Diff: mbed_spi.c

Revision:

0:814475fdc553

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed_spi.c	Tue Jul 05 07:19:59 2016 +0000
@@ -0,0 +1,103 @@
+
+#include <stdio.h>
+#include "spi_api.h"
+#include "gpio_api.h"
+
+#ifdef TARGET_MCU_NRF51822
+#include "nrf51.h"
+static PinName mbed_spi_mosi;
+static PinName mbed_spi_miso;
+static PinName mbed_spi_sclk;
+static PinName mbed_spi_cs;
+static uint32_t mbed_spi_mosi_cnf;
+static uint32_t mbed_spi_miso_cnf;
+static uint32_t mbed_spi_sclk_cnf;
+static uint32_t mbed_spi_cs_cnf;
+#endif
+
+static spi_t mbed_spi_object;
+static gpio_t mbed_cs_object;
+
+
+
+void mbed_spi_init(PinName mosi, PinName miso, PinName sclk, PinName cs)
+{
+    spi_init(&mbed_spi_object, mosi, miso, sclk, NC);
+    spi_format(&mbed_spi_object, 8, 0, 0);
+    spi_frequency(&mbed_spi_object, 1000000);
+
+    gpio_init_out(&mbed_cs_object, cs);
+    gpio_write(&mbed_cs_object, 1);
+
+#ifdef TARGET_MCU_NRF51822
+    mbed_spi_mosi = mosi;
+    mbed_spi_miso = miso;
+    mbed_spi_sclk = sclk;
+    mbed_spi_cs   = cs;
+    
+    mbed_spi_mosi_cnf = NRF_GPIO->PIN_CNF[mosi];
+    mbed_spi_miso_cnf = NRF_GPIO->PIN_CNF[miso];
+    mbed_spi_sclk_cnf = NRF_GPIO->PIN_CNF[sclk];
+    mbed_spi_cs_cnf = NRF_GPIO->PIN_CNF[cs];
+#endif
+}
+
+int mbed_spi_write(unsigned char reg_addr,
+                   unsigned char length,
+                   unsigned char const *data)
+{
+    int i;
+
+    gpio_write(&mbed_cs_object, 0);
+    spi_master_write(&mbed_spi_object, reg_addr);
+    for (i = 0; i < length; i++) {
+        spi_master_write(&mbed_spi_object, data[i]);
+    }
+    gpio_write(&mbed_cs_object, 1);
+    return 0;
+}
+
+int mbed_spi_read(unsigned char reg_addr,
+                  unsigned char length,
+                  unsigned char *data)
+{
+    int i;
+
+    gpio_write(&mbed_cs_object, 0);
+    spi_master_write(&mbed_spi_object, reg_addr | 0x80);
+    for (i = 0; i < length; i++) {
+        data[i] = spi_master_write(&mbed_spi_object, 0xff);
+    }
+
+    gpio_write(&mbed_cs_object, 1);
+    return 0;
+}
+
+void mbed_spi_enable(void)
+{
+#if defined(TARGET_MCU_NRF51822) && !defined(DEBUG)
+    // NRF_GPIO->PIN_CNF[mbed_spi_mosi] = mbed_spi_mosi_cnf;
+    // NRF_GPIO->PIN_CNF[mbed_spi_miso] = mbed_spi_miso_cnf;
+    // NRF_GPIO->PIN_CNF[mbed_spi_sclk] = mbed_spi_sclk_cnf;
+    // NRF_GPIO->PIN_CNF[mbed_spi_cs] = mbed_spi_cs_cnf;
+    
+    mbed_spi_object.spi->ENABLE = 1;
+#endif
+}
+
+void mbed_spi_disable(void)
+{
+#if defined(TARGET_MCU_NRF51822) && !defined(DEBUG)
+    mbed_spi_mosi_cnf = NRF_GPIO->PIN_CNF[mbed_spi_mosi];
+    mbed_spi_miso_cnf = NRF_GPIO->PIN_CNF[mbed_spi_miso];
+    mbed_spi_sclk_cnf = NRF_GPIO->PIN_CNF[mbed_spi_sclk];
+    mbed_spi_cs_cnf = NRF_GPIO->PIN_CNF[mbed_spi_cs];
+    
+    mbed_spi_object.spi->ENABLE = 0;
+    
+    // NRF_GPIO->PIN_CNF[mbed_spi_mosi] = 2;
+    // NRF_GPIO->PIN_CNF[mbed_spi_miso] = 2;
+    // NRF_GPIO->PIN_CNF[mbed_spi_sclk] = 2;
+    // NRF_GPIO->PIN_CNF[mbed_spi_cs] = 2;
+#endif
+}