开发板Seeed Studio XIAO ESP32C3
Seeed Studio XIAO ESP32C3是一款基于express的物联网迷你开发板 ESP32-C3 WiFi/蓝牙双模芯片ESP32-C3是一款32位RISC-V CPU，包含一个FPU(浮点单元)，用于32位单精度运算，具有强大的计算能力。 它具有出色的射频性能，支持IEEE 802.11 b/g/n WiFi和蓝牙5 (LE)协议。该电路板附带一个外部天线，以增加无线应用程序的信号强度。 它还具有小巧精致的外形，并结合了单面表面贴装设计。 它配备了丰富的接口，具有11个数字I/O，可作为PWM引脚和4个模拟I/O，可作为ADC引脚。支持UART、I2C、SPI等4种串行接口。在电路板上还有一个小的复位按钮和一个引导加载模式按钮。
ADC开发板
ADC评估板核心是AD7606C-18，AD7606C-18是一款18位、同步采样、模数转换数据采集系统(DAS)，具有八个通道。每个通道均包含模拟输入箝位保护、可编程增益放大器(PGA)、低通滤波器(LPF)和18位逐次逼近寄存器(SAR)模数转换器(ADC)。AD7606C-18还包含灵活的数字滤波器、低漂移、2.5 V精密基准电压源和用于驱动ADC的基准电压源缓冲区，以及灵活的并行和串行接口。
AD7606C-18采用5 V单电源供电，在所有通道以1 MSPS的吞吐量采样时，可适应以下输入范围：
双极单端：±12.5 V、±10 V、±6.25 V、±5 V和±2.5 V
单极单端：0 V至12.5 V、0 V至10 V和0 V至5 V
双极差分：±20 V、±12.5 V、±10 V和±5 V
输入箝位保护可承受高达±21 V的电压。由于采用单电源供电、片内滤波和高输入阻抗，因此无需外部驱动运算放大器（这些放大器需要双极电源）。对于吞吐率较低的应用，AD7606C-18灵活数字滤波器可用于提高噪声性能。
在硬件模式下，AD7606C-18与AD7608和AD7609完全兼容。在软件模式下，可以使用以下高级功能：
每个通道可选择模拟输入范围，并提供附加范围
每个通道可选择高带宽模式(220 kHz)
附加的过采样选项，过采样率高达256。
每通道的系统增益、系统失调和系统相位校准。
模拟输入开路检波器
诊断多路复用器
监测功能（串行外设接口(SPI)无效读和写、循环冗余校验(CRC)、持续忙碌监视器和复位检测）
框图如上，可以看到输入通道具有保护电路、PGA、LPF。
官网提供的原理图是空的，只有根据用户手册提供的说明使用了，官方手册使用的是EVAL-SDP-CH1Z (SDP-H1)这款FPGA开发板进行驱动，直接连接到底部HGDC接口。AD7606系列采用5V电源：
评估板带有转5V和3.3V LDO，通信逻辑接口电平是3.3V。
想要玩转开发板，首先就到弄明白板子的电源输入情况：
由于笔者手头没有SDP-H1控制板，因此需要将JP2接到B端，这样一来使用P4端子外部输入7~9V电源即可。
AD7606支持串行SPI和并行驱动，通过IO管脚选择，评估板默认是串行：
下面看看如果使用串行SPI接口，需要与主控连接的主要管脚：
总结如下：
RESET: 接MCU I/O, 配置输出模式，默认给低，高电平复位。
CONVST: 接MCU I/O,配置输出模式，当CONVST引脚从低电平转换为高电平时，ADC对模拟输入进行采样。
BUSY: 接MCU I/O, 配置输入模式，ADC转换完成时拉低。
FRSTDATA: 接MCU I/O, 配置输入模式，指示第一个通道V1正在回读(第18个时钟边沿后拉低)。这个管脚可以不接。
SPI配置为：模式2或者模式0
R_D_/SCLK: 串行时钟SCLK
DB9/DoutA:主机输入从机输出MISO
DB13/SDI: 主机输出从机输入MOSI
C_S_: 片选CS
再来看看数据手册描述的输入范围：
软件控制：
一开始打算使用stm32驱动它，参考网上大神们分享的AD7606驱动但是调试了一段时间没有成功；于是放弃了使用stm32驱动，先使用arduino驱动试试，这方面的开源分享比较多，在此感谢作者的开源分享。
#ifndef AD7606C_H
#define AD7606C_H
#include "arduino.h"
#include <SPI.h>
#define ADC_ALL_CH 8
#define PN20V0 0.00015258f
#define PN12V5 0.00009536f
#define PN10V0 0.00007629f
#define PN6V25 0.00004768f
#define PN5V00 0.00003815f
#define PN2V50 0.00001907f
#define PP12V5 0.00004768f
#define PP10V0 0.00003815f
#define PP5V00 0.00001907f
/*code to voltage*/
#define C2V(code, range_lsb) (code) * range_lsb
enum
{
ADC_CH1 = 0x0,
ADC_CH2 = 0x1,
ADC_CH3 = 0x2,
ADC_CH4 = 0x3,
ADC_CH5 = 0x4,
ADC_CH6 = 0x5,
ADC_CH7 = 0x6,
ADC_CH8 = 0x7
};
enum
{
BIPOLAR_MODE = 0,
UNIPOLAR_MODE = 1
};
class AD7606C
{
protected:
