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128
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1 import time
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2 from devices import Device, registerDevice, STLinkException, Interface
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3
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4 # F4 specifics:
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5 STM32_FLASH_BASE = 0x08000000
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6 STM32_SRAM_BASE = 0x20000000
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7
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8 FLASH_KEY1 = 0x45670123
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9 FLASH_KEY2 = 0xcdef89ab
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10
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11 # flash registers:
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12 FLASH_F4_REGS_ADDR = 0x40023c00
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13 FLASH_F4_KEYR = FLASH_F4_REGS_ADDR + 0x04
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14 FLASH_F4_SR = FLASH_F4_REGS_ADDR + 0x0c
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15 FLASH_F4_CR = FLASH_F4_REGS_ADDR + 0x10
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16
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17 FLASH_F4_CR_START = 16
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18 FLASH_F4_CR_LOCK = 31
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19 FLASH_CR_PG = 0
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20 FLASH_F4_CR_SER = 1
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21 FLASH_CR_MER = 2
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22 FLASH_F4_CR_SNB = 3
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23 FLASH_F4_CR_SNB_MASK = 0x38
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24 FLASH_F4_SR_BSY = 16
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25
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26 def calculate_F4_sector(address):
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27 """
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28 from 0x8000000 to 0x80FFFFF
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29 4 sectors of 0x4000 (16 kB)
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30 1 sector of 0x10000 (64 kB)
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31 7 of 0x20000 (128 kB)
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32 """
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33 sectorsizes = [0x4000] * 4 + [0x10000] + [0x20000] * 7
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34 sectorstarts = []
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35 a = STM32_FLASH_BASE
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36 for sectorsize in sectorsizes:
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37 sectorstarts.append(a)
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38 a += sectorsize
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39 # linear search:
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40 sec = 0
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41 while sec < len(sectorsizes) and address >= sectorstarts[sec]:
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42 sec += 1
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43 sec -= 1 # one back.
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44 return sec, sectorsizes[sec]
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45
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46 def calcSectors(address, size):
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47 off = 0
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48 sectors = []
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49 while off < size:
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50 sectornum, sectorsize = calculate_F4_sector(address + off)
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51 sectors.append((sectornum, sectorsize))
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52 off += sectorsize
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53 return sectors
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54
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55 @registerDevice(0x10016413)
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56 class Stm32F4(Device):
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57 def __init__(self, iface):
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129
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58 super().__init__(iface)
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59 def __str__(self):
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60 return 'STM32F4 device'
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128
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61 # flashing commands:
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62 def writeFlash(self, address, content):
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63 # TODO:
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64 flashsize = 0x100000 # fixed 1 MB for now..
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65 print('WARNING: using 1 MB as flash size')
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66 pagesize = 0x4000 # fixed for now!
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67 print('warning: page size hardcoded')
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68
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69 # Check address range:
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70 if address < STM32_FLASH_BASE:
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71 raise STLinkException('Flashing below flash start')
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72 if address + len(content) > STM32_FLASH_BASE + flashsize:
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73 raise STLinkException('Flashing above flash size')
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74 if address & 1 == 1:
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75 raise STLinkException('Unaligned flash')
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76 if len(content) & 1 == 1:
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77 print('unaligned length, padding with zero')
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78 content += bytes([0])
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79 if address & (pagesize - 1) != 0:
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80 raise STLinkException('Address not aligned with pagesize')
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81
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82 # erase required space
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83 sectors = calcSectors(address, len(content))
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84 print('erasing {0} sectors'.format(len(sectors)))
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85 for sector, secsize in sectors:
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86 print('erasing sector {0} of {1} bytes'.format(sector, secsize))
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87 self.eraseFlashSector(sector)
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88
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89 # program pages:
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90 self.unlockFlashIf()
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91 self.writeFlashCrPsiz(2) # writes are 32 bits aligned
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92 self.setFlashCrPg()
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93
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94 print('writing {0} bytes'.format(len(content)), end='')
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95 offset = 0
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96 t1 = time.time()
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97 while offset < len(content):
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98 size = len(content) - offset
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99 if size > 0x8000:
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100 size = 0x8000
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101
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102 chunk = content[offset:offset + size]
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103 while len(chunk) % 4 != 0:
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104 print('padding chunk')
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105 chunk = chunk + bytes([0])
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106
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107 # Use simple mem32 writes:
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108 self.iface.write_mem32(address + offset, chunk)
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109
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110 offset += size
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111 print('.', end='', flush=True)
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112 t2 = time.time()
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113 print('Done!')
