diff options
Diffstat (limited to 'bsp/drivers')
| -rw-r--r-- | bsp/drivers/fe300prci/fe300prci_driver.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/bsp/drivers/fe300prci/fe300prci_driver.c b/bsp/drivers/fe300prci/fe300prci_driver.c index 5fb2c27..2d9c52f 100644 --- a/bsp/drivers/fe300prci/fe300prci_driver.c +++ b/bsp/drivers/fe300prci/fe300prci_driver.c @@ -182,9 +182,9 @@ void PRCI_use_hfxosc(uint32_t finaldiv) uint32_t PRCI_set_hfrosctrim_for_f_cpu(uint32_t f_cpu, PRCI_freq_target target ) { - int hfrosctrim = 0; - int hfroscdiv = 4; - int prev_trim = 0; + uint32_t hfrosctrim = 0; + uint32_t hfroscdiv = 4; + uint32_t prev_trim = 0; // In this function we use PLL settings which // will give us a 32x multiplier from the output @@ -195,22 +195,23 @@ uint32_t PRCI_set_hfrosctrim_for_f_cpu(uint32_t f_cpu, PRCI_freq_target target ) // requested is something in the limit of the PLL. For // now that is up to the user. - uint32_t desired_hfrosc_freq = f_cpu / 32; + // This will undershoot for frequencies not divisible by 16. + uint32_t desired_hfrosc_freq = (f_cpu/ 16); PRCI_use_hfrosc(hfroscdiv, hfrosctrim); // Ignore the first run (for icache reasons) - uint32_t cpu_freq = PRCI_measure_mcycle_freq(1000, RTC_FREQ); + uint32_t cpu_freq = PRCI_measure_mcycle_freq(3000, RTC_FREQ); - cpu_freq = PRCI_measure_mcycle_freq(1000, RTC_FREQ); + cpu_freq = PRCI_measure_mcycle_freq(3000, RTC_FREQ); uint32_t prev_freq = cpu_freq; - while ((cpu_freq < desired_hfrosc_freq) && hfrosctrim < 0x1F){ + while ((cpu_freq < desired_hfrosc_freq) && (hfrosctrim < 0x1F)){ prev_trim = hfrosctrim; prev_freq = cpu_freq; hfrosctrim ++; PRCI_use_hfrosc(hfroscdiv, hfrosctrim); - cpu_freq = PRCI_measure_mcycle_freq(1000, RTC_FREQ); + cpu_freq = PRCI_measure_mcycle_freq(3000, RTC_FREQ); } // We couldn't go low enough @@ -232,17 +233,18 @@ uint32_t PRCI_set_hfrosctrim_for_f_cpu(uint32_t f_cpu, PRCI_freq_target target ) case(PRCI_FREQ_CLOSEST): if ((desired_hfrosc_freq - prev_freq) < (cpu_freq - desired_hfrosc_freq)) { PRCI_use_pll(0, 0, 1, 31, 1, 1, hfroscdiv, prev_trim); - cpu_freq = PRCI_measure_mcycle_freq(1000, RTC_FREQ); + } else { + PRCI_use_pll(0, 0, 1, 31, 1, 1, hfroscdiv, hfrosctrim); } break; case(PRCI_FREQ_UNDERSHOOT): PRCI_use_pll(0, 0, 1, 31, 1, 1, hfroscdiv, prev_trim); - cpu_freq = PRCI_measure_mcycle_freq(1000, RTC_FREQ); break; - //default: - // Do Nothing + default: + PRCI_use_pll(0, 0, 1, 31, 1, 1, hfroscdiv, hfrosctrim); } + cpu_freq = PRCI_measure_mcycle_freq(1000, RTC_FREQ); return cpu_freq; } |