init

2025-12-11 09:43:42 +08:00
commit d8b2974133
1822 changed files with 280037 additions and 0 deletions
--- a/lib_i2c/examples/AN00156_i2c_master_example/src/main.xc
+++ b/lib_i2c/examples/AN00156_i2c_master_example/src/main.xc
@@ -0,0 +1,81 @@
+// Copyright 2013-2021 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+#include <xs1.h>
+#include "i2c.h"
+#include "debug_print.h"
+
+// I2C interface ports
+port p_scl = XS1_PORT_1E;
+port p_sda = XS1_PORT_1F;
+
+// FXOS8700CQ register address defines
+#define FXOS8700CQ_I2C_ADDR 0x1E
+#define FXOS8700CQ_XYZ_DATA_CFG_REG 0x0E
+#define FXOS8700CQ_CTRL_REG_1 0x2A
+#define FXOS8700CQ_DR_STATUS 0x0
+#define FXOS8700CQ_OUT_X_MSB 0x1
+#define FXOS8700CQ_OUT_Y_MSB 0x3
+#define FXOS8700CQ_OUT_Z_MSB 0x5
+
+int read_acceleration(client interface i2c_master_if i2c, int axis) {
+    i2c_regop_res_t result;
+
+    uint8_t msb_data = i2c.read_reg(FXOS8700CQ_I2C_ADDR, axis, result);
+    if (result != I2C_REGOP_SUCCESS) {
+      debug_printf("I2C read reg failed\n");
+      return 0;
+    }
+
+    uint8_t lsb_data = i2c.read_reg(FXOS8700CQ_I2C_ADDR, axis+1, result);
+    if (result != I2C_REGOP_SUCCESS) {
+      debug_printf("I2C read reg failed\n");
+      return 0;
+    }
+
+    int accel_val = (msb_data << 2) | (lsb_data >> 6);
+    if (accel_val & 0x200) {
+      accel_val -= 1023;
+    }
+    return accel_val;
+}
+
+void accelerometer(client interface i2c_master_if i2c) {
+  i2c_regop_res_t result;
+
+  // Configure FXOS8700CQ
+  result = i2c.write_reg(FXOS8700CQ_I2C_ADDR, FXOS8700CQ_XYZ_DATA_CFG_REG, 0x01);
+
+  if (result != I2C_REGOP_SUCCESS) {
+    debug_printf("I2C write reg failed\n");
+  }
+
+  // Enable FXOS8700CQ
+  result = i2c.write_reg(FXOS8700CQ_I2C_ADDR, FXOS8700CQ_CTRL_REG_1, 0x01);
+  if (result != I2C_REGOP_SUCCESS) {
+    debug_printf("I2C write reg failed\n");
+  }
+
+  while (1) {
+    // Wait for data ready from FXOS8700CQ
+    char status_data = 0;
+    do {
+      status_data = i2c.read_reg(FXOS8700CQ_I2C_ADDR, FXOS8700CQ_DR_STATUS, result);
+    } while (!status_data & 0x08);
+
+    int x = read_acceleration(i2c, FXOS8700CQ_OUT_X_MSB);
+    int y = read_acceleration(i2c, FXOS8700CQ_OUT_Y_MSB);
+    int z = read_acceleration(i2c, FXOS8700CQ_OUT_Z_MSB);
+
+    debug_printf("X = %d, Y = %d, Z = %d       \r", x, y, z);
+  }
+  // End accelerometer
+}
+
+int main(void) {
+  i2c_master_if i2c[1];
+  par {
+    i2c_master(i2c, 1, p_scl, p_sda, 10);
+    accelerometer(i2c[0]);
+  }
+  return 0;
+}