From 69ed847740e3efb5c5ff6319629c93d236150959 Mon Sep 17 00:00:00 2001
From: Uros Majstorovic <majstor@majstor.org>
Date: Fri, 23 Sep 2022 20:08:02 +0200
Subject: i2s driver fixed; added uart programming;

---
 fw/fe310/eos/soc/spi.c | 54 ++++++++++++++++++++++++++++++--------------------
 1 file changed, 32 insertions(+), 22 deletions(-)

(limited to 'fw/fe310/eos/soc/spi.c')

diff --git a/fw/fe310/eos/soc/spi.c b/fw/fe310/eos/soc/spi.c
index b722c7e..351c9c8 100644
--- a/fw/fe310/eos/soc/spi.c
+++ b/fw/fe310/eos/soc/spi.c
@@ -57,10 +57,11 @@ int eos_spi_init(uint8_t wakeup_cause) {
     eos_intr_set_priority(INT_SPI1_BASE, IRQ_PRIORITY_SPI_XCHG);
 
     SPI1_REG(SPI_REG_SCKMODE) = SPI_MODE0;
-    SPI1_REG(SPI_REG_FMT) = SPI_FMT_PROTO(SPI_PROTO_S) |
-      SPI_FMT_ENDIAN(SPI_ENDIAN_MSB) |
-      SPI_FMT_DIR(SPI_DIR_RX) |
-      SPI_FMT_LEN(8);
+    SPI1_REG(SPI_REG_FMT) = \
+        SPI_FMT_PROTO(SPI_PROTO_S)      |
+        SPI_FMT_ENDIAN(SPI_ENDIAN_MSB)  |
+        SPI_FMT_DIR(SPI_DIR_RX)         |
+        SPI_FMT_LEN(8);
 
     /* for spi 9bit protocol */
     GPIO_REG(GPIO_OUTPUT_EN)    |=  (1 << IOF_SPI1_SCK);
@@ -69,8 +70,6 @@ int eos_spi_init(uint8_t wakeup_cause) {
 
     eos_spi_enable();
 
-    // There is no way here to change the CS polarity.
-    // SPI1_REG(SPI_REG_CSDEF) = 0xFFFF;
     return EOS_OK;
 }
 
@@ -117,7 +116,6 @@ void eos_spi_set_handler(unsigned char evt, eos_evt_handler_t handler) {
     if (evt && (evt <= EOS_SPI_MAX_EVT)) evt_handler[evt - 1] = handler;
 }
 
-__attribute__ ((section (".itim")))
 void _eos_spi_xchg_init(unsigned char *buffer, uint16_t len, uint8_t flags) {
     spi_state_flags &= 0xF0;
     spi_state_flags |= (SPI_FLAG_XCHG | flags);
@@ -127,7 +125,7 @@ void _eos_spi_xchg_init(unsigned char *buffer, uint16_t len, uint8_t flags) {
     spi_state_idx_rx = 0;
 }
 
-static void spi_xchg_finish(void) {
+static void spi_wait4xchg(void) {
     uint8_t done = 0;
 
     while (!done) {
@@ -140,7 +138,7 @@ static void spi_xchg_finish(void) {
 }
 
 void eos_spi_xchg(unsigned char *buffer, uint16_t len, uint8_t flags) {
-    if (spi_in_xchg) spi_xchg_finish();
+    if (spi_in_xchg) spi_wait4xchg();
 
     spi_in_xchg = 1;
     _eos_spi_xchg_init(buffer, len, flags);
@@ -150,7 +148,6 @@ void eos_spi_xchg(unsigned char *buffer, uint16_t len, uint8_t flags) {
     SPI1_REG(SPI_REG_IE) = SPI_IP_TXWM;
 }
 
-__attribute__ ((section (".itim")))
 void eos_spi_handle_xchg(void) {
     int i;
     uint16_t sz_chunk = MIN(spi_state_len - spi_state_idx_tx, SPI_SIZE_CHUNK);
@@ -162,15 +159,21 @@ void eos_spi_handle_xchg(void) {
     }
     spi_state_idx_tx += i;
 
-    for (i=0; i<spi_state_idx_tx - spi_state_idx_rx; i++) {
-        volatile uint32_t x = SPI1_REG(SPI_REG_RXFIFO);
-        if (x & SPI_RXFIFO_EMPTY) break;
-        spi_state_buf[spi_state_idx_rx+i] = x & 0xFF;
+    if (!(spi_state_flags & EOS_SPI_FLAG_TX)) {
+        for (i=0; i<spi_state_idx_tx - spi_state_idx_rx; i++) {
+            volatile uint32_t x = SPI1_REG(SPI_REG_RXFIFO);
+            if (x & SPI_RXFIFO_EMPTY) break;
+            spi_state_buf[spi_state_idx_rx+i] = x & 0xFF;
+        }
+        spi_state_idx_rx += i;
     }
-    spi_state_idx_rx += i;
 
     if (spi_state_idx_tx == spi_state_len) {
-        if ((spi_state_idx_rx == spi_state_len) || (spi_state_flags & EOS_SPI_FLAG_TX)) {
+        if ((spi_state_flags & EOS_SPI_FLAG_TX) || (spi_state_idx_rx == spi_state_len)) {
+            if ((spi_state_flags & EOS_SPI_FLAG_TX) && (SPI1_REG(SPI_REG_TXCTRL) != SPI_TXWM(1))) {
+                SPI1_REG(SPI_REG_TXCTRL) = SPI_TXWM(1);
+                return;
+            }
             spi_state_flags &= ~SPI_FLAG_XCHG;
             if (!(spi_state_flags & EOS_SPI_FLAG_MORE)) eos_spi_cs_clear();
             SPI1_REG(SPI_REG_IE) = 0x0;
@@ -182,7 +185,6 @@ void eos_spi_handle_xchg(void) {
     }
 }
 
-__attribute__ ((section (".itim")))
 void eos_spi_cs_set(void) {
 	/* cs low */
     if (SPI1_REG(SPI_REG_CSMODE) == SPI_CSMODE_OFF) {
@@ -192,7 +194,6 @@ void eos_spi_cs_set(void) {
     }
 }
 
-__attribute__ ((section (".itim")))
 void eos_spi_cs_clear(void) {
 	/* cs high */
     if (SPI1_REG(SPI_REG_CSMODE) == SPI_CSMODE_OFF) {
@@ -355,12 +356,21 @@ uint32_t eos_spi_xchg32(uint32_t data, uint8_t flags) {
 }
 
 void eos_spi_flush(void) {
-    volatile uint32_t x = 0;
+    if (spi_in_xchg) {
+        spi_wait4xchg();
+    } else {
+        SPI1_REG(SPI_REG_TXCTRL) = SPI_TXWM(1);
+        while (!(SPI1_REG(SPI_REG_IP) & SPI_IP_TXWM));
+        while (!(SPI1_REG(SPI_REG_RXFIFO) & SPI_RXFIFO_EMPTY));
+    }
 
-    if (spi_in_xchg) spi_xchg_finish();
+    /*
+    volatile uint32_t x = 0;
 
-    SPI1_REG(SPI_REG_TXCTRL) = SPI_TXWM(1);
     while (!x) {
-        if (SPI1_REG(SPI_REG_IP) & SPI_IP_TXWM) x = SPI1_REG(SPI_REG_RXFIFO) & SPI_RXFIFO_EMPTY;
+        if (SPI1_REG(SPI_REG_IP) & SPI_IP_TXWM) {
+            x = SPI1_REG(SPI_REG_RXFIFO) & SPI_RXFIFO_EMPTY;
+        }
     }
+    */
 }
-- 
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