uint8_t _RESET;
uint8_t _CS;
uint8_t _CONVST;
uint8_t _FRSTDATA;
uint8_t _BUSY;
uint8_t _OS0;
uint8_t _OS1;
uint8_t _OS2;
uint8_t _RANGE;
uint8_t data_inc_status;
void reset();
void ipulse(uint8_t pin);
public:
void setOversampling(uint8_t);
void setRange(bool);
// uint16_t debug_val;
};
class AD7606C_Serial : public AD7606C
{
protected:
#define HSPI_MISO D9
#define HSPI_MOSI D10
#define HSPI_SCLK D8
#define HSPI_SS D7
SPIClass *hspi = NULL;
uint8_t channel_mode[ADC_ALL_CH];
public:
AD7606C_Serial(int CONVST, int BUSY);
uint8_t read_reg(uint8_t, uint8_t *);
uint8_t write_reg(uint8_t reg_addr, uint8_t reg_val);
uint8_t write_and_chk_reg(uint8_t reg_addr, uint8_t reg_val);
void convert_18bit_to_32bit(int32_t *unsigned_val, int32_t srcsz, int32_t *pdst);
uint8_t data_read(int32_t *data);
int32_t read(int32_t *data); // Read raw values from ADC
int32_t fast_read(int32_t *data); // fast read last conv raw values from ADC
void config(void);
void debug(void);
uint8_t check_id(void);
void get_all_reg_val(void);
void test_reg_rw(void);
};
#endif源文件
#include "AD7606C.h"
#define AD7606_REG_STATUS 0x01
#define AD7606_REG_CONFIG 0x02
#define AD7606_REG_RANGE_CH_ADDR(ch) (0x03 + ((ch) >> 1))
#define AD7606_REG_BANDWIDTH 0x07
#define AD7606_REG_OVERSAMPLING 0x08
#define AD7606_REG_GAIN_CH(ch) (0x09 + (ch))
#define AD7606_REG_OFFSET_CH(ch) (0x11 + (ch))
#define AD7606_REG_PHASE_CH(ch) (0x19 + (ch))
#define AD7606_REG_DIGITAL_DIAG_ENABLE 0x21
#define AD7606_REG_DIGITAL_DIAG_ERR 0x22
#define AD7606_REG_OPEN_DETECT_ENABLE 0x23
#define AD7606_REG_OPEN_DETECTED 0x24
#define AD7606_REG_AIN_OV_UV_DIAG_ENABLE 0x25
#define AD7606_REG_AIN_OV_DIAG_ERROR 0x26
#define AD7606_REG_AIN_UV_DIAG_ERROR 0x27
#define AD7606_REG_DIAGNOSTIC_MUX_CH(ch) (0x28 + ((ch) >> 1))
#define AD7606_REG_OPEN_DETECT_QUEUE 0x2C
#define AD7606_REG_CLK_FS_COUNTER 0x2D
#define AD7606_REG_CLK_OS_COUNTER 0x2E
#define AD7606_REG_ID 0x2F
#define DATA_SIZE 28
// Reset the AD7606
void AD7606C::reset()
{
digitalWrite(_RESET, 1);
delayMicroseconds(1);
digitalWrite(_RESET, 0);
delayMicroseconds(1);
}
void AD7606C::setOversampling(uint8_t times)
{
times > 6 ? times = 6 : times;
pinMode(_OS0, OUTPUT);
pinMode(_OS1, OUTPUT);
pinMode(_OS2, OUTPUT);
digitalWrite(_OS0, bitRead(B001, times));
digitalWrite(_OS1, bitRead(B010, times));
digitalWrite(_OS2, bitRead(B100, times));
}
void AD7606C::setRange(bool range)
{
