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annotate gsm-fw/bsp/clkm.c @ 305:4dccc9d3305f

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gsm-fw: checking in DAR from Leonardo source
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 16 Mar 2014 05:48:58 +0000
parents afceeeb2cba1
children
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1 /******************************************************************************
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2 TEXAS INSTRUMENTS INCORPORATED PROPRIETARY INFORMATION
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3
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4 Property of Texas Instruments -- For Unrestricted Internal Use Only
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5 Unauthorized reproduction and/or distribution is strictly prohibited. This
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6 product is protected under copyright law and trade secret law as an
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7 unpublished work. Created 1987, (C) Copyright 1997 Texas Instruments. All
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8 rights reserved.
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9
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10
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11 Filename : clkm.c
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12
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13 Description : Set of functions useful to test the Saturn
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14 CLKM peripheral
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15
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16 Project : drivers
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17
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18 Author : pmonteil@tif.ti.com Patrice Monteil.
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19
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20 Version number : 1.11
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21
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22 Date and time : 10/23/01 14:43:31
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23
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24 Previous delta : 10/23/01 14:43:31
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25
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26 SCCS file : /db/gsm_asp/db_ht96/dsp_0/gsw/rel_0/mcu_l1/release_gprs/mod/emu_p/EMU_P_FRED_CLOCK/drivers1/common/SCCS/s.clkm.c
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27
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28 Sccs Id (SID) : '@(#) clkm.c 1.11 10/23/01 14:43:31 '
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29
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30
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31
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32 *****************************************************************************/
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33
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34 //############################################################
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35 //############################################################
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36 //### Be careful: this file must be placed in Flash Memory ###
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37 //### and compiled in 16 bits length intructions ###
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38 //### (CF. the function wait_ARM_cycles() ###
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39 //############################################################
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40 //############################################################
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41
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42 #include "../include/config.h"
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43 #include "../include/sys_types.h"
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44
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45 #include "mem.h"
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46 #include "clkm.h"
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47
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48 static SYS_UWORD32 ratio_wait_loop = 0;
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49
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50 #if (CHIPSET == 12)
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51 const double dsp_div_value[CLKM_NB_DSP_DIV_VALUE] = {1, 1.5, 2, 3};
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52 #endif
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53
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54 #if ((CHIPSET == 4) || (CHIPSET == 7) || (CHIPSET == 8) || (CHIPSET == 10) || (CHIPSET == 11) || (CHIPSET == 12))
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55 /*---------------------------------------------------------------/
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56 /* CLKM_InitARMClock() */
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57 /*--------------------------------------------------------------*/
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58 /* Parameters : clk_src : 0x00 means DPLL selected */
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59 /* 0x01 means VTCX0 selected */
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60 /* 0x03 means CLKIN selected */
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61 /* clk_xp5 : Enable 1.5 or 2.5 division factor */
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62 /* (0 or 1) */
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63 /* clk_div : Division factor applied to clock */
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64 /* source */
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65 /* WARNING : reverse order in comparison to ULYSSE */
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66 /* */
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67 /* Return : none */
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68 /* Functionality :Initialize the ARM Clock frequency */
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69 /*--------------------------------------------------------------*/
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70
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71 void CLKM_InitARMClock(SYS_UWORD16 clk_src, SYS_UWORD16 clk_div, SYS_UWORD16 clk_xp5)
93
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72 {
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73 SYS_UWORD16 cntl = * (volatile SYS_UWORD16 *) CLKM_ARM_CLK;
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74
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75 cntl &= ~(CLKM_CLKIN0 | CLKM_CLKIN_SEL | CLKM_ARM_MCLK_XP5 | CLKM_MCLK_DIV);
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76
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77 cntl |= ((clk_src << 1) | (clk_xp5 << 3) | (clk_div << 4));
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78
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79 * (volatile SYS_UWORD16 *) CLKM_ARM_CLK = cntl;
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80 }
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81 #else
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82 /*---------------------------------------------------------------/
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83 /* CLKM_InitARMClock() */
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84 /*--------------------------------------------------------------*/
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85 /* Parameters : clk_src : 0x00 means CLKIN selected */
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86 /* 0x01 means 32 K selected */
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87 /* 0x02 means External clock selected */
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88 /* */
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89 /* Return : none */
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90 /* Functionality :Initialize the ARM Clock frequency */
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91 /*--------------------------------------------------------------*/
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92
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93 void CLKM_InitARMClock(SYS_UWORD16 clk_src, SYS_UWORD16 clk_div)
93
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94 {
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95 SYS_UWORD16 cntl = * (volatile SYS_UWORD16 *) CLKM_ARM_CLK;
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96
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97 cntl &= ~(CLKM_LOW_FRQ | CLKM_CLKIN_SEL | CLKM_MCLK_DIV);
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98
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99 cntl |= ((clk_src << 1) | (clk_div << 4));
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100
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101 * (volatile SYS_UWORD16 *) CLKM_ARM_CLK = cntl;
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102 }
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103