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114 print('Speed: {0} bytes/second'.format(len(content)/(t2-t1)))
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115
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116 self.lockFlash()
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117
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118 # verfify program:
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119 self.verifyFlash(address, content)
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120 def eraseFlashSector(self, sector):
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121 self.waitFlashBusy()
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122 self.unlockFlashIf()
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123 self.writeFlashCrSnb(sector)
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124 self.setFlashCrStart()
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125 self.waitFlashBusy()
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126 self.lockFlash()
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127 def eraseFlash(self):
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128 self.waitFlashBusy()
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129 self.unlockFlashIf()
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130 self.setFlashCrMer()
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131 self.setFlashCrStart()
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132 self.waitFlashBusy()
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133 self.clearFlashCrMer()
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134 self.lockFlash()
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135 def verifyFlash(self, address, content):
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136 device_content = self.readFlash(address, len(content))
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137 ok = content == device_content
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138 print('Verify:', ok)
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139 def readFlash(self, address, size):
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140 print('Reading {1} bytes from 0x{0:X}'.format(address, size), end='')
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141 offset = 0
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142 tmp_size = 0x1800
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143 t1 = time.time()
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144 image = bytes()
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145 while offset < size:
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146 # Correct for last page:
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147 if offset + tmp_size > size:
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148 tmp_size = size - offset
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149
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150 # align size to 4 bytes:
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151 aligned_size = tmp_size
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152 while aligned_size % 4 != 0:
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153 aligned_size += 1
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154
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155 mem = self.iface.read_mem32(address + offset, aligned_size)
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156 image += mem[:tmp_size]
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157
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158 # indicate progress:
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159 print('.', end='', flush=True)
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160
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161 # increase for next piece:
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162 offset += tmp_size
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163 t2 = time.time()
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164 assert size == len(image)
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165 print('Done!')
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166 print('Speed: {0} bytes/second'.format(size/(t2-t1)))
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167 return image
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168
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169 def waitFlashBusy(self):
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170 """ block until flash operation completes. """
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171 while self.isFlashBusy():
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172 pass
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173 def isFlashLocked(self):
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174 cr = self.readFlashCr()
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175 mask = 1 << FLASH_F4_CR_LOCK
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176 return cr & mask == mask
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177 def unlockFlashIf(self):
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178 if self.isFlashLocked():
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179 self.iface.write_debug32(FLASH_F4_KEYR, FLASH_KEY1)
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180 self.iface.write_debug32(FLASH_F4_KEYR, FLASH_KEY2)
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181 if self.isFlashLocked():
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182 raise STLinkException('Failed to unlock')
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183 def lockFlash(self):
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184 x = self.readFlashCr() | (1 << FLASH_F4_CR_LOCK)
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185 self.writeFlashCr(x)
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186
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187 def readFlashSr(self):
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188 return self.iface.read_debug32(FLASH_F4_SR)
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189 def readFlashCr(self):
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190 return self.iface.read_debug32(FLASH_F4_CR)
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191 def writeFlashCr(self, x):
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192 self.iface.write_debug32(FLASH_F4_CR, x)
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193 def writeFlashCrSnb(self, sector):
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194 x = self.readFlashCr()
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195 x &= ~FLASH_F4_CR_SNB_MASK
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196 x |= sector << FLASH_F4_CR_SNB
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197 x |= 1 << FLASH_F4_CR_SER
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198 self.writeFlashCr(x)
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199 def setFlashCrMer(self):
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200 x = self.readFlashCr()
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201 x |= 1 << FLASH_CR_MER
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202 self.writeFlashCr(x)
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203 def setFlashCrPg(self):
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204 x = self.readFlashCr()
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205 x |= 1 << FLASH_CR_PG
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206 self.writeFlashCr(x)
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207 def writeFlashCrPsiz(self, n):
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208 x = self.readFlashCr()
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209 x &= (0x3 << 8)
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210 x |= n << 8
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211 self.writeFlashCr(x)
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212 def clearFlashCrMer(self):
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213 x = self.readFlashCr()
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214 x &= ~(1 << FLASH_CR_MER)
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215 self.writeFlashCr(x)
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216 def setFlashCrStart(self):
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217 x = self.readFlashCr()
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218 x |= 1 << FLASH_F4_CR_START
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219 self.writeFlashCr(x)
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220 def isFlashBusy(self):
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221 mask = 1 << FLASH_F4_SR_BSY
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222 sr = self.readFlashSr()
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223 # Check for error bits:
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224 errorbits = {}
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225 errorbits[7] = 'Programming sequence error'
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226 errorbits[6] = 'Programming parallelism error'
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227 errorbits[5] = 'Programming alignment error'
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228 errorbits[4] = 'Write protection error'
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229 errorbits[1] = 'Operation error'
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230 #errorbits[0] = 'End of operation'
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231 for bit, msg in errorbits.items():
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232 if sr & (1 << bit) == (1 << bit):
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233 raise STLinkException(msg)
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234 return sr & mask == mask
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235
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