pinMode(_RANGE, OUTPUT);
digitalWrite(_RANGE, range);
}
// Send a pulse to 0 or more pin for 1us
void AD7606C::ipulse(uint8_t pin)
{
digitalWrite(pin, LOW);
digitalWrite(pin, LOW); /* wait LP_CNV time */
digitalWrite(pin, HIGH);
digitalWrite(pin, HIGH);
}
AD7606C_Serial::AD7606C_Serial(int CONVST, int BUSY)
{
_CONVST = CONVST;
pinMode(_CONVST, OUTPUT);
digitalWrite(_CONVST, 0);
_BUSY = BUSY;
pinMode(_BUSY, INPUT_PULLUP);
hspi = new SPIClass(SPI);
hspi->begin(HSPI_SCLK, HSPI_MISO, HSPI_MOSI, HSPI_SS);
pinMode(hspi->pinSS(), OUTPUT);
digitalWrite(hspi->pinSS(), HIGH);
data_inc_status = 0;
}
// AD7606C_Serial::AD7606C_Serial(int FRSTDATA, int BUSY, int RESET)
// {
// _RESET = RESET;
// pinMode(_RESET, OUTPUT);
// _BUSY = BUSY;
// pinMode(_BUSY, OUTPUT);
// _FRSTDATA = FRSTDATA;
// pinMode(_FRSTDATA, INPUT);
// hspi = new SPIClass(HSPI); // default 12:SPI2_MISO 13:SPI2_MOSI 14:SPI2_SCLK 15:SPI2_CS
// #ifndef ALTERNATE_PINS
// // initialise hspi with default pins
// // SCLK = 14, MISO = 12, MOSI = 13, SS = 15
// hspi->begin();
// #else
// // alternatively route through GPIO pins
// hspi->begin(HSPI_SCLK, HSPI_MISO, HSPI_MOSI, HSPI_SS); // SCLK, MISO, MOSI, SS
// #endif
// pinMode(hspi->pinSS(), OUTPUT); // VSPI SS
// digitalWrite(hspi->pinSS(), HIGH);
// data_inc_status = 0;
// }
// AD7606C_Serial::AD7606C_Serial(int FRSTDATA, int BUSY, int RESET, int OS0, int OS1, int OS2, int RANGE)
// {
// _RESET = RESET;
// pinMode(_RESET, OUTPUT);
// _BUSY = BUSY;
// pinMode(_BUSY, OUTPUT);
// _OS0 = OS0;
// pinMode(_OS0, OUTPUT);
// _OS1 = OS1;
// pinMode(_OS1, OUTPUT);
// _OS2 = OS2;
// pinMode(_OS2, OUTPUT);
// _RANGE = RANGE;
// pinMode(_RANGE, OUTPUT);
// _FRSTDATA = FRSTDATA;
// pinMode(_FRSTDATA, INPUT);
// hspi = new SPIClass(HSPI); // default 12:SPI2_MISO 13:SPI2_MOSI 14:SPI2_SCLK 15:SPI2_CS
// #ifndef ALTERNATE_PINS
// // initialise hspi with default pins
// // SCLK = 14, MISO = 12, MOSI = 13, SS = 15
// hspi->begin();
// #else
// // alternatively route through GPIO pins
// hspi->begin(HSPI_SCLK, HSPI_MISO, HSPI_MOSI, HSPI_SS); // SCLK, MISO, MOSI, SS
// #endif
// pinMode(hspi->pinSS(), OUTPUT); // VSPI SS
// digitalWrite(hspi->pinSS(), HIGH);
// data_inc_status = 0;
// }
#define NO_OS_BIT(x) (1 << (x))
#define AD7606_RD_FLAG_MSK(x) (NO_OS_BIT(6) | ((x) & 0x3F))
#define AD7606_WR_FLAG_MSK(x) ((x) & 0x3F)
/**
* @brief Read a device register via SPI.