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104 #endif
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105
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106
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107 /*-------------------------------------------------------*/
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108 /* convert_nanosec_to_cycles() */
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109 /*-------------------------------------------------------*/
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110 /* parameter: time in 10E-9 seconds */
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111 /* return: Number of cycles for the wait_ARM_cycles() */
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112 /* function */
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113 /* */
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114 /* Description: */
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115 /* ------------ */
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116 /* convert x nanoseconds in y cycles used by the ASM loop*/
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117 /* function . Before calling this function, call the */
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118 /* initialize_wait_loop() function */
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119 /* Called when the HardWare needs time to wait */
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120 /*-------------------------------------------------------*/
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121 SYS_UWORD32 convert_nanosec_to_cycles(SYS_UWORD32 time)
93
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122 {
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123 return( time / ratio_wait_loop);
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124 }
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125
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126
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127 /*-------------------------------------------------------*/
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128 /* initialize_wait_loop() */
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129 /*-------------------------------------------------------*/
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130 /* */
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131 /* Description: */
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132 /* ------------ */
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parents:
diff changeset
133 /* Init the ratio used to convert time->Cycles according */
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parents:
diff changeset
134 /* to hardware parameters */
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
135 /* measurement time for this function (ARM 39Mhz, 3 waits*/
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
136 /* states) = 75 micoseconds */
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
137 /*-------------------------------------------------------*/
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parents:
diff changeset
138
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
139 void initialize_wait_loop(void)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
140 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
141 #define NBR_CYCLES_IN_LOOP 5 // this value is got from an oscilloscope measurement
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
142
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
143 double src_ratio;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
144 double final_ratio;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
145
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
146 SYS_UWORD16 flash_access_size;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
147 SYS_UWORD16 flash_wait_state;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
148 SYS_UWORD32 nbr;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
149 SYS_UWORD32 arm_clock;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
150
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
151 //////////////////////////////////
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
152 // compute the ARM clock used //
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
153 //////////////////////////////////
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
154 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
155 SYS_UWORD16 arm_mclk_xp5;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
156 SYS_UWORD16 arm_ratio;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
157 SYS_UWORD16 clk_src;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
158 SYS_UWORD16 clkm_cntl_arm_clk_reg = * (volatile SYS_UWORD16 *) CLKM_CNTL_ARM_CLK;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
159
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
160 #if ((CHIPSET == 4) || (CHIPSET == 7) || (CHIPSET == 8) || (CHIPSET == 10) || (CHIPSET == 11) || (CHIPSET == 12))
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
161 clk_src = (clkm_cntl_arm_clk_reg & MASK_CLKIN) >> 1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
162 switch (clk_src)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
163 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
164 case 0x00: //DPLL selected
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
165 // select the DPLL factor
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
166 if (((* (volatile SYS_UWORD16 *) MEM_DPLL_ADDR) & DPLL_LOCK) != 0)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
167 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
168 SYS_UWORD16 dpll_div;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
169 SYS_UWORD16 dpll_mul;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
170
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
171 dpll_div=DPLL_READ_DPLL_DIV;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
172 dpll_mul=DPLL_READ_DPLL_MUL;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
173 src_ratio = (double)(dpll_mul)/(double)(dpll_div+1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
174 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
175 else // DPLL in bypass mode
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
176 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
177 SYS_UWORD16 dpll_div = DPLL_BYPASS_DIV;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
178 src_ratio= (double)(1)/(double)(dpll_div+1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
179 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
180 break;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
181 case 0x01: //VTCX0 selected
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
182 src_ratio = 1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
183 break;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
184 case 0x03: //CLKIN selected (external clock)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
185 src_ratio = 1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
186 break;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
187 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
188 // define the division factor applied to clock source (CLKIN or VTCXO or DPLL)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
189 arm_ratio = (clkm_cntl_arm_clk_reg & CLKM_MCLK_DIV) >> 4;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
190
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
191 // check if the 1.5 or 2.5 division factor is enabled
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
192 arm_mclk_xp5 = clkm_cntl_arm_clk_reg & CLKM_ARM_MCLK_XP5;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
193
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
194 if (arm_mclk_xp5 == 0) // division factor enable for ARM clock ?
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
195 {
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
196 if (arm_ratio == 0)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
197 arm_ratio =1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
198 }
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
199 else
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
200 arm_ratio = ((arm_ratio>>1) & 0x0001) == 0 ? 1.5 : 2.5;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
201
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
202
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
203 #else // CHIPSET
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
204 src_ratio = 1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
205
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
206 // define the division factor applied to clock source (CLKIN or VTCXO or DPLL)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
207 arm_ratio = (clkm_cntl_arm_clk_reg & CLKM_MCLK_DIV) >> 4;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
208
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
209 // check if the 1.5 or 2.5 division factor is enabled
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
210 arm_mclk_xp5 = clkm_cntl_arm_clk_reg & MASK_ARM_MCLK_1P5;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
211
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
212 if (arm_mclk_xp5 == 1) // division factor enable for ARM clock ?
