n, h and l actually are 6-bit; they go from 1 to 64.

pull/249/head
Jeroen Domburg 2017-01-11 14:13:37 +08:00
rodzic a98d07d650
commit daa2b7cbc9
1 zmienionych plików z 2 dodań i 2 usunięć

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@ -396,7 +396,7 @@ static int spi_freq_for_pre_n(int fapb, int pre, int n) {
static void spi_set_clock(spi_dev_t *hw, int fapb, int hz, int duty_cycle) {
int pre, n, h, l;
//In hw, n, h and l are 1-32, pre is 1-8K. Value written to register is one lower than used value.
//In hw, n, h and l are 1-64, pre is 1-8K. Value written to register is one lower than used value.
if (hz>((fapb/4)*3)) {
//Using Fapb directly will give us the best result here.
hw->clock.clkcnt_l=0;
@ -414,7 +414,7 @@ static void spi_set_clock(spi_dev_t *hw, int fapb, int hz, int duty_cycle) {
int bestpre=-1;
int besterr=hz;
int errval;
for (n=1; n<33; n++) {
for (n=1; n<=64; n++) {
//Effectively, this does pre=round((fapb/n)/hz).
pre=((fapb/n)+(hz/2))/hz;
if (pre<0) pre=0;