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SPI Flash AT45DB080D (Atmel) see: http://mbed.org/users/okini3939/notebook/extend-memory/
main.cpp
- Committer:
- okini3939
- Date:
- 2012-11-26
- Revision:
- 0:54f4cc3dfc0e
File content as of revision 0:54f4cc3dfc0e:
/* * SPI FLASH AT45DB081D (Atmel) * 8Mbit */ #include "mbed.h" #include "at45db161d.h" #undef PAGE_SIZE #define PAGE_SIZE 264 // AT45DB081D (1MB) //#define PAGE_SIZE 528 // AT45DB321D (4MB) #define PAGE_NUM 4095 // AT45DB081D (1MB) //#define PAGE_NUM 8192 // AT45DB321D (4MB) #define WRITE_BUFFER 1 #define READ_BUFFER 2 DigitalOut myled(LED1); Serial pc(USBTX, USBRX); SPI spi(p11, p12, p13); // mosi, miso, sclk ATD45DB161D memory(spi, p19); void flash_write (int addr, char *buf, int len) { int i; memory.BufferWrite(WRITE_BUFFER, addr % PAGE_SIZE); for (i = 0; i < len; i ++) { spi.write(buf[i]); } memory.BufferToPage(WRITE_BUFFER, addr / PAGE_SIZE, 1); } void flash_read (int addr, char *buf, int len) { int i; memory.PageToBuffer(addr / PAGE_SIZE, READ_BUFFER); memory.BufferRead(READ_BUFFER, addr % PAGE_SIZE, 1); for (i = 0; i < len; i ++) { buf[i] = spi.write(0xff); } } int main() { int i; char buf[PAGE_SIZE]; Timer t; ATD45DB161D::ID id; pc.baud(115200); spi.frequency(16000000); wait_ms(500); memory.ReadManufacturerAndDeviceID(&id); printf("RAM Manufacturer ID : %02x\r\n", id.manufacturer); printf("RAM Device ID : %02x %02x\r\n", id.device[0], id.device[1]); wait_ms(10); printf("\r\nHELLO test\r\n"); printf("RAM write\r\n"); strcpy(buf, "Hello!"); flash_write(0, buf, 6); for (i = 0; i < PAGE_SIZE; i ++) { buf[i] = i; } flash_write(6, buf, PAGE_SIZE - 6); wait(1); memset(buf, 0, PAGE_SIZE); printf("RAM read\r\n"); flash_read(0, buf, PAGE_SIZE); for (i = 0; i < PAGE_SIZE; i ++) { printf(" %02x", buf[i]); if ((i & 0x0f) == 0x0f) printf("\r\n"); } wait(1); printf("\r\nWrite/Read time\r\n"); printf("RAM write\r\n"); t.reset(); t.start(); for (i = 0; i < 0x20000; i += PAGE_SIZE) { buf[0] = (i >> 8) & 0xff; flash_write(i, buf, PAGE_SIZE); if ((i & 0x0fff) == 0) printf("."); } t.stop(); printf("\r\ntime %f, %f KBytes/sec\r\n", t.read(), (float)0x20000 / 1024 / t.read()); wait(1); printf("RAM read\r\n"); t.reset(); t.start(); for (i = 0; i < 0x20000; i += PAGE_SIZE) { flash_read(i, buf, PAGE_SIZE); if (buf[0] != ((i >> 8) & 0xff)) { printf("error %d\r\n", i); break; } if ((i & 0x0fff) == 0) printf("."); } t.stop(); printf("\r\ntime %f, %f KBytes/sec\r\n", t.read(), 0x20000 / 1024 / t.read()); }