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SPIRAM_23LC1024
SPI RAM 23LC1024 (Microchip) 1Mbit see: http://mbed.org/users/okini3939/notebook/extend-memory/
main.cpp@1:a7b1803dfa44, 2012-11-09 (annotated)
- Committer:
- okini3939
- Date:
- Fri Nov 09 06:23:54 2012 +0000
- Revision:
- 1:a7b1803dfa44
- Parent:
- 0:c5ba7d914282
fix
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
okini3939 | 0:c5ba7d914282 | 1 | /* |
okini3939 | 0:c5ba7d914282 | 2 | * SPI RAM 23LC1024 (Microchip) |
okini3939 | 1:a7b1803dfa44 | 3 | * 1Mbit |
okini3939 | 0:c5ba7d914282 | 4 | */ |
okini3939 | 0:c5ba7d914282 | 5 | #include "mbed.h" |
okini3939 | 0:c5ba7d914282 | 6 | |
okini3939 | 0:c5ba7d914282 | 7 | #define CMD_READ 0x03 |
okini3939 | 0:c5ba7d914282 | 8 | #define CMD_WRITE 0x02 |
okini3939 | 0:c5ba7d914282 | 9 | #define CMD_RDMR 0x05 |
okini3939 | 0:c5ba7d914282 | 10 | #define CMD_WRMR 0x01 |
okini3939 | 0:c5ba7d914282 | 11 | |
okini3939 | 0:c5ba7d914282 | 12 | DigitalOut myled(LED1); |
okini3939 | 0:c5ba7d914282 | 13 | Serial pc(USBTX, USBRX); |
okini3939 | 0:c5ba7d914282 | 14 | |
okini3939 | 0:c5ba7d914282 | 15 | SPI spi(p11, p12, p13); // mosi, miso, sclk |
okini3939 | 1:a7b1803dfa44 | 16 | DigitalOut cs(p17), hold(p18); |
okini3939 | 0:c5ba7d914282 | 17 | |
okini3939 | 0:c5ba7d914282 | 18 | int ram_write (int addr, char *buf, int len) { |
okini3939 | 0:c5ba7d914282 | 19 | int i; |
okini3939 | 0:c5ba7d914282 | 20 | |
okini3939 | 0:c5ba7d914282 | 21 | cs = 0; |
okini3939 | 0:c5ba7d914282 | 22 | spi.write(CMD_WRITE); |
okini3939 | 0:c5ba7d914282 | 23 | spi.write((addr >> 16) & 0xff); |
okini3939 | 0:c5ba7d914282 | 24 | spi.write((addr >> 8) & 0xff); |
okini3939 | 0:c5ba7d914282 | 25 | spi.write(addr & 0xff); |
okini3939 | 0:c5ba7d914282 | 26 | |
okini3939 | 0:c5ba7d914282 | 27 | for (i = 0; i < len; i ++) { |
okini3939 | 0:c5ba7d914282 | 28 | spi.write(buf[i]); |
okini3939 | 0:c5ba7d914282 | 29 | } |
okini3939 | 0:c5ba7d914282 | 30 | cs = 1; |
okini3939 | 0:c5ba7d914282 | 31 | return i; |
okini3939 | 0:c5ba7d914282 | 32 | } |
okini3939 | 0:c5ba7d914282 | 33 | |
okini3939 | 0:c5ba7d914282 | 34 | int ram_read (int addr, char *buf, int len) { |
okini3939 | 0:c5ba7d914282 | 35 | int i; |
okini3939 | 0:c5ba7d914282 | 36 | |
okini3939 | 0:c5ba7d914282 | 37 | cs = 0; |
okini3939 | 0:c5ba7d914282 | 38 | spi.write(CMD_READ); |
okini3939 | 0:c5ba7d914282 | 39 | spi.write((addr >> 16) & 0xff); |
okini3939 | 0:c5ba7d914282 | 40 | spi.write((addr >> 8) & 0xff); |
okini3939 | 0:c5ba7d914282 | 41 | spi.write(addr & 0xff); |
okini3939 | 0:c5ba7d914282 | 42 | |
okini3939 | 0:c5ba7d914282 | 43 | for (i = 0; i < len; i ++) { |
okini3939 | 0:c5ba7d914282 | 44 | buf[i] = spi.write(0); |
okini3939 | 0:c5ba7d914282 | 45 | } |
okini3939 | 0:c5ba7d914282 | 46 | cs = 1; |
okini3939 | 0:c5ba7d914282 | 47 | return i; |
okini3939 | 0:c5ba7d914282 | 48 | } |
okini3939 | 0:c5ba7d914282 | 49 | |
okini3939 | 0:c5ba7d914282 | 50 | int main() { |
okini3939 | 0:c5ba7d914282 | 51 | int i; |
okini3939 | 0:c5ba7d914282 | 52 | char buf[256]; |
okini3939 | 1:a7b1803dfa44 | 53 | Timer t; |
okini3939 | 0:c5ba7d914282 | 54 | |
okini3939 | 0:c5ba7d914282 | 55 | cs = 1; |
okini3939 | 1:a7b1803dfa44 | 56 | hold = 1; |
okini3939 | 0:c5ba7d914282 | 57 | pc.baud(115200); |
okini3939 | 1:a7b1803dfa44 | 58 | spi.frequency(16000000); |