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
213 arm_ratio = 1.5;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
214 else
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
215 {
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
216 if (arm_ratio == 0)
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
217 arm_ratio = 4;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
218 else
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
219 if (arm_ratio == 1 )
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
220 arm_ratio = 2;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
221 else
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
222 arm_ratio = 1;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
223 }
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
224
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
225 #endif // CHIPSET
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
226
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
227 final_ratio = (src_ratio / (double) arm_ratio);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
228
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
229 }
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
230 //////////////////////////////////////////
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
231 // compute the Flash wait states used //
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
232 //////////////////////////////////////////
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
233
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
234 #if (CHIPSET == 12)
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
235 flash_access_size = *((volatile SYS_UWORD16 *) MEM_REG_nCS5);
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
236 #else
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
237 flash_access_size = *((volatile SYS_UWORD16 *) MEM_REG_nCS0);
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
238 #endif
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
239 flash_access_size = (flash_access_size >> 5) & 0x0003; // 0=>8bits, 1=>16 bits, 2 =>32 bits
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
240
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
241 // the loop file is compiled in 16 bits it means
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
242 // flash 8 bits => 2 loads for 1 16 bits assembler instruction
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
243 // flash 16 bits => 1 loads for 1 16 bits assembler instruction
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
244 // flash 32 bits => 1 loads for 1 16 bits assembler instruction (ARM bus 16 bits !!)
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
245
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
246 // !!!!!!!!! be careful: if this file is compile in 32 bits, change these 2 lines here after !!!
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
247 if (flash_access_size == 0) flash_access_size = 2;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
248 else flash_access_size = 1;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
249
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
250 #if (CHIPSET == 12)
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
251 /*
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
252 * WARNING - New ARM Memory Interface features are not supported here below (Page Mode, extended WS, Dummy Cycle,...).
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
253 */
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
254 flash_wait_state = *((volatile SYS_UWORD16 *) MEM_REG_nCS5);
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
255 #else
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
256 flash_wait_state = *((volatile SYS_UWORD16 *) MEM_REG_nCS0);
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
257 #endif
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
258 flash_wait_state &= 0x001F;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
259
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
260 //////////////////////////////////////
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
261 // compute the length of the loop //
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
262 //////////////////////////////////////
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
263
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
264 // Number of flash cycles for the assembler loop
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
265 nbr = NBR_CYCLES_IN_LOOP;
45911ad957fd nuc-fw: beginning to integrate TI's BSP code
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266
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267 // Number of ARM cycles for the assembler loop
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268 nbr = nbr * (flash_wait_state + 1) * (flash_access_size);
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269
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270 // time for the assembler loop (unit nanoseconds: 10E-9)
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271 arm_clock = final_ratio * 13; // ARM clock in Mhz
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272 ratio_wait_loop = (SYS_UWORD32)((nbr*1000) / arm_clock);
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273 }
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274
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275
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276 /*-------------------------------------------------------*/
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277 /* wait_ARM_cycles() */
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278 /*-------------------------------------------------------*/
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279 /* */
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280 /* Description: */
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281 /* ------------ */
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282 /* Called when the HardWare needs time to wait. */
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283 /* this function wait x cycles and is used with the */
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284 /* convert_nanosec_to_cycles() & initialize_wait_loop() */
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285 /* */
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286 /* Exemple: wait 10 micro seconds: */
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287 /* initialize_wait_loop(); */
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288 /* wait_ARM_cycles(convert_nanosec_to_cycles(10000)) */
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289 /* */
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290 /* minimum time value with cpt_loop = 0 (estimated) */
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291 /* and C-SAMPLE / flash 6,5Mhz ~ 1,5 micro seconds */
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292 /* */
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293 /* */
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294 /* Be careful : in order to respect the rule about the */
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295 /* conversion "time => number of cylcles in this loop" */
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296 /* (Cf the functions: convert_nanosec_to_cycles() and */
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297 /* initialize_wait_loop() ) respect the following rules: */
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298 /* This function must be placed in Flash Memory and */
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299 /* compiled in 16 bits instructions length */
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300 /*-------------------------------------------------------*/
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301 void wait_ARM_cycles(SYS_UWORD32 cpt_loop)
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302 {
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303 // C code:
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304 // while (cpt_loop -- != 0);
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305
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306 asm(" CMP A1, #0");
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307 asm(" BEQ END_FUNCTION");
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308
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309 asm("LOOP_LINE: ");
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310 asm(" SUB A1, A1, #1");
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311 asm(" CMP A1, #0");
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312 asm(" BNE LOOP_LINE");
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313
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314 asm("END_FUNCTION: ");
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315 }