*
* This function performs CRC8 computation and checking if enabled in the device.
*
* @param reg_addr - Register address in device memory.
* @param reg_val - Pointer to the location where to store the register value.
*
* @return ret - return code.
* @note ad7606c-18 ds P.47
*/
uint8_t AD7606C_Serial::read_reg(uint8_t reg_addr, uint8_t *reg_val)
{
static uint16_t data_temp;
static uint8_t ret;
// data_temp = (0x2 | (reg_addr & 0x3F) << 2) << 8;// 0x3F is mask 0bxx111111 shit!!!
data_temp = AD7606_RD_FLAG_MSK(reg_addr) << 8;
hspi->beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE2));
digitalWrite(hspi->pinSS(), LOW); // pull SS slow to prep other end for transfer
hspi->transfer16(data_temp); // 发送第1帧
digitalWrite(hspi->pinSS(), HIGH); // pull ss high to signify end of data transfer
delayMicroseconds(1);
digitalWrite(hspi->pinSS(), LOW); // pull SS slow to prep other end for transfer
*reg_val = hspi->transfer16(data_temp) & 0xFF; // 发送第2帧（与第1帧内容相同） 并且取低8位为寄存器内容
digitalWrite(hspi->pinSS(), HIGH); // pull ss high to signify end of data transfer
hspi->endTransaction();
return ret;
}
/**
* @brief Write a device register via SPI.
*
* This function performs CRC8 computation and checking if enabled in the device.
*
* @param reg_addr - Register address in device memory.
* @param reg_data - Value to write to register.
*
* @return ret - return code.
* Example: -EIO - SPI communication error.
* -ENOTSUP - Device not in software mode.
* -EBADMSG - CRC computation mismatch.
* 0 - No errors encountered.
*/
uint8_t AD7606C_Serial::write_reg(uint8_t reg_addr, uint8_t reg_val)
{
static uint16_t data_temp;
static uint8_t ret;
static uint8_t debug;
/* Dummy read to place the chip in register mode. */
read_reg(reg_addr, &debug);
data_temp = AD7606_WR_FLAG_MSK(reg_addr) << 8 | (reg_val & 0xFF);
hspi->beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE2));
digitalWrite(hspi->pinSS(), LOW); // pull SS slow to prep other end for transfer
debug = hspi->transfer16(data_temp) & 0xFF; // 发送第1帧
digitalWrite(hspi->pinSS(), HIGH); // pull ss high to signify end of data transfer
hspi->endTransaction();
return ret;
}
uint8_t AD7606C_Serial::write_and_chk_reg(uint8_t reg_addr, uint8_t reg_val)
{
static uint16_t data_temp;
static uint8_t ret;
static uint8_t debug;
static uint8_t data_rd;
/* Dummy read to place the chip in register mode. */
read_reg(reg_addr, &debug);
data_temp = AD7606_WR_FLAG_MSK(reg_addr) << 8 | (reg_val & 0xFF);
hspi->beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE2));
digitalWrite(hspi->pinSS(), LOW); // pull SS slow to prep other end for transfer
debug = hspi->transfer16(data_temp) & 0xFF; // 发送第1帧
