ads1243
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///----------------------------------------------------------------------------- /// ADS1243 驱动 - Arduino Nano /// 硬件配置: CS 接地, PDWN 接 VDD ///----------------------------------------------------------------------------- #include <SPI.h> // ==================== 引脚定义 ==================== // CS 已接地，不需要定义 // PDWN 已接 VDD，不需要定义 const int PIN_DRDY = 9; // 数据就绪 const int PIN_LED = 13; // 板载 LED // ==================== SPI 设置 ==================== SPISettings spiSettings(250000, MSBFIRST, SPI_MODE1); // ==================== 寄存器地址 ==================== enum ADS1243_REG { SETUP_REG = 0x00, MUX_REG = 0x01, ACR_REG = 0x02, ODAC_REG = 0x03, DIO_REG = 0x04, DIR_REG = 0x05, IOCON_REG = 0x06, OCR0_REG = 0x07, OCR1_REG = 0x08, OCR2_REG = 0x09, FSR0_REG = 0x0A, FSR1_REG = 0x0B, FSR2_REG = 0x0C, DOR2_REG = 0x0D, DOR1_REG = 0x0E, DOR0_REG = 0x0F }; // ==================== 命令 ==================== enum ADS1243_CMD { RDATA_CMD = 0x01, RDATAC_CMD = 0x03, STOPC_CMD = 0x0F, RREG_CMD = 0x10, WREG_CMD = 0x50, SELFCAL_CMD = 0xF0, SELFOCAL_CMD = 0xF1, SELFGCAL_CMD = 0xF2, SYSOCAL_CMD = 0xF3, SYSGCAL_CMD = 0xF4, WAKEUP_CMD = 0xFB, DSYNC_CMD = 0xFC, SLEEP_CMD = 0xFD, RESET_CMD = 0xFE }; // ==================== 寄存器位定义 ==================== #define SETUP_BOCS 0x08 #define SETUP_GAIN_1 0x00 #define SETUP_GAIN_2 0x01 #define SETUP_GAIN_4 0x02 #define SETUP_GAIN_8 0x03 #define SETUP_GAIN_16 0x04 #define SETUP_GAIN_32 0x05 #define SETUP_GAIN_64 0x06 #define SETUP_GAIN_128 0x07 #define ACR_U_BIPOLAR 0x40 #define ACR_SPEED 0x20 #define ACR_BUFEN 0x10 #define ACR_RANGE 0x04 #define ACR_DR_15HZ 0x00 #define ACR_DR_7_5HZ 0x01 #define ACR_DR_3_75HZ 0x02 // ==================== 全局变量 ==================== int32_t adcValue; // ==================== SPI 事务宏（CS 已接地，无需控制） ==================== #define SPI_START() do { \ SPI.beginTransaction(spiSettings); \ } while(0) #define SPI_END() do { \ SPI.endTransaction(); \ } while(0) // ==================== 核心函数 ==================== /** * @brief 等待 DRDY 变为低电平（数据就绪） * @param timeout_ms 超时时间（毫秒） * @return true=就绪, false=超时 */ static bool waitDrdy(unsigned long timeout_ms = 1000) { unsigned long start = millis(); while (digitalRead(PIN_DRDY) == HIGH) { if (millis() - start > timeout_ms) { return false; } } return true; } /** * @brief 发送单字节命令 */ static void sendCmd(uint8_t cmd) { if (!waitDrdy()) return; SPI_START(); SPI.transfer(cmd); SPI_END(); // 校准命令需要额外等待 if (cmd == SELFCAL_CMD || cmd == SELFOCAL_CMD || cmd == SELFGCAL_CMD || cmd == SYSOCAL_CMD || cmd == SYSGCAL_CMD) { delay(200); } } /** * @brief 写寄存器 */ static void writeReg(uint8_t reg, uint8_t value) { if (!waitDrdy()) return; SPI_START(); SPI.transfer(WREG_CMD | reg); SPI.transfer(0x00); // 写入 1 个寄存器 SPI.transfer(value); SPI_END(); } /** * @brief 读寄存器 */ static uint8_t readReg(uint8_t reg) { if (!waitDrdy()) return 0xFF; SPI_START(); SPI.transfer(RREG_CMD | reg); SPI.transfer(0x00); // 读取 1 个寄存器 uint8_t value = SPI.transfer(0xFF); SPI_END(); return