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Fork of
MMA8451Q8a
by 
Stanley Cohen
Diff: MMA8451Q.cpp
- Revision:
- 0:6149091f755d
- Child:
- 1:d2630136d51e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MMA8451Q.cpp Thu Oct 11 10:54:16 2012 +0000
@@ -0,0 +1,63 @@
+#include "MMA8451Q.h"
+
+#define REG_WHO_AM_I 0x0D
+#define REG_CTRL_REG_1 0x2A
+#define REG_OUT_X_MSB 0x01
+#define REG_OUT_Y_MSB 0x03
+#define REG_OUT_Z_MSB 0x05
+
+#define UINT14_MAX 16383
+
+MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
+ // activate the peripheral
+ uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
+ write_regs(data, 2);
+}
+
+MMA8451Q::~MMA8451Q() { }
+
+uint8_t MMA8451Q::getWhoAmI() {
+ uint8_t who_am_i = 0;
+ read_regs(REG_WHO_AM_I, &who_am_i, 1);
+ return who_am_i;
+}
+
+int16_t MMA8451Q::getAccX() {
+ return getAccAxis(REG_OUT_X_MSB);
+}
+
+int16_t MMA8451Q::getAccY() {
+ return getAccAxis(REG_OUT_Y_MSB);
+}
+
+int16_t MMA8451Q::getAccZ() {
+ return getAccAxis(REG_OUT_Z_MSB);
+}
+
+void MMA8451Q::getAccAllAxis(int16_t * res) {
+ res[0] = getAccX();
+ res[1] = getAccY();
+ res[2] = getAccZ();
+}
+
+int16_t MMA8451Q::getAccAxis(uint8_t addr) {
+ int16_t acc;
+ uint8_t res[2];
+ read_regs(addr, res, 2);
+
+ acc = (res[0] << 6) | (res[1] >> 2);
+ if (acc > UINT14_MAX/2)
+ acc -= UINT14_MAX;
+
+ return acc;
+}
+
+void MMA8451Q::read_regs(int addr, uint8_t * data, int len) {
+ char t[1] = {addr};
+ m_i2c.write(m_addr, t, 1, true);
+ m_i2c.read(m_addr, (char *)data, len);
+}
+
+void MMA8451Q::write_regs(uint8_t * data, int len) {
+ m_i2c.write(m_addr, (char *)data, len);
+}