1 files changed, 75 insertions, 0 deletions
diff --git a/testhal/STM32F1xx/I2C/max1236.c b/testhal/STM32F1xx/I2C/max1236.c
new file mode 100644
index 000000000..09e2c8b35
--- /dev/null
+++ b/testhal/STM32F1xx/I2C/max1236.c
@@ -0,0 +1,75 @@
+/**
+ * Maxim ADC has not so suitable default settings after startup.
+ * So we will create init function to tune this ADC.
+ */
+
+#include <stdlib.h>
+
+#include "ch.h"
+#include "hal.h"
+
+#include "max1236.h"
+
+
+#define max1236_addr 0b0110100
+
+
+/* Data buffers */
+static i2cblock_t max1236_rx_data[MAX1236_RX_DEPTH];
+static i2cblock_t max1236_tx_data[MAX1236_TX_DEPTH];
+/* ADC results */
+static uint16_t ch1 = 0, ch2 = 0, ch3 = 0, ch4 = 0;
+
+
+/* Error trap */
+static void i2c_max1236_error_cb(I2CDriver *i2cp, const I2CSlaveConfig *i2cscfg){
+  (void)i2cscfg;
+  int status = 0;
+  status = i2cp->id_i2c->SR1;
+  while(TRUE);
+}
+
+
+/* This callback raise up when transfer finished */
+static void i2c_max1236_cb(I2CDriver *i2cp, const I2CSlaveConfig *i2cscfg){
+  (void)*i2cp;
+  (void)*i2cscfg;
+  /* get ADC data */
+}
+
+
+/* ADC maxim MAX1236 config */
+
+static const I2CSlaveConfig max1236 = {
+		i2c_max1236_cb,
+    i2c_max1236_error_cb,
+};
+
+
+/**
+ * Initilization routine. See datasheet on page 13 to understand
+ * how to initialize ADC.
+ */
+void init_max1236(void){
+  /* this data we must send via IC to setup ADC */
+  max1236_tx_data[0] = 0b10000011; /* config register content. Consult datasheet */
+  max1236_tx_data[1] = 0b00000111; /* config register content. Consult datasheet */
+
+  /* transmit out 2 bytes */
+  i2cAcquireBus(&I2CD2);
+  i2cMasterTransmit(&I2CD2, &max1236, max1236_addr, max1236_tx_data, 2, max1236_rx_data, 0);
+  i2cReleaseBus(&I2CD2);
+}
+
+
+/* Now simply read 8 bytes to get all 4 ADC channels */
+void read_max1236(void){
+  i2cAcquireBus(&I2CD2);
+  i2cMasterReceive(&I2CD2, &max1236, max1236_addr, max1236_rx_data, 8);
+  i2cReleaseBus(&I2CD2);
+
+  ch1 = ((max1236_rx_data[0] & 0xF) << 8) + max1236_rx_data[1];
+  ch2 = ((max1236_rx_data[2] & 0xF) << 8) + max1236_rx_data[3];
+  ch3 = ((max1236_rx_data[4] & 0xF) << 8) + max1236_rx_data[5];
+  ch4 = ((max1236_rx_data[6] & 0xF) << 8) + max1236_rx_data[7];
+}