Diff: main.cpp

Revision:

0:20b32d13a758

Child:

1:bdf8b378dbc9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Apr 16 10:54:15 2017 +0000
@@ -0,0 +1,230 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+Serial pc(USBTX, USBRX);
+
+#if defined(TARGET_LPC1768)
+SPI _spi(p5, p6, p7); // mosi, miso, sclk
+DigitalOut _cs(p8);
+#elif defined(TARGET_LPC1114)
+SPI _spi(dp2, dp1, dp6); // mosi, miso, sclk
+DigitalOut _cs(dp9);
+#else // Arduino R3 Shield form factor
+SPI _spi(D11, D12, D13); // mosi, miso, sclk
+DigitalOut _cs(D10);
+#endif
+
+#define MB85_WREN   0x06
+#define MB85_WRDI   0x04
+#define MB85_RDSR   0x05
+#define MB85_WRSR   0x01
+#define MB85_READ   0x03
+#define MB85_WRITE  0x02
+#define MB85_RDID   0x9F
+#define MB85_FSTRD  0x0B
+#define MB85_SLEEP  0xB9
+
+#define MB85_DENSITY_64K    0x3
+#define MB85_DENSITY_256K   0x5
+#define MB85_DENSITY_512K   0x6
+#define MB85_DENSITY_1M     0x7
+#define MB85_DENSITY_2M     0x8
+
+static int _address_bits = 0;
+
+int read_device_id(uint8_t* device_id)
+{
+    _cs = 0;
+    _spi.write(MB85_RDID);
+    for (int i = 0; i < 4; i++) {
+        *device_id++ = (uint8_t)_spi.write(0);
+    }
+    _cs = 1;
+    
+    return 0;
+}
+
+uint8_t read_status()
+{
+    _cs = 0;
+    _spi.write(MB85_RDSR);
+    uint8_t st = (uint8_t)_spi.write(0);
+    _cs = 1;
+    
+    return st;
+}
+
+int read(uint32_t address, uint8_t* data, uint32_t len)
+{
+    _cs = 0;
+    
+    _spi.write(MB85_READ);
+    if (_address_bits == 24) {
+        _spi.write((uint8_t)((address >> 16) & 0xFF));
+    }
+    _spi.write((uint8_t)((address >>  8) & 0xFF));
+    _spi.write((uint8_t)((address >>  0) & 0xFF));
+    for (uint32_t i = 0; i < len; i++) {
+        *data++ = (uint8_t)_spi.write(0);
+    }
+    _cs = 1;
+    
+    return 0;
+}
+
+uint8_t read(uint32_t address)
+{
+    uint8_t data;
+    _cs = 0;
+    _spi.write(MB85_READ);
+    if (_address_bits == 24) {
+        _spi.write((uint8_t)((address >> 16) & 0xFF));
+    }
+    _spi.write((uint8_t)((address >>  8) & 0xFF));
+    _spi.write((uint8_t)((address >>  0) & 0xFF));
+    data = (uint8_t)_spi.write(0);
+    _cs = 1;
+    
+    return data;
+}
+
+int write(uint32_t address, uint8_t* data, uint32_t len)
+{
+    _cs = 0;
+    _spi.write(MB85_WRITE);
+    if (_address_bits == 24) {
+        _spi.write((uint8_t)((address >> 16) & 0xFF));
+    }
+    _spi.write((uint8_t)((address >>  8) & 0xFF));
+    _spi.write((uint8_t)((address >>  0) & 0xFF));
+    for (uint32_t i = 0; i < len; i++) {
+        _spi.write(*data++);
+    }
+    _cs = 1;
+    
+    return 0;
+}
+
+int write(uint32_t address, uint8_t data)
+{
+    _cs = 0;
+    _spi.write(MB85_WRITE);
+    if (_address_bits == 24) {
+        _spi.write((uint8_t)((address >> 16) & 0xFF));
+    }
+    _spi.write((uint8_t)((address >>  8) & 0xFF));
+    _spi.write((uint8_t)((address >>  0) & 0xFF));
+    _spi.write(data);
+    _cs = 1;
+    
+    return 0;
+}
+
+int fill(uint32_t address, uint8_t data, uint32_t len)
+{
+    _cs = 0;
+    _spi.write(MB85_WRITE);
+    if (_address_bits == 24) {
+        _spi.write((uint8_t)((address >> 16) & 0xFF));
+    }
+    _spi.write((uint8_t)((address >>  8) & 0xFF));
+    _spi.write((uint8_t)((address >>  0) & 0xFF));
+    for (uint32_t i = 0; i < len; i++) {
+        _spi.write(data);
+    }
+    _cs = 1;
+    
+    return 0;
+}
+
+void write_enable()
+{
+    _cs = 0;
+    _spi.write(MB85_WREN);
+    _cs = 1;
+}
+
+void write_disable()
+{
+    _cs = 0;
+    _spi.write(MB85_WRDI);
+    _cs = 1;
+}
+
+int main() {
+    uint8_t buf[16];
+    uint32_t address;
+
+    pc.baud(115200);
+    pc.printf("\nFujitsu MB85RSxxx FRAM test program\n\n");
+    
+    // Initialize SPI
+    _spi.format(8, 0);
+    _cs = 1;
+
+    // Read device ID and detect memory density for addressing    
+    read_device_id(buf);
+    if ((buf[2] & 0x1F) > MB85_DENSITY_512K) {
+        _address_bits = 24;
+    } else {
+        _address_bits = 16;
+    }
+    pc.printf("read device ID = 0x%x 0x%x 0x%x 0x%x\n", buf[0], buf[1], buf[2], buf[3]);
+    write_enable();
+    pc.printf("read status (WREN) = 0x%x\n", read_status());
+    write_disable();
+    pc.printf("read status (WRDI) = 0x%x\n", read_status());
+    
+    // Write 0 data
+    write_enable();
+    fill(0, 0, 256);
+
+    // Prepare write data
+    for (int i = 0; i < 16; i++) {
+        buf[i] = i;
+    }
+    
+    // Write data with write enable
+    write_enable();
+    write(0x00, buf, 16);
+    
+    // Attempt to write data (not written)
+    write(0x10, buf, 16);
+    
+    // Write data with write enable
+    write_enable();
+    write(0x20, buf, 16);
+    
+    // Read data
+    for (address = 0; address < 0x80; address += 16) {
+        read(address, buf, 16);
+        pc.printf("%08X : ", address);
+        for (int i = 0; i < 16; i++) {
+            pc.printf("%02X ", buf[i]);    
+        }
+        pc.printf("\n");
+    }
+
+    // Write number from 0 to 255
+    pc.printf("\n");
+    for (address = 0; address < 0x100; address++) {
+        write_enable();
+        write(address, (uint8_t)address);
+    }
+    // Read data
+    for (address = 0; address < 0x100; address += 16) {
+        read(address, buf, 16);
+        pc.printf("%08X : ", address);
+        for (int i = 0; i < 16; i++) {
+            pc.printf("%02X ", buf[i]);    
+        }
+        pc.printf("\n");
+    }
+
+    while(1) {
+        myled = 1;
+        wait(0.2);
+        myled = 0;
+        wait(0.2);
+    }
+}