diff --git a/Hello_World/main.c b/Hello_World/main.c
index 9699fe2c1fdcd35b93b723c9acaa1ace80bed4f0..a7cc08578c55fe327d04e881e6759b7dabfaab79 100644
--- a/Hello_World/main.c
+++ b/Hello_World/main.c
@@ -49,11 +49,15 @@
 #include "tmr_utils.h"
 #include "i2c.h"
 #include "rtc.h"
+#include "spi.h"
 
 /***** Definitions *****/
 
 #define I2C_DEVICE	    MXC_I2C0_BUS0
 
+#define SPI SPI0
+#define SPI_SPEED       1000000  // Bit Rate
+
 /***** Globals *****/
 
 /***** Functions *****/
@@ -64,6 +68,46 @@ void I2C0_IRQHandler(void)
     return;
 }
 #endif
+
+uint32_t ecg_read_reg(uint8_t reg)
+{
+    spi_req_t req;
+    uint8_t tx_data[] = {(reg << 1) | 1, 0, 0, 0};
+    uint8_t rx_data[] = {0, 0, 0, 0};
+    req.tx_data = tx_data;
+    req.rx_data = rx_data;
+    req.len = 4;
+    req.bits = 8;
+    req.width = SPI17Y_WIDTH_1;
+    req.ssel = 0;
+    req.deass = 1;
+    req.ssel_pol = SPI17Y_POL_LOW;
+    req.tx_num = 0;
+    req.rx_num = 0;
+
+    SPI_MasterTrans(SPI, &req);
+
+    return (rx_data[1] << 16) | (rx_data[2] << 8) | rx_data[3];
+}
+
+void ecg_write_reg(uint8_t reg, uint32_t data)
+{
+    spi_req_t req;
+    uint8_t tx_data[] = {(reg << 1) | 0, 0, 0, 0};
+    uint8_t rx_data[] = {0, data >> 16, (data >> 8 ) & 0xFF, data & 0xFF};
+    req.tx_data = tx_data;
+    req.rx_data = rx_data;
+    req.len = 4;
+    req.bits = 8;
+    req.width = SPI17Y_WIDTH_1;
+    req.ssel = 0;
+    req.deass = 1;
+    req.ssel_pol = SPI17Y_POL_LOW;
+    req.tx_num = 0;
+    req.rx_num = 0;
+
+    SPI_MasterTrans(SPI, &req);
+}
 // *****************************************************************************
 int main(void)
 {
@@ -91,6 +135,23 @@ int main(void)
     // Enable 32 kHz output
     RTC_SquareWave(MXC_RTC, SQUARE_WAVE_ENABLED, F_32KHZ, NOISE_IMMUNE_MODE, NULL);
 
+    // Enable SPI
+    sys_cfg_spi_t spi17y_master_cfg;
+
+    spi17y_master_cfg.map = MAP_A;
+    spi17y_master_cfg.ss0 = Enable;
+    spi17y_master_cfg.ss1 = Disable;
+    spi17y_master_cfg.ss2 = Disable;
+
+    if (SPI_Init(SPI, 0, SPI_SPEED, spi17y_master_cfg) != 0) {
+        printf("Error configuring SPI\n");
+        while (1);
+    }
+
+    for(int i=0; i<0x20; i++) {
+        uint32_t val = ecg_read_reg(i);
+        printf("%02x: 0x%06x\n", i, val);
+    }
 
     while (1) {
         LED_On(0);
diff --git a/sdk/Libraries/CMSIS/Device/Maxim/MAX32665/Source/system_max32665.c b/sdk/Libraries/CMSIS/Device/Maxim/MAX32665/Source/system_max32665.c
index 0e515a35cb504cd5080472ea9e0dffb708c3558d..93e749218ea1aa8cc18b1b1e53fec46ff99ddc58 100644
--- a/sdk/Libraries/CMSIS/Device/Maxim/MAX32665/Source/system_max32665.c
+++ b/sdk/Libraries/CMSIS/Device/Maxim/MAX32665/Source/system_max32665.c
@@ -176,10 +176,12 @@ __weak void SystemInit(void)
 
     // All GPIO on port 1 to 1.8 V first
     MXC_GPIO1->vssel = 0;
-    MXC_GPIO0->vssel |= (1UL << 0) | (1UL << 1) | (1UL << 2) | (1UL << 3) | (1UL << 4) | (1UL << 5); // SDHC
+    MXC_GPIO1->vssel |= (1UL << 0) | (1UL << 1) | (1UL << 2) | (1UL << 3) | (1UL << 4) | (1UL << 5); // SDHC
     MXC_GPIO1->vssel |= (1 << 6) | (1 << 7); // GPIO to TOP
     MXC_GPIO1->vssel |= (1 << 14) | (1 << 15); // GPIO for RGB LEDs
 
+    MXC_GPIO1->vssel |= (1 << 8) | (1 << 9) |  (1 << 10) | (1 << 11); // TODO: TMP for devboard
+
     MXC_GPIO1->ps |= 0xFFFFFFFF;
     MXC_GPIO1->pad_cfg1 |= 0xFFFFFFFF;
     MXC_GPIO1->pad_cfg2 &= ~(0xFFFFFFFF);
diff --git a/sdk/Libraries/MAX32665PeriphDriver/Source/mxc_pins.c b/sdk/Libraries/MAX32665PeriphDriver/Source/mxc_pins.c
index 1837074fa5883cbb1f74c38e73200bb16da5da5c..64ebd02a4d720f063f2cfbcccc5fd8b3deb4a1ad 100644
--- a/sdk/Libraries/MAX32665PeriphDriver/Source/mxc_pins.c
+++ b/sdk/Libraries/MAX32665PeriphDriver/Source/mxc_pins.c
@@ -71,7 +71,8 @@ const gpio_cfg_t gpio_cfg_i2c0 =   { PORT_0, (PIN_6 | PIN_7), GPIO_FUNC_ALT1, GP
 const gpio_cfg_t gpio_cfg_i2c1 =   { PORT_0, (PIN_14 | PIN_15), GPIO_FUNC_ALT1, GPIO_PAD_NONE };
 const gpio_cfg_t gpio_cfg_i2c2 =   { PORT_1, (PIN_14 | PIN_15), GPIO_FUNC_ALT1, GPIO_PAD_NONE };
 
-const gpio_cfg_t gpio_cfg_spi17y0a =     { PORT_1, (PIN_9 | PIN_10 | PIN_11 | PIN_12 | PIN_13), GPIO_FUNC_ALT1, GPIO_PAD_NONE };
+//const gpio_cfg_t gpio_cfg_spi17y0a =     { PORT_1, (PIN_9 | PIN_10 | PIN_11 | PIN_12 | PIN_13), GPIO_FUNC_ALT1, GPIO_PAD_NONE }; // TODO: move out of SDK
+const gpio_cfg_t gpio_cfg_spi17y0a =     { PORT_1, (PIN_9 | PIN_10 | PIN_11), GPIO_FUNC_ALT1, GPIO_PAD_NONE };
 const gpio_cfg_t gpio_cfg_spi17y0b =     { PORT_0, (PIN_9 | PIN_10 | PIN_11 | PIN_12 | PIN_13), GPIO_FUNC_ALT2, GPIO_PAD_NONE };
 const gpio_cfg_t gpio_cfg_spi17y0_ss0a = { PORT_1, (PIN_8), GPIO_FUNC_ALT1, GPIO_PAD_NONE };
 const gpio_cfg_t gpio_cfg_spi17y0_ss0b = { PORT_0, (PIN_8), GPIO_FUNC_ALT2, GPIO_PAD_NONE };