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/i2s.c | |
| parent | b623f680f6a7aa53de6a1d949d857b37f391c80d (diff) | |
pwm scaling for i2s sck line added
Diffstat (limited to 'code/fe310/eos/i2s.c')
| -rw-r--r-- | code/fe310/eos/i2s.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/code/fe310/eos/i2s.c b/code/fe310/eos/i2s.c index 3b1772c..47be820 100644 --- a/code/fe310/eos/i2s.c +++ b/code/fe310/eos/i2s.c @@ -10,7 +10,7 @@ #include "i2s.h" #include "i2s_def.h" -#define I2S_PWM_REG_CK PWM1_REG +#define I2S_PWM_REG_CK PWM0_REG #define I2S_PWM_REG_WS PWM2_REG #define EOS_ABUF_IDX_MASK(IDX, SIZE) ((IDX) & ((SIZE) - 1)) @@ -90,6 +90,7 @@ void eos_i2s_init(void) { unsigned long f = get_cpu_freq(); _eos_i2s_ck_period = 512; + uint32_t _ck_period_scaled = _eos_i2s_ck_period >> I2S_PWM_SCALE_CK; GPIO_REG(GPIO_INPUT_EN) &= ~(1 << I2S_PIN_LR); GPIO_REG(GPIO_OUTPUT_EN) |= (1 << I2S_PIN_LR); GPIO_REG(GPIO_OUTPUT_XOR) &= ~(1 << I2S_PIN_LR); @@ -110,15 +111,15 @@ void eos_i2s_init(void) { I2S_PWM_REG_CK(PWM_CFG) = 0; I2S_PWM_REG_CK(PWM_COUNT) = 0; - I2S_PWM_REG_CK(PWM_CMP0) = _eos_i2s_ck_period - 1; - I2S_PWM_REG_CK(PWM_CMP1) = I2S_PWM_REG_CK(PWM_CMP0) / 2; - I2S_PWM_REG_CK(PWM_CMP2) = I2S_PWM_REG_CK(PWM_CMP0) / 8; + I2S_PWM_REG_CK(PWM_CMP0) = _ck_period_scaled; + I2S_PWM_REG_CK(PWM_CMP1) = _ck_period_scaled / 2; + I2S_PWM_REG_CK(PWM_CMP2) = _ck_period_scaled / 4; I2S_PWM_REG_WS(PWM_CFG) = 0; I2S_PWM_REG_WS(PWM_COUNT) = 0; - I2S_PWM_REG_WS(PWM_CMP0) = _eos_i2s_ck_period * 64 - 1; - I2S_PWM_REG_WS(PWM_CMP1) = I2S_PWM_REG_WS(PWM_CMP0) / 2; - I2S_PWM_REG_WS(PWM_CMP2) = I2S_PWM_REG_WS(PWM_CMP0) - _eos_i2s_ck_period; + I2S_PWM_REG_WS(PWM_CMP0) = (_eos_i2s_ck_period + 1) * 64 - 1; + I2S_PWM_REG_WS(PWM_CMP1) = (_eos_i2s_ck_period + 1) * 32; + I2S_PWM_REG_WS(PWM_CMP2) = (_eos_i2s_ck_period + 1) * 62; eos_intr_set(I2S_IRQ_SD_ID, I2S_IRQ_SD_PRIORITY, NULL); eos_intr_set(I2S_IRQ_CK_ID, I2S_IRQ_CK_PRIORITY, NULL); @@ -147,7 +148,7 @@ void eos_i2s_start(void) { I2S_PWM_REG_CK(PWM_COUNT) = 0; I2S_PWM_REG_WS(PWM_COUNT) = 0; - I2S_PWM_REG_CK(PWM_CFG) = PWM_CFG_ENALWAYS | PWM_CFG_ZEROCMP; + I2S_PWM_REG_CK(PWM_CFG) = PWM_CFG_ENALWAYS | PWM_CFG_ZEROCMP | I2S_PWM_SCALE_CK; I2S_PWM_REG_WS(PWM_CFG) = PWM_CFG_ENALWAYS | PWM_CFG_ZEROCMP; GPIO_REG(GPIO_IOF_SEL) |= (1 << I2S_PIN_CK); |