) Added pinmux_lpadc0 configuration to lpcxpresso55s16-pinctrl.dtsi file
pinmux_lpadc0: pinmux_lpadc0 {
group0 {
pinmux = <ADC0_CH0_PIO0_23>,
<ADC0_CH8_PIO0_16>,
<ADC0_CH4_PIO1_8>,
<ADC0_CH12_PIO1_9>;
slew-rate = "standard";
nxp,analog-mode;
};
};

2) Enabled ADC through adding the below code to lpcxpresso55s16.dts file
&adc0 {
status = "okay";
pinctrl-0 = <&pinmux_lpadc0>;
pinctrl-names = "default";
};

3) Added 'adc' under supported section of the lpcxpresso55s16.yaml file
identifier: lpcxpresso55s16
name: NXP LPCXpresso55S16
type: mcu
arch: arm
ram: 96
flash: 256
toolchain:
- zephyr
- gnuarmemb
- xtools
supported:
- adc
- arduino_gpio
- arduino_i2c
- arduino_spi
- can
- gpio
- i2c
- spi
- usb_device

4) Added adc0 under the aliases field of the lpcxpresso55s16_common.dtsi file
aliases{
led0 = &red_led;
led1 = &green_led;
led2 = &blue_led;
sw0 = &btn_wk;
sw1 = &btn_usr;
sw2 = &btn_isp;
adcctrl = &adc0;
usart-0 = &flexcomm0;
magn0 = &fxos8700;
accel0 = &fxos8700;
};

I used the below code to read the adc samples from LPCXpresso55s16 through PIO0_23/ADC0_0 (12th pin - LPC55S16JBD64)

#include <stdint.h>
#include <stdio.h>
#include <zephyr.h>
#include <device.h>
#include <drivers/adc.h>
#include "logging/osal_log.h"
#include <can_com.h>
#include "can/osal_can.h"

#define ADC_DEVICE_NAME "DT_LABEL(DT_ALIAS(adcctrl))"
OSAL_LOG_MODULE_REGISTER(com_data_handler);

void main(void)
{
enum adc_gain {
ADC_GAIN_1_6,
ADC_GAIN_1_5,
ADC_GAIN_1_4,
ADC_GAIN_1_3,
ADC_GAIN_1_2,
ADC_GAIN_2_3,
ADC_GAIN_1,
ADC_GAIN_2,
ADC_GAIN_3,
ADC_GAIN_4,
ADC_GAIN_8,
ADC_GAIN_16,
ADC_GAIN_32,
ADC_GAIN_64,
};

enum adc_reference {
ADC_REF_VDD_1,
ADC_REF_VDD_1_2,
ADC_REF_VDD_1_3,
ADC_REF_VDD_1_4,
ADC_REF_INTERNAL,
ADC_REF_EXTERNAL0,
ADC_REF_EXTERNAL1,
};

enum adc_input_positive {
ADC_POSITIVE_INPUT_AIN0,
ADC_POSITIVE_INPUT_AIN1,
ADC_POSITIVE_INPUT_AIN2,
ADC_POSITIVE_INPUT_AIN3,
ADC_POSITIVE_INPUT_AIN4,
ADC_POSITIVE_INPUT_AIN5,
ADC_POSITIVE_INPUT_AIN6,
ADC_POSITIVE_INPUT_AIN7,
ADC_POSITIVE_INPUT_AIN8,
ADC_POSITIVE_INPUT_AIN9,
ADC_POSITIVE_INPUT_AIN10,
ADC_POSITIVE_INPUT_AIN11,
ADC_POSITIVE_INPUT_AIN12,
ADC_POSITIVE_INPUT_AIN13,
ADC_POSITIVE_INPUT_AIN14,
ADC_POSITIVE_INPUT_AIN15,
};

struct adc_channel_cfg {
uint32_t acquisition_time;
uint8_t channel_id;
enum adc_input_positive input_positive;
enum adc_gain gain;
enum adc_reference reference;
};

struct adc_sequence {
uint16_t *buffer;
uint16_t buffer_size;
uint8_t resolution;
uint8_t channels;
struct adc_channel_cfg *channels_cfg;
const struct adc_sequence_options *options;
uint32_t timeout;
bool calibrate;
};

const struct device *adc_dev;
struct adc_channel_cfg channel_cfg;
struct adc_sequence sequence;
uint16_t buffer[4];

adc_dev = device_get_binding(ADC_DEVICE_NAME);
if (!adc_dev) {
OSAL_LOG_INF("Failed to get ADC device\n");
return;
}

channel_cfg.gain = ADC_GAIN_1_6;
channel_cfg.reference = ADC_REF_INTERNAL;
channel_cfg.acquisition_time = ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 40);
channel_cfg.channel_id = 0;
channel_cfg.input_positive = ADC_POSITIVE_INPUT_AIN0;

sequence.buffer = buffer;
sequence.buffer_size = sizeof(buffer);
sequence.resolution = 16;
sequence.channels = 1;

sequence.options = NULL;
sequence.timeout = SYS_FOREVER_MS;
sequence.calibrate = false;
sequence.channels_cfg = &channel_cfg;

while (1) {
if (adc_read(adc_dev, &sequence) != 0) {
OSAL_LOG_INF("ADC read failed\n");
return;
}

OSAL_LOG_INF("ADC value: %u\n", buffer[0]);

k_sleep(K_SECONDS(1));
}
}

I am able to build the code without any error. But, after connecting the real LPCXpresso55s16 board and flashed the hex file into the board.
The output is showing error:

*** Booting Zephyr OS build zephyr-v3.3.0-3441-g3154e03c454a ***
[00:00:00.005,000] <inf> com_data_handler: Failed to get ADC device

I am not sure where I made mistakes. If there is any possibilities, please guide me to resolve this issue.
Any suggestions and corrections are greatly appreciated.

Thanks in advance.

Re: Hi DerekSnell, Thanks for your immediate response. I referred the fRe: lpcXpresso55s16 adc sup

ZhangJennie — Mon, 29 May 2023 01:12:57 GMT

HI ArjunDinesh

This is Zephr related question, please create a Discussion to GitHub:

https://github.com/zephyrproject-rtos/zephyr/discussions

Thanks,

Jun Zhang

Re: lpcXpresso55s16 adc support

ArjunDinesh — Tue, 30 May 2023 00:39:00 GMT

Hi Jun Zhang,

I posted the same query in github.

https://github.com/zephyrproject-rtos/zephyr/discussions/58309

Thanking you,

Arjun Dinesh

LPC MicrocontrollersのトピックlpcXpresso55s16 adc support

lpcXpresso55s16 adc support

Hi DerekSnell, Thanks for your immediate response. I referred the fRe: lpcXpresso55s16 adc support

Re: Hi DerekSnell, Thanks for your immediate response. I referred the fRe: lpcXpresso55s16 adc sup

Re: lpcXpresso55s16 adc support