digitalWrite(hspi->pinSS(), HIGH); // pull ss high to signify end of data transfer
hspi->endTransaction();
read_reg(reg_addr, &data_rd);
if (data_rd != reg_val)
{
Serial.printf("[error]reg write fail!\r\n");
ret = 1;
}
return ret;
}
uint8_t AD7606C_Serial::check_id(void)
{
uint8_t ret = 0;
uint8_t byte1;
read_reg(0x2F, &byte1);
if ((byte1 & 0xF0) == 0x30)
{
if ((byte1 & 0x0F) != 0x02)
{
Serial.printf("[error]SILICON_REVISION is not 0x02, is:0x%x\r\n", byte1);
ret = 2;
}
else
{
Serial.printf("DEV_ID:D7606C-18 generic. SILICON_REVISION:0x%x\r\n", byte1 & 0x0F);
}
}
else
{
ret = 1;
Serial.printf("[error]DEV_ID is not D7606C-18 generic or AD7606C Init fail! data:0x%x\r\n", byte1);
}
return ret;
}
void AD7606C_Serial::get_all_reg_val(void)
{
uint8_t byte1;
for (uint8_t i = 0x01; i < 0x30; i++)
{
read_reg(i, &byte1);
Serial.printf("[debug]reg:0x%2x,data:0x%2x\r\n", i, byte1);
}
}
static const uint16_t tconv_max[] = {
1, /* AD7606_OSR_1 */
3, /* AD7606_OSR_2 */
5, /* AD7606_OSR_4 */
10, /* AD7606_OSR_8 */
20, /* AD7606_OSR_16 */
41, /* AD7606_OSR_32 */
81, /* AD7606_OSR_64 */
162, /* AD7606_OSR_128 */
324 /* AD7606_OSR_256 */
};
/**
* @enum ad7606_osr
* @brief Oversampling ratio
*/
enum ad7606_osr
{
/** Oversample by 1 */
AD7606_OSR_1,
/** Oversample by 2 */
AD7606_OSR_2,
/** Oversample by 4 */
AD7606_OSR_4,
/** Oversample by 8 */
AD7606_OSR_8,
/** Oversample by 16 */
AD7606_OSR_16,
/** Oversample by 32 */
AD7606_OSR_32,
/** Oversample by 64 */
AD7606_OSR_64,
/** Oversample by 128, available for chips that have software mode only */
AD7606_OSR_128,
/** Oversample by 256, available for chips that have software mode only */
AD7606_OSR_256
};
void AD7606C_Serial::config(void)
{
uint8_t byte1;
check_id();
write_and_chk_reg(AD7606_REG_CONFIG, 0x00); // CONFIG 0x02(数据中增加状态位，用于区分通道x的数据)
// write_and_chk_reg(AD7606_REG_CONFIG, 0x02);data_inc_status = 1;
write_and_chk_reg(AD7606_REG_BANDWIDTH, 0x00); // 全部使用低带宽
// write_and_chk_reg(AD7606_REG_OVERSAMPLING, 0xF8); // 使用最大过采样率 AD7606_OSR_256 & OS_PAD = 16 => busy=494.6us
write_and_chk_reg(AD7606_REG_OVERSAMPLING, 0x08); // 使用最大过采样率 AD7606_OSR_256 & OS_PAD = 0 => busy=255.6us
write_and_chk_reg(AD7606_REG_RANGE_CH_ADDR(1), 0xBB); // channel1 & channel2 => ±20 V differential range
write_and_chk_reg(AD7606_REG_RANGE_CH_ADDR(3), 0x5B); // channel3 => ±20 V differential range channel4 => 0 V to 5 V single-ended range.
write_and_chk_reg(AD7606_REG_RANGE_CH_ADDR(5), 0x65); // channel5 => 0 V to 5 V single-ended range channel6 => 0 V to 10 V single-ended range.
write_and_chk_reg(AD7606_REG_RANGE_CH_ADDR(7), 0x15); // channel7 => 0 V to 5 V single-ended range channel8 => ±5 V single-ended range.
