diff options
| author | Uros Majstorovic <majstor@majstor.org> | 2018-03-17 01:56:21 +0100 |
|---|---|---|
| committer | Uros Majstorovic <majstor@majstor.org> | 2018-03-17 01:56:21 +0100 |
| commit | 723b3db6942c8b3f51a819870df6e523008c2ed0 (patch) | |
| tree | 6053da05f47b4031745e7e69af051a4b658861d1 /code/fe310/eos/trap_entry.S | |
| parent | b623f680f6a7aa53de6a1d949d857b37f391c80d (diff) | |
pwm scaling for i2s sck line added
Diffstat (limited to 'code/fe310/eos/trap_entry.S')
| -rw-r--r-- | code/fe310/eos/trap_entry.S | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/code/fe310/eos/trap_entry.S b/code/fe310/eos/trap_entry.S index 0efac2c..fef7d27 100644 --- a/code/fe310/eos/trap_entry.S +++ b/code/fe310/eos/trap_entry.S @@ -32,7 +32,7 @@ #define INT_PWM1_BASE 44 #define INT_PWM2_BASE 48 -#define I2S_PWM_CTRL_ADDR_CK PWM1_CTRL_ADDR +#define I2S_PWM_CTRL_ADDR_CK PWM0_CTRL_ADDR #define I2S_PWM_CTRL_ADDR_WS PWM2_CTRL_ADDR #include "i2s_def.h" @@ -71,17 +71,19 @@ handler_sd: li x18, I2S_PWM_CTRL_ADDR_CK lw x8, PWM_COUNT(x18) lw x9, PWM_CMP2(x18) + srli x9, x9, I2S_PWM_SCALE_CK blt x8, x9, handler_sd_exit_ # read mic value -> x8 li x18, GPIO_CTRL_ADDR lw x8, GPIO_INPUT_VAL(x18) - # set bit as ws pwm counter/ck period - sd volume -> x9 + # set bit as ws pwm counter/(ck period + 1) - sd volume -> x9 li x18, I2S_PWM_CTRL_ADDR_WS lw x9, PWM_COUNT(x18) la x18, _eos_i2s_ck_period lw x19, 0(x18) + addi x19, x19, 1 divu x9, x9, x19 la x18, _eos_i2s_mic_volume lw x19, 0(x18) |