Control of PWM duty cycle requires change of match value.

diff --git a/drivers/sctimers.c b/drivers/sctimers.c
index 976d515..672f034 100644 (file)
--- a/drivers/sctimers.c
+++ b/drivers/sctimers.c
@@ -135,8 +135,13 @@ int sctimer_get_counter_val(uint8_t timer_num, uint32_t* val)
 /* Change the match value of a single timer channel */
 int sctimer_set_match(uint8_t timer_num, uint8_t channel, uint32_t val)
 {
-       /* FIXME : To be done */
-       return 0;
+       struct lpc_sct_timer* sct = LPC_SCTIMER;
+
+       if ((timer_num != LPC_SCT) || (channel >= MAX_CHANNELS)) {
+               return -EINVAL;
+       }
+       sct->match_reload[ channel + 1 ] = val;
+       return sct->match[ channel + 1 ];
 }
 
 struct common_operations sct_ops = {
@@ -192,8 +197,6 @@ int sctimer_pwm_config(uint8_t timer_num, const struct lpc_timer_pwm_config* pwm
 
        /* Use a single state */
        sct->state_var = 0;
-       /* No need to reload, match registers will keep their values */
-       sct->config |= LPC_SCT_NORELOAD;
        /* All match/capture regs act as match registers */
        sct->mode = 0;
 
@@ -202,6 +205,7 @@ int sctimer_pwm_config(uint8_t timer_num, const struct lpc_timer_pwm_config* pwm
                uint32_t evt_ctrl = 0;
 
                sct->match[ i + 1 ] = pwm->match_values[i];
+               sct->match_reload[ i + 1 ] = pwm->match_values[i];
                /* Enable one event for state 0 for this match */
                sct->event[ i + 1 ].state = LPC_SCT_EVT_EN_STATE(0);
                /* Setup the event to happen on given match channel and control the requested output */
@@ -221,6 +225,7 @@ int sctimer_pwm_config(uint8_t timer_num, const struct lpc_timer_pwm_config* pwm
        /* Select the channel 0 as the timer limit value to generate the PWM period.
         * Use autolimit, but configure an event anyway as we want to toggle the outputs as well */
        sct->match[0] = pwm->period;
+       sct->match_reload[0] = pwm->period;
        sct->config |= LPC_SCT_AUTOLIMIT;
        sct->event[0].state = LPC_SCT_EVT_EN_STATE(0);
        sct->event[0].control = (LPC_SCT_MATCHSEL(0) | LPC_SCT_COMB_MODE_MATCH);