channel_mode[ADC_CH1] = BIPOLAR_MODE;
channel_mode[ADC_CH2] = BIPOLAR_MODE;
channel_mode[ADC_CH3] = BIPOLAR_MODE;
channel_mode[ADC_CH4] = UNIPOLAR_MODE;
channel_mode[ADC_CH5] = UNIPOLAR_MODE;
channel_mode[ADC_CH6] = UNIPOLAR_MODE;
channel_mode[ADC_CH7] = UNIPOLAR_MODE;
channel_mode[ADC_CH8] = BIPOLAR_MODE;
write_reg(0, 0); // exti register mode & get into ADC mode
}
/* Internal function to copy the content of a buffer in 18-bit chunks to a 32-bit buffer by
* extending the chunks to 32-bit size. */
static int32_t cpy18b32b(uint8_t *psrc, uint32_t srcsz, uint32_t *pdst)
{
unsigned int i, j;
if (srcsz % 9)
return 1;
for (i = 0; i < srcsz; i += 9)
{
j = 4 * (i / 9);
pdst[j + 0] = ((uint32_t)(psrc[i + 0] & 0xff) << 10) | ((uint32_t)psrc[i + 1] << 2) | ((uint32_t)psrc[i + 2] >> 6);
pdst[j + 1] = ((uint32_t)(psrc[i + 2] & 0x3f) << 12) | ((uint32_t)psrc[i + 3] << 4) | ((uint32_t)psrc[i + 4] >> 4);
pdst[j + 2] = ((uint32_t)(psrc[i + 4] & 0x0f) << 14) | ((uint32_t)psrc[i + 5] << 6) | ((uint32_t)psrc[i + 6] >> 2);
pdst[j + 3] = ((uint32_t)(psrc[i + 6] & 0x03) << 16) | ((uint32_t)psrc[i + 7] << 8) | ((uint32_t)psrc[i + 8] >> 0);
}
return 0;
}
/* Internal function to copy the content of a buffer in 26-bit chunks to a 32-bit buffer by
* extending the chunks to 32-bit size. */
static int32_t cpy26b32b(uint8_t *psrc, uint32_t srcsz, uint32_t *pdst)
{
unsigned int i, j;
if (srcsz % 13)
return 1;
for (i = 0; i < srcsz; i += 13)
{
j = 4 * (i / 13);
pdst[j + 0] = ((uint32_t)(psrc[i + 0] & 0xff) << 18) | ((uint32_t)psrc[i + 1] << 10) | ((uint32_t)psrc[i + 2] << 2) | ((uint32_t)psrc[i + 3] >> 6);
pdst[j + 1] = ((uint32_t)(psrc[i + 3] & 0x3f) << 20) | ((uint32_t)psrc[i + 4] << 12) | ((uint32_t)psrc[i + 5] << 4) | ((uint32_t)psrc[i + 6] >> 4);
pdst[j + 2] = ((uint32_t)(psrc[i + 6] & 0x0f) << 22) | ((uint32_t)psrc[i + 7] << 14) | ((uint32_t)psrc[i + 8] << 6) | ((uint32_t)psrc[i + 9] >> 2);
pdst[j + 3] = ((uint32_t)(psrc[i + 9] & 0x03) << 24) | ((uint32_t)psrc[i + 10] << 16) | ((uint32_t)psrc[i + 11] << 8) | ((uint32_t)psrc[i + 12] >> 0);
}
return 0;
}
void AD7606C_Serial::convert_18bit_to_32bit(int32_t *unsigned_val, int32_t srcsz, int32_t *pdst)
{
unsigned int i;
for (i = 0; i < srcsz; i++)
{ // #Twos Complement Output Coding
// Bipolar Analog Input Ranges
if (channel_mode[i] == 0) // BIPOLAR_MODE
{
pdst[i] = (unsigned_val[i] & 0x00020000) ? (unsigned_val[i] | 0xFFFC0000) : unsigned_val[i];
}
else // UNIPOLAR_MODE
{
pdst[i] = unsigned_val[i];
}
}
}
/**
* @brief Read conversion data.
*
* --TODO:-This function performs CRC16 computation and checking if enabled in the device.
* If the status is enabled in device settings, each sample of data will contain
* status information in the lowest 8 bits.
*
* The output buffer provided by the user should be as wide as to be able to
* contain 1 sample from each channel since this function reads conversion data
* across all channels.
*
* @param data - Pointer to location of buffer where to store the data.
*
* @return ret - return code.
* Example: 1 - xxx error.
* 0 - No errors encountered.
*/
uint8_t AD7606C_Serial::data_read(int32_t *data)
{
uint8_t ret;
uint32_t sz;
int32_t i;
uint16_t crc, icrc;
uint8_t bits = 18;
uint8_t sbits = data_inc_status ? 8 : 0;
uint8_t nchannels = 8;
uint32_t data_temp[DATA_SIZE];
uint8_t data_buf[DATA_SIZE] = {0x00};
sz = nchannels * (bits + sbits);
/* Number of bits to read, corresponds to SCLK cycles in transfer.
* This should always be a multiple of 8 to work with most SPI's.