value; } /** * @brief 读取 ADC 转换数据（24位有符号） */ static int32_t readData(void) { if (!waitDrdy()) return 0; SPI_START(); SPI.transfer(RDATA_CMD); delayMicroseconds(50); // 等待数据准备 (t6) uint32_t raw = 0; raw |= (uint32_t)SPI.transfer(0xFF) << 16; raw |= (uint32_t)SPI.transfer(0xFF) << 8; raw |= (uint32_t)SPI.transfer(0xFF); SPI_END(); return (int32_t)(raw << 8) >> 8; } /** * @brief 读取完整的校准寄存器值（24位） */ static uint32_t readCalReg(uint8_t reg_high) { uint32_t value = 0; value |= (uint32_t)readReg(reg_high) << 16; value |= (uint32_t)readReg(reg_high + 1) << 8; value |= (uint32_t)readReg(reg_high + 2); return value; } /** * @brief 设置通道和增益 * @param pos_channel 正输入端 0~7 (AIN0~AIN7) * @param neg_channel 负输入端 0~7 (AIN0~AIN7) * @param gain 0~7 (1,2,4,8,16,32,64,128) */ static void setChannel(uint8_t pos_channel, uint8_t neg_channel, uint8_t gain) { if (pos_channel > 7 || neg_channel > 7) return; writeReg(MUX_REG, (pos_channel << 4) | neg_channel); writeReg(SETUP_REG, gain & 0x07); } /** * @brief 执行自校准（偏移+增益） */ static void selfCalibrate(void) { uint8_t setup = readReg(SETUP_REG); uint8_t current_gain = setup & 0x07; // 增益校准：PGA 必须为 1 if (current_gain != SETUP_GAIN_1) { writeReg(SETUP_REG, SETUP_GAIN_1); delay(10); } sendCmd(SELFGCAL_CMD); // 恢复增益并做偏移校准 if (current_gain != SETUP_GAIN_1) { writeReg(SETUP_REG, current_gain); delay(10); } sendCmd(SELFOCAL_CMD); } /** * @brief 打印所有寄存器（调试用） */ static void printRegisters(void) { Serial.println("--- ADC Registers ---"); Serial.print("SETUP: 0x"); Serial.println(readReg(SETUP_REG), HEX); Serial.print("MUX: 0x"); Serial.println(readReg(MUX_REG), HEX); Serial.print("ACR: 0x"); Serial.println(readReg(ACR_REG), HEX); Serial.print("ODAC: 0x"); Serial.println(readReg(ODAC_REG), HEX); Serial.print("DIO: 0x"); Serial.println(readReg(DIO_REG), HEX); Serial.print("DIR: 0x"); Serial.println(readReg(DIR_REG), HEX); Serial.print("IOCON: 0x"); Serial.println(readReg(IOCON_REG), HEX); uint32_t ocr = readCalReg(OCR2_REG); uint32_t fsr = readCalReg(FSR2_REG); Serial.print("OCR: 0x"); Serial.println(ocr, HEX); Serial.print("FSR: 0x"); Serial.println(fsr, HEX); Serial.println("----------------------"); } // ==================== 初始化 ==================== void setup() { pinMode(PIN_DRDY, INPUT); pinMode(PIN_LED, OUTPUT); // PDWN 已接 VDD，不需要控制 // CS 已接地，不需要控制 SPI.begin(); Serial.begin(115200); while (!Serial) { delay(10); } Serial.println("ADS1243 Initializing..."); Serial.println("CS = GND, PDWN = VDD"); // 1. 复位芯片 sendCmd(RESET_CMD); delay(10); // 2. 配置: AIN0(+) AIN1(-), 增益 1 setChannel(0, 1, SETUP_GAIN_1); // 3. 配置 ACR: 双极性 + 缓冲器 + 15SPS writeReg(ACR_REG, ACR_U_BIPOLAR | ACR_BUFEN | ACR_DR_15HZ); // 4. 自校准 Serial.println("Self-calibrating..."); selfCalibrate(); // 5. 打印寄存器 printRegisters(); Serial.println("Ready!"); } // ==================== 主循环 ==================== void loop() { adcValue = readData(); Serial.print("ADC: "); Serial.println(adcValue); digitalWrite(PIN_LED, HIGH); delay(50); digitalWrite(PIN_LED, LOW); delay(500); } - 暂无回复