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SPIRAM_23LC1024_DMA
SPI RAM 23LC1024 (Microchip) with DMA
Fork of SPIRAM_23LC1024 by
main.cpp@0:c5ba7d914282, 2012-11-09 (annotated)
- Committer:
- okini3939
- Date:
- Fri Nov 09 00:32:20 2012 +0000
- Revision:
- 0:c5ba7d914282
- Child:
- 1:a7b1803dfa44
1st build
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 | 0:c5ba7d914282 | 3 | */ |
okini3939 | 0:c5ba7d914282 | 4 | #include "mbed.h" |
okini3939 | 0:c5ba7d914282 | 5 | |
okini3939 | 0:c5ba7d914282 | 6 | #define CMD_READ 0x03 |
okini3939 | 0:c5ba7d914282 | 7 | #define CMD_WRITE 0x02 |
okini3939 | 0:c5ba7d914282 | 8 | #define CMD_RDMR 0x05 |
okini3939 | 0:c5ba7d914282 | 9 | #define CMD_WRMR 0x01 |
okini3939 | 0:c5ba7d914282 | 10 | |
okini3939 | 0:c5ba7d914282 | 11 | DigitalOut myled(LED1); |
okini3939 | 0:c5ba7d914282 | 12 | Serial pc(USBTX, USBRX); |
okini3939 | 0:c5ba7d914282 | 13 | |
okini3939 | 0:c5ba7d914282 | 14 | SPI spi(p11, p12, p13); // mosi, miso, sclk |
okini3939 | 0:c5ba7d914282 | 15 | DigitalOut cs(p17); |
okini3939 | 0:c5ba7d914282 | 16 | |
okini3939 | 0:c5ba7d914282 | 17 | int ram_write (int addr, char *buf, int len) { |
okini3939 | 0:c5ba7d914282 | 18 | int i; |
okini3939 | 0:c5ba7d914282 | 19 | |
okini3939 | 0:c5ba7d914282 | 20 | cs = 0; |
okini3939 | 0:c5ba7d914282 | 21 | spi.write(CMD_WRITE); |
okini3939 | 0:c5ba7d914282 | 22 | spi.write((addr >> 16) & 0xff); |
okini3939 | 0:c5ba7d914282 | 23 | spi.write((addr >> 8) & 0xff); |
okini3939 | 0:c5ba7d914282 | 24 | spi.write(addr & 0xff); |
okini3939 | 0:c5ba7d914282 | 25 | |
okini3939 | 0:c5ba7d914282 | 26 | for (i = 0; i < len; i ++) { |
okini3939 | 0:c5ba7d914282 | 27 | spi.write(buf[i]); |
okini3939 | 0:c5ba7d914282 | 28 | } |
okini3939 | 0:c5ba7d914282 | 29 | cs = 1; |
okini3939 | 0:c5ba7d914282 | 30 | return i; |
okini3939 | 0:c5ba7d914282 | 31 | } |
okini3939 | 0:c5ba7d914282 | 32 | |
okini3939 | 0:c5ba7d914282 | 33 | int ram_read (int addr, char *buf, int len) { |
okini3939 | 0:c5ba7d914282 | 34 | int i; |
okini3939 | 0:c5ba7d914282 | 35 | |
okini3939 | 0:c5ba7d914282 | 36 | cs = 0; |
okini3939 | 0:c5ba7d914282 | 37 | spi.write(CMD_READ); |
okini3939 | 0:c5ba7d914282 | 38 | spi.write((addr >> 16) & 0xff); |
okini3939 | 0:c5ba7d914282 | 39 | spi.write((addr >> 8) & 0xff); |
okini3939 | 0:c5ba7d914282 | 40 | spi.write(addr & 0xff); |
okini3939 | 0:c5ba7d914282 | 41 | |
okini3939 | 0:c5ba7d914282 | 42 | for (i = 0; i < len; i ++) { |
okini3939 | 0:c5ba7d914282 | 43 | buf[i] = spi.write(0); |
okini3939 | 0:c5ba7d914282 | 44 | } |
okini3939 | 0:c5ba7d914282 | 45 | cs = 1; |
okini3939 | 0:c5ba7d914282 | 46 | return i; |
okini3939 | 0:c5ba7d914282 | 47 | } |
okini3939 | 0:c5ba7d914282 | 48 | |
okini3939 | 0:c5ba7d914282 | 49 | int main() { |
okini3939 | 0:c5ba7d914282 | 50 | int i; |
okini3939 | 0:c5ba7d914282 | 51 | char buf[256]; |
okini3939 | 0:c5ba7d914282 | 52 | |
okini3939 | 0:c5ba7d914282 | 53 | cs = 1; |
okini3939 | 0:c5ba7d914282 | 54 | pc.baud(115200); |
okini3939 | 0:c5ba7d914282 | 55 | wait_ms(500); |
okini3939 | 0:c5ba7d914282 | 56 | |
okini3939 | 0:c5ba7d914282 | 57 | cs = 0; |
okini3939 | 0:c5ba7d914282 | 58 | spi.write(CMD_RDMR); |
okini3939 | 0:c5ba7d914282 | 59 | printf("RAM mode: %02x\r\n", spi.write(0)); |
okini3939 | 0:c5ba7d914282 | 60 | cs = 1; |
okini3939 | 0:c5ba7d914282 | 61 | |
okini3939 | 0:c5ba7d914282 | 62 | printf("RAM write\r\n"); |
okini3939 | 0:c5ba7d914282 | 63 | strcpy(buf, "Hello!"); |
okini3939 | 0:c5ba7d914282 | 64 | ram_write(0, buf, 6); |
okini3939 | 0:c5ba7d914282 | 65 | |
okini3939 | 0:c5ba7d914282 | 66 | for (i = 0; i < 256; i ++) { |
okini3939 | 0:c5ba7d914282 | 67 | buf[i] = i; |
okini3939 | 0:c5ba7d914282 | 68 | } |
okini3939 | 0:c5ba7d914282 | 69 | ram_write(6, buf, 256); |
okini3939 | 0:c5ba7d914282 | 70 | |
okini3939 | 0:c5ba7d914282 | 71 | wait_ms(500); |
okini3939 | 0:c5ba7d914282 | 72 | memset(buf, 0, 256); |
okini3939 | 0:c5ba7d914282 | 73 | |
okini3939 | 0:c5ba7d914282 | 74 | printf("RAM read\r\n"); |
okini3939 | 0:c5ba7d914282 | 75 | ram_read(0, buf, 256); |
okini3939 | 0:c5ba7d914282 | 76 | for (i = 0; i < 256; i ++) { |
okini3939 | 0:c5ba7d914282 | 77 | printf(" %02x", buf[i]); |
okini3939 | 0:c5ba7d914282 | 78 | if ((i & 0x0f) == 0x0f) |
okini3939 | 0:c5ba7d914282 | 79 | printf("\r\n"); |
okini3939 | 0:c5ba7d914282 | 80 | } |
okini3939 | 0:c5ba7d914282 | 81 | |
okini3939 | 0:c5ba7d914282 | 82 | while(1) { |
okini3939 | 0:c5ba7d914282 | 83 | myled = 1; |
okini3939 | 0:c5ba7d914282 | 84 | wait(0.2); |
okini3939 | 0:c5ba7d914282 | 85 | myled = 0; |
okini3939 | 0:c5ba7d914282 | 86 | wait(0.2); |
okini3939 | 0:c5ba7d914282 | 87 | } |
okini3939 | 0:c5ba7d914282 | 88 | } |