okini3939 | 0:c5ba7d914282 | 59 | wait_ms(500); |
okini3939 | 0:c5ba7d914282 | 60 | |
okini3939 | 0:c5ba7d914282 | 61 | cs = 0; |
okini3939 | 0:c5ba7d914282 | 62 | spi.write(CMD_RDMR); |
okini3939 | 0:c5ba7d914282 | 63 | printf("RAM mode: %02x\r\n", spi.write(0)); |
okini3939 | 0:c5ba7d914282 | 64 | cs = 1; |
okini3939 | 0:c5ba7d914282 | 65 | |
okini3939 | 1:a7b1803dfa44 | 66 | printf("\r\nHELLO test\r\n"); |
okini3939 | 1:a7b1803dfa44 | 67 | |
okini3939 | 0:c5ba7d914282 | 68 | printf("RAM write\r\n"); |
okini3939 | 0:c5ba7d914282 | 69 | strcpy(buf, "Hello!"); |
okini3939 | 0:c5ba7d914282 | 70 | ram_write(0, buf, 6); |
okini3939 | 0:c5ba7d914282 | 71 | |
okini3939 | 0:c5ba7d914282 | 72 | for (i = 0; i < 256; i ++) { |
okini3939 | 0:c5ba7d914282 | 73 | buf[i] = i; |
okini3939 | 0:c5ba7d914282 | 74 | } |
okini3939 | 0:c5ba7d914282 | 75 | ram_write(6, buf, 256); |
okini3939 | 0:c5ba7d914282 | 76 | |
okini3939 | 1:a7b1803dfa44 | 77 | wait(1); |
okini3939 | 0:c5ba7d914282 | 78 | memset(buf, 0, 256); |
okini3939 | 0:c5ba7d914282 | 79 | |
okini3939 | 0:c5ba7d914282 | 80 | printf("RAM read\r\n"); |
okini3939 | 0:c5ba7d914282 | 81 | ram_read(0, buf, 256); |
okini3939 | 0:c5ba7d914282 | 82 | for (i = 0; i < 256; i ++) { |
okini3939 | 0:c5ba7d914282 | 83 | printf(" %02x", buf[i]); |
okini3939 | 0:c5ba7d914282 | 84 | if ((i & 0x0f) == 0x0f) |
okini3939 | 0:c5ba7d914282 | 85 | printf("\r\n"); |
okini3939 | 0:c5ba7d914282 | 86 | } |
okini3939 | 0:c5ba7d914282 | 87 | |
okini3939 | 1:a7b1803dfa44 | 88 | wait(1); |
okini3939 | 1:a7b1803dfa44 | 89 | |
okini3939 | 1:a7b1803dfa44 | 90 | printf("\r\nWrite/Read time\r\n"); |
okini3939 | 1:a7b1803dfa44 | 91 | |
okini3939 | 1:a7b1803dfa44 | 92 | printf("RAM write\r\n"); |
okini3939 | 1:a7b1803dfa44 | 93 | t.reset(); |
okini3939 | 1:a7b1803dfa44 | 94 | t.start(); |
okini3939 | 1:a7b1803dfa44 | 95 | for (i = 0; i < 0x20000; i += 256) { |
okini3939 | 1:a7b1803dfa44 | 96 | buf[0] = (i >> 8) & 0xff; |
okini3939 | 1:a7b1803dfa44 | 97 | ram_write(i, buf, 256); |
okini3939 | 1:a7b1803dfa44 | 98 | if ((i & 0x0fff) == 0) printf("."); |
okini3939 | 0:c5ba7d914282 | 99 | } |
okini3939 | 1:a7b1803dfa44 | 100 | t.stop(); |
okini3939 | 1:a7b1803dfa44 | 101 | printf("\r\ntime %f, %f KBytes/sec\r\n", t.read(), (float)0x20000 / 1024 / t.read()); |
okini3939 | 1:a7b1803dfa44 | 102 | |
okini3939 | 1:a7b1803dfa44 | 103 | wait(1); |
okini3939 | 1:a7b1803dfa44 | 104 | |
okini3939 | 1:a7b1803dfa44 | 105 | printf("RAM read\r\n"); |
okini3939 | 1:a7b1803dfa44 | 106 | t.reset(); |
okini3939 | 1:a7b1803dfa44 | 107 | t.start(); |
okini3939 | 1:a7b1803dfa44 | 108 | for (i = 0; i < 0x20000; i += 256) { |
okini3939 | 1:a7b1803dfa44 | 109 | ram_read(i, buf, 256); |
okini3939 | 1:a7b1803dfa44 | 110 | if (buf[0] != ((i >> 8) & 0xff)) { |
okini3939 | 1:a7b1803dfa44 | 111 | printf("error %d\r\n", i); |
okini3939 | 1:a7b1803dfa44 | 112 | break; |
okini3939 | 1:a7b1803dfa44 | 113 | } |
okini3939 | 1:a7b1803dfa44 | 114 | if ((i & 0x0fff) == 0) printf("."); |
okini3939 | 1:a7b1803dfa44 | 115 | } |
okini3939 | 1:a7b1803dfa44 | 116 | t.stop(); |
okini3939 | 1:a7b1803dfa44 | 117 | printf("\r\ntime %f, %f KBytes/sec\r\n", t.read(), 0x20000 / 1024 / t.read()); |
okini3939 | 1:a7b1803dfa44 | 118 | |
okini3939 | 0:c5ba7d914282 | 119 | } |