* With this chip family this holds true because we either:
* - multiply 8 channels * bits per sample
* - multiply 4 channels * bits per sample (always multiple of 2)
* Therefore, due to design reasons, we don't check for the
* remainder of this division because it is zero by design.
*/
sz /= 8; // 不包含status时为18个
memset(data_buf, 0, sz);
digitalWrite(hspi->pinSS(), LOW); // pull SS slow to prep other end for transfer
portDISABLE_INTERRUPTS();
for (uint8_t i = 0; i < sz; i++)
{
data_buf[i] = hspi->transfer(0x00);
}
portENABLE_INTERRUPTS();
digitalWrite(hspi->pinSS(), HIGH); // pull ss high to signify end of data transfer
switch (bits)
{
case 18:
if (data_inc_status)
{
ret = cpy26b32b(data_buf, sz, data_temp);
// TODO:
}
else
{
ret = cpy18b32b(data_buf, sz, data_temp);
convert_18bit_to_32bit((int32_t *)data_temp, 8, data);
}
if (ret)
return ret;
break;
// case 16:
// for (i = 0; i < nchannels; i++)
// {
// if (data_inc_status)
// {
// data[i] = (uint32_t)dev->data[i * 3] << 16;
// data[i] |= (uint32_t)dev->data[i * 3 + 1] << 8;
// data[i] |= (uint32_t)dev->data[i * 3 + 2];
// }
// else
// {
// data[i] = (uint32_t)dev->data[i * 2] << 8;
// data[i] |= (uint32_t)dev->data[i * 2 + 1];
// }
// }
// break;
default:
ret = 1;
break;
};
return ret;
}
/**
* @brief Blocking conversion start and data read.
*
* This function performs a conversion start and then proceeds to reading
* the conversion data.
*
* @param data - Pointer to location of buffer where to store the data.
*
* @return ret - return code.
* 0 - No errors encountered.
*/
int32_t AD7606C_Serial::read(int32_t *data)
{
int32_t ret;
uint8_t busy;
uint32_t timeout = tconv_max[AD7606_OSR_256];
ipulse(_CONVST);
/* Wait for BUSY falling edge */
while (timeout)
{
if (digitalRead(_BUSY) == 0)
break;
delayMicroseconds(1);
timeout--;
}
if (timeout == 0)
{
Serial.printf("[error]timeout\r\n");
return 1;
}
return data_read(data);
}
int32_t AD7606C_Serial::fast_read(int32_t *data)
{
int32_t ret;
uint8_t busy;
uint32_t timeout = tconv_max[AD7606_OSR_256];
ipulse(_CONVST);
data_read(data); // get last sample data
/* Wait for BUSY falling edge */
while (timeout)
{
if (digitalRead(_BUSY) == 0)
break;
delayMicroseconds(1);
timeout--;
}
if (timeout == 0)
{
Serial.printf("[error]timeout\r\n");
return 1;
}
return 0;
}测试
#include "AD7606C.h"
#define ADC_CONVST D0
#define ADC_BUSY D1
int32_t adc_raw_data[ADC_ALL_CH];
float adc_disp_val[ADC_ALL_CH];
AD7606C_Serial AD7606C_18(ADC_CONVST, ADC_BUSY);
#define RESET D2 //out
#define FRSTDATA D3 //in First Data Output. The FRSTDATA output signal indicates when the first channel, V1, is being read back on the parallel interface or the serial interface.
void setup()
{
Serial.begin(9600);
pinMode(RESET, OUTPUT);
pinMode(FRSTDATA, INPUT);
digitalWrite(RESET, HIGH);
delay(1);
digitalWrite(RESET, LOW);
Serial.println("ad7606 config begin");
delay(100);
Serial.println("ad7606 config begin");
AD7606C_18.config();
Serial.println("ad7606 config end");
}
void loop()
{
AD7606C_18.fast_read(adc_raw_data);
adc_disp_val[ADC_CH1] = C2V(adc_raw_data[ADC_CH1], PP5V00);
Serial.println(adc_disp_val[ADC_CH1]);
delay(1000);
}接线如下：
效果：
后面再想办法将驱动移植到stm32上，毕竟esp32c3性能不足，难以对采集数据做预处理。
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