diff options
Diffstat (limited to 'stmhal/boards/pllvalues.py')
| -rw-r--r-- | stmhal/boards/pllvalues.py | 77 |
1 files changed, 61 insertions, 16 deletions
diff --git a/stmhal/boards/pllvalues.py b/stmhal/boards/pllvalues.py index 183313f30..e930ae87d 100644 --- a/stmhal/boards/pllvalues.py +++ b/stmhal/boards/pllvalues.py @@ -67,14 +67,17 @@ def compute_pll2(hse, sys): # no valid values found return None -def verify_and_print_pll(hse, sys, pll): +def compute_derived(hse, pll): M, N, P, Q = pll - - # compute derived quantities vco_in = hse / M vco_out = hse * N / M pllck = hse / M * N / P pll48ck = hse / M * N / Q + return (vco_in, vco_out, pllck, pll48ck) + +def verify_pll(hse, pll): + M, N, P, Q = pll + vco_in, vco_out, pllck, pll48ck = compute_derived(hse, pll) # verify ints assert close_int(M) @@ -90,26 +93,68 @@ def verify_and_print_pll(hse, sys, pll): assert 1 <= vco_in <= 2 assert 192 <= vco_out <= 432 - # print out values - print(out_format % (sys, M, N, P, Q, vco_in, vco_out, pllck, pll48ck)) +def generate_c_table(hse, valid_plls): + valid_plls = valid_plls + [(16, (0, 0, 2, 0))] + if hse < 16: + valid_plls.append((hse, (1, 0, 2, 0))) + valid_plls.sort() + print("// (M, P/2-1, SYS) values for %u MHz HSE" % hse) + print("static const uint16_t pll_freq_table[%u] = {" % len(valid_plls)) + for sys, (M, N, P, Q) in valid_plls: + print(" (%u << 10) | (%u << 8) | %u," % (M, P // 2 - 1, sys)) + print("};") + +def print_table(hse, valid_plls): + print("HSE =", hse, "MHz") + print("sys : M N P Q : VCO_IN VCO_OUT PLLCK PLL48CK") + out_format = "%3u : %2u %.1f %.2f %.2f : %5.2f %6.2f %6.2f %6.2f" + for sys, pll in valid_plls: + print(out_format % ((sys,) + pll + compute_derived(hse, pll))) + print("found %u valid configurations" % len(valid_plls)) def main(): global out_format + + # parse input args import sys - if len(sys.argv) != 2: - print("usage: pllvalues.py <hse in MHz>") + argv = sys.argv[1:] + + c_table = False + if argv[0] == '-c': + c_table = True + argv.pop(0) + + if len(argv) != 1: + print("usage: pllvalues.py [-c] <hse in MHz>") sys.exit(1) - hse_value = int(sys.argv[1]) - print("HSE =", hse_value, "MHz") - print("sys : M N P Q : VCO_IN VCO_OUT PLLCK PLL48CK") - out_format = "%3u : %2u %.1f %.2f %.2f : %5.2f %6.2f %6.2f %6.2f" - n_valid = 0 + + if argv[0].startswith("file:"): + # extract HSE_VALUE from header file + with open(argv[0][5:]) as f: + for line in f: + line = line.strip() + if line.startswith("#define") and line.find("HSE_VALUE") != -1: + idx_start = line.find("((uint32_t)") + 11 + idx_end = line.find(")", idx_start) + hse = int(line[idx_start:idx_end]) // 1000000 + break + else: + raise ValueError("%s does not contain a definition of HSE_VALUE" % argv[0]) + else: + # HSE given directly as an integer + hse = int(argv[0]) + + valid_plls = [] for sysclk in range(1, 217): - pll = compute_pll2(hse_value, sysclk) + pll = compute_pll2(hse, sysclk) if pll is not None: - n_valid += 1 - verify_and_print_pll(hse_value, sysclk, pll) - print("found %u valid configurations" % n_valid) + verify_pll(hse, pll) + valid_plls.append((sysclk, pll)) + + if c_table: + generate_c_table(hse, valid_plls) + else: + print_table(hse, valid_plls) if __name__ == "__main__": main() |