Mercurial > ~darius > hgwebdir.cgi > stm32temp

annotate delay.c @ 24:1e2fa7396f98

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Reduce prescaler to 2, the flash is capable of 25MHz reads (although the touch screen is limited to ~2.5MHz)
author Daniel O'Connor <darius@dons.net.au>
date Sat, 17 Nov 2012 12:17:58 +1030
parents 891841f5f785
children a38003b97de6
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8
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1 #include <stdint.h>
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2 #include "stm32f10x.h"
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3 #include "delay.h"
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4
14
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5 /* Sleep for nCount usec
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6 * TDS1012 on 2.5usec/div shows...
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7 * 30usec = 29.60usec
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8 * 60usec = 59.20usec
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9 *
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10 * XXX: not sure disable IRQ stuff is working as I see occasional (small) extra delays
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11 */
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12 void
14
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13 delay(uint32_t nCount) {
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14 __disable_irq();
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15 for(; nCount != 0; nCount--) {
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16 #ifdef SYSCLK_FREQ_72MHz
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17 __asm__("nop");
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18 __asm__("nop");
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19 __asm__("nop");
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20 __asm__("nop");
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21 __asm__("nop");
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22 __asm__("nop");
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23 __asm__("nop");
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24 __asm__("nop");
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25
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26 __asm__("nop");
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27 __asm__("nop");
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28 __asm__("nop");
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29 __asm__("nop");
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30 __asm__("nop");
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31 __asm__("nop");
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32 __asm__("nop");
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33 __asm__("nop");
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34
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35 __asm__("nop");
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36 __asm__("nop");
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37 __asm__("nop");
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38 __asm__("nop");
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39 __asm__("nop");
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40 __asm__("nop");
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41 __asm__("nop");
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42 __asm__("nop");
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43
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44 __asm__("nop");
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45 __asm__("nop");
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46 __asm__("nop");
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47 __asm__("nop");
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48 __asm__("nop");
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49 __asm__("nop");
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50 __asm__("nop");
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51
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52 __asm__("nop");
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53 __asm__("nop");
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54 __asm__("nop");
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55 __asm__("nop");
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56 __asm__("nop");
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57 __asm__("nop");
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58 __asm__("nop");
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59 __asm__("nop");
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60
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61 __asm__("nop");
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62 __asm__("nop");
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63 __asm__("nop");
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64 __asm__("nop");
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65 __asm__("nop");
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66 __asm__("nop");
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67 __asm__("nop");
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68
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69 __asm__("nop");
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70 __asm__("nop");
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71 __asm__("nop");
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72 __asm__("nop");
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73 __asm__("nop");
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74 __asm__("nop");
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75 __asm__("nop");
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76 __asm__("nop");
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77 #else
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78 #error Unknown clock frequency
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79 #endif
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80 }
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81 __enable_irq();
